simplify

Annotated lib/builtins.py

42:df3d2b28e2ae
2006-08-09 paulb Added tracing of the system state.
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#!/usr/bin/env python
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"""
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Simple built-in classes and functions.
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Copyright (C) 2005, 2006 Paul Boddie <paul@boddie.org.uk>
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This software is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This software is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public
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License along with this library; see the file LICENCE.txt
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If not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
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--------
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The docstring annotations have the following meanings:
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    NAME            Indicates a "stable" name used by callers of a function
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                    instead of a generated name which would distinguish
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                    different specialisations.
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    NATIVE          Means that the class or function body details are not
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                    accurate representations of the actual code and should not
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                    be generated by a compiler.
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    INTERCHANGEABLE Indicates that instances of a class are not sufficiently or
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                    meaningfully distinguishable from each other with regard to
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                    instantiation.
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    SPECIAL         Indicates that the compiler should try and optimise calls to
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                    the annotated function.
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    ATOMIC          Indicates that the class and its instance(s) cannot store
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                    attributes, although some may be predefined (such as the
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                    __true__ method).
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--------
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NATIVE
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"""
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class boolean:
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    """
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    NATIVE
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    INTERCHANGEABLE
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    """
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    def __true__(self):
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        return self
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    def __str__(self):
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        if self:
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            return "True"
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        else:
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            return "False"
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class int:
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    """
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    NATIVE
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    INTERCHANGEABLE
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    """
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    def __iadd__(self, other):
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        """
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        NAME: IMPL.builtins.int.__iadd__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return int()
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        else:
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            TypeConstraintError
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    def __isub__(self, other):
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        """
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        NAME: IMPL.builtins.int.__isub__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return int()
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        else:
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            TypeConstraintError
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    def __add__(self, other):
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        """
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        NAME: IMPL.builtins.int.__add__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return int()
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        else:
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            TypeConstraintError
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    def __radd__(self, other):
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        """
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        NAME: IMPL.builtins.int.__radd__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return int()
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        else:
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            TypeConstraintError
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    def __sub__(self, other):
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        """
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        NAME: IMPL.builtins.int.__sub__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return int()
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        else:
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            TypeConstraintError
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    def __rsub__(self, other):
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        """
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        NAME: IMPL.builtins.int.__rsub__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return int()
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        else:
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            TypeConstraintError
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    def __mul__(self, other):
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        """
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        NAME: IMPL.builtins.int.__mul__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return int()
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        else:
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            TypeConstraintError
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    def __rmul__(self, other):
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        """
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        NAME: IMPL.builtins.int.__rmul__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return int()
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        else:
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            TypeConstraintError
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    def __div__(self, other):
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        """
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        NAME: IMPL.builtins.int.__div__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return int()
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        else:
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            TypeConstraintError
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    def __rdiv__(self, other):
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        """
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        NAME: IMPL.builtins.int.__rdiv__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return int()
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        else:
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            TypeConstraintError
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    def __pow__(self, other):
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        """
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        NAME: IMPL.builtins.int.__pow__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return int()
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        else:
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            TypeConstraintError
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    def __lt__(self, other):
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        """
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        NAME: IMPL.builtins.int.__lt__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return boolean()
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        else:
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            TypeConstraintError
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    def __gt__(self, other):
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        """
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        NAME: IMPL.builtins.int.__gt__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return boolean()
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        else:
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            TypeConstraintError
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    def __le__(self, other):
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        """
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        NAME: IMPL.builtins.int.__le__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return boolean()
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        else:
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            TypeConstraintError
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    def __ge__(self, other):
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        """
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        NAME: IMPL.builtins.int.__ge__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return boolean()
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        else:
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            TypeConstraintError
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    def __eq__(self, other):
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        """
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        NAME: IMPL.builtins.int.__eq__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return boolean()
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        else:
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            TypeConstraintError
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    def __ne__(self, other):
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        """
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        NAME: IMPL.builtins.int.__ne__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return boolean()
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        else:
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            TypeConstraintError
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    def __neg__(self):
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        """
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        NAME: IMPL.builtins.int.__neg__
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        NATIVE
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        """
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        return int()
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    def __pos__(self):
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        return self
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    def __str__(self):
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        """
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        NAME: IMPL.builtins.int.__str__
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        NATIVE
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        """
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        return string()
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    def __true__(self):
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        return self != 0
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class long:
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    """
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    NATIVE
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    INTERCHANGEABLE
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    """
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    def __iadd__(self, other):
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        """
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        NAME: IMPL.builtins.long.__iadd__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return long()
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        elif isinstance(other, long):
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            return long()
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        else:
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            TypeConstraintError
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    def __isub__(self, other):
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        """
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        NAME: IMPL.builtins.long.__isub__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return long()
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        elif isinstance(other, long):
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            return long()
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        else:
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            TypeConstraintError
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    def __add__(self, other):
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        """
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        NAME: IMPL.builtins.long.__add__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return long()
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        elif isinstance(other, long):
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            return long()
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        else:
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            TypeConstraintError
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    def __radd__(self, other):
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        """
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        NAME: IMPL.builtins.long.__radd__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return long()
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        elif isinstance(other, long):
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            return long()
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        else:
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            TypeConstraintError
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    def __sub__(self, other):
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        """
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        NAME: IMPL.builtins.long.__sub__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return long()
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        elif isinstance(other, long):
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            return long()
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        else:
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            TypeConstraintError
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    def __rsub__(self, other):
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        """
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        NAME: IMPL.builtins.long.__rsub__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return long()
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        elif isinstance(other, long):
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            return long()
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        else:
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            TypeConstraintError
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    def __lt__(self, other):
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        """
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        NAME: IMPL.builtins.long.__lt__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return boolean()
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        elif isinstance(other, long):
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            return boolean()
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        else:
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            TypeConstraintError
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    def __gt__(self, other):
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        """
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        NAME: IMPL.builtins.long.__gt__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return boolean()
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        elif isinstance(other, long):
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            return boolean()
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        else:
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            TypeConstraintError
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    def __le__(self, other):
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        """
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        NAME: IMPL.builtins.long.__le__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return boolean()
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        elif isinstance(other, long):
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            return boolean()
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        else:
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            TypeConstraintError
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    def __ge__(self, other):
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        """
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        NAME: IMPL.builtins.long.__ge__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return boolean()
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        elif isinstance(other, long):
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            return boolean()
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        else:
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            TypeConstraintError
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    def __eq__(self, other):
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        """
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        NAME: IMPL.builtins.long.__eq__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return boolean()
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        elif isinstance(other, long):
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            return boolean()
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        else:
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            TypeConstraintError
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    def __ne__(self, other):
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        """
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        NAME: IMPL.builtins.long.__ne__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return boolean()
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        elif isinstance(other, long):
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            return boolean()
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        else:
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            TypeConstraintError
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    def __neg__(self):
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        """
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        NAME: IMPL.builtins.long.__neg__
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        NATIVE
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        """
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        return long()
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    def __pos__(self):
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        return self
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    def __str__(self):
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        """
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        NAME: IMPL.builtins.long.__str__
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        NATIVE
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        """
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        return string()
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    def __true__(self):
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        return self != 0
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class float:
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    """
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    NATIVE
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    INTERCHANGEABLE
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    """
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    def __iadd__(self, other):
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        """
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        NAME: IMPL.builtins.float.__iadd__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return float()
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        elif isinstance(other, long):
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            return float()
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        elif isinstance(other, float):
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            return float()
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        else:
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            TypeConstraintError
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    def __isub__(self, other):
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        """
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        NAME: IMPL.builtins.float.__isub__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return float()
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        elif isinstance(other, long):
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            return float()
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        elif isinstance(other, float):
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            return float()
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        else:
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            TypeConstraintError
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    def __add__(self, other):
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        """
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        NAME: IMPL.builtins.float.__add__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return float()
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        elif isinstance(other, long):
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            return float()
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        elif isinstance(other, float):
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            return float()
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        else:
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            TypeConstraintError
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    def __radd__(self, other):
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        """
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        NAME: IMPL.builtins.float.__radd__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return float()
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        elif isinstance(other, long):
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            return float()
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        elif isinstance(other, float):
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            return float()
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        else:
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            TypeConstraintError
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    def __sub__(self, other):
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        """
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        NAME: IMPL.builtins.float.__sub__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return float()
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        elif isinstance(other, long):
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            return float()
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        elif isinstance(other, float):
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            return float()
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        else:
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            TypeConstraintError
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    def __rsub__(self, other):
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        """
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        NAME: IMPL.builtins.float.__rsub__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return float()
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        elif isinstance(other, long):
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            return float()
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        elif isinstance(other, float):
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            return float()
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        else:
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            TypeConstraintError
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    def __mul__(self, other):
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        """
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        NAME: IMPL.builtins.float.__mul__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return float()
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        elif isinstance(other, long):
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            return float()
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        elif isinstance(other, float):
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            return float()
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        else:
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            TypeConstraintError
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    def __rmul__(self, other):
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        """
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        NAME: IMPL.builtins.float.__rmul__
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        NATIVE
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        """
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        if isinstance(other, int):
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            return float()
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        elif isinstance(other, long):
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            return float()
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        elif isinstance(other, float):
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            return float()
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        else:
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            TypeConstraintError
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    def __div__(self, other):
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        """
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        NAME: IMPL.builtins.float.__div__
paulb@22 548
        NATIVE
paulb@22 549
        """
paulb@22 550
        if isinstance(other, int):
paulb@22 551
            return float()
paulb@22 552
        elif isinstance(other, long):
paulb@22 553
            return float()
paulb@22 554
        elif isinstance(other, float):
paulb@22 555
            return float()
paulb@22 556
        else:
paulb@22 557
            TypeConstraintError
paulb@22 558
paulb@22 559
    def __rdiv__(self, other):
paulb@22 560
        """
paulb@22 561
        NAME: IMPL.builtins.float.__rdiv__
paulb@22 562
        NATIVE
paulb@22 563
        """
paulb@22 564
        if isinstance(other, int):
paulb@22 565
            return float()
paulb@22 566
        elif isinstance(other, long):
paulb@22 567
            return float()
paulb@22 568
        elif isinstance(other, float):
paulb@22 569
            return float()
paulb@22 570
        else:
paulb@22 571
            TypeConstraintError
paulb@22 572
paulb@22 573
    def __pow__(self, other):
paulb@22 574
        """
paulb@22 575
        NAME: IMPL.builtins.float.__pow__
paulb@22 576
        NATIVE
paulb@22 577
        """
paulb@22 578
        if isinstance(other, int):
paulb@22 579
            return float()
paulb@22 580
        elif isinstance(other, long):
paulb@22 581
            return float()
paulb@22 582
        elif isinstance(other, float):
paulb@22 583
            return float()
paulb@22 584
        else:
paulb@22 585
            TypeConstraintError
paulb@22 586
paulb@22 587
    def __rpow__(self, other):
paulb@22 588
        """
paulb@22 589
        NAME: IMPL.builtins.float.__rpow__
paulb@22 590
        NATIVE
paulb@22 591
        """
paulb@22 592
        if isinstance(other, int):
paulb@22 593
            return float()
paulb@22 594
        elif isinstance(other, long):
paulb@22 595
            return float()
paulb@22 596
        elif isinstance(other, float):
paulb@22 597
            return float()
paulb@22 598
        else:
paulb@22 599
            TypeConstraintError
paulb@22 600
paulb@22 601
    def __lt__(self, other):
paulb@22 602
        """
paulb@22 603
        NAME: IMPL.builtins.float.__lt__
paulb@22 604
        NATIVE
paulb@22 605
        """
paulb@22 606
        if isinstance(other, int):
paulb@22 607
            return boolean()
paulb@22 608
        elif isinstance(other, long):
paulb@22 609
            return boolean()
paulb@22 610
        elif isinstance(other, float):
paulb@22 611
            return boolean()
paulb@22 612
        else:
paulb@22 613
            TypeConstraintError
paulb@22 614
paulb@22 615
    def __gt__(self, other):
paulb@22 616
        """
paulb@22 617
        NAME: IMPL.builtins.float.__gt__
paulb@22 618
        NATIVE
paulb@22 619
        """
paulb@22 620
        if isinstance(other, int):
paulb@22 621
            return boolean()
paulb@22 622
        elif isinstance(other, long):
paulb@22 623
            return boolean()
paulb@22 624
        elif isinstance(other, float):
paulb@22 625
            return boolean()
paulb@22 626
        else:
paulb@22 627
            TypeConstraintError
paulb@22 628
paulb@22 629
    def __le__(self, other):
paulb@22 630
        """
paulb@22 631
        NAME: IMPL.builtins.float.__le__
paulb@22 632
        NATIVE
paulb@22 633
        """
paulb@22 634
        if isinstance(other, int):
paulb@22 635
            return boolean()
paulb@22 636
        elif isinstance(other, long):
paulb@22 637
            return boolean()
paulb@22 638
        elif isinstance(other, float):
paulb@22 639
            return boolean()
paulb@22 640
        else:
paulb@22 641
            TypeConstraintError
paulb@22 642
paulb@22 643
    def __ge__(self, other):
paulb@22 644
        """
paulb@22 645
        NAME: IMPL.builtins.float.__ge__
paulb@22 646
        NATIVE
paulb@22 647
        """
paulb@22 648
        if isinstance(other, int):
paulb@22 649
            return boolean()
paulb@22 650
        elif isinstance(other, long):
paulb@22 651
            return boolean()
paulb@22 652
        elif isinstance(other, float):
paulb@22 653
            return boolean()
paulb@22 654
        else:
paulb@22 655
            TypeConstraintError
paulb@22 656
paulb@22 657
    def __eq__(self, other):
paulb@22 658
        """
paulb@22 659
        NAME: IMPL.builtins.float.__eq__
paulb@22 660
        NATIVE
paulb@22 661
        """
paulb@22 662
        if isinstance(other, int):
paulb@22 663
            return boolean()
paulb@22 664
        elif isinstance(other, long):
paulb@22 665
            return boolean()
paulb@22 666
        elif isinstance(other, float):
paulb@22 667
            return boolean()
paulb@22 668
        else:
paulb@22 669
            TypeConstraintError
paulb@22 670
paulb@22 671
    def __ne__(self, other):
paulb@22 672
        """
paulb@22 673
        NAME: IMPL.builtins.float.__ne__
paulb@22 674
        NATIVE
paulb@22 675
        """
paulb@22 676
        if isinstance(other, int):
paulb@22 677
            return boolean()
paulb@22 678
        elif isinstance(other, long):
paulb@22 679
            return boolean()
paulb@22 680
        elif isinstance(other, float):
paulb@22 681
            return boolean()
paulb@22 682
        else:
paulb@22 683
            TypeConstraintError
paulb@22 684
paulb@22 685
    def __neg__(self):
paulb@22 686
        """
paulb@22 687
        NAME: IMPL.builtins.float.__neg__
paulb@22 688
        NATIVE
paulb@22 689
        """
paulb@22 690
        return float()
paulb@22 691
paulb@22 692
    def __pos__(self):
paulb@22 693
        return self
paulb@22 694
paulb@22 695
    def __str__(self):
paulb@22 696
        """
paulb@22 697
        NAME: IMPL.builtins.float.__str__
paulb@22 698
        NATIVE
paulb@22 699
        """
paulb@22 700
        return string()
paulb@22 701
paulb@22 702
    def __true__(self):
paulb@22 703
        return self != 0
paulb@22 704
paulb@22 705
class string:
paulb@22 706
    """
paulb@22 707
    NATIVE
paulb@22 708
    INTERCHANGEABLE
paulb@22 709
    """
paulb@22 710
    def __add__(self, other):
paulb@22 711
        """
paulb@22 712
        NAME: IMPL.builtins.string.__add__
paulb@22 713
        NATIVE
paulb@22 714
        """
paulb@22 715
        if isinstance(other, string):
paulb@22 716
            return string()
paulb@22 717
        else:
paulb@22 718
            TypeConstraintError
paulb@22 719
paulb@22 720
    def __radd__(self, other):
paulb@22 721
        """
paulb@22 722
        NAME: IMPL.builtins.string.__radd__
paulb@22 723
        NATIVE
paulb@22 724
        """
paulb@22 725
        if isinstance(other, string):
paulb@22 726
            return string()
paulb@22 727
        else:
paulb@22 728
            TypeConstraintError
paulb@22 729
paulb@22 730
    def __len__(self):
paulb@22 731
        """
paulb@22 732
        NAME: IMPL.builtins.string.__len__
paulb@22 733
        NATIVE
paulb@22 734
        """
paulb@22 735
        return int()
paulb@22 736
paulb@22 737
    def __str__(self):
paulb@22 738
        return self
paulb@22 739
paulb@22 740
    def __true__(self):
paulb@22 741
        return self.__len__() != 0
paulb@22 742
paulb@22 743
    def join(self, l):
paulb@22 744
        total = 0
paulb@22 745
        first = 1
paulb@22 746
        self_len = self.__len__()
paulb@22 747
        for i in l:
paulb@22 748
            if not first:
paulb@22 749
                total += self_len
paulb@22 750
            total += len(str(i))
paulb@22 751
            first = 0
paulb@22 752
        b = buffer(total)
paulb@22 753
        first = 1
paulb@22 754
        for i in l:
paulb@22 755
            if not first:
paulb@22 756
                b.append(self)
paulb@22 757
            b.append(str(i))
paulb@22 758
            first = 0
paulb@22 759
        s = str(b)
paulb@22 760
        return s
paulb@22 761
paulb@22 762
class buffer:
paulb@22 763
    """
paulb@22 764
    NATIVE
paulb@22 765
    INTERCHANGEABLE
paulb@22 766
    """
paulb@22 767
    def __init__(self, size):
paulb@22 768
        """
paulb@22 769
        NAME: IMPL.builtins.buffer.__init__
paulb@22 770
        NATIVE
paulb@22 771
        """
paulb@22 772
        if not isinstance(size, int):
paulb@22 773
            TypeConstraintError
paulb@22 774
paulb@22 775
    def append(self, s):
paulb@22 776
        """
paulb@22 777
        NAME: IMPL.builtins.buffer.append
paulb@22 778
        NATIVE
paulb@22 779
        """
paulb@22 780
        if not isinstance(s, string):
paulb@22 781
            TypeConstraintError
paulb@22 782
        pass
paulb@22 783
paulb@22 784
    def __str__(self):
paulb@22 785
        """
paulb@22 786
        NAME: IMPL.builtins.buffer.__str__
paulb@22 787
        NATIVE
paulb@22 788
        """
paulb@22 789
        return string()
paulb@22 790
paulb@22 791
class list:
paulb@22 792
    def __init__(self):
paulb@22 793
        self.next = None
paulb@22 794
        self.last = self
paulb@22 795
paulb@22 796
    def __getitem__(self, index):
paulb@22 797
        i = 0
paulb@22 798
        n = self
paulb@22 799
        # NOTE: Support negative indices using last.
paulb@22 800
        while i < index and n.next is not None:
paulb@22 801
            n = n.next
paulb@22 802
            i += 1
paulb@22 803
        if n.next is not None:
paulb@22 804
            return n.value
paulb@22 805
        else:
paulb@22 806
            raise IndexError() # NOTE: Make this compliant with Python!
paulb@22 807
paulb@22 808
    def __setitem__(self, index, value):
paulb@22 809
        i = 0
paulb@22 810
        n = self
paulb@22 811
        # NOTE: Support negative indices using last.
paulb@22 812
        while i < index and n.next is not None:
paulb@22 813
            n = n.next
paulb@22 814
            i += 1
paulb@22 815
        if n.next is not None:
paulb@22 816
            n.value = value
paulb@22 817
        else:
paulb@22 818
            raise IndexError() # NOTE: Make this compliant with Python!
paulb@22 819
paulb@22 820
    def __getslice__(self, start, end=None):
paulb@22 821
        slice = []
paulb@22 822
        i = 0
paulb@22 823
        n = self
paulb@22 824
        # NOTE: Support negative indices using last.
paulb@22 825
        while (end is None or i < end) and n.next is not None:
paulb@22 826
            if i >= start:
paulb@22 827
                slice.append(n.value)
paulb@22 828
            n = n.next
paulb@22 829
            i += 1
paulb@22 830
        return slice
paulb@22 831
paulb@22 832
    def __setslice__(self, start, end, slice):
paulb@22 833
        i = 0
paulb@22 834
        n = self
paulb@22 835
        j = 0
paulb@22 836
        p = slice
paulb@22 837
        # NOTE: Support negative indices using last.
paulb@22 838
        # NOTE: Support appending when start >= len(self).
paulb@22 839
        while i < end and n is not None and p is not None:
paulb@22 840
            if i >= start:
paulb@22 841
                n.value = p.value
paulb@22 842
                p = p.next
paulb@22 843
                j += 1
paulb@22 844
            n = n.next
paulb@22 845
            i += 1
paulb@22 846
paulb@22 847
    def append(self, value):
paulb@22 848
        n = self.last
paulb@22 849
        n.value = value
paulb@22 850
        n.next = self.__class__()
paulb@22 851
        self.last = n.next
paulb@22 852
paulb@22 853
    def __len__(self):
paulb@22 854
        i = 0
paulb@22 855
        n = self
paulb@22 856
        while n.next is not None:
paulb@22 857
            n = n.next
paulb@22 858
            i += 1
paulb@22 859
        return i
paulb@22 860
paulb@22 861
    def __add__(self, other):
paulb@22 862
        result = self.__class__()
paulb@22 863
        for value in self:
paulb@22 864
            result.append(value)
paulb@22 865
        for value in other:
paulb@22 866
            result.append(value)
paulb@22 867
        return result
paulb@22 868
paulb@22 869
    def __str__(self):
paulb@22 870
        output = ["["]
paulb@22 871
        n = self
paulb@22 872
        first = 1
paulb@22 873
        while n.next is not None:
paulb@22 874
            if not first:
paulb@22 875
                output.append(", ")
paulb@22 876
            else:
paulb@22 877
                first = 0
paulb@22 878
            output.append(str(n.value))
paulb@22 879
            n = n.next
paulb@22 880
        output.append("]")
paulb@22 881
        return "".join(output)
paulb@22 882
paulb@22 883
    def __iter__(self):
paulb@22 884
        return listiterator(self)
paulb@22 885
paulb@22 886
    def __true__(self):
paulb@22 887
        return self.__len__() != 0
paulb@22 888
paulb@22 889
class listiterator:
paulb@22 890
    def __init__(self, l):
paulb@22 891
        self.l = l
paulb@22 892
paulb@22 893
    def next(self):
paulb@22 894
        l = self.l
paulb@22 895
        next = l.next
paulb@22 896
        if next is not None:
paulb@22 897
            self.l = next
paulb@22 898
            return l.value
paulb@22 899
        else:
paulb@22 900
            raise StopIteration() # NOTE: Make this compliant with Python!
paulb@22 901
paulb@22 902
    def __true__(self):
paulb@22 903
        """
paulb@22 904
        NAME: IMPL.builtins.int.__true__
paulb@22 905
        NATIVE
paulb@22 906
        """
paulb@22 907
        return boolean()
paulb@22 908
paulb@22 909
class tuple:
paulb@22 910
    def __init__(self):
paulb@22 911
        self.next = None
paulb@22 912
        self.last = self
paulb@22 913
paulb@22 914
    def __getitem__(self, index):
paulb@22 915
        i = 0
paulb@22 916
        n = self
paulb@22 917
        # NOTE: Support negative indices using last.
paulb@22 918
        while i < index and n.next is not None:
paulb@22 919
            n = n.next
paulb@22 920
            i += 1
paulb@22 921
        if n.next is not None:
paulb@22 922
            return n.value
paulb@22 923
        else:
paulb@22 924
            raise IndexError() # NOTE: Make this compliant with Python!
paulb@22 925
paulb@22 926
    def __getslice__(self, start, end=None):
paulb@22 927
        # NOTE: Should probably return a tuple.
paulb@22 928
        slice = []
paulb@22 929
        i = 0
paulb@22 930
        n = self
paulb@22 931
        # NOTE: Support negative indices using last.
paulb@22 932
        while (end is None or i < end) and n.next is not None:
paulb@22 933
            if i >= start:
paulb@22 934
                slice.append(n.value)
paulb@22 935
            n = n.next
paulb@22 936
            i += 1
paulb@22 937
        return slice
paulb@22 938
paulb@22 939
    # NOTE: The append method should be internal at most.
paulb@22 940
paulb@22 941
    def append(self, value):
paulb@22 942
        n = self.last
paulb@22 943
        n.value = value
paulb@22 944
        n.next = self.__class__()
paulb@22 945
        self.last = n.next
paulb@22 946
paulb@22 947
    def __len__(self):
paulb@22 948
        i = 0
paulb@22 949
        n = self
paulb@22 950
        while n.next is not None:
paulb@22 951
            n = n.next
paulb@22 952
            i += 1
paulb@22 953
        return i
paulb@22 954
paulb@22 955
    def __add__(self, other):
paulb@22 956
        result = self.__class__()
paulb@22 957
        for value in self:
paulb@22 958
            result.append(value)
paulb@22 959
        for value in other:
paulb@22 960
            result.append(value)
paulb@22 961
        return result
paulb@22 962
paulb@22 963
    def __str__(self):
paulb@22 964
        output = ["("]
paulb@22 965
        n = self
paulb@22 966
        first = 1
paulb@22 967
        while n.next is not None:
paulb@22 968
            if not first:
paulb@22 969
                output.append(", ")
paulb@22 970
            else:
paulb@22 971
                first = 0
paulb@22 972
            output.append(str(n.value))
paulb@22 973
            n = n.next
paulb@22 974
        output.append(")")
paulb@22 975
        return "".join(output)
paulb@22 976
paulb@22 977
    def __iter__(self):
paulb@22 978
        return tupleiterator(self)
paulb@22 979
paulb@22 980
    def __true__(self):
paulb@22 981
        return self.__len__() != 0
paulb@22 982
paulb@22 983
class tupleiterator:
paulb@22 984
    def __init__(self, l):
paulb@22 985
        self.l = l
paulb@22 986
paulb@22 987
    def next(self):
paulb@22 988
        l = self.l
paulb@22 989
        next = l.next
paulb@22 990
        if next is not None:
paulb@22 991
            self.l = next
paulb@22 992
            return l.value
paulb@22 993
        else:
paulb@22 994
            raise StopIteration() # NOTE: Make this compliant with Python!
paulb@22 995
paulb@22 996
    def __true__(self):
paulb@22 997
        """
paulb@22 998
        NAME: IMPL.builtins.int.__true__
paulb@22 999
        NATIVE
paulb@22 1000
        """
paulb@22 1001
        return boolean()
paulb@22 1002
paulb@22 1003
class Exception:
paulb@22 1004
    pass
paulb@22 1005
paulb@22 1006
class StopIteration(Exception):
paulb@22 1007
    pass
paulb@22 1008
paulb@22 1009
class IndexError(Exception):
paulb@22 1010
    pass
paulb@22 1011
paulb@22 1012
class AttributeError(Exception):
paulb@22 1013
    pass
paulb@22 1014
paulb@22 1015
class TypeError(Exception):
paulb@22 1016
    pass
paulb@22 1017
paulb@22 1018
class none:
paulb@22 1019
    """
paulb@22 1020
    NATIVE
paulb@22 1021
    INTERCHANGEABLE
paulb@22 1022
    ATOMIC
paulb@22 1023
    """
paulb@22 1024
    def __true__(self):
paulb@22 1025
        return False
paulb@22 1026
paulb@22 1027
    def __str__(self):
paulb@22 1028
        return "None"
paulb@22 1029
paulb@22 1030
class undefined:
paulb@22 1031
    """
paulb@22 1032
    NATIVE
paulb@22 1033
    INTERCHANGEABLE
paulb@22 1034
    ATOMIC
paulb@22 1035
    """
paulb@22 1036
    pass
paulb@22 1037
paulb@22 1038
def isinstance(obj, cls):
paulb@22 1039
    """
paulb@22 1040
    NAME: IMPL.builtins.isinstance
paulb@22 1041
    NATIVE
paulb@22 1042
    SPECIAL
paulb@22 1043
    """
paulb@22 1044
    return boolean()
paulb@22 1045
paulb@22 1046
def issubclass(cls1, cls2):
paulb@22 1047
    """
paulb@22 1048
    NAME: IMPL.builtins.isinstance
paulb@22 1049
    NATIVE
paulb@22 1050
    SPECIAL
paulb@22 1051
    """
paulb@22 1052
    return boolean()
paulb@22 1053
paulb@22 1054
def len(x):
paulb@22 1055
    return x.__len__()
paulb@22 1056
paulb@22 1057
def max(*l):
paulb@22 1058
    max_so_far = l[0]
paulb@22 1059
    for i in l[1:]:
paulb@22 1060
        if i > max_so_far:
paulb@22 1061
            max_so_far = i
paulb@22 1062
    return max_so_far
paulb@22 1063
paulb@22 1064
def str(x):
paulb@22 1065
    return x.__str__()
paulb@22 1066
paulb@22 1067
class xrange:
paulb@22 1068
    def __init__(self, start, end, step=1):
paulb@22 1069
        self.start = start
paulb@22 1070
        self.end = end
paulb@22 1071
        self.step = step
paulb@22 1072
        self.current = start
paulb@22 1073
paulb@22 1074
    def __iter__(self):
paulb@22 1075
        return self
paulb@22 1076
paulb@22 1077
    def next(self):
paulb@22 1078
        if self.current >= self.end:
paulb@22 1079
            raise StopIteration()
paulb@22 1080
        current = self.current
paulb@22 1081
        self.current += self.step
paulb@22 1082
        return current
paulb@22 1083
paulb@22 1084
# Special values. None of these definitions should be generated by the compiler.
paulb@22 1085
# All such definitions should be made in the underlying implementation.
paulb@22 1086
paulb@22 1087
True = boolean()
paulb@22 1088
False = boolean()
paulb@22 1089
None = none()
paulb@22 1090
Undefined = undefined()
paulb@22 1091
paulb@22 1092
# Special functions. These all operate on references at run-time.
paulb@22 1093
paulb@22 1094
def __is__(a, b):
paulb@22 1095
    """
paulb@22 1096
    NAME: IMPL.builtins.__is__
paulb@22 1097
    NATIVE
paulb@22 1098
    """
paulb@22 1099
    return boolean()
paulb@22 1100
paulb@22 1101
def __is_not__(a, b):
paulb@22 1102
    """
paulb@22 1103
    NAME: IMPL.builtins.__is_not__
paulb@22 1104
    NATIVE
paulb@22 1105
    """
paulb@22 1106
    return boolean()
paulb@22 1107
paulb@22 1108
def __not__(a):
paulb@22 1109
    """
paulb@22 1110
    NAME: IMPL.builtins.__not__
paulb@22 1111
    NATIVE
paulb@22 1112
    """
paulb@22 1113
    return boolean()
paulb@22 1114
paulb@22 1115
# vim: tabstop=4 expandtab shiftwidth=4