Lichen

Annotated lib/__builtins__/iteration/summary.py

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14 months ago Paul Boddie file changeset files shortlog Introduce special well-defined instances, similar to predefined constants, to support loop exit conditions without having to raise a new instance as an exception on every occasion. well-defined-instances
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#!/usr/bin/env python
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"""
 
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Iterator summary functions.
 
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Copyright (C) 2015, 2016, 2017 Paul Boddie <paul@boddie.org.uk>
 
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This program is free software; you can redistribute it and/or modify it under
 
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the terms of the GNU General Public License as published by the Free Software
 
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Foundation; either version 3 of the License, or (at your option) any later
 
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version.
 
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This program is distributed in the hope that it will be useful, but WITHOUT
 
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 
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FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 
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details.
 
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You should have received a copy of the GNU General Public License along with
 
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this program.  If not, see <http://www.gnu.org/licenses/>.
 
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"""
 
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def max(args):
 
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    "Implementation of max."
 
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    highest = None
 
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    for arg in args:
 
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        if highest is None or arg > highest:
 
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            highest = arg
 
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    return highest
 
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def min(args):
 
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    "Implementation of min."
 
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    lowest = None
 
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    for arg in args:
 
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        if lowest is None or arg < lowest:
 
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            lowest = arg
 
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    return lowest
 
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def sum(sequence, start=0):
 
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    "Sum the elements in 'sequence', adding to any indicated 'start' value."
 
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    total = start
 
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    for i in sequence:
 
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        total += i
 
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    return total
 
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