2018-07-12 | Paul Boddie | file changeset files shortlog | Demonstrate method and function assignments. |
paul@601 | 1 | class C: |
paul@601 | 2 | def f(self): |
paul@601 | 3 | print self |
paul@601 | 4 | return self.value() |
paul@601 | 5 | |
paul@601 | 6 | def value(self): |
paul@601 | 7 | return 123 |
paul@601 | 8 | |
paul@601 | 9 | c = C() |
paul@601 | 10 | |
paul@601 | 11 | class D: |
paul@601 | 12 | f = c.f |
paul@601 | 13 | |
paul@601 | 14 | d = D() |
paul@601 | 15 | |
paul@853 | 16 | def fn(): |
paul@853 | 17 | return 456 |
paul@853 | 18 | |
paul@853 | 19 | class E: |
paul@853 | 20 | f = fn |
paul@853 | 21 | g = C.f |
paul@853 | 22 | |
paul@853 | 23 | e = E() |
paul@853 | 24 | |
paul@601 | 25 | print c.f.__name__ # f |
paul@601 | 26 | print c.f() # <__main__.C instance> |
paul@601 | 27 | # 123 |
paul@601 | 28 | print d.f.__name__ # wrapper |
paul@601 | 29 | print d.f() # <__main__.C instance> |
paul@601 | 30 | # 123 |
paul@853 | 31 | |
paul@853 | 32 | print e.f.__name__ # fn |
paul@853 | 33 | print e.f() # 456 |
paul@853 | 34 | print e.g.__name__ # f |
paul@853 | 35 | |
paul@853 | 36 | try: |
paul@853 | 37 | print e.g() |
paul@853 | 38 | except TypeError: |
paul@853 | 39 | print "e.g(): e is an incompatible instance for E.g which is C.f" |
paul@853 | 40 | |
paul@853 | 41 | g = get_using(E.g, c) |
paul@853 | 42 | print g.__name__ # f |
paul@853 | 43 | print g() # <__main__.C instance> |
paul@853 | 44 | # 123 |