• QuestionStaticmethod

-- DavidLambert 2007-07-18 15:08:31

'''
    $ python
    Python 2.5.1 (r251:54863, Jun 25 2007, 14:55:49)
    [GCC 3.4.4 (cygming special) (gdc 0.12, using dmd 0.125)] on cygwin
    Type "help", "copyright", "credits" or "license" for more information.
    >>>
'''


x = 'abc'
expect = 'abcabcabc'

class C(object):
    def f(x):
        return x*3
    __call__ = staticmethod(f)

assert expect == C()(x)                 # works great
                                        # straightforward from docs




E = type('E',(object,),dict(__call__=staticmethod(C.__call__)))

assert expect == E()(x)                 # works great, why must I
                                        # repeat staticmethod?





def f(x):
    return x*3

class G(object):
    __call__ = staticmethod(f)

assert expect == G()(x)                 # works great, works as I expect







# My opportunity to make a static method has passed?

I = type('I',(C,),dict(__call__ = staticmethod(C.f)))

try:
    assert expect == I()(x)
except TypeError,info:                  # I don\'t understand.
    assert info.message.startswith('unbound method f()')




# Staticness lost?

F = type('F',(object,),dict(__call__=C.__call__))

try:
    assert expect == F()(x)
except TypeError,info:                  # misunderstood,
    assert info.message.startswith('f() takes exactly 1 argument (2 given)')