Antoon Pardon wrote: >> This is a FAQ. Default arguments are only evaled once - when the def >> statement is evaled (which is usually at import time). The solution is >> simple: don't use mutable objects as default arguments: >> > > An immutable object would have given the same behaviour in this case > > class A(object): > def __init__(self, val = ()): > self.val=val > > obj1 = A() > obj2 = A() > > print obj1 is obj2 # False > print obj1.val is obj2.val # True > > Yeah, but is that a problem? Since you can not change them anyway, there's no harm. W
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