C Barr Leigh a écrit :
> Help! Have I found a serious bug?
No. This is a FAQ. Default arguments of functions are evaled only once -
when the def statement is eval'd and the function object constructed.
> This seems like highly undesired behaviour to me.
Possibly, but this is unlikely to change in a near future, so you'd
better get used to it. If you want mutable objects as default values for
functions, the idiom is:
def some_func(default=None):
if default is None:
default = []
# code here
HTH
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