Fredrik Lundh a écrit :
> Christophe wrote:
>
>
>>I think you've made a mistake in your example.
>
>
> >>> constant A = []
> >>> def foo(var):
> ... var.append('1')
> ... print var
> ...
> >>> b = A
> >>> foo(b)
> >>> foo(b)
>
>
>>>and this ?
>>>
>>> >>> constant A = []
>>> >>> print A is A
>>
>>Obviously, False.
>
>
> why obviously ? why shouldn't a constant be constant ?
>
> </F>
Because the name A is bound by the compiler to mean construct a new
object since [] is mutable.
Same reason why :
>>> def A(): return []
>>> print A() is A()
False
It gives btw one possible implementation ;)
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