Bugs item #1661603, was opened at 2007-02-16 15:32
Message generated for change (Comment added) made by gbrandl
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Category: Parser/Compiler
Group: Python 2.4
>Status: Closed
>Resolution: Invalid
Priority: 5
Private: No
Submitted By: Matthijs (matthijsd)
Assigned to: Nobody/Anonymous (nobody)
Summary: Misleading behavior for [] and {} default arguments
Initial Comment:
Hello
On python 2.3.4 and 2.4.3,
>>> def a(x=[]):
... return x
...
>>> y=a()
>>> y.append(1)
>>> a()
[1]
Hence, the default argument is not recomputed. The same behavior occurs with
x={} instead of x=[].
This looks like a bug because it is not coherent with
>>> def f():
... return []
...
>>> y=f()
>>> y.append(5)
>>> f()
[]
So, is it a feature?
Thanks
----------------------------------------------------------------------
>Comment By: Georg Brandl (gbrandl)
Date: 2007-02-16 15:40
Message:
Logged In: YES
user_id=849994
Originator: NO
Yes, it is. (Please post questions about Python semantics to the
comp.lang.python newsgroup, they'll explain them in detail...)
----------------------------------------------------------------------
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