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tych0/Python mutable default arg gotcha

Created May 14, 2013 00:48
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Python mutable default arg gotcha
smitten:~/playground$ python
Python 2.7.4 (default, Apr 19 2013, 18:28:01)
[GCC 4.7.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> def gotcha(foo=[]): return foo
...
>>> gotcha().append(1)
>>> gotcha()
[1]
>>>
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