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campaul/gist:2504ebd760a9b9ae6b0d

Created January 27, 2015 23:25
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gistfile1.py
Python 3.4.2 (default, Jan 12 2015, 11:38:40)
[GCC 4.9.2 20141224 (prerelease)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> def foo(x=[]):
... x.append('1')
... return x
...
>>> foo()
['1']
>>> foo()
['1', '1']
>>> foo()
['1', '1', '1']
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