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>>> do_something.func_defaults
(['some item'],)
>>>
>>> do_something(['my item'])
['my item', 'some item']
>>> do_something(['my item'])
['my item', 'some item']
>>> do_something(['my item'])
['my item', 'some item']
>>>
>>> do_something()
['some item']
>>> do_something()
['some item', 'some item']
>>> do_something()
['some item', 'some item', 'some item']
>>> do_something()
['some item', 'some item', 'some item', 'some item']
>>>
def do_something(some_list=[]):
some_list.append('some item')
print some_list