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python parens pasted by caolanm on Wed Jul 19 11:17:14 2017

>>> False == False in [False]
True
>>> False == (False in [False])
False
>>> (False == False) in [False]
False

caolan added by evhan on Wed Jul 19 11:28:17 2017

>>> def foo(a=[]):
...     a += [1]
...     return a
...
>>> foo()
[1]
>>> foo()
[1, 1]
>>> foo()
[1, 1, 1]

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            _         __ _           
__   ____ _| |_ _ __ / _| |__  _ __  
\ \ / / _` | __| '__| |_| '_ \| '_ \ 
 \ V / (_| | |_| |  |  _| | | | |_) |
  \_/ \__,_|\__|_|  |_| |_| |_| .__/ 
                              |_|    
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