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>> 
>> - install.install_dists = lambda x, y=None: None
>> + install.install_dists = lambda x, y = None: None
>> PEP 8: Never put spaces in a function (or lambda) signature.
>
> I cannot find that exactly in pep8.
From the section "Whitespace in Expressions and Statements":
 - Don't use spaces around the '=' sign when used to indicate a
 keyword argument or a default parameter value.
 Yes:
 def complex(real, imag=0.0):
 return magic(r=real, i=imag)
 No:
 def complex(real, imag = 0.0):
 return magic(r = real, i = imag)