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Tue Apr 8 16:22:45 CEST 2008 · https://mail.python.org/pipermail/python-dev/2008-April/078494.html

[Sorry for the dupes.  Lesson: never try and send mail from a moving train.]

Eric Smith wrote:
> Alessandro Guido wrote:
>> Can anybody please point me why print('a', 'b', sep=None, end=None) should
>> produce "a b\n" instead of "ab"?
>> I've read http://docs.python.org/dev/3.0/library/functions.html#print, pep-3105 and some
>> ml threads but did not find a good reason justifying such a strange behaviour.
>>
>> Thanks.
>>
>> 	-Alessandro Guido
> 
> Because None means 'use the default value'.  You probably want:
> print('a', 'b', sep='', end='')
> 
>  >>> import io
>  >>> s = io.StringIO()
>  >>> print('a', 'b', end='', sep='', file=s)
>  >>> s.getvalue()
> 'ab'
>  >>>
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print function treats sep=None and end=None in an unintuitive way