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Tue Apr 24 21:01:02 EDT 2018 · https://mail.python.org/pipermail/python-dev/2018-April/153013.html

On 2018-04-24 23:32, Cameron Simpson wrote:
> On 24Apr2018 08:51, Ethan Furman <ethan at stoneleaf.us> wrote:
>>>When I compare to variables from outer scopes they *usually* are on
>>>the *right* side of '=='.
>>
>>You mean something like
>>
>>  if 2 == x:
>>
>>?  I never write code like that, and I haven't seen it, either.
> 
> Just to this, I also never write code like that but I've certainly seen it
> advocated.
> 
> I think the rationale was that it places the comparison value foremost in one's
> mind, versus the name being tested. I'm not persuaded, but it is another
> subjective situation.
> 
It's sometimes advocated in C/C++ code to help catch the inadvertent use 
of = instead of ==, but that's not a problem in Python.

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[Python-Dev] assignment expressions: an alternative proposal