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Thu Apr 26 12:39:47 EDT 2018 · https://mail.python.org/pipermail/python-dev/2018-April/153134.html

[Guido]
> Maybe the order for d[k] = v should also be reconsidered?

There's certainly code in the wild relying on the order "v, then d,
then k", because that's just how assignment statements have always
worked (dicts or not).  I'd rather change the dict comprehension code,
because I think the analogy to what `d[k] = v` does is weak.  I
expect:

    {f(): g() for _ in [1]|

to do the same as

   {f(): g()}

The former currently evaluates g() first; the latter f().  Since I
also expect both of those to do the same as

    dict((f(), g()) for _ in [1])

f() has to win ;-)

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