Mark Dickinson <dicki...@gmail.com> added the comment:

True: there's another detail here that's needed to explain the behaviour. The 
first "for" clause in a list comprehension is special: it's evaluated in the 
enclosing scope, rather than in the local function scope that the list 
comprehension creates. See the docs here: 
https://docs.python.org/3.9/reference/expressions.html?highlight=list%20comprehension#displays-for-lists-sets-and-dictionaries

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45862>
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