Bruno Loff <[email protected]> added the comment:
Hmm yes, some more words in the documentation might help.
Does anyone understand why it happens, though?
Specifically, note that
sum(get(i) for i in range(len(l)))
or
eval("get(0) + get(1) + get(2) + get(3)")
or
eval("sum(get(i) for i in range(len(l)))", locals())
work just fine, but
eval("sum(get(i) for i in range(len(l)))")
fails, which is really confusing. I have no mental model of what is happening
that allows for the first thing to work, but disallows for the second thing. I
understand it has something to do with the creation of a new subscope when the
comprehension is run, but other than that, I don't really understand.
Also, ideally, the last thing should work, too.
I am teaching programming to college students and I could not explain to them
why the first three worked but the last one failed. There was simply nothing I
could say that would give them a good mental model for the execution.
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<https://bugs.python.org/issue43605>
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