R. David Murray added the comment:
Thanks for the report. Retitling because this has nothing to do with map:
>>> def foo(*args):
... raise TypeError('fake')
... yield 1
...
>>> foo(1, *foo())
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: foo() argument after * must be an iterable, not generator
>>> foo(*foo())
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 2, in foo
TypeError: fake
----------
nosy: +r.david.murray
stage: -> needs patch
title: Bad error message about maps not iterable -> *args unpacking can mask
TypeErrors
versions: +Python 3.7
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<http://bugs.python.org/issue31071>
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