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Wed Aug 12 21:05:50 CEST 2015 · https://mail.python.org/pipermail/python-dev/2015-August/141250.html

Is it intended that closures created in exec statement/function cannot see
locals if the exec was provided a locals dictionary?

This code gives an error ("foo" is not found during lambda execution):

    exec("def foo(x): return x\n\n(lambda x:foo(x))(0)", globals(), {})

while executes normally with

    exec("def foo(x): return x\n\n(lambda x:foo(x))(0)")

Is this the expected behavior? If so where is it documented?

Andrea
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[Python-Dev] About closures creates in exec