New submission from ksqsf:
The code
key = ["a", "b"]
val = [1, 2]
dic = {key:val for key in key for val in val}
will raise UnboundLocalError in Python 3.6.2 and 2.7.13.
Intuitively, the element 'key' and the list 'key' are not the same, so
generally the expected result is {"a": 1, "b": 2}.
There are similar cases for listcomps, setcomps and genexprs:
l = [1, 2, 3]
{l for l in l} # => {1, 2, 3}
[l for l in l] # => [1, 2, 3]
for l in (l for l in l):
print(l, end=' ')
# => 1 2 3
All of them do as what is expected.
For consistency and intuitiveness, the behavior of distcomps should be modified
so that no UnboundLocalError is raised.
----------
components: Interpreter Core
messages: 299799
nosy: ksqsf
priority: normal
severity: normal
status: open
title: dict comprehension shouldn't raise UnboundLocalError
type: behavior
versions: Python 3.6
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue31126>
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