New submission from Arne Recknagel <[email protected]>:
All code is run on python build from the current 3.8 branch.
The following doesn't work:
>>> [x for x in 'foo' if y := True]
File "<stdin>", line 1
[x for x in 'foo' if y := True]
^
SyntaxError: invalid syntax
While this does:
>>> [x for x in 'foo' if (y := True)]
['f', 'o', 'o']
Since assignment expressions work without parentheses in normal if-clauses and
there being no mention on it explicitly being disallowed, this seems to either
be a bug or an oversight in the documentation (with my own opinion, for what
it's worth, being that it's a bug).
----------
messages: 353203
nosy: arne, emilyemorehouse
priority: normal
severity: normal
status: open
title: Allowing conditions with assignment expressions in comprehensions
without parantheses
versions: Python 3.8
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Python tracker <[email protected]>
<https://bugs.python.org/issue38277>
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