Message 349025 - Python tracker

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Author	ncoghlan
Recipients	barry, emilyemorehouse, eric.smith, gvanrossum, joernheissler, koobs, miss-islington, ncoghlan, nedbat, pablogsal, rhettinger, serhiy.storchaka, steven.daprano, tim.peters, veky, willingc, xtreak
Date	2019-08-05.04:36:52
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1564979812.19.0.296945997043.issue35224@roundup.psfhosted.org>
In-reply-to

Content
Thanks Guido. The former test cases that the new PR removes are the following: res = [i := i for i in range(5)] res = [i := 0 for i, j in [(1, 2), (3, 4)]] res = [(i := 0, j := 1) for i, j in [(1, 2), (3, 4)]] res = [(i := i, j := j) for i, j in [(1, 2), (3, 4)]] res = [(i := j, j := i) for i, j in [(1, 2), (3, 4)]] These all raise TargetScopeError with the PR applied: >>> res = [i := i for i in range(5)] File "<stdin>", line 1 TargetScopeError: named expression cannot rebind comprehension iteration variable >>> res = [i := 0 for i, j in [(1, 2), (3, 4)]] File "<stdin>", line 1 TargetScopeError: named expression cannot rebind comprehension iteration variable >>> res = [(i := 0, j := 1) for i, j in [(1, 2), (3, 4)]] File "<stdin>", line 1 TargetScopeError: named expression cannot rebind comprehension iteration variable >>> res = [(i := i, j := j) for i, j in [(1, 2), (3, 4)]] File "<stdin>", line 1 TargetScopeError: named expression cannot rebind comprehension iteration variable >>> res = [(i := j, j := i) for i, j in [(1, 2), (3, 4)]] File "<stdin>", line 1 TargetScopeError: named expression cannot rebind comprehension iteration variable

Thanks Guido. The former test cases that the new PR removes are the following:

res = [i := i for i in range(5)]
res = [i := 0 for i, j in [(1, 2), (3, 4)]]
res = [(i := 0, j := 1) for i, j in [(1, 2), (3, 4)]]
res = [(i := i, j := j) for i, j in [(1, 2), (3, 4)]]
res = [(i := j, j := i) for i, j in [(1, 2), (3, 4)]]

These all raise TargetScopeError with the PR applied:

>>> res = [i := i for i in range(5)]
  File "<stdin>", line 1
TargetScopeError: named expression cannot rebind comprehension iteration variable
>>> res = [i := 0 for i, j in [(1, 2), (3, 4)]]
  File "<stdin>", line 1
TargetScopeError: named expression cannot rebind comprehension iteration variable
>>> res = [(i := 0, j := 1) for i, j in [(1, 2), (3, 4)]]
  File "<stdin>", line 1
TargetScopeError: named expression cannot rebind comprehension iteration variable
>>> res = [(i := i, j := j) for i, j in [(1, 2), (3, 4)]]
  File "<stdin>", line 1
TargetScopeError: named expression cannot rebind comprehension iteration variable
>>> res = [(i := j, j := i) for i, j in [(1, 2), (3, 4)]]
  File "<stdin>", line 1
TargetScopeError: named expression cannot rebind comprehension iteration variable

History
Date	User	Action	Args
2019-08-05 04:36:52	ncoghlan	set	recipients: + ncoghlan, gvanrossum, tim.peters, barry, rhettinger, eric.smith, nedbat, steven.daprano, serhiy.storchaka, koobs, willingc, veky, emilyemorehouse, joernheissler, pablogsal, miss-islington, xtreak
2019-08-05 04:36:52	ncoghlan	set	messageid: <1564979812.19.0.296945997043.issue35224@roundup.psfhosted.org>
2019-08-05 04:36:52	ncoghlan	link	issue35224 messages
2019-08-05 04:36:52	ncoghlan	create