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bpo-32012: Disallow trailing comma after genexpr without parenthesis. (#4382)

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Serhiy Storchaka 2017-11-15 08:49:40 +02:00 • committed by GitHub
parent 3bda02222a
commit 9165f77d5f
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4 changed files with 45 additions and 13 deletions
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21
Lib/test/test_syntax.py
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@ -125,17 +125,32 @@ SyntaxError: invalid syntax
From ast_for_call():
>>> def f(it, *varargs):
>>> def f(it, *varargs, **kwargs):
... return list(it)
>>> L = range(10)
>>> f(x for x in L)
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> f(x for x in L, 1)
Traceback (most recent call last):
SyntaxError: Generator expression must be parenthesized if not sole argument
SyntaxError: Generator expression must be parenthesized
>>> f(x for x in L, y=1)
Traceback (most recent call last):
SyntaxError: Generator expression must be parenthesized
>>> f(x for x in L, *[])
Traceback (most recent call last):
SyntaxError: Generator expression must be parenthesized
>>> f(x for x in L, **{})
Traceback (most recent call last):
SyntaxError: Generator expression must be parenthesized
>>> f(L, x for x in L)
Traceback (most recent call last):
SyntaxError: Generator expression must be parenthesized
>>> f(x for x in L, y for y in L)
Traceback (most recent call last):
SyntaxError: Generator expression must be parenthesized if not sole argument
SyntaxError: Generator expression must be parenthesized
>>> f(x for x in L,)
Traceback (most recent call last):
SyntaxError: Generator expression must be parenthesized
>>> f((x for x in L), 1)
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]