bpo-32012: Disallow trailing comma after genexpr without parenthesis. · python/cpython@db4aafc · GitHub
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bpo-32012: Disallow trailing comma after genexpr without parenthesis.
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Lines changed: 45 additions & 13 deletions

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‎Doc/whatsnew/3.7.rst‎

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‎Lib/test/test_syntax.py‎

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From ast_for_call():
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>>> def f(it, *varargs):
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>>> def f(it, *varargs, **kwargs):
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... return list(it)
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>>> L = range(10)
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>>> f(x for x in L)
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[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
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>>> f(x for x in L, 1)
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Traceback (most recent call last):
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SyntaxError: Generator expression must be parenthesized if not sole argument
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SyntaxError: Generator expression must be parenthesized
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>>> f(x for x in L, y=1)
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Traceback (most recent call last):
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SyntaxError: Generator expression must be parenthesized
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>>> f(x for x in L, *[])
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Traceback (most recent call last):
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SyntaxError: Generator expression must be parenthesized
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>>> f(x for x in L, **{})
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Traceback (most recent call last):
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SyntaxError: Generator expression must be parenthesized
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>>> f(L, x for x in L)
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Traceback (most recent call last):
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SyntaxError: Generator expression must be parenthesized
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>>> f(x for x in L, y for y in L)
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Traceback (most recent call last):
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SyntaxError: Generator expression must be parenthesized if not sole argument
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SyntaxError: Generator expression must be parenthesized
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>>> f(x for x in L,)
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Traceback (most recent call last):
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SyntaxError: Generator expression must be parenthesized
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>>> f((x for x in L), 1)
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[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
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‎Misc/NEWS.d/next/Core and Builtins/2017-11-13-00-37-11.bpo-32012.Kprjqe.rst‎

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SyntaxError now is raised when a generator expression without parenthesis is
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passed as argument but followed by trailing comma. A generator expression
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always needs to be directly inside a set of parentheses and cannot have a
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comma on either side.

‎Python/ast.c‎

Lines changed: 9 additions & 10 deletions

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