bpo-40334: Allow trailing comma in parenthesized context managers by pablogsal · Pull Request #19964 · python/cpython · GitHub
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bpo-40334: Allow trailing comma in parenthesized context managers #19964

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Merged
pablogsal merged 1 commit into from
May 6, 2020
Merged

bpo-40334: Allow trailing comma in parenthesized context managers #19964

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4 changes: 2 additions & 2 deletions Grammar/python.gram
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66 changes: 65 additions & 1 deletion Lib/test/test_grammar.py
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
# Python test set -- part 1, grammar.
# This just tests whether the parser accepts them all.

from test.support import check_syntax_error, check_syntax_warning
from test.support import check_syntax_error, check_syntax_warning, use_old_parser
import inspect
import unittest
import sys
Expand Down Expand Up @@ -1694,6 +1694,70 @@ def __exit__(self, *args):
with manager() as x, manager():
pass

if not use_old_parser():
test_cases = [
"""if 1:
with (
manager()
):
pass
""",
"""if 1:
with (
manager() as x
):
pass
""",
"""if 1:
with (
manager() as (x, y),
manager() as z,
):
pass
""",
"""if 1:
with (
manager(),
manager()
):
pass
""",
"""if 1:
with (
manager() as x,
manager() as y
):
pass
""",
"""if 1:
with (
manager() as x,
manager()
):
pass
""",
"""if 1:
with (
manager() as x,
manager() as y,
manager() as z,
):
pass
""",
"""if 1:
with (
manager() as x,
manager() as y,
manager(),
):
pass
""",
]
for case in test_cases:
with self.subTest(case=case):
compile(case, "<string>", "exec")


def test_if_else_expr(self):
# Test ifelse expressions in various cases
def _checkeval(msg, ret):
Expand Down
16 changes: 12 additions & 4 deletions Parser/pegen/parse.c
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