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gh-131831: Implement PEP 758 – Allow except and except* expressions without parentheses #131833

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Merged
pablogsal merged 10 commits into from
Apr 1, 2025
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gh-131831: Implement PEP 758 – Allow except and except* expressions without parentheses #131833

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gh-131831: Implement PEP 758 – Allow except and except* expressions w…
pablogsal Mar 28, 2025
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Update Doc/whatsnew/3.14.rst
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Update Doc/whatsnew/3.14.rst
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Update Doc/whatsnew/3.14.rst
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Update Lib/test/test_syntax.py
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update error message
pablogsal Mar 31, 2025
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update error message
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@pablogsal
pablogsal committed Mar 31, 2025
commit 955a4331a1d52633aff1c3a41e8e047affcb6ee8
4 changes: 2 additions & 2 deletions Grammar/python.gram
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Original file line number Diff line number Diff line change
Expand Up @@ -1361,15 +1361,15 @@ invalid_try_stmt:
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, "cannot have both 'except' and 'except*' on the same 'try'") }
invalid_except_stmt:
| 'except' a=expression ',' expressions 'as' NAME ':' {
RAISE_SYNTAX_ERROR_STARTING_FROM(a, "multiple exception types must be parenthesized") }
RAISE_SYNTAX_ERROR_STARTING_FROM(a, "multiple exception types must be parenthesized when using 'as'") }
| a='except' expression ['as' NAME ] NEWLINE { RAISE_SYNTAX_ERROR("expected ':'") }
| a='except' NEWLINE { RAISE_SYNTAX_ERROR("expected ':'") }
| 'except' expression 'as' a=expression {
RAISE_SYNTAX_ERROR_KNOWN_LOCATION(
a, "cannot use except statement with %s", _PyPegen_get_expr_name(a)) }
invalid_except_star_stmt:
| 'except' '*' a=expression ',' expressions 'as' NAME ':' {
RAISE_SYNTAX_ERROR_STARTING_FROM(a, "multiple exception types must be parenthesized") }
RAISE_SYNTAX_ERROR_STARTING_FROM(a, "multiple exception types must be parenthesized when using 'as'") }
| a='except' '*' expression ['as' NAME ] NEWLINE { RAISE_SYNTAX_ERROR("expected ':'") }
| a='except' '*' (NEWLINE | ':') { RAISE_SYNTAX_ERROR("expected one or more exception types") }
| 'except' '*' expression 'as' a=expression {
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6 changes: 3 additions & 3 deletions Lib/test/test_syntax.py
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Expand Up @@ -1674,7 +1674,7 @@
... except A, B, C as blech:
... pass
Traceback (most recent call last):
SyntaxError: multiple exception types must be parenthesized
SyntaxError: multiple exception types must be parenthesized when using 'as'

>>> try:
... pass
Expand All @@ -1691,7 +1691,7 @@
... except* A, B, C as blech:
... pass
Traceback (most recent call last):
SyntaxError: multiple exception types must be parenthesized
SyntaxError: multiple exception types must be parenthesized when using 'as'

>>> try:
... pass
Expand All @@ -1700,7 +1700,7 @@
... finally:
... pass
Traceback (most recent call last):
SyntaxError: multiple exception types must be parenthesized
SyntaxError: multiple exception types must be parenthesized when using 'as'

Custom exception for 'except*' without an exception type

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4 changes: 2 additions & 2 deletions Parser/parser.c
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