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bpo-39394: Improve warning message in the re module #31988

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Merged
merged 1 commit into from
Mar 19, 2022
Merged

bpo-39394: Improve warning message in the re module #31988

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4 changes: 3 additions & 1 deletion Lib/sre_parse.py
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Original file line number Diff line number Diff line change
Expand Up @@ -807,9 +807,11 @@ def _parse(source, state, verbose, nested, first=False):
if not first or subpattern:
import warnings
warnings.warn(
'Flags not at the start of the expression %r%s' % (
'Flags not at the start of the expression %r%s'
' but at position %d' % (
source.string[:20], # truncate long regexes
' (truncated)' if len(source.string) > 20 else '',
start,
),
DeprecationWarning, stacklevel=nested + 6
)
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9 changes: 6 additions & 3 deletions Lib/test/test_re.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1444,7 +1444,8 @@ def test_inline_flags(self):
self.assertTrue(re.match(p, lower_char))
self.assertEqual(
str(warns.warnings[0].message),
'Flags not at the start of the expression %r' % p
'Flags not at the start of the expression %r'
' but at position 1' % p
)
self.assertEqual(warns.warnings[0].filename, __file__)

Expand All @@ -1453,7 +1454,8 @@ def test_inline_flags(self):
self.assertTrue(re.match(p, lower_char))
self.assertEqual(
str(warns.warnings[0].message),
'Flags not at the start of the expression %r (truncated)' % p[:20]
'Flags not at the start of the expression %r (truncated)'
' but at position 1' % p[:20]
)
self.assertEqual(warns.warnings[0].filename, __file__)

Expand All @@ -1465,7 +1467,8 @@ def test_inline_flags(self):
self.assertTrue(re.match(p, b'a'))
self.assertEqual(
str(warns.warnings[0].message),
'Flags not at the start of the expression %r' % p
'Flags not at the start of the expression %r'
' but at position 1' % p
)
self.assertEqual(warns.warnings[0].filename, __file__)

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2022-03-19-13-38-29.bpo-39394.7j6WL6.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
A warning about inline flags not at the start of the regular expression now
contains the position of the flag.