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[3.12] gh-114014: Update fractions.Fraction()'s rational parsing regex (GH-114015) (#114023)

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Fix a bug in the regex used for parsing a string input to the `fractions.Fraction` constructor. That bug led to an inconsistent exception message being given for some inputs.

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(cherry picked from commit dd56b57483)

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Miss Islington (bot) 2024-01-13 19:21:34 +01:00 • committed by GitHub
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3 changed files with 35 additions and 10 deletions
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24
Lib/test/test_fractions.py
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@ -261,6 +261,30 @@ class FractionTest(unittest.TestCase):
self.assertRaisesMessage(
ValueError, "Invalid literal for Fraction: '1.1e+1__1'",
F, "1.1e+1__1")
self.assertRaisesMessage(
ValueError, "Invalid literal for Fraction: '123.dd'",
F, "123.dd")
self.assertRaisesMessage(
ValueError, "Invalid literal for Fraction: '123.5_dd'",
F, "123.5_dd")
self.assertRaisesMessage(
ValueError, "Invalid literal for Fraction: 'dd.5'",
F, "dd.5")
self.assertRaisesMessage(
ValueError, "Invalid literal for Fraction: '7_dd'",
F, "7_dd")
self.assertRaisesMessage(
ValueError, "Invalid literal for Fraction: '1/dd'",
F, "1/dd")
self.assertRaisesMessage(
ValueError, "Invalid literal for Fraction: '1/123_dd'",
F, "1/123_dd")
self.assertRaisesMessage(
ValueError, "Invalid literal for Fraction: '789edd'",
F, "789edd")
self.assertRaisesMessage(
ValueError, "Invalid literal for Fraction: '789e2_dd'",
F, "789e2_dd")
# Test catastrophic backtracking.
val = "9"*50 + "_"
self.assertRaisesMessage(