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gh-119594: Improve pow(fraction.Fraction(), b, modulo) error message (#119593)

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If one calls pow(fractions.Fraction, x, module) with modulo not None, the error message now says that the types are incompatible rather than saying pow only takes 2 arguments.  Implemented by having fractions.Fraction __pow__ accept optional modulo argument and return NotImplemented if not None.  pow() then raises with appropriate message.
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Co-authored-by: Mark Dickinson <dickinsm@gmail.com>
This commit is contained in:
Wim Jeantine-Glenn 2024-05-29 12:46:20 -05:00 • committed by GitHub
parent bf4ff3ad2e
commit fcca08ec2f
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3 changed files with 10 additions and 1 deletions
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6
Lib/test/test_fractions.py
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@ -1633,6 +1633,12 @@ class FractionTest(unittest.TestCase):
message % ("divmod()", "complex", "Fraction"),
divmod, b, a)
def test_three_argument_pow(self):
message = "unsupported operand type(s) for ** or pow(): '%s', '%s', '%s'"
self.assertRaisesMessage(TypeError,
message % ("Fraction", "int", "int"),
pow, F(3), 4, 5)
if __name__ == '__main__':
unittest.main()