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Minor optimization for Fractions.limit_denominator #93730

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Merged
merged 4 commits into from
Jun 21, 2022
Merged

Minor optimization for Fractions.limit_denominator #93730

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f69321c
Minor optimization for Fractions.limit_denominator
mdickinson Jun 11, 2022
9ac09a1
More efficient comparison of candidates
mdickinson Jun 12, 2022
be8c332
Fix typo in comment
mdickinson Jun 12, 2022
6f70f58
Tweak to remove an extra operation
mdickinson Jun 12, 2022
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4 changes: 2 additions & 2 deletions Lib/fractions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -247,8 +247,8 @@ def limit_denominator(self, max_denominator=1000000):
n, d = d, n-a*d

k = (max_denominator-q0)//q1
bound1 = Fraction(p0+k*p1, q0+k*q1)
bound2 = Fraction(p1, q1)
bound1 = Fraction(p0+k*p1, q0+k*q1, _normalize=False)
bound2 = Fraction(p1, q1, _normalize=False)
if abs(bound2 - self) <= abs(bound1-self):
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While you're here, can you fix-up the spacing around the operator on line 252?

return bound2
else:
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