Stefan Behnel added the comment:
Here is another little optimisation that removes the redundant property lookups
for the denominator in __add__() and __sub__().
New profile:
5291182 function calls (5290800 primitive calls) in 3.596 seconds
Ordered by: internal time
ncalls tottime percall cumtime percall filename:lineno(function)
519632 0.843 0.000 0.843 0.000 fractions.py:17(gcd)
519644 0.800 0.000 1.709 0.000 fractions.py:73(__new__)
319744 0.520 0.000 1.816 0.000 fractions.py:408(_add)
4 0.401 0.100 3.582 0.896 bm_telco_fractions.py:38(run)
519616 0.291 0.000 3.156 0.000 fractions.py:381(forward)
199872 0.274 0.000 0.904 0.000 fractions.py:424(_mul)
520257 0.145 0.000 0.145 0.000 {built-in method isinstance}
959232 0.108 0.000 0.108 0.000 fractions.py:285(denominator)
959232 0.108 0.000 0.108 0.000 fractions.py:281(numerator)
519657 0.066 0.000 0.066 0.000 {built-in method __new__ of type
object at 0x9d1c40}
----------
Added file:
http://bugs.python.org/file36691/avoid_redundant_property_lookups.patch
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