Claudiu.Popa added the comment:
Right, my benchmark was indeed flawed. Here are the new results on my machine:
Without the patch
# ./python -S -m timeit -n 100000 -s "import dbm.dumb as dbm;
d=dbm.open('x.dat', 'c')" "len(d)"
100000 loops, best of 3: 0.564 usec per loop
With the patch
# ./python -S -m timeit -n 100000 -s "import dbm.dumb as dbm;
d=dbm.open('x.dat', 'c')" "len(d)"
100000 loops, best of 3: 0.857 usec per loop
Even having an empty _verify_open in __len__ method leads to this:
# ./python -S -m timeit -n 100000 -s "import dbm.dumb as dbm;
d=dbm.open('x.dat', 'c')" "len(d)"
100000 loops, best of 3: 0.749 usec per loop
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<http://bugs.python.org/issue19385>
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