Wolfgang Maier added the comment:
Your two suggestions prompted me to do a speed comparison between them and the
result surprised me.
I tried:
import random
nums = [random.randint(0, 255) for n in range(10000000)]
then timed the simple:
for n in nums:
hx = '%X' % n # or hx = format(n, 'X')
I also tested a number of more complex formats like:
hx = '%{:02X}'.format(n) vs hx = '%%%02X' % n
In all cases, the old vs new formatting styles are rather similar in speed in
my system Python 2.7.6 (with maybe a slight advantage for the format-based
formatting).
In Python 3.5.0, however, old-style %-formatting is much speedier than under
Python 2, while new-style formatting doesn't appear to have changed much, with
the result that %-formatting is now between 30-50% faster than format-based
formatting.
So I guess my questions are:
- are my timings wrong?
and if not:
- how got %-formatting improved (generally? or for %X specifically?)
- can this speed up be transferred to format-based formatting somehow?
----------
nosy: +wolma
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<http://bugs.python.org/issue26506>
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