Message119427
PEP 378 states;
format(n, "6,f").replace(",", "X").replace(".", ",").replace("X", ".")
This is complex and relatively slow. A better technique, which IMHO the proposal should high-lighted, would be:
swap_commas_and_periods = bytes.maketrans(b',.', b'.,')
format(n, "6,f").translate(swap_commas_and_periods)
While performing the maketrans each time a string is formatted is slower than the triple replace, calling it once and caching the result is faster. I have tested with with the 3.1 interpreter; example timings follow.
>>> Timer("""
'1,234,567.89'.replace(',', 'X').replace('.', ',').replace('X', '.')
""").timeit()
3.0645400462908015
>>> Timer("""
'1,234,567.89'.translate(swap_commas_and_periods)
""", """
swap_commas_and_periods = bytes.maketrans(b',.', b'.,')
""").timeit()
2.276630409730846
>>> Timer("""
'1,234,567.89'.translate(bytes.maketrans(b',.', b'.,'))
""").timeit()
3.760715677551161 |
|
Date |
User |
Action |
Args |
2010-10-23 14:05:25 | samwyse | set | recipients:
+ samwyse, docs@python |
2010-10-23 14:05:25 | samwyse | set | messageid: <1287842725.3.0.632950856337.issue10178@psf.upfronthosting.co.za> |
2010-10-23 14:05:24 | samwyse | link | issue10178 messages |
2010-10-23 14:05:22 | samwyse | create | |
|