isFloat: Without Exception-Handling
pan-newsreader at thomas-guettler.de
Tue Sep 24 21:15:30 CEST 2002
On Fri, 20 Sep 2002 16:15:55 +0200, Mark McEahern wrote:
> [Magnus Lycka]
>> Something like this perhaps:
>> import re
>> def isFloat(S):
>> floatRE = r"^[-+]?(\d+\.?\d*|\.\d+)([eE][-+]?\d+)?$" return
>> re.match(floatRE, str(S)) is not None
>> I'm not sure it's faster though.
> If you were going to run this lots of times, you might want to compile
> the pattern. Anyway, the exception based code is faster, by my testing
> (harness at bottom):
> isFloatExcept 0.220
> isFloatRE 0.521
> isFloatRECompiled 0.400
I thought exceptions are slow. But as
someone mentioned, exception in python
seem to be different from exceptions in
java or c++.
Thank you for the performance test!
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