[SciPy-user] Re: Python number handling?
skip at pobox.com
skip at pobox.com
Fri Jul 15 09:41:05 EDT 2005
>> I'm new to python...
>> Why, why oh why did someone decide to make python do this:
>>
>> Integer case
>>
>> In [5]: 107 / 4
>> Out[5]: 26
>>
>> Float case
>>
>> In [6]: 107.0 / 4
>> Out[6]: 26.75
>>
>> I'm a bit worried that when it come to using variables, because you
>> don't declare them (eg as integer or float) python might mess up
>> division and give you the first result above rather than the second.
In recent versions of Python you have full control over truncation of
division results:
>>> from __future__ import division
>>> 107/4
26.75
>>> 107//4
26
>>> 107.0/4
26.75
>>> 107.0//4
26.0
That will eventually be the default.
I think the main reason Guido made integer division return integer results
was that that's the way C did it.
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