My answer is maybe out of topic, but you could also use if or if not, which
makes things easier to read, i think (although it's probably a personal
point of view). I don't know if there is a big difference in python between
!= and is not, i guess they probably call a very similar code under the
hood, but i do know that it makes a huge difference to have a code easy to
read and to maintain ! So maybe you should just go for the easier to
maintain instead of going for the faster. If you want to do faster code,
maybe python is not the best choice.
I find
if rx and ry and rz:
easier to read than
if rx is not None and ry is not None and rz is not None
in your example, you could even do :
if all(x for x in (rx, ry, rz)):
print 'do things'
that you can extrapolate to :
if all((rx, ry, rz)):
print 'do things'
(i didn't test it, so i may have done some errors, but you get the idea ;-)
What is great with python is that if you think something would be easier to
read with the syntax you have in mind, this syntax probably works !
And anyway, i am not a developer, so maybe what i say is complete bullshit,
so is anyone has a different point of view, feel free to answer ^_^
Le lundi 25 juillet 2016 20:51:33 UTC+1, Andres Weber a écrit :
>
> Pretty succinct explanation over here which covers it nicely. Mainly one
> is just actual equality versus class/instance identity. Try not to use is
> not for things where you're trying to compare direct values.
> http://stackoverflow.com/questions/2209755/python-operation-vs-is-not
>
>
>
> On Monday, July 25, 2016 at 12:45:38 PM UTC-4, likage wrote:
>>
>> I am wondering if anyone can tell me when it is best to use *is* or *is
>> not* over *==* or *!=*
>>
>> I have this line of code:
>> if (rx != None) and (ry != None) and (rz != None):
>>
>> and I am told that it will be better to write it this way instead:
>> if (rx is not None) and (ry is not None) and (rz is not None):
>>
>> Both method will gives the same result not?
>> But why *is/is not *preferred over *!=/==?*
>>
>>
>>
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