which is faster?

[Skaperen]

which is faster when arg1 is None?

code 1:

def fun1(arg1,arg2):
    if arg1 is None:
        return None
    . . .

code 2:

def fun1(arg1,arg2):
    if arg1 is None:
        return arg1
    . . .

[Gribouillis]

timeit: measure execution time of small code snippets

[Skaperen]

are there any examples of timing python code in a script with timeit?

[Gribouillis]

are there any examples of timing python code in a script with timeit?

Here is one, which tells you that func() executes in 0.05 microseconds. It does this by running func() one million times.

>>> def func():
...     pass
... 
>>> import timeit
>>> timeit.timeit("func()", setup="from __main__ import func")
0.05375158700189786

[Skaperen]

i'm getting about the same timing, plus or minus noise. i'll have to do the min() thing or look at the generated code (wondering how it loads that value). OTOH, if i can't tell the difference, then i guess it doesn't matter, even for a performance oriented person like me.

i wonder which is more pythonic, loading a literal or a variable that was tested as being the same.

i once coded in IBM mainframe assembly, long, long ago, i even wrote code to do a 16-bit x 16-bit multiply to get a 32-bit result that ran faster than the mainframe's own CPU instruction that did the same thing.

[Gribouillis]

i wonder which is more pythonic,

return None is more explicit. No reflection is needed to understand what it does. I think it's better.