How do I check all variables returned buy the functions exists
Robin Becker
robin at reportlab.com
Wed Sep 20 03:46:00 EDT 2017
On 16/09/2017 01:58, Steve D'Aprano wrote:
........
>
> If you want to test for None specifically:
>
> if any(v is None for v in values):
> print "at least one value was None"
>
.......
for some reason that seems slow on my machine when compared with
if None in values:
.....
> C:\usr\share\robin\pythonDoc>python -m timeit -s"values=(1,2,None)" "any(v is None for v in values)"
> 1000000 loops, best of 3: 0.62 usec per loop
>
> C:\usr\share\robin\pythonDoc>python -m timeit -s"values=(None,2,None)" "any(v is None for v in values)"
> 1000000 loops, best of 3: 0.504 usec per loop
>
> C:\usr\share\robin\pythonDoc>python -m timeit -s"values=(None,2,None)" "None in values"
> 10000000 loops, best of 3: 0.0309 usec per loop
>
> C:\usr\share\robin\pythonDoc>python -m timeit -s"values=(1,2,None)" "None in values"
> 10000000 loops, best of 3: 0.097 usec per loop
it also seems a bit less obvious
--
Robin Becker
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