On 2017-11-04 19:42, Stefan Ram <[email protected]> wrote:
> What is better:
>
> ...
> import math
> ...
> ... math.cos ...
> ...
>
> or
>
> ...
> from math import cos
> ...
> ... cos ...
> ...
>
> ?
>
> (To me, the first is more readable, because at the site
> where »math.cos« is used, it is made clear that »cos«
> comes from math.
If I'm doing trigonometric computations I think the *second* is *much*
more readable. I'm using the well-known cosine function - that this was
imported from the math module is pure noise.
For other functions this may be less clear. I tend to use the first
style more often, although that gets a bit verbose sometimes
(os.path.join(os.path.dirname(...), ...)), And I do notice that the
second style seems to be preferred in Django.
> But I assume that the second might use
> one less name lookup and therefore is faster. What is the
> one way to do it?)
I'm not worried about performance unless there is clear performance
advantage (for real programs, not benchmarks).
hp
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