On Sun, 5 Nov 2017 06:42 am, Stefan Ram wrote:
> What is the one way to do it?
There is no philosophy of "one way to do it" in Python, that is a
misunderstanding (possibly deliberate...) spread about by Perl users, to
contrast Python from Perl's "more than one way to do it".
The Zen of Python says:
There should be one-- and preferably only one --obvious way to do it.
The emphasis is on "obvious", not "one". There should be *at least* one, but
preferably only one, OBVIOUS way to solve any problem.
As for the question of importing names, the obvious way is to use a regular
import:
import math
y = math.cos(x)
which has the advantage of making it obvious where the name comes from, but
the disadvantage that it is more to type and involves an extra name lookup at
runtime, which is not free.
But:
- when performance matters
- or the name is very well known
- or you're only using a single name from the module (or at most a few)
- especially if it repeats the module name (e.g. fractions.Fraction)
it is acceptable to use the "from module import name" version:
from math import cos
y = cos(x)
Which you use depends on the situation and personal taste.
--
Steve
“Cheer up,” they said, “things could be worse.” So I cheered up, and sure
enough, things got worse.
--
https://mail.python.org/mailman/listinfo/python-list
