Is calling str.split("a string") better than calling "a string".split()?

Question

I want to cut a string in two and I'm doing this.

parts = str.split("street one")

Would it be better to do this? Or more efficient?

parts = "street one".split()

the only time i regularly use the first style is with `str.maketrans()` for python 3 — Chris_Rands, Dec 13 '18 at 16:37
(It doesn't matter at all. Look at how the code you're working in does it and just be consistent.) — , Dec 13 '18 at 16:38
@JETM I've read the answer and yes, possibly it's something very similar to my question. I'm going to try to delete it. — RodriKing, Dec 14 '18 at 09:20

score 2 · Answer 1 · answered Dec 13 '18 at 16:40

2

Given an object obj of type Class, the following two notations are equivalent:

obj.method(arg)
Class.method(obj, arg)

So in your case, these two are equivalent:

"street one".split()
str.split("street one")

And these two are equivalent:

"street one".split(" ")
str.split("street one", " ")

answered Dec 13 '18 at 16:40

Martin Frodl

667
4
11

using `%timeit`, the two seem to be almost identical from an efficiency standpoint as well – G. Anderson Dec 13 '18 at 16:53
But, If the definition of the function is `str.split(self, separator, maxsplit):` .If you use the first way `str.split("street one")`The string that you pass to the function is passed as self? On second thought, I think the second way is better. – RodriKing Dec 14 '18 at 08:00
The string will be captured as the `self` parameter in *all* cases, even when calling `"street one".split()`. – Martin Frodl Dec 14 '18 at 08:16

score 1 · Answer 2 · answered Dec 13 '18 at 16:39

1

Both are valid, and correct, Python. So the question is simply which is stylistically preferable and more "Pythonic". I would say that the second is Pythonic and should be preferred; but the first is not "wrong".

I am not aware of any performance differences between the two forms.

answered Dec 13 '18 at 16:39

Jack Aidley

19,439
7
43
70

But, If the definition of the function is `str.split(self, separator, maxsplit):` .If you use the first way `str.split("street one")` The string that you pass to the function is passed as self? On second thought, I think the second way is better. – RodriKing Dec 14 '18 at 08:00

score 0 · Answer 3 · answered Dec 13 '18 at 17:13

0

Both of them perform the same task of splitting.i.e-> ['street','one']. Anyway you do it, it's pretty much the same

answered Dec 13 '18 at 17:13

Suvab

41
1
5

Is calling str.split("a string") better than calling "a string".split()?

3 Answers3