How to split a items inside a list, surrounded by brackets, seperated by ,

Question

I have a string of plot ploints such as:

plots = [(0, 1), (0, 2), (1, 4), ... (0.4, 0.8) etc

But I want to split them into respective x and y's:

x = (0, 0, 1, ... 0.4)
y = (1, 2, 4, ... 0.8)

I am unsure how to do this.

Welcome! So what have you tried yet? – Olvin Roght Feb 15 '20 at 08:38 — Olvin Roght, Feb 15 '20 at 08:38

Rotem Tal · Answer 1 · 2020-02-15T08:55:01.370

2

python provides you with the zip() function

x, y = zip(*plots)

which would provide your exact need, the asterisk would unpack the list into tuples, than the zip function "zips" the tuples together, that is creates a tuple for each index of the tuples

edited Feb 15 '20 at 08:55

answered Feb 15 '20 at 08:43

Rotem Tal

731
4
11

I think the OP is asking about other direction- ```unzip``` if you will. – Grzegorz Skibinski Feb 15 '20 at 08:46
1

As i've said, the asterisk would unpack the list into tuples, than the `zip()` function would zip the tuples together, which is what he wanted – Rotem Tal Feb 15 '20 at 08:47
*"that is creates a list for each index of the tuples"* - Not quite; they'll be tuples, not lists. – kaya3 Feb 15 '20 at 08:54

Artyom Vancyan · Answer 2 · 2020-02-15T08:52:00.927

1

plots = [(0, 1), (0, 2), (1, 4), (0.4, 0.8)]

x = [plot[0] for plot in plots]
y = [plot[1] for plot in plots]

edited Feb 15 '20 at 08:52

answered Feb 15 '20 at 08:46

Artyom Vancyan

2,348
3
10
28

Should I say that your `x` and `y` are lists while in question they're tuples? – Olvin Roght Feb 15 '20 at 08:50

score 0 · Answer 3 · answered Feb 15 '20 at 09:22

0

This could be an inline solution

plots = [(0, 1), (0, 2), (1, 4)]
x, y = [item[0] for item in plots], [item[1] for item in plots]

answered Feb 15 '20 at 09:22

Raihan Kabir

412
2
9

How to split a items inside a list, surrounded by brackets, seperated by ,

3 Answers3