Start iteration from second element in Python

Question

I have the next part of code in python:

for (script, location) in self.device.scripts:

How can I start to take elements from the second pair of the given list? And if that is possible where should I check if a second element exist?

consider using [python zip](https://medium.com/@happymishra66/zip-in-python-48cb4f70d013) — Sphinx, Mar 23 '18 at 22:45

score 6 · Answer 1 · answered Mar 23 '18 at 22:54

6

Just slice it.

for script, location in self.device.scripts[1:]:
    pass

For your second question, you don't need to worry about any IndexError since slicing returns an empty list when it's out of range.

answered Mar 23 '18 at 22:54

Taku

score 5 · Answer 2 · answered Mar 23 '18 at 22:48

5

Use itertools.islice() to slice skipping the first.

from itertools import islice
for (script, location) in islice(self.device.scripts, 1, None):
    pass # do stuff

answered Mar 23 '18 at 22:48

Jeff Mercado

3

It's a list, so why not just `self.device.scripts[1:]` – cs95 Mar 23 '18 at 22:50
Both ideas worked. Thank you – JoeDonald Mar 23 '18 at 22:55
2

@cᴏʟᴅsᴘᴇᴇᴅ: Why? because this works for the general case for any iterable and doesn't make a copy of the values (since it is a list), this just iterates. – Jeff Mercado Mar 23 '18 at 22:59
Just saying; you don't need a monkey-wrench to hammer a nail. – cs95 Mar 23 '18 at 23:01

2 Answers2