Join list of lists and strings into a list

Question

I'm having an issue to join lists.

list = ['a','b',['c','d'],['e']]

I need this:

list = ['a','b','c','d','e']

This is a different question than https://stackoverflow.com/questions/952914/how-to-make-a-flat-list-out-of-list-of-lists — eumiro, Apr 26 '20 at 13:27
Dupe: [https://stackoverflow.com/questions/17864466/flatten-a-list-of-strings-and-lists-of-strings-and-lists-in-python](https://stackoverflow.com/questions/17864466/flatten-a-list-of-strings-and-lists-of-strings-and-lists-in-python) — Patrick Artner, Apr 26 '20 at 13:32

score 1 · Answer 1 · answered Apr 26 '20 at 13:24

1

Don't use the list as a variable name (it would even break my code example):

import itertools as it
items = ['a','b',['c','d'],['e']]

# in a single line:

flat = list(it.chain.from_iterable([item if isinstance(item, list) else [item] for item in items])) 

# or in several lines:
flat = []
for item in items:
    if isinstance(item, list):
        flat.extend(item)
    else:
        flat.append(item)

answered Apr 26 '20 at 13:24

eumiro

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youre right - doesnt hanle mix of strings and lists. thanks – Patrick Artner Apr 26 '20 at 13:31
Thanks, it was really helpfull .Been all night trying to figure this out – Gabriel Gomide Apr 26 '20 at 13:31
https://stackoverflow.com/questions/17864466/flatten-a-list-of-strings-and-lists-of-strings-and-lists-in-python is a dupe though. – Patrick Artner Apr 26 '20 at 13:32

Join list of lists and strings into a list

1 Answers1