Concatenate a list of lists in a list Python3

Question

i tried itertools,map() but i don't knoow what wrong. Ihave this:

[['>Fungi|A0A017STG4.1/69-603 UP-domain-containing protein {ECO:0000313|EMBL:EYE99555.1}', ['-', '-', '-', ... , '-', '-', '-', '-']],['>Fungi|A0A017STG4.1/69-603 UP1-domain-containing protein {ECO:0000313|EMBL:EYE99555.1}', ['-', '-', '-', ... , '-', '-', '-', '-']],['>Fungi|A0A017STG4.1/69-603 UP12-domain-containing protein {ECO:0000313|EMBL:EYE99555.1}', ['-', '-', '-', ... , '-', '-', '-', '-']]]

I want this:

[['>Fungi|A0A017STG4.1/69-603 UP-domain-containing protein {ECO:0000313|EMBL:EYE99555.1}','-', '-', '-', ... , '-', '-', '-', '-'],['>Fungi|A0A017STG4.1/69-603 UP1-domain-containing protein {ECO:0000313|EMBL:EYE99555.1}','-', '-', '-', ... , '-', '-', '-', '-'],['>Fungi|A0A017STG4.1/69-603 UP10-domain-containing protein {ECO:0000313|EMBL:EYE99555.1}','-', '-', '-', ... , '-', '-', '-', '-']]

I tried

for i in x:
    map(i,[])

and this

import itertools
a = [["a","b"], ["c"]]
print list(itertools.chain.from_iterable(a))

pls enlighten me!

Possible duplicate of Flatten (an irregular) list of lists

Jared Goguen
– Jared Goguen

2017-04-21 16:27:36 +00:00
Commented Apr 21, 2017 at 16:27 — Jared Goguen
– Jared Goguen, Commented Apr 21, 2017 at 16:27

Pedro Lobito · Accepted Answer · 2017-04-21 15:49:29Z

1

There must be better Pythonic solutions, but you can use:

n = []
for x in your_list:
    temp_list = [x[0]]
    [temp_list.append(y) for y in x[1]]
    n.append(temp_list)

print(n)

Outputs:

[['>Fungi|A0A017STG4.1/69-603 UP-domain-containing protein {ECO:0000313|EMBL:EYE99555.1}', '-', '-', '-', Ellipsis, '-', '-', '-', '-'], ['>Fungi|A0A017STG4.1/69-603 UP1-domain-containing protein {ECO:0000313|EMBL:EYE99555.1}', '-', '-', '-', Ellipsis, '-', '-', '-', '-'], ['>Fungi|A0A017STG4.1/69-603 UP12-domain-containing protein {ECO:0000313|EMBL:EYE99555.1}', '-', '-', '-', Ellipsis, '-', '-', '-', '-']]

answered Apr 21, 2017 at 15:49

Pedro Lobito

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Comments

Community · Accepted Answer · 2017-05-23 10:31:03Z

0

simple oneliner can do:

[sum(x, []) for x in yourlist]

note sum(x, []) is rather slow, so for serious list merging use more fun and lighting fast list merging techniques discussed at

join list of lists in python

for example, simple two liner is way faster

import itertools
map(list, (map(itertools.chain.from_iterable, yourlist)))

edited May 23, 2017 at 10:31

CommunityBot

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answered Apr 21, 2017 at 15:51

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