Python: extract items in sublist into string

Question

I got a list like this:

[['zai4'], [' '], ['tui1'], ['jin4'], [' '], ['shi2'], ['pin3'], [' '], ['an1'], ['quan2'], [' '], ['xin4'], ['xi1'], [' ']]

how could I convert it into this kind:

zai4 tui1 jin4 shi2 pin3 an1 quan2 xin4 xi1

Thank you.

I think the unique part of my question is how to extract content from sub-list into string.

Possibly duplicate of [Convert a list of characters into a string](https://stackoverflow.com/questions/4481724/convert-a-list-of-characters-into-a-string) — Vikas Periyadath, Apr 02 '18 at 07:09
`for items in text: for item in items: new_list.append(item)`, then the new_list should be like zai4 tui1 jin4 shi2 pin3 an1 quan2 xin4 xi1. Is this correct? @Atiq — David Aksnes, Apr 02 '18 at 07:14
Assuming your list in variable `l`. I might do:` [y for x in l for y in x if y != ' ']` — atiq1589, Apr 02 '18 at 07:49
Do you want another list? or just plain string separated by space? — atiq1589, Apr 02 '18 at 07:51
Thank you so much. :) I need a plain string separated by space only. Ayodhyankit Paul's answer helps me out :) — David Aksnes, Apr 02 '18 at 07:53

score 0 · Answer 1 · answered Apr 02 '18 at 07:06

Using list comprehension and str.join

a = [['zai4'], [' '], ['tui1'], ['jin4'], [' '], ['shi2'], ['pin3'], [' '], ['an1'], ['quan2'], [' '], ['xin4'], ['xi1'], [' ']]
print(" ".join(i[0] for i in a).replace("  ", ""))

Output:

zai4 tui1 jin4 shi2 pin3 an1 quan2 xin4 xi1

score 0 · Accepted Answer · answered Apr 02 '18 at 07:11

0

Try this approach:

data=[['zai4'], [' '], ['tui1'], ['jin4'], [' '], ['shi2'], ['pin3'], [' '], ['an1'], ['quan2'], [' '], ['xin4'], ['xi1'], [' ']]



print([i[0] for i in data if i[0].isalnum()])

output:

['zai4', 'tui1', 'jin4', 'shi2', 'pin3', 'an1', 'quan2', 'xin4', 'xi1']

if you want without list then:

print(" ".join([i[0] for i in data if i[0].isalnum()]))

output:

zai4 tui1 jin4 shi2 pin3 an1 quan2 xin4 xi1

answered Apr 02 '18 at 07:11

Aaditya Ura

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Thanks for your solution. What if I want to save the output as a list form? Such as ['zai4 tui1 jin4 shi2 pin3 an1 quan2 xin4 xi1'], but not in string. – David Aksnes Apr 20 '18 at 03:43

score 0 · Answer 3 · answered Apr 02 '18 at 11:34

0

You can use unpacking:

s = [['zai4'], [' '], ['tui1'], ['jin4'], [' '], ['shi2'], ['pin3'], [' '], ['an1'], ['quan2'], [' '], ['xin4'], ['xi1'], [' ']]
new_s = ' '.join(a for [a] in s if a != ' ')

Output:

'zai4 tui1 jin4 shi2 pin3 an1 quan2 xin4 xi1'

answered Apr 02 '18 at 11:34

Ajax1234

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Python: extract items in sublist into string

3 Answers3