Join every second element in a list of lists into a string

Question

I have a variable called result which is equal to this list [[0, ''], [1, ''], [2, ''], [3, 'x'], [4, 'x']]. I want to change that list into 'xx', so I can print that data to the screen of the player. Anyway I could do this?

My attempt so far:

res = [''.join(ele) for ele in str(result)]

Output:

['[', '[', '0', ',', ' ', "'", '', "'", ']', ',', ' ', '[', '1', ',', ' ', "'", '', "'", ']', ',', ' ', '[', '2', ',', ' ', "'", '', "'", ']', ',', ' ', '[', '3', ',', ' ', "'", 'x', "'", ']', ',', ' ', '[', '4', ',', ' ', "'", 'x', "'", ']', ']']

Did you ask this question before? I remember another question with a list of green squares like this. — Barmar, Apr 27 '22 at 19:36
Why are you putting the result inside `[]`? You say you want a string, not a list. — Barmar, Apr 27 '22 at 19:38
You wrote `res = [...]` That makes a list. But you said you want your result to be a string. — Barmar, Apr 27 '22 at 19:39
Looks like your input is actually a **string**... Where is this "result" coming from? — ddejohn, Apr 27 '22 at 19:39
@ddejohn His input isn't a string, he's turning it into a string with `str(result)` — Barmar, Apr 27 '22 at 19:39
Thanks for the help :D, someone gave a solution that worked. — Thornily, Apr 27 '22 at 19:40
Does this answer your question? [How to extract the n-th elements from a list of tuples](https://stackoverflow.com/questions/3308102/how-to-extract-the-n-th-elements-from-a-list-of-tuples) — mkrieger1, Apr 27 '22 at 19:54

Sash Sinha · Accepted Answer · 2022-04-27T19:40:35.120

3

You could use str.join with a comprehension:

>>> result = [[0, ''], [1, ''], [2, ''], [3, 'x'], [4, 'x']]
>>> result_str = ''.join(xs[1] for xs in result)
>>> result_str
'xx'

edited Apr 27 '22 at 19:40

answered Apr 27 '22 at 19:38

Sash Sinha

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Join every second element in a list of lists into a string

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