How to split an array of arrays?

Question

I have this array that contains some other arrays in Python, but I need only the first elements of each mini array inside the main array. Is there some method to do that?

Example:

array = [['a','1'], ['b','2'], ['c','3'], ['d','4'], ['e','5']]

I need the letters in one row:

'a'
'b'
'c'
'd'
'e'

And the numbers in another:

'1'
'2'
'3'
'4'
'5'

can You help me with this?

Possible duplicate of [How to unzip a list of tuples into individual lists?](https://stackoverflow.com/questions/12974474/how-to-unzip-a-list-of-tuples-into-individual-lists) — Joseph Sible-Reinstate Monica, May 12 '19 at 23:44

DjaouadNM · Answer 1 · 2019-05-13T00:09:12.667

2

You can use zip to separate letters from numbers and map to convert the tuples returned by zip to lists:

array = [['a','1'], ['b','2'], ['c','3'], ['d','4'], ['e','5']]

letters, numbers = map(list, zip(*array))

print(letters)
print(numbers)

Output:

['a', 'b', 'c', 'd', 'e']
['1', '2', '3', '4', '5']

edited May 13 '19 at 00:09

answered May 12 '19 at 23:49

DjaouadNM

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score 1 · Answer 2 · answered May 12 '19 at 23:46

1

You can use comprehension. a[0] means first item in a list

[a[0] for a in array]

Result:
['a', 'b', 'c', 'd', 'e']

answered May 12 '19 at 23:46

jose_bacoy

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welc. glad to help! – jose_bacoy May 13 '19 at 00:02
Hey, hi again! Do you know how add an '\n' to each element? – Carlos Aldair Guevara May 13 '19 at 02:42
a[0]+'\n'. this will add a new line – jose_bacoy May 13 '19 at 13:30

score 1 · Answer 3 · answered May 12 '19 at 23:50

1

You can use

letters,numbers = tuple(zip(*array))

answered May 12 '19 at 23:50

Reiner Czerwinski

196
4

How to split an array of arrays?

3 Answers3