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?

• Joseph Sible-Reinstate Monica: Possible duplicate of How to unzip a list of tuples into individual lists?

Answer 1

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']

Answer 2

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

[a[0] for a in array]
Result:
['a', 'b', 'c', 'd', 'e']

• jose_bacoy: welc. glad to help!
• Carlos Aldair Guevara: Hey, hi again! Do you know how add an '\n' to each element?
• jose_bacoy: a[0]+'\n'. this will add a new line

Answer 3

You can use

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