How to convert a list of string to a list of int

Question

I have this list in a list

a = [[\'1\',\'2\',\'3\',\'4\'],[\'1\',\'2\',\'3\',\'4\'],[\'1\',\'2\',\'3\',\'4\']]

but i need it to be ints , im

Answer 1

You can use a nested list comprehension like so:

a = [['1','2','3','4'],['1','2','3','4'],['1','2','3','4']]
b = [ [int(j) for j in i] for i in a]