How to turn a list of strings into a list of lists (containing ints)-CodePudding

I want to turn this lst = ['123','456','789'] into this lst = [[1,2,3],[4,5,6],[7,8,9]]

I tried :

for i in range(len(lst)):
    lst[i] = list(lst[i])

this produced lst = [['1','2','3'],['4','5','6'],['7','8','9']]

And I don't know how to turn those string numbers into integers. How do I do it?

note - I can't use map.

CodePudding user response：

List comprehension approach:

lst = ['123', '456', '789']
lst = [[int(i) for i in string_number] for string_number in lst]

CodePudding user response：

Here is the solution:

lst = [['123'],['456'],['789']]
ans = []
temp = []

for i in lst:
    for j in i:
        temp = list(j)
        for k in range(len(temp)):
            temp[k] = int(temp[k])
        ans.append(temp)
        
print(ans)

# output - [[1, 2, 3], [4, 5, 6], [7, 8, 9]]

CodePudding user response：

well here is a simple solution for your problem:

final_list=[]
for i in lst:
    tmp_list=[]
    text=str(i[0])
    for c in text:
        tmp_list.append(int(c))
    final_list.append(tmp_list)

CodePudding user response：

lst = ['123','456','789']
for i in range(len(lst)):
    lst[i] = [int(x) for x in lst[i]]