Convert Strings to Integers in a Python List

April 12, 2024

Here are 3 approaches to convert strings to integers in a Python list:

(1) Using a map function:

list_of_strings = ["value1", "value2", "value3", ...]

list_of_integers = list(map(int, list_of_strings))

print(list_of_integers)

For example:

list_of_strings = ["22", "45", "75", "68", "39"]

list_of_integers = list(map(int, list_of_strings))

print(list_of_integers)

The result:

[22, 45, 75, 68, 39]

(2) Using a List Comprehension:

list_of_strings = ["value1", "value2", "value3", ...]

list_of_integers = [int(i) for i in list_of_strings]

print(list_of_integers)

For example:

list_of_strings = ["22", "45", "75", "68", "39"]

list_of_integers = [int(i) for i in list_of_strings]

print(list_of_integers)

The result:

[22, 45, 75, 68, 39]

(3) Use a For Loop:

list_of_strings = ["value1", "value2", "value3", ...]

list_of_integers = []

for i in list_of_strings:
    list_of_integers.append(int(i))

print(list_of_integers)

For example:

list_of_strings = ["22", "45", "75", "68", "39"]

list_of_integers = []

for i in list_of_strings:
    list_of_integers.append(int(i))

print(list_of_integers)

The result:

[22, 45, 75, 68, 39]