How to multiply each elements in a list in Python

Question

I want to multiply each element in my list by 2, but I got ['123123', '456456', '789789'] instead of [246, 912, 1578].

Here's my code

list = ['123', '456', '789']
my_new_list = []
for i in list:
    my_new_list.append(i*2)

print (my_new_list)

what should i change or add to the code to get [246, 912, 1578]?

`list = list(map(int, list))` or `list = [int(x) for x in list]` to do what @rdas said. — Christian Dean, Apr 07 '21 at 17:49

score 1 · Accepted Answer · answered Apr 07 '21 at 17:48

You are multiplying strings. Instead multiply integers.

list = ['123', '456', '789']
my_new_list = []
for i in list:
    my_new_list.append(int(i)*2)

print (my_new_list)

Or just make every number in list an integer. Also here is a list comprehension version of your code

list = ['123', '456', '789']
my_new_list = [int(i)*2 for i in list]

1 Answers1