Changing str to int in Python2

Question

time = raw_input()
if "PM" in time:
    ls = time.split(":")
    int(ls[0])
    print type(ls[0])

I have a problem on Hackerearth which I was solving. But my code here doesn't change the str to int. The output is

<type 'str'>

I want to change the first element of the time to int so i can perform mathematical calculations on it. Input it takes is

6:05:08PM

Answer 1

int() returns the integer. The variable is not changed in-place.

Assign the result:

ls[0] = int(ls[0])

Answer 2

Integer = int(ls[0])

它将str转换为一个int，然后您可以使用此Integer进行计算

Answer 3

int(ls[0])应该可以解决问题，但是请注意，这是一种不太安全的方法。