Python: Convert a string to an integer

Question

Does anybody have a quickie for converting an unsafe string to an int?

The string typically comes back as: \'234\\r\\n\' or something like

Answer 1

def str_to_int(a):
    str_to_int_output=""
    for i in range(len(a)):
        for b in range(10):
            if a[i]==str(b):
                str_to_int_output+=a[i]
    return int(str_to_int_output)

fn for "str to float" is a bit more comlicated, but i think i can do it if it is needed.

Answer 2

import re
int(re.sub(r'[^\d-]+', '', your_string))

This will strip everything except for numbers and the "-" sign. If you can be sure that there won't be ever any excess characters except for whitespace, use gruszczy's method instead.