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I learn of converting a string to an integer from Python: Convert a string to an integer. But I was still wondering how this works, casting a string consisting of a number following line breaks, like '5\r\n', into int.

>>> int(' \r \n 5 \r \n ')
5

What does Python interpreter do, like this?

>>> s = ' \r \n 5 \r \n '
>>> new_s = s.strip()
>>> int(new_s)
5
Improve this question
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  • 1
    int ignores heading or trailing whitespace. This is a feature, see help(int): The literal can be preceded by '+' or '-' and be surrounded by whitespace. Commented May 17, 2016 at 1:38
  • @TigerhawkT3, I don't think my question is duplicated as Python: Convert a string to an integer. I am asking how Python interpreter does, the mechanism rather than the policy. Commented May 17, 2016 at 2:07
  • I don't think the Python interpreter messes with stripping the whitespace. It should be just ignoring it while parsing the expression. Commented May 18, 2016 at 12:56
  • 2
    If you really want to know, use the Source. Commented May 18, 2016 at 13:24
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