How do I get the length of the first line in a multi line string?

Question

I have a multiline string generated by a script that creates ASCII art from an image. It creates a line, then adds \r and keeps going. How do I get the length of the first line, or before it says \r without using regex? Preferably the code is fairly readable.

Answer 1

With find or index?

>>> 'abcfoo\rhahahahaha'.find('\r')
6
>>> 'abcfoo\rhahahahaha'.index('\r')
6

Answer 2

Try:

first, _, _ = s.partition('\r')
k = len(first)

If you don't need the string, you can just use index:

k = s.index('\r')

This works because s.index('\r') contains the lowest index k for which s[k] == '\r' -- this means there are exactly k characters (s[0] through s[k-1]) on the first line, before the carriage return character.