@pahskazan: It is correct that '\r\n' is not found in those strings, Python source code is always parsed after conversion to "Unix" line endings with "\n" between lines.  This is basicly the same as the "universal newlines" feature of the open function <https://docs.python.org/3/library/functions.html#open>.

The output you get is therefore expected behaviour. See also Raymond's note about how to use str.find() and the other typo in that line.