https://docs.python.org/3/library/stdtypes.html#textseq

1. Since the str class is immutable in Python, no method of the str class is in-place. Instead, all methods of the str class returns a new copy of string.

2. \ needs to be escaped (i.e., use \\) in triple quotes.

The in Operator¶

There is no method named contains in the str class. You can either use the in