For the use case of getting the index, use str.find (which returns -1 on failure, and has optional positional arguments): start = 0 stop = len(any_string) ... ... <看更多>

Python Find String Method Syntax 'string'.find('search string', start index, stop index) Search String ... ... <看更多>

We introduced Python's string type and a few of these methods earlier; ... If you want to find occurrences of a certain character in a string, the find() ... ... <看更多>