Python has comprehensive support for processing strings
| Method | Functionality |
|---|---|
| s.find(t) | index of first instance of string t inside s (-1 if not found) |
| s.rfind(t) | index of last instance of string t inside s (-1 if not found) |
| s.index(t) | like s.find(t) except it raises ValueError if not found |
| s.rindex(t) | like s.rfind(t) except it raises ValueError if not found |
| s.join(text) | combine the words of the text into a string using s as the glue |
| s.split(t) | split s into a list wherever a t is found (whitespace by default) |
| s.splitlines() | split s into a list of strings, one per line |
| s.lower() | a lowercased version of the string s |
| s.upper() | an uppercased version of the string s |
| s.title() | a titlecased version of the string s |
| s.strip() | a copy of s without leading or trailing whitespace |
| s.replace(t, u) | replace instances of t with u inside s |
原文：https://www.cnblogs.com/LCharles/p/10869165.html