本文参考自《python基础教程 （第二版）》
| 操作 | 语法 | 举例 | 结果 |
|
查找子串 |
find("str") 1.返回子串所在位置的最左端索引 2.没有找到返回-1 3.可以接受起始点和结束点参数，范围左闭右开 |
title = "Monty Python's Flying Circus" 1.title.find("Monty") title.find("Python") 2.title.find("Zircus") 3.title.find(“Circus”, 0, 22) #提供起始点和结束点 |
0 6 -1 -1 |
| 添加序列 |
"sep".join(seq) 1.split的逆方法 |
1.sep = "+" seq = ["1", "2", "3", "4", "5"] sep.join(seq) 2.sep = "/" dirs = ["", "usr", "bin", "env"] " sep.join(dirs) |
"1+2+3+4+5" "/usr/bin/env" |
| 分割序列 |
str.split("sep") 1.join的逆方法 |
1."1+2+3+4+5".split("+") 2."/usr/bin/env".split("/") |
["1", "2", "3", "4", "5"] ["", "usr", "bin", "env"] |
| 小写字母 | str.lower() | 1."Trondheim Hammer Dance".lower() | "trondheim hammer dance" |
| 大写字母 | str.upper() | 1."Trondheim Hammer Dance".upper() | "TRONDHEIM HAMMER DANCE" |
| 大写小写互换 | str.swapcase() |
1. "aAsmr3idd4bgs7Dlsf9eAF".swapcase() | "AaSMR3IDD4BGS7dLSF9Eaf" |
| 标题转换 | string.capwords() |
1.import string string.capwords("that's all, folks") |
"That's All, Folks" |
| 替换 | str.replace(old,new) | 1."This is a test".replace("is", "ezz") | 'Thezz ezz a test' |
|
去除空格 |
str.strip() 1.去除两侧空格（不含内部） 2.指定需要去除的字符，将它们作为参数 |
1." internall whitespace is kept ".strip() 2."*** SPAM * for * everyone!!! ***".strip(" *!") |
"internall whitespace is kept" "SPAM * for * everyone" |
|
str.lstrip() 去除左侧空格 |
1." internall whitespace is kept ".lstrip() | "internall whitespace is kept " | |
|
str.rstrip() 去除右侧空格 |
1." internall whitespace is kept ".rstrip() | " internall whitespace is kept" |