立即学习:https://edu.csdn.net/course/play/25498/304526?utm_source=blogtoedu
a[::-1]倒序
a.replace('cd','你好')
str.find('a')
str.count('a)
*list
insert
pop
[]嵌套
立即学习:https://edu.csdn.net/course/play/25498/304526?utm_source=blogtoedu
a[::-1]倒序
a.replace('cd','你好')
str.find('a')
str.count('a)
*list
insert
pop
[]嵌套