去除字符串两端的字符

s = "  name is jack  \n\t\v"

#去除两端的空格  \n\t\v这些也会去掉
s.strip()

#去掉两端的字符
s = "aaaabbbname is jack bbbbbbbb"
s.strip("a") --> "bbbname is jack bbbbbbbb"
s.strip("b") --> "name is jack "
s.strip()   --> "name is jack"

s.lstrip
s.rstrip