name.capitalize()  首字母大写

name.casefold()   大写全部变小写

name.center(50,"-")  输出 '---------------------Alex Li----------------------'

name.count('lex') 统计 lex出现次数

name.encode()  将字符串编码成bytes格式

name.endswith("Li")  判断字符串是否以 Li结尾

 "Alex\tLi".expandtabs(10) 输出'Alex      Li'， 将\t转换成多长的空格

 name.find('A')  查找A,找到返回其索引， 找不到返回-1 

format :

    >>> msg = "my name is {}, and age is {}"

    >>> msg.format("alex",22)

    'my name is alex, and age is 22'

    >>> msg = "my name is {1}, and age is {0}"

    >>> msg.format("alex",22)

    'my name is 22, and age is alex'

    >>> msg = "my name is {name}, and age is {age}"

    >>> msg.format(age=22,name="ale")

    'my name is ale, and age is 22'

format_map

    >>> msg.format_map({'name':'alex','age':22})

    'my name is alex, and age is 22'

msg.index('a')  返回a所在字符串的索引

'9aA'.isalnum()   True

''.isdigit() 是否整数

name.isnumeric

name.isprintable

name.isspace

name.istitle

name.isupper

 "|".join(['alex','jack','rain'])

'alex|jack|rain'

maketrans

    >>> intab = "aeiou"  #This is the string having actual characters.

    >>> outtab = "" #This is the string having corresponding mapping character

    >>> trantab = str.maketrans(intab, outtab)

    >>>

    >>> str = "this is string example....wow!!!"

    >>> str.translate(trantab)

    'th3s 3s str3ng 2x1mpl2....w4w!!!'

 msg.partition('is')   输出 ('my name ', 'is', ' {name}, and age is {age}') 

 >>> "alex li, chinese name is lijie".replace("li","LI",1)

     'alex LI, chinese name is lijie'

 msg.swapcase 大小写互换

 >>> msg.zfill(40)

'00000my name is {name}, and age is {age}'

>>> n4.ljust(40,"-")

'Hello 2orld-----------------------------'

>>> n4.rjust(40,"-")

'-----------------------------Hello 2orld'

>>> b="ddefdsdff_哈哈"

>>> b.isidentifier() #检测一段字符串可否被当作标志符，即是否符合变量命名规则

True