字符串操作

name = 'His name is Louie'

print(name.captitalize()) #首字母大写

print(name.count("i")) #i的数量

print(name.ceter(50，“-”) # 打印50个-

print(name.endswith("ie") #判断string以什么结尾

print(name.expandtabs(tabsize=10) #配合string中加“”打印多少个空格 name = 'His name is Louie'

print(name.find(“n”)

print(name.format(name='Alex', year=23))  #name = “His name is {name} and i am{year} old”

print(‘ab23’.isalnum()) #包括数字和字母

isalpha() #纯英文字符

isdecimal() #十进制

isdigit() #整数判断

isidentifier() #判断合法的变量名或者标识符

islower() #小写

isspace()

print("My Name Is".istitle())#每个字符第一个是大写

isprintable() #不能打印的文件,tty file

isupper() #大写

print("Name", join("==")

print('+'.join(['1','2','3','4']))

ljust(50,'*')  #长度50不够，*补上

rjust(50,'+')

lower()

upper()

print(' Alex'.lstrip()) #去左边的空格和回车

print(' Alex '.rstrip()) 

print('      Alex '.strip())

#数字对应传递maketrans的方法,密码传递作用

p = str.maketrans("abcdef","123456")

print("Today is Python day!".translate(p))

print("Today is Python day!".replace("i","I",1))

print("Today is Python day!".rfind('i') #最右边的值的index

print("Today is Python day!".split()) #字符串分隔

print("1+2+3+4".split(“+”))

splitlines()

startswith()

endswith()

swapcase()

print("Today is Python day!".zfill(50)) #十六进制的补位用法