字符串常用操作

strip将输入信息前后空格去除

username = input("username:")
if username.strip() == 'liangml':
    print('welcome')

split

name = "liangml,tom,jack"
name2 = name.split(",") #拆分以逗号分隔的字符串得到一个列表
print('|'.join(name2))#join是将name2结果以|形式合并到一起
print(name2)

capitalize 首字母大写

print(name.capitalize())

format字符串两种赋值方式

format字符串两种赋值方式msg = "Hello,{name},It's been a long {age} since last time sopke...."
msg2 = msg.format(name="zhangsan",age=111)
print(msg2)
msg2 = "lisi{0},dddd{1}"
print(msg2.format("liangml",22))

center 将字符串两边长度均匀分开

name = 'jack,tom,zhangsan,lisi'
print(name)
print(name.center(40,'-'))

find 查找赋值中有几个

print(name.find('a'))

isdigit 判断是否为数字

age = input('your age:')
if age.isdigit():
    age = int(age)
else:
    print('Invalid data type')

isalnum 判断不允许有特殊字符，返回布尔值

name = 'liangml'
print(name.isalnum())

endswith,startswith 分别判断字符串是不是以制定字符结尾或开始，返回布尔值

print(name.endswith("ml"))
print(name.startswith('ml'))

upper、lower 全部变大、全部变小

print(name.upper())
print(name.lower())