python数字和字符串的判断

Posted 2020-11-09

数字和字符串判断

type(‘9‘)

str

type(9)

int

num = ‘8asd‘

num.isdigit()   #判断是否为数字

False

num.isalpha()  #判断为纯字符

False

name = ‘debug‘ 

name.isalpha()  #判断是否为纯字符

True

number = ‘三‘

number.isdigit()

False

number.isdecimal()   #判断是否为十进制符

False

number.isnumeric()   #判断是否为数数

True

num3 = ‘3‘

num3.isdecimal()

True

num3.isdigit()

True

str_num = input(‘give me a number: ‘)

give me a number: 243242

str_num.isdigit()

True

type(str_num)

str

num = int(str_num)

type(num)

int

直接转换为数字类型 num = int(input(‘give me a number‘))

总结：判断数字范围 isnumeric > isdigit > isdecimal