punch day05

"""The Python isdigit() method checks if a string consists of digits only, valid only for 0 and positive numbers.Syntax: str.isdigit()Parameters: noneReturn Value: Returns True if the string contains only numbers otherwise returns False."""str = '123456'print(str.isdigit())str = 'Hello, World!'print(str.isdigit())str = '-1'print(str.isdigit())def is_ip(ip):num_list = ip.split(".")for num in num_list:# igit means number, isdigit is to judge whether it is a number, 0 - 9 is a numberif not num.isdigit() or not 0<= int(num)<=255:return Falsereturn Trueprint(is_ip("10.289.122.55"))

Print result:

True

False
False
False