Practical Network Automation - Second Edition

Validating an IPv4 address

This example will show us how to validate an IP address format, given as an input:

ip_address=input("Enter IP address: ")#remove any extra charactersip_address=ip_address.strip()#initialize a flag to point to true for an ip addressip_address_flag=True#validate if there are only 3 dots (.) in ip addressif (not(ip_address.count('.') == 3)):    ip_address_flag=Falseelse:    #Validate if each of the octet is in range 0 - 255    ip_address=ip_address.split(".")    for val in ip_address:        val=int(val)        if (not(0 <= val <=255)):            ip_address_flag=False#based upon the flag value display the relevant messageif (ip_address_flag):    print ("Given IP is correct")else:    print ("Given IP is not correct")

The sample output is as follows:

>> Enter ...