Write a program that prompts for a phone number of 10 digit and two dashes.

Q. Write a program that prompts for a phone number of 10 digit and two dashes , with dashes after the area code and the next three number .

Display if the phone number enter is valid format or not and display if the phone number is valid or not.

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Answer

num = input("Enter your Phone number :- ")

if len(num)== 12 :
    if num[3]== "-" :
        if num[4:7].isdigit() :
            if num [7]== "-":
                if num[ 8 : 13 ].isdigit() :
                    if num[ : 3 ].isdigit() :
                        print("It is valid number ")
                    else :
                        print("It is not valid number ")
                else :
                        print("It is not valid number ")
            else :
                    print("It is not valid number ")
        else :
                print("It is not valid number ")
    else :
            print("It is not valid number ")
else :
        print("It is not valid number ")

Output :-

Enter your Phone number :- 017-555-1212
It is valid number
>>> 

Enter your Phone number :- 654-54633-513
It is not valid number
>>> 

Enter your Phone number :- 313-456-3113
It is valid number
>>> 

Enter your Phone number :- 56-5643-25423
It is not valid number
>>> 

Enter your Phone number :- 46-3113-55313
It is not valid number
>>>