Write add(Directory) and delete(Directory) methods in Python to add and remove contacts using append() and pop() operations in Stack.

Q. A linear Stack called Directory contains the following information:

-- Pin code of the city

-- Name of city

Write add(Directory) and delete(Directory) methods in Python to add and remove contacts using append() and pop() operations in Stack.

Answer =

def add(Directory) :
    stack.append(Directory)
def delete() :
    stack.pop()
stack = [ ]
while True :
    print()
    print("Enter your choise as per given -")
    print("1. For insert data Enter 'insert' ")
    print("2. For delete data enter 'delete' ")
    print("3. For Exit enter 'exit' ")
    print()
    user = input("Enter your choise :- ")
    if user == "insert" :
        pin = float(input("Enter the pin :- "))
        name = input("Enter the name :- ")
        Directory = [ pin , name ]
        add(Directory)
    elif user == "delete" :
        if stack == [ ]:
            print("UnderFlow")
        else :
            delete()
    else :
        break
    print("Now our stack = ", stack)

Output :-

Enter your choice as per given -
1. For insert data Enter 'insert' 
2. For delete data enter 'delete' 
3. For Exit enter 'exit' 
Enter your choice:- insert
Enter the pin :- 231209
Enter the name :- Kanpur
Now our stack =  [[231209.0, 'Kanpur']]

Enter your choice as per given -
1. For insert data Enter 'insert' 
2. For delete data enter 'delete' 
3. For Exit enter 'exit' 
Enter your choice:- insert
Enter the pin :- 548967
Enter the name :- goa
Now our stack =  [[231209.0, 'Kanpur'], [548967.0, 'goa']]

Enter your choice as per given -
1. For insert data Enter 'insert' 
2. For delete data enter 'delete' 
3. For Exit enter 'exit' 
Enter your choice:- delete
Now our stack =  [[231209.0, 'Kanpur']]

Enter your choice as per given -
1. For insert data Enter 'insert' 
2. For delete data enter 'delete' 
3. For Exit enter 'exit' 
Enter your choice:- insert
Enter the pin :- 581436
Enter the name :- delhi
Now our stack =  [[231209.0, 'Kanpur'], [581436.0, 'delhi']]

Enter your choice as per given -
1. For insert data Enter 'insert' 
2. For delete data enter 'delete' 
3. For Exit enter 'exit' 
Enter your choice:- exit
>>>