# Program 42: Access Value
def main():
    data = {"a": 10, "b": 20}

    key = input("Enter key: ")

    if key in data:
        print("Value:", data[key])
    else:
        print("Key not found")

main()

Enter key:  8 9 8 9 7 6


Key not found

# Program 43: Update Dictionary
def main():
    data = {"a": 10, "b": 20}

    key = input("Enter key: ")
    val = int(input("Enter value: "))

    data[key] = val

    print("Updated:", data)

main()

Enter key:  10 
Enter value:  78


Updated: {'a': 10, 'b': 20, '10 ': 78}

# Program 44: Delete Key
def main():
    data = {"a": 10, "b": 20}

    key = input("Enter key: ")

    if key in data:
        del data[key]

    print("Result:", data)

main()

Enter key:  20


Result: {'a': 10, 'b': 20}