# Program 45: Dictionary Length
def main():
    data = {"a": 1, "b": 2, "c": 3}

    count = 0

    for k in data:
        count += 1

    print("Length:", count)

main()

Length: 3

# Program 46: Loop Dictionary
def main():
    data = {"a": 10, "b": 20}

    print("Items:")

    for k in data:
        print(k, data[k])

main()

Items:
a 10
b 20

# Program 47: Check Key
def main():
    data = {"x": 5, "y": 10}

    key = input("Enter key: ")

    if key in data:
        print("Exists")
    else:
        print("Not exists")

main()

Enter key:  6 7 8


Not exists