num = '45' # string.py

# def rect(length, width):
#   area = length * width
#   perimeter = 2 * length + 2 * width
#   return area, perimeter #2 values

# x, y = rect(50, 100) #2 variables
# print(x, y)

# def rect(d1, d2):
#   area = d1 * d2
#   perimeter = 2 * d1 + 2 * d2
#   return area, perimeter

# x, y = rect(5, 6)
# print("Area:", x)
# print("Perimeter:", y)

# word = 'motorbike'
# print(word.find('r'))

# book = "1984"
# print(len(book))

# car = {
#     'brand':'BMW',
#     'year': 2018,
#     'color': 'red',
#     'mileage': 15000
# }

# key = input("Enter a key: ")  # Prompt the user for a key

# if key in car:  # Check if the key exists in the dictionary
#     print(car[key])  # Output the corresponding value
# else:
#     print("Key not found in the dictionary.")  # Output a message if the key does not exist

# nums = (55, 44, 33, 22)
# print(nums[:2][-1])

# def test(func, arg):
#   return func(func(arg))

# def mult(x):
#   return x * x

# print(test(mult, 2))

# def pure_function(x, y):
#   temp = x + 2*y
#   return temp / (2*x + y)