input: Write a python function to create a dictionary where the keys are numbers from 1 to n and the values are the squares of the keys.
  assert create_square_dict(4) == {1: 1, 2: 4, 3: 9, 4: 16}
  assert create_square_dict(1) == {1: 1}
  assert create_square_dict(5) == {1: 1, 2: 4, 3: 9, 4: 16, 5: 25}
output: def create_square_dict(n):
      return {i: i**2 for i in range(1, n+1)}