input: Write a function to construct a dictionary where each key is a number from 1 to n and the corresponding value is the square of that number.
  
  assert create_squares_dict(10)=={1: 1, 2: 4, 3:9, 4: 16, 5: 25, 6: 36, 7: 49, 8: 64, 9: 81, 10: 100}
  assert create_squares_dict(5)=={1: 1, 2: 4, 3:9, 4: 16, 5: 25}
  assert create_squares_dict(0)=={}
  assert create_squares_dict(-5)=={}
output: def create_squares_dict(n):
      return {i: i**2 for i in range(1, n+1)}