input: Write a function to create a dictionary that contains a data structure in the form of [x:x^2] where x is the key and x^2 is the value from a given list of numbers. If the list is empty, return an empty dictionary.
  assert create_square_dict([1, 2, 3, 4, 5])=={1: 1, 2: 4, 3: 9, 4: 16, 5: 25}
  assert create_square_dict([-2, -1, 0, 1, 2])=={-2: 4, -1: 1, 0: 0, 1: 1, 2: 4}
  assert create_square_dict([])=={}
output: def create_square_dict(numbers):
      return {x: x**2 for x in numbers}