input: Write a function to create a dictionary where the keys are elements from a given list of numbers and the values are the square of those numbers. If the given 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([])=={}
  assert create_square_dict([0, -1, 2, -3])=={0: 0, -1: 1, 2: 4, -3: 9}
output: def create_square_dict(numbers):
      return {num: num**2 for num in numbers}