input: Write a function to create a dictionary where the keys are elements from a given list and the values are the squares of those elements. The function should return the dictionary.
  assert create_square_dict([1, 2, 3, 4, 5])=={1: 1, 2: 4, 3: 9, 4: 16, 5: 25}
  assert create_square_dict([0, -1, -2, 3, 4])=={0: 0, -1: 1, -2: 4, 3: 9, 4: 16}
  assert create_square_dict([])=={}
output: def create_square_dict(lst):
      return {x: x**2 for x in lst}