input: Write a function to create a dictionary that maps each number in a given list to its square. The function should take a list of numbers as input and return a dictionary where each key is a number from the list and the corresponding value is the square of that number.
  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])=={0: 0, -1: 1, -2: 4, -3: 9}
  assert create_square_dict([])=={}
  assert create_square_dict([10])=={10: 100}
  assert create_square_dict([-5, 5])=={-5: 25, 5: 25}
output: def create_square_dict(numbers):
      return {num: num**2 for num in numbers}