input: from typing import Union
  
  def convert_integer_sign(x: Union[int, float]) -> Union[int, float]:
      """ Convert a positive integer to negative or vice versa using bitwise NOT operator.
      >>> convert_integer_sign(5)
      -5
      >>> convert_integer_sign(-3)
      3
      >>> convert_integer_sign(0)
      0
      """
      if x >= 0:
          return ~x + 1
      else:
          return ~(x - 1)
output:     if x >= 0:
          return ~x + 1
      else:
          return ~(x - 1)