input: 
  from typing import List
  
  def generate_unique_6_digit_number() -> int:
      """Generate a unique 6 digit random number within the range of 100000 to 999999.
      
      >>> generate_unique_6_digit_number()
      783462
      >>> generate_unique_6_digit_number()
      123546
      """
      return random.randint(100000, 999999)
  
  # Example usage:
  if __name__ == "__main__":
      print(generate_unique_6_digit_number())
  
output:     
      import random
      return random.randint(100000, 999999)
  