from __future__ import annotations




def    lowerCAmelCase_ (     __A							)     ->				float:







      '''simple docstring'''


      UpperCAmelCase__								=  0.00
      UpperCAmelCase__								=  0
      for resistor in resistors:
            if resistor <= 0:
                  UpperCAmelCase__								=  f"""Resistor at index {index} has a negative or zero value!"""
                  raise ValueError(__A							)
            first_sum += 1 / float(__A							)
            index += 1
      return 1 / first_sum




def    lowerCAmelCase_ (     __A							)     ->				float:







      '''simple docstring'''


      UpperCAmelCase__								=  0.00
      UpperCAmelCase__								=  0
      for resistor in resistors:
            sum_r += resistor
            if resistor < 0:
                  UpperCAmelCase__								=  f"""Resistor at index {index} has a negative value!"""
                  raise ValueError(__A							)
            index += 1
      return sum_r


if __name__ == "__main__":
      import doctest

      doctest.testmod()









"""simple docstring"""






def      _snake_case			(				lowercase__		):
				if not isinstance(lowercase__							,    lowercase__		):
								raise ValueError('Input series is not valid, valid series - [2, 4, 6]'		)
				if len(lowercase__		) == 0:
								raise ValueError('Input list must be a non empty list'		)
				if len(lowercase__		) == 1:
								return True
				_lowerCamelCase     :			List[Any]    =    series[1] - series[0]
				for index in range(len(lowercase__		) - 1		):
								if series[index + 1] - series[index] != common_diff:
												return False
				return True







def      _snake_case			(				lowercase__		):
				if not isinstance(lowercase__							,    lowercase__		):
								raise ValueError('Input series is not valid, valid series - [2, 4, 6]'		)
				if len(lowercase__		) == 0:
								raise ValueError('Input list must be a non empty list'		)
				_lowerCamelCase     :			Optional[int]    =    0
				for val in series:
								answer += val
				return answer / len(lowercase__		)


if __name__ == "__main__":
			import doctest

			doctest.testmod()