




from __future__ import annotations

UpperCamelCase__    			=			1.6021E-19  # units = C







def 	_a      (						SCREAMING_SNAKE_CASE_							:				float      ,      SCREAMING_SNAKE_CASE_							:				float      ,      SCREAMING_SNAKE_CASE_							:				float      ,      ):
					if (conductivity, electron_conc, mobility).count(0     ) != 1:
										raise ValueError("You cannot supply more or less than 2 values"     )
					elif conductivity < 0:
										raise ValueError("Conductivity cannot be negative"     )
					elif electron_conc < 0:
										raise ValueError("Electron concentration cannot be negative"     )
					elif mobility < 0:
										raise ValueError("mobility cannot be negative"     )
					elif conductivity == 0:
										return (
										    "conductivity",
										    mobility * electron_conc * ELECTRON_CHARGE,
										)
					elif electron_conc == 0:
										return (
										    "electron_conc",
										    conductivity / (mobility * ELECTRON_CHARGE),
										)
					else:
										return (
										    "mobility",
										    conductivity / (electron_conc * ELECTRON_CHARGE),
										)


if __name__ == "__main__":
					import doctest

					doctest.testmod()









"""simple docstring"""







import re

def 				UpperCamelCase_    (    lowerCAmelCase__      :				str						)						->   list:

  """simple docstring"""




  return [char.split() for char in re.split(R'[^ a-z A-Z 0-9 \s]'    ,   str_						)]

def 				UpperCamelCase_    (    lowerCAmelCase__      :				str						)						->   str:

  """simple docstring"""




  lowerCAmelCase_   :				str								= split_input(str_						)
  return "".join(
      [''.join([char.capitalize() for char in sub_str]						) for sub_str in string_split]						)

def 				UpperCamelCase_    (    lowerCAmelCase__      :				str    ,   lowerCAmelCase__      :				bool    ,   lowerCAmelCase__      :				str						)						->   str:

  """simple docstring"""




  try:
    lowerCAmelCase_   :				int								= split_input(lowerCAmelCase__						)
    if upper:
      lowerCAmelCase_   :				Optional[int]								= ''.join(
          [
              separator.join([char.upper() for char in sub_str]						)
              for sub_str in string_split
          ]						)
    else:
      lowerCAmelCase_   :				Any								= ''.join(
          [
              separator.join([char.lower() for char in sub_str]						)
              for sub_str in string_split
          ]						)
    return res_str
  except IndexError:
    return "not valid string"

def 				UpperCamelCase_    (    lowerCAmelCase__      :				str						)						->   str:

  """simple docstring"""




  return to_simple_case(lowerCAmelCase__						)

def 				UpperCamelCase_    (    lowerCAmelCase__      :				str						)						->   str:

  """simple docstring"""




  try:
    lowerCAmelCase_   :				Dict								= to_simple_case(lowerCAmelCase__						)
    return res_str[0].lower() + res_str[1:]
  except IndexError:
    return "not valid string"

def 				UpperCamelCase_    (    lowerCAmelCase__      :				str    ,   lowerCAmelCase__      :				bool						)						->   str:

  """simple docstring"""




  return to_complex_case(lowerCAmelCase__    ,   lowerCAmelCase__    ,   '_'						)

def 				UpperCamelCase_    (    lowerCAmelCase__      :				str    ,   lowerCAmelCase__      :				bool						)						->   str:

  """simple docstring"""




  return to_complex_case(lowerCAmelCase__    ,   lowerCAmelCase__    ,   '-'						)


if __name__ == "__main__":
     __import__("""doctest""").testmod()





