code: def read_from_hdx(identifier, configuration=None):
          # type: (str, Optional[Configuration]) -> Optional['User']
          
  
          user = User(configuration=configuration)
          result = user._load_from_hdx('user', identifier)
          if result:
              return user
          return None
docs: Reads the user given by identifier from HDX and returns User object
  
          Args:
              identifier (str): Identifier of user
              configuration (Optional[Configuration]): HDX configuration. Defaults to global configuration.
  
          Returns:
              Optional[User]: User object if successful read, None if not