code: def name(self) -> str:
          '''Returns the name of pvariable.
  
          Returns:
              Name of pvariable.
  
          Raises:
              ValueError: If not a pvariable expression.
          '''
          if not self.is_pvariable_expression():
              raise ValueError('Expression is not a pvariable.')
          return self._pvar_to_name(self.argsf name(self) -> str:
          '''Returns the name of pvariable.
  
          Returns:
              Name of pvariable.
  
          Raises:
              ValueError: If not a pvariable expression.
          '''
          if not self.is_pvariable_expression():
              raise ValueError('Expression is not a pvariable.')
          return self._pvar_to_name(self.args)
docs: Returns the name of pvariable.
  
          Returns:
              Name of pvariable.
  
          Raises:
              ValueError: If not a pvariable expression.