def get_part(self, undefined=""):
        """
        Args:
            undefined (optional): Argument, which will be returned if the
                      `part` record is not found.

        Returns:
            str: Which part of the book series is this record or `undefined` \
                 if `part` is not found.
        """
        return _undefined_pattern(
            "".join(self.get_subfields("245", "p")),
            lambda x: x.strip() == "",
            undefined
        )
def get_part(self, undefined=""):
        
        return _undefined_pattern(
            "".join(self.get_subfields("245", "p")),
            lambda x: x.strip() == "",
            undefined
        )
def get_part ( self , undefined = "" ) : return _undefined_pattern ( "" . join ( self . get_subfields ( "245" , "p" ) ) , lambda x : x . strip ( ) == "" , undefined )
Args:
            undefined (optional): Argument, which will be returned if the
                      `part` record is not found.

        Returns:
            str: Which part of the book series is this record or `undefined` \
                 if `part` is not found.
Args : undefined ( optional ) : Argument which will be returned if the part record is not found .