def callproc(self, procname, args=()):
        """Execute stored procedure procname with args.

        :param procname: Name of procedure to execute on server.
        :type procname: str

        :param args: Sequence of parameters to use with procedure.
        :type args: tuple or list

        Returns the original args.

        Compatibility warning: PEP-249 specifies that any modified
        parameters must be returned. This is currently impossible
        as they are only available by storing them in a server
        variable and then retrieved by a query. Since stored
        procedures return zero or more result sets, there is no
        reliable way to get at OUT or INOUT parameters via callproc.
        The server variables are named @_procname_n, where procname
        is the parameter above and n is the position of the parameter
        (from zero). Once all result sets generated by the procedure
        have been fetched, you can issue a SELECT @_procname_0, ...
        query using .execute() to get any OUT or INOUT values.

        Compatibility warning: The act of calling a stored procedure
        itself creates an empty result set. This appears after any
        result sets generated by the procedure. This is non-standard
        behavior with respect to the DB-API. Be sure to use nextset()
        to advance through all result sets; otherwise you may get
        disconnected.
        """
        conn = self._get_db()
        if args:
            fmt = f"@_{procname}_%d=%s"
            self._query(
                "SET %s"
                % ",".join(
                    fmt % (index, conn.escape(arg)) for index, arg in enumerate(args)
                )
            )
            self.nextset()

        q = "CALL {}({})".format(
            procname,
            ",".join(["@_%s_%d" % (procname, i) for i in range(len(args))]),
        )
        self._query(q)
        self._executed = q
        return args
Execute stored procedure procname with args.

        :param procname: Name of procedure to execute on server.
        :type procname: str

        :param args: Sequence of parameters to use with procedure.
        :type args: tuple or list

        Returns the original args.

        Compatibility warning: PEP-249 specifies that any modified
        parameters must be returned. This is currently impossible
        as they are only available by storing them in a server
        variable and then retrieved by a query. Since stored
        procedures return zero or more result sets, there is no
        reliable way to get at OUT or INOUT parameters via callproc.
        The server variables are named @_procname_n, where procname
        is the parameter above and n is the position of the parameter
        (from zero). Once all result sets generated by the procedure
        have been fetched, you can issue a SELECT @_procname_0, ...
        query using .execute() to get any OUT or INOUT values.

        Compatibility warning: The act of calling a stored procedure
        itself creates an empty result set. This appears after any
        result sets generated by the procedure. This is non-standard
        behavior with respect to the DB-API. Be sure to use nextset()
        to advance through all result sets; otherwise you may get
        disconnected.
        
pymysql/cursors.py