plot.py 文件源码

def __setitem__(self, i, args):
        """
        Parses and adds a PlotMode to the function
        list.
        """
        if not (isinstance(i, (int, Integer)) and i >= 0):
            raise ValueError("Function index must "
                             "be an integer >= 0.")

        if isinstance(args, PlotObject):
            f = args
        else:
            if (not is_sequence(args)) or isinstance(args, GeometryEntity):
                args = [args]
            if len(args) == 0:
                return  # no arguments given
            kwargs = dict(bounds_callback=self.adjust_all_bounds)
            f = PlotMode(*args, **kwargs)

        if f:
            self._render_lock.acquire()
            self._functions[i] = f
            self._render_lock.release()
        else:
            raise ValueError("Failed to parse '%s'."
                    % ', '.join(str(a) for a in args))