plot_mode.py 文件源码

def _interpret_args(args):
        interval_wrong_order = "PlotInterval %s was given before any function(s)."
        interpret_error = "Could not interpret %s as a function or interval."

        functions, intervals = [], []
        if isinstance(args[0], GeometryEntity):
            for coords in list(args[0].arbitrary_point()):
                functions.append(coords)
            intervals.append(PlotInterval.try_parse(args[0].plot_interval()))
        else:
            for a in args:
                i = PlotInterval.try_parse(a)
                if i is not None:
                    if len(functions) == 0:
                        raise ValueError(interval_wrong_order % (str(i)))
                    else:
                        intervals.append(i)
                else:
                    if is_sequence(a, include=str):
                        raise ValueError(interpret_error % (str(a)))
                    try:
                        f = sympify(a)
                        functions.append(f)
                    except TypeError:
                        raise ValueError(interpret_error % str(a))

        return functions, intervals