Apply a plotting function to each facet’s subset of the data.
将绘图函数应用于每个方面的数据子集。
参数:`func`:callable
参数:`func`:可调用
> A plotting function that takes data and keyword arguments. It must plot to the currently active matplotlib Axes and take a <cite>color</cite> keyword argument. If faceting on the <cite>hue</cite> dimension, it must also take a <cite>label</cite> keyword argument.
> Column names in self.data that identify variables with data to plot. The data for each variable is passed to <cite>func</cite> in the order the variables are specified in the call.