如何使用matplotlib为多个子图制作一个图例? [英] how do I make a single legend for many subplots with matplotlib?

问题描述

我正在绘制相同类型的信息，但是针对不同的国家，具有matplotlib的多个子图.也就是说，我在3x3网格上有9个图，所有图的线都相同(当然，每条线的值不同).

I am plotting the same type of information, but for different countries, with multiple subplots with matplotlib. That is, I have 9 plots on a 3x3 grid, all with the same for lines (of course, different values per line).

但是，我还没有弄清楚如何仅在图上放置一个图例(因为所有9个子图都有相同的行).

However, I have not figured out how to put a single legend (since all 9 subplots have the same lines) on the figure just once.

我该怎么做?

推荐答案

还有一个不错的函数get_legend_handles_labels()，您可以在最后一个轴上调用(如果您对其进行迭代)，该函数将从label=收集所需的一切参数:

There is also a nice function get_legend_handles_labels() you can call on the last axis (if you iterate over them) that would collect everything you need from label= arguments:

handles, labels = ax.get_legend_handles_labels()
fig.legend(handles, labels, loc='upper center')

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