當前的圖表和子圖可以使用plt.gcf()和plt.gca()獲得，分別表示Get Current Figure和Get Current Axes。在pyplot模塊中，許多函數都是對當前的Figure或Axes對象進行處理，比如說：plt.plot()實際上會通過plt.gca()獲得當前的Axes對象ax，然后再調用ax.plot()方法實現真正的繪圖。

引用
https://blog.csdn.net/weixin_34150224/article/details/85932238

            
              Signature: plt.gca(**kwargs)
Docstring:
Get the current :class:`~matplotlib.axes.Axes` instance on the
current figure matching the given keyword args, or create one.

Examples
--------
To get the current polar axes on the current figure::

    plt.gca(projection='polar')

If the current axes doesn't exist, or isn't a polar one, the appropriate
axes will be created and then returned.