matplotlib 和 cartopy 的 tight_layout 问题

Question

我最近切换到 Matplotlib 3.3.1，我的旧脚本开始报错。我想这是cartopy的问题。这是一个最小的可重现示例

import cartopy.crs as ccrs    
fig, ax = plt.subplots(2, 2,
                       subplot_kw=dict(projection=ccrs.PlateCarree()),
                      figsize=[12,7], sharex=True, sharey=True)
plt.tight_layout()

有什么解决这个问题的建议吗？

这里我复制错误信息：

Traceback (most recent call last):

File "", line 4, in plt.tight_layout()

File "C:\Users\Vinod\anaconda3\lib\site-packages\matplotlib\cbook\deprecation.py", line 451, in wrapper return func(*args, **kwargs)

File "C:\Users\Vinod\anaconda3\lib\site-packages\matplotlib\pyplot.py", line 1490, in tight_layout gcf().tight_layout(pad=pad, h_pad=h_pad, w_pad=w_pad, rect=rect)

File "C:\Users\Vinod\anaconda3\lib\site-packages\matplotlib\cbook\deprecation.py", line 411, in wrapper return func(*inner_args, **inner_kwargs)

File "C:\Users\Vinod\anaconda3\lib\site-packages\matplotlib\figure.py", line 2613, in tight_layout kwargs = get_tight_layout_figure(

File "C:\Users\Vinod\anaconda3\lib\site-packages\matplotlib\tight_layout.py", line 303, in get_tight_layout_figure kwargs = auto_adjust_subplotpars(fig, renderer,

File "C:\Users\Vinod\anaconda3\lib\site-packages\matplotlib\tight_layout.py", line 84, in auto_adjust_subplotpars bb += [ax.get_tightbbox(renderer, for_layout_only=True)]

File "C:\Users\Vinod\anaconda3\lib\site-packages\matplotlib\axes_base.py", line 4203, in get_tightbbox bbox = a.get_tightbbox(renderer)

File "C:\Users\Vinod\anaconda3\lib\site-packages\matplotlib\artist.py", line 278, in get_tightbbox bbox = self.get_window_extent(renderer)

File "C:\Users\Vinod\anaconda3\lib\site-packages\matplotlib\patches.py", line 598, in get_window_extent return self.get_path().get_extents(self.get_transform())

File "C:\Users\Vinod\anaconda3\lib\site-packages\matplotlib\path.py", line 603, in get_extents return Bbox([xys.min(axis=0), xys.max(axis=0)])

File "C:\Users\Vinod\anaconda3\lib\site-packages\numpy\core_methods.py", line 43, in _amin return umr_minimum(a, axis, None, out, keepdims, initial, where)

ValueError: zero-size array to reduction operation minimum which has no identity

Answer 1

这是一个已知问题，已在 https://github.com/SciTools/cartopy/issues/1207 中得到解决。（确保您拥有最新版本的 cartopy 可能会解决此问题）。

与此同时，作为一种解决方法，我们注意到您可以在调用 plt.tight_layout() 之前调用 fig.canvas.draw()。

matplotlib 和 cartopy 的 tight_layout 问题

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