importmatplotlib.pyplotaspltfrommatplotlib.offsetboximportPaddedBox,AnchoredTextfig,ax=plt.subplots()at=AnchoredText("foo",'upper left')pb=PaddedBox(at,patch_attrs={'facecolor' :'r'},draw_frame=True)ax.add_artist(pb)fig.show()

Traceback (most recent call last):  File "C:\Users\Oscar\matplotlib\lib\matplotlib\backends\backend_qt.py", line 454, in _draw_idle    self.draw()  File "C:\Users\Oscar\matplotlib\lib\matplotlib\backends\backend_agg.py", line 400, in draw    self.figure.draw(self.renderer)  File "C:\Users\Oscar\matplotlib\lib\matplotlib\artist.py", line 74, in draw_wrapper    result = draw(artist, renderer, *args, **kwargs)  File "C:\Users\Oscar\matplotlib\lib\matplotlib\artist.py", line 51, in draw_wrapper    return draw(artist, renderer)  File "C:\Users\Oscar\matplotlib\lib\matplotlib\figure.py", line 3070, in draw    mimage._draw_list_compositing_images(  File "C:\Users\Oscar\matplotlib\lib\matplotlib\image.py", line 131, in _draw_list_compositing_images    a.draw(renderer)  File "C:\Users\Oscar\matplotlib\lib\matplotlib\artist.py", line 51, in draw_wrapper    return draw(artist, renderer)  File "C:\Users\Oscar\matplotlib\lib\matplotlib\axes\_base.py", line 3157, in draw    mimage._draw_list_compositing_images(  File "C:\Users\Oscar\matplotlib\lib\matplotlib\image.py", line 131, in _draw_list_compositing_images    a.draw(renderer)  File "C:\Users\Oscar\matplotlib\lib\matplotlib\offsetbox.py", line 544, in draw    w, h, xdescent, ydescent, offsets = self.get_extent_offsets(renderer)  File "C:\Users\Oscar\matplotlib\lib\matplotlib\offsetbox.py", line 537, in get_extent_offsets    pad = self.pad * dpicorTypeError: unsupported operand type(s) for *: 'NoneType' and 'float'