Note that support for directly loading from urls was added in #4256 with the following motivation:

I suppose I also should have commented on the motivation here. In Python 2, you could do something like the following to download an image from the internet:
plt.imread( urllib2.urlopen(url))
I noticed that for some reason with my Linux-based Python installations, the following call signature would break in Python 3:
plt.imread(urllib.request.urlopen(url))
However, the following does work in Python 3:
plt.imread(io.BytesIO(urllib.request.urlopen(url).read()))
It seems like rather than having the users tinker with trying to get the proper call signature for their system and python version, it might be more straightforward to implement the logic in imread to handle URLs directly.

which simply doesn't apply anymore today. I would thus like to suggest at least considering deprecating this functionality.

Also, a simple inlining of the import did not clearly yield measurable improvements to import time in a quick experiment, so some measurements (not necessarily in depth) actually establishing the improvement post-inlining would be nice.

Uh oh!

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