Really? I always thought that we promoted the lowercase form to reduce
confusion with the python None.
On May 7, 2016 8:17 PM, "Antony Lee" notifications@github.com wrote:

The canonical "empty" linestyle is "None", not "none". The previous
implementation would raise an error after running

plot([1, 2], ls="none")

and opening the figure options editor.

You can view, comment on, or merge this pull request online at:

#6381
Commit Summary

• Fix canonical name for "None" linestyle.

File Changes

• M lib/matplotlib/backends/qt_editor/figureoptions.py
  https://github.com/matplotlib/matplotlib/pull/6381/files#diff-0 (2)

Patch Links:

• https://github.com/matplotlib/matplotlib/pull/6381.patch
• https://github.com/matplotlib/matplotlib/pull/6381.diff

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#6381

I agree that "none" would have been preferable, but both on 1.5.1 and master:

In [1]: plt.plot([1, 2], ls="none")[0].get_linestyle()
Out[1]: 'None'

Bumping.
Hopefully this can make it to 2.0? Again it should be a straight, non-controversial bug fix.
We can always switch the "canonical" none-linestyle as lowercase "none" later (which I'd prefer... modulo back-compatibility issues); we'd just need to revert this PR if that happens.

The failure on building the docs seems to be persistent, but not showing up anywhere else.

backported to v2.x as f7aa7b3