Problems when switching matplotlib backends

[YuccaTang]

I was switching backends when using Jupyter notebook to save or display figures.

I first used matplotlib.use('inline') to display the figures, then I used matplotlib.use('agg') to save figures. It was ok even when I returned to recall matplotlib.use('inline') to show figures.

The problem is that when I first called matplotlib.use('agg') to save figures and then used matplotlib.use('inline'), the figures didn't show up. What I got was only something like <Figure size 640x480 with 1 Axes>.

By the way, if I used %matplotlib agg and %matplotlib inline instead of matplotlib.use('agg') and matplotlib.use('inline'), the switching of backends didn't cause any problems.

I attached a screenshot of demo codes for reproducing the problem.

[RRosio]

@yutang-1sec thank you for reporting this issue! Could you share which version of Notebook you are using?

A related issue from a few years ago is also open, #473, and as a workaround, a few users reported calling the line to set the backend multiple times sometimes allowed for it to take effect.
Similar issue also reported: https://stackoverflow.com/questions/41125690/matplotlib-notebook-showing-a-blank-histogram

[YuccaTang]

@yutang-1sec thank you for reporting this issue! Could you share which version of Notebook you are using?

A related issue from a few years ago is also open, #473, and as a workaround, a few users reported calling the line to set the backend multiple times sometimes allowed for it to take effect. Similar issue also reported: https://stackoverflow.com/questions/41125690/matplotlib-notebook-showing-a-blank-histogram

@RRosio The version is 7.2.1. I think it is the latest version.