Update Beginner Cheatsheet: fig.show → plt.show

[camriddell]

In the beginner handout, there is a brief section on how to display a given plot

https://github.com/matplotlib/cheatsheets/blob/05fbbb90103b1c68f4922096b1e7290b7dac1a17/handout-beginner.tex#L90-L95C9

I wanted to start a small discussion on whether the call to fig.show() should be replaced by plt.show.

Since this is a beginner cheatsheet, the management of a blocking GUI loop is slightly out-of-scope. fig.show does not manage this loop (whereas plt.show does), new users may wonder why their plot disappears as quickly as it appears when using fig.show.

[rougier]

I'm learning something here. I never noticed the difference but probably because I'm mostly using plt.show (and I don't remember the reason for the fig.show). Where is the difference in behavior documented ?

[timhoffm]

See the big warning box in https://matplotlib.org/stable/api/figure_api.html#matplotlib.figure.Figure.show

[rougier]

Thanks, it's quite visible actually. @camriddell Can yoiu make a PR?