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Evaluate .py file

It seems like basic question, but I already spent about 2 hours, tried jupyter, command line, different combinations, different commands, lots of stuff…

Basically, I have file test.py with one line of content, taken straight from docs:

 plot(graphs.HeawoodGraph()) 

I want to evaluate it, and get a picture of the plot in a browser.

What I don't want:

• to open some external app for PNG files because in future I gonna need interactivity
• to open the file in some text editor inside a browser because I already have it opened in Emacs
• to get errors about graphs being undefined because when I execute in sage terminal, it's all correctly defined.
• to search for imports to run every particular sage example from docs, because typing those examples directly in sage interactive interpreter works just fine (the examples don't include imports), so I see no reason to put an unnecessary effort over that.