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Thu Aug 27 21:10:09 CEST 2015 · http://mail.python.org/pipermail/python-dev/2015-August/141364.html

* R. David Murray <rdmurray at bitdance.com> [2015-08-27 15:00:40 -0400]:
> It is possible to create a "virtual" X on an otherwise headless linux
> system, but I've never tried to do it myself.  If someone comes up
> with a recipe we could add it to the devguide chapter on running
> a buildbot.

It's usually as easy as installing Xvfb and prepending "xvfb-run" to
the command:

$ export DISPLAY=

$ python3 -m test -ugui test_tk test_ttk_guionly test_idle
[1/3] test_tk
test_tk skipped -- Tk unavailable due to TclError: couldn't connect to display ""
[2/3] test_ttk_guionly
test_ttk_guionly skipped -- Tk unavailable due to TclError: couldn't connect to display ""
[3/3] test_idle
1 test OK.
2 tests skipped:
    test_tk test_ttk_guionly

$ xvfb-run python3 -m test -ugui test_tk test_ttk_guionly test_idle
[1/3] test_tk
[2/3] test_ttk_guionly
[3/3] test_idle
All 3 tests OK.

Florian

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[Python-Dev] Testing tkinter on Linux