Jupyter Notebook XVFB

from pyvirtualdisplay import Display
xephyr=Display(visible=1, size=(320, 240)).start()

from easyprocess import EasyProcess
from pyvirtualdisplay.smartdisplay import SmartDisplay
with SmartDisplay(visible=0, bgcolor='black') as disp:
    with EasyProcess('gxmessage hello'):
        img = disp.waitgrab()
img.save('screenshot.png')

//alternatively:

from easyprocess import EasyProcess
from pyvirtualdisplay.smartdisplay import SmartDisplay
with SmartDisplay(visible=0, bgcolor='black') as disp:
    with EasyProcess('pynml examples/LEMS_c302_C2_MotorToMuscleSynTest.xml') as proc:
        proc.sleep(10).stop()
        img = disp.waitgrab(timeout=300)
img.save('screenshot.png')