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I am developing a GUI wxPython application for 800x480 screen resolution and below is the screen resolution that my desktop can support:

# xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 1024 x 768, maximum 1024 x 768
default connected 1024x768+0+0 0mm x 0mm
   1024x768        0.0* 
   800x600         0.0  
   640x480         0.0

How can I set programmatically screen resolution to 800x480?

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