Waveshare 4.2inch e-Paper Module - EXPECTED RESULT (Raspberry Pi)

4.2inch e-Paper Module User Manual
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Running python2 example:
cd ~/RaspberryPi/python2 #enter example directory
sudo python main.py #running
Running python3 example:
cd ~/RaspberryPi/python3 #enter example directory
sudo python3 main.py #running
EXPECTED RESULT
After running example:
1) The screen is refresh to white
2) Display a picture
3) Draw circles and lines, text is displayed
You can press ctrl and c at the same time to stop code.