mac M1 python

when I use gui. function create canvas? it always appear black canvas, no matter what code I type, it always shows black canvas

what happen?

python Project -/Desktop/python Project >venv : ex1.py graphics.py gui.py main.py > 24 space.py value.py e ex1 x 2 3 4 5 6 7 from graphics import graphics def main(); main() gui= graphics (500 500'canvas') gui.rectangle (200 200 188 180, 'blue') gui.draw() main() /Users/kunfengli/Desktop/python Project/venv/bin/python /Users/kunfengli/Des canvas g A V D