Update 7.draw_circle_rectangle.py

Author: qzQi

ch07-把鼠标当画笔/7.draw_circle_rectangle.py

@@ -48,3 +48,5 @@ def draw_circle(event, x, y, flags, param):
         mode = not mode
     elif k == ord("q"):
         break
+cv.waitKey()
+cv.destroyAllWindows()