Opencv learning if cv2. WaitKey (1)==word (' q ') : break the confusion-CodePudding

Here is an example of when I was in learning opencv, for if cv2. WaitKey (1)==word (' q ') : break statement is not very understanding, but I type in and out of the loop is, stop updating frames, to solve why do it? I refer to the classic online writing have cv2 waitKey (1)==word (' key ') or if cv2. WaitKey (1) & amp; 0 XFF==word (' q ') : break

 
# to open the camera and grayscale display 
The import cv2 

The capture=cv2. VideoCapture (0) 

While (True) : 
# for a frame 
Ret, frame=the capture. The read () 
# converts this frame to grayscale 
Gray=cv2. CvtColor (frame, cv2 COLOR_BGR2GRAY) 

Cv2. Imshow (' frame ', gray) 
If cv2. WaitKey (1)==word (' q ') : 
Break