Update waitKey() prompts in examples 2 and 3

Author: sfe-SparkFro

examples/ex02_imread_imwrite.py

@@ -17,7 +17,10 @@
 # depend on the display driver. For example, the default ST7789 display driver
 # will crop large images, and show small images in the top-left corner
 cv2.imshow(display, img)
-key = cv2.waitKey(1000)
+
+# Prompt the user to press a key to continue
+print("Press any key to continue")
+key = cv2.waitKey(0)
 
 # Let's modify the image! Here we use `cv2.Canny()` to perform edge detection
 # on the image, which is a common operation in computer vision

examples/ex03_camera.py

@@ -13,6 +13,9 @@
 # `boot.py` script. See the example `boot.py` script for more details
 camera.open()
 
+# Prompt the user to press a key to continue
+print("Press any key to continue")
+
 # Loop to continuously read frames from the camera and display them
 while True:
     # Read a frame from the camera, just like any other Python environment! It
@@ -31,8 +34,8 @@
     # Check for key presses
     key = cv2.waitKey(1)
 
-    # If the 'q' key is pressed, exit the loop
-    if key == ord('q'):
+    # If any key is pressed, exit the loop
+    if key != -1:
         break
 
 # Release the camera, just like in any other Python environment!