Simple camera test for Python3 and OpenCV

teste_cam.py

import cv2
import numpy as np
'''
CAMERA TEST
'''
cam = cv2.VideoCapture(0)
ret, frame = cam.read()
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
cv2.imwrite('gray.png', gray)

cv2.namedWindow('Test display', cv2.WINDOW_NORMAL)
cv2.imshow('image', gray)
cv2.waitKey(0) # waits for Esc key to close window and end program
cv2.destroyAllWindows()

# '''
# VIDEO TEST
# '''
# import numpy as np
# import cv2

# cap = cv2.VideoCapture(0)

# while(True):
#     ret, frame = cap.read()
#     gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
#     cv2.imshow('frame',gray)
#     if cv2.waitKey(1) & 0xFF == ord('q'):
#         break
# cap.release()
# cv2.destroyAllWindows()