CAPTURING AN IMAGE FROM CAMERA USING PYTHON AND OPEN CV

import cv2
                     camera_port=0#camera number
                     camera = cv2.VideoCapture(camera_port)#simply activates the camera section
                     for i in xrange(30):        #avoides first 30 images
                         retval, f= camera.read()
                     cv2.imwrite("test1.jpg",f)
                     cv2.imshow('image',f)
                     cv2.waitKey(0)
                     cv2.destroyAllWindows()
                     del(camera)