import cv2
import cv2.cv
 
def getCam():
 window_name='show image'
 cv2.namedWindow(window_name,cv2.WINDOW_NORMAL)
 video_cap_obj=cv2.VideoCapture(0)
 if video_cap_obj==None:
  print('video caoture error')
 if video_cap_obj.open(0)==False:
  print('open error')
 while True:
  retval,image=video_cap_obj.read()
  cv2.cv.ShowImage(window_name,cv2.cv.fromarray(image))
  if cv2.waitKey(10)==27:
   break
 video_cap_obj.release()
 
if __name__=='__main__':
 getCam()