[Python] Writing video in mp4 format with opencv python

i can save the video in .avi format.but i am unable to write the video in mp4 format. i m using opencv3

fourcc = cv2.VideoWriter_fourcc(*'XVID')
out = cv2.VideoWriter('output.avi',fourcc, 20.0, (640,480))


above portion of code saves the video in .avi format.

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