[picamera] Solving the problem of video display using Raspberry Pi Camera

When I tried to use Raspberry Pi Camera to display video or image, I encountered a problem that there is no image frame and the GUI showed a black frame on the screen. It took me a while to figure out this issue.
    After searching the similar error on the Internet, I found it is related with using picamera library v1.11 and Python 2.7. So I try downgrading to picamera v1.10 and this should resolve the blank/black frame issue:

The linux command is as follows:
$ sudo pip uninstall picamera
$ sudo pip install 'picamera[array]'==1.10

So, it seems there are some issues with the most recent version of picamera that are causing a bunch of problems for Python 2.7 and Python 3 users.

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