Python 3 compatibility #791
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Since python is a whitespace sensitive language, misplaced whitespace can make it unparseable. This commit fixes several places where there was bad whitespace.
[futurize](https://www.python-future.org/futurize.html) is a tool to rewrite python code so that it is compatible with both python 2 and python 3. I have visually inspected the changes and believe all of them to be correct.
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This commit updates all python code to be python2/3 compatibly using the futurize. I am unable to fully test this as OpenCV will not compile on my machine. Please inspect and test it before merging back into
master.