Moving to Python3

I've started updating course material to Python 3. The first part has already been updated, the others should follow in the coming weeks.  A lot of things need to be changed, unfortunately this means that there could be some inconsistencies until the update is completely finished.

If you come across a missing link or something else that does not work as expected, please contact me and I will do my best to fix the issue as soon as possible.

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