Update all Python examples in user guide to use best practices
There are many places in the User Guide which do not use best practices. We can try to add some more ideas to this ticket, but for right now, the use of long import statements when simple aliases can be used is something I want to clean up:
Example of verbose import statements: http://docs.h2o.ai/h2o/latest-stable/h2o-docs/data-science/stacked-ensembles.html
Since we have a lot of aliases, this can be simplified to:
Note that we should also add a blank line after the import statements and before `h2o.init()`. Also since Python 3 is the standard, we can remove the print statement line.
Let's try to add some more examples to this ticket and once it's "complete" we can start making the changes.
Please take note of the best practices here and let’s make sure they are also applied to any Python trainings you’re creating. Thanks!