Feedback 2019 course

Below are some changes based on assisting with the practicals for the 2019 version of the Python course.

• List comprehensions should not be part of the course. They are too complex since many people already struggle with for loops.
• More general, we should only show them things in Python we want them to use. For example, we should only show them the correct with open(filename), not fp = open(filename), do_something(fp), fp.close()
• A few people had troubles with the FizzBuzz question because they did not known the elif statement exists. Should elif be added to the slides?