Problems following tutorials on django 1.9.2

In part 2 of the django tutorial; 'writing your fist app', the command

python manage.py makemigrations polls

gives errors. I get "ImportError: No module named polls.apps". When going back to part 1, the command 'python manage.py startapp polls' is supposed to generate also a file named apps.py in the polls/ directory, but for some strange reason it failed to do so. Since those generated .py files are mostly empty, I did "touch .../polls/apps.py" and reran that "makemigration" command above. But then I got the error message: 

ImportError: No module named PollsConfig

What now? The tutorial doesn't explain.

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