Fix pep8 formatting errors

[c-rhodes]

The yt_happy_or_sad.py scripts violates pep8 in several places. A list of these violations can be generated using flake8. First install flake8:

$ pip install flake8

Generate violations:

$ flake8 yt_happy_or_sad.py

This should list several errors, for instance line:

yt_happy_or_sad.py:5:80: E501 line too long (123 > 79 characters)

Edit the script and fix these errors.