Use line breaks to increase readability

[hillarygreenlerman]

https://github.com/buschbirk/intro-data-capstone-musclehub/blob/66253a292dbe1c2e164ec5b57ff40c1a6da26ecf/Final%20Analysis/musclehub.py#L213

In Python, we generally want no more than 100 characters per line. Here are a few ways of breaking up long lines of code:

1. Use \ at the end of a line to break it up:

   df['is_application'] = df.application_date\
   .apply(lambda x: 'Application' if pd.notnull(x) else 'No Application')

2. Anything within parentheses () can be broken up without a \:

   df['is_application'] = df.application_date.apply(lambda x:
   'Application' if pd.notnull(x) else 'No Application')