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Workout dictionary lookups

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Level: Intro (score: 1)

In this Bite you learn how to lookup values from a dictionary or in Python: dict.

You are presented with WORKOUT_SCHEDULE dict (constant) with keys = days and values = workouts (or rest up). Complete get_workout_motd that receives a day string, title case it so the function can receive case insensitive days, look it up in the dict and do two things:

If the day (key) is not in the dictionary, return INVALID_DAY, we don't want this function to continue.
If the key is in the dictionary, return CHILL_OUT or TRAIN depending if it's a REST day or not. The latter you will need to string-interpolate using format.

Also check out the docstring and tests. Have fun and keep calm and code in Python!

Update 25th of Nov 2019: previously this Bite required re-raising the KeyError, but as that's already the default behavior of a missing key in a dict, we changed the requirements to return a value instead.

dict format ternary exception handling string manipulation

Code
Tests

WORKOUT_SCHEDULE = {'Friday': 'Shoulders',
                    'Monday': 'Chest+biceps',
                    'Saturday': 'Rest',
                    'Sunday': 'Rest',
                    'Thursday': 'Legs',
                    'Tuesday': 'Back+triceps',
                    'Wednesday': 'Core'}
REST, CHILL_OUT, TRAIN = 'Rest', 'Chill out!', 'Go train {}'
INVALID_DAY = 'Not a valid day'

def get_workout_motd(day):
    """First title case the passed in day argument
       (so monday or MONDAY both result in Monday).

If day is not in WORKOUT_SCHEDULE, return INVALID_DAY

If day is in WORKOUT_SCHEDULE retrieve the value (workout)
       and return the following:
       - weekday, return TRAIN with the workout value interpolated
       - weekend day (value 'Rest'), return CHILL_OUT

Examples:
       - if day is Monday -> function returns 'Go train Chest+biceps'
       - if day is Thursday -> function returns 'Go train Legs'
       - if day is Saturday -> function returns 'Chill out!'
       - if day is nonsense -> function returns 'Not a valid day'

Trivia: /etc/motd is a file on Unix-like systems that contains
       a 'message of the day'
    """
    pass