Checking dictionaries for data

You can check to see if a key exists in a dictionary by using the in expression.

For example, you can check to see if 'cookies' is a key in the dictionary by using if 'cookies' in recipes_dict: this allows you to safely react to data being present in the dictionary.

You can also use the in expression so see if data is in the value of a dictionary such as if 'cookies' in recipes_dict.values(). Remember you have to handle nested dictionaries differently as illustrated in the video and previous exercises, and use the in expression on each nested dictionary.

Check to see if 2011 is in the baby_names dictionary.
- Print 'Found 2011' if it is present.
Check to see if 1 is in baby_names[2012].
- Print 'Found Rank 1 in 2012' if found and 'Rank 1 missing from 2012' if not found.
Check to see if rank 5 is in baby_names[2013].
- Print 'Found Rank 5' if it is present.

Take Hint (-30 XP)

Exercise

Checking dictionaries for data

Instructions