Track 6 · Lesson 5 of 12

Dictionaries: looking things up by key

Store values under meaningful keys, read them safely with get(), and add, update and delete entries.

You will be able to

• Create a dictionary and read a value by its key
• Explain when a KeyError happens and avoid it with in or get() with a default
• Add, update and delete entries, and check the number of entries with len()
• Write functions that look up and update dictionaries without crashing on missing keys