Python Programming: Lesson 66 - Frozen Dictionaries

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In the previous lesson (https://youtu.be/pD5tWn4VWMw), we talked about JSON objects. They are strings that wrap Python objects that we can use. Usually we're dealing with dictionaries, but we can also wrap integers, lists and tuples (into JSON array strings)

We've already talked about dictionaries and frozen sets
Review of dictionaries: https://youtu.be/lrHgG146lqQ
Review of frozen sets: https://youtu.be/5jdai5KAFMQ

A frozen dictionary is a collection of key-value pairs (dictionary) that is immutable (frozen). We will implement a frozen dictionary, considering:
1. constructor - define a frozen dictionary using a dictionary
2. length - based on dictionary
3. getitem - for square bracket referencing of a key to get a value
4. get - using get method to get a value by passing in a key
5. contains - seeing if a key is in the frozen dictionary
6. containsKey - seeing if a value is in the frozen dictionary
7. add - defines the sum of two frozen dictionaries
8. str - string representation of a frozen dictionary

1:00 Review of exec(x), iter(x), and eval(x)
5:03 Review of Techniques for Matrices
6:23 Review of JSON
10:05 NEW: Implementing a Frozen Dictionary

Ready to learn more about frozen dictionaries? We'll review all of this content and talk about a new topic (the callable function) in the next video: https://youtu.be/Dzs63wz1T2s

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