Python's collections abc invertibledict

### what is `invertibledict`?

### key features of an invertible dictionary

1. **bidirectional lookup**: you can retrieve a value using a key and also retrieve a key using a value.
2. **unique values**: in an invertible dictionary, values must be unique; otherwise, you cannot reliably look up a key based on a value.
3. **mutable**: you can add, remove, or update key-value pairs.

### creating an invertible dictionary

here’s a step-by-step example of how to implement an `invertibledict` in python.

#### step 1: import required modules

#### step 2: define invertibledict class

### step 3: using the invertibledict class

now that we have our `invertibledict` class, let’s see how to use it.

### summary

- the `invertibledict` class provides a flexible way to create a dictionary that allows for bidirectional lookups.
- you can add items, retrieve values by keys, and keys by values.
- the implementation ensures that values are unique, preventing duplicate entries.

this example should give you a solid understanding of how to implement and use an invertible dictionary in python. adjust the implementation as needed to fit your specific requirements!

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