Python s collections abc invertibledict

### overview of `invertibledict`

an `invertibledict` is a specialized dictionary-like structure that allows for easy inversion of key-value pairs. this means you can retrieve the key from the value, which is not a standard feature of regular dictionaries. this can be useful in scenarios where you need bi-directional mapping between keys and values.

### key features

- **invertible mapping**: you can get the value associated with a key and the key associated with a value.
- **uniqueness**: both keys and values must be unique for the inversion to work correctly.

### important methods

### implementation

here’s a simple implementation of an `invertibledict` class:

### explanation

1. **initialization**: the `invertibledict` class initializes two dictionaries: `_data` to hold the key-value pairs and `_inverse` to hold the value-key pairs.
2. **item access**: the `__getitem__` method allows access to values via keys.
3. **item insertion**: the `__setitem__` method ensures that no duplicate values can be added. if a value already exists, it raises a `keyerror`.
4. **item deletion**: the `__delitem__` method removes a key-value pair and ensures the inverse mapping is also updated.
5. **inversion**: the `invert` method returns a new dictionary with inverted key-value pairs.
6. **usage**: the example demonstrates how to create an `invertibledict`, add items, access values, and handle potential errors with duplicate values.

### conclusion

the `invertibledict` cla ...

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