Python Trick: Using itertools.chain to Flatten a List of Lists

How It Works:
- chain(*list_of_lists) unpacks the list of lists and chains them together into a single iterable.
- Converting the resulting iterator to a list provides the flattened list.

Why It's Cool:
- Simplicity: Provides a concise and readable way to flatten a list of lists.
- Efficiency: Uses an iterator, which is memory efficient, especially for large lists.
- Flexibility: Works with any number of input lists.

This trick is particularly useful for tasks where you need to combine multiple lists into a single list, such as preprocessing data for machine learning or consolidating results from multiple sources.

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