How to Create Multi-Level Defaultdicts with Variable Depth?

Creating Multi-Level Defaultdicts with Variable Depth

When working with nested data, it can be challenging to create multi-level dictionaries with varying depths. This question addresses precisely this problem, where a large list with hierarchical keys needs to be converted into a nested dictionary with unknown depths.

The provided solution utilizes the power of Python's defaultdict and the lambda function to create a recursive nested dictionary on demand. The nested_dict = lambda: defaultdict(nested_dict) function returns a nested dictionary that defaults to another nested dictionary if a key is not found. This enables the dynamic creation of nested layers as needed.

In the example provided, the nest variable holds a reference to the recursive nested dictionary. The subsequent assignment nest[0][1][2][3][4][5] = 6 creates a dictionary with nested keys representing [0, 1, 2, 3, 4, 5] and assigns the value 6. The lambda function essentially creates an infinite hierarchy of defaultdicts, allowing for easy access and manipulation of nested data.

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