Can Default Parameters Simplify Infinitely Nested Defaultdicts?

Nested Defaultdicts: Beyond Two-Level Structures

Creating a recursive defaultdict that acts as the default for itself (an infinite-levelrecursive defaultdict) is a unique programming challenge. While third-party recipes exist to achieve this, the question arises: is there a simpler solution using default parameters?

Although the answers presented in the thread demonstrate how to construct infinitely nested defaultdicts, they do not fully address the request for a two-depth defaultdict.

An Explicit and Flexible Two-Depth Defaultdict

The following expression offers a concise and explicit way to create a two-depth defaultdict:

defaultdict(lambda: defaultdict(dict))

This construct is notable for its:

• Explicitness: The lambda function clearly defines the inner defaultdict's behavior.
• Flexibility: It allows the final layer (leaf) of the defaultdict structure to be any desired data structure, such as a list or set.

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