Скачать или смотреть Python Trick: Using setdefault to Simplify Dictionary Initialization

The setdefault method of a dictionary simplifies the initialization of dictionary keys. This is particularly useful when you need to accumulate values in a dictionary without repeatedly checking if a key exists.

How It Works:
category_dict.setdefault(category, []) ensures that category is in the dictionary, initializing it with an empty list if it doesn't exist.
append(item) adds the item to the list corresponding to the category.

Why It's Cool:
Simplicity: Eliminates the need for explicit checks and initialization of dictionary keys.
Readability: Makes the code more readable and concise by reducing boilerplate code.
Efficiency: Streamlines the process of accumulating values in a dictionary.

This trick is particularly useful for tasks like categorizing items, grouping data, or any scenario where you need to manage collections of items in a dictionary.

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