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並前往https://towardsdatascience.com/python-pro-tip-start-using-python-defaultdict-and-counter-in-place-of-dictionary-d1922513f747

Python Pro Tip: Start using Python ... - Towards Data Science

The main functionality provided by a defaultdict is that it defaults a key to empty/zero if it is not found in the defaultdict . s = [('color', 'blue'), ('color ...

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