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Discussion on: How to Invert a Dictionary in Python: Comprehensions, Defaultdict, and More

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Jeremy Grifski Author

Hi again! I'm in the process of updating this article, and I just realized that this answer has a minor problem. We're using a dictionary comprehension in a bad way. We're updating some external dictionary while the comprehension will also generate a dictionary (in this case, {None}). I believe that's considered bad practice, so I've added a note in the original article.