Why Your Python Functions Are Secretly Changing Data You Never Passed to Them

This story was originally published on HackerNoon at: https://hackernoon.com/why-your-python-functions-are-secretly-changing-data-you-never-passed-to-them.
Python's mutable default bug silently grows your lists across calls. Learn why it happens, how to fix it, and when it's actually intentional.
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You defined a function with a list as a default argument. Now, it's accumulating data across calls you never connected.