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. Check more stories related to programming at: https://hackernoon.com/c/programming. You can also check exclusive content about #python, #python-programming, #python-tutorials, #python-debugging, #mutable-objects, #python-functions, #bugs, #hackernoon-top-story, and more. This story was written by: @sohelalam79. Learn more about this writer by checking @sohelalam79's about page, and for more stories, please visit hackernoon.com. You defined a function with a list as a default argument. Now, it's accumulating data across calls you never connected.