Python Dunder Methods Explained - Full Guide
Dunder methods, also called magic methods, are what let your own Python classes work with print(), ==, +, len(), sorting, indexing, and the in keyword, exactly like the built-in types. This full guide builds one class up step by step so you see each method solve a real problem.
We start with init and the gibberish you get when you print an object, then fix it with repr and str. We cover value equality with eq, the hash gotcha that comes with it, ordering with lt and the full comparison family, and operator overloading with add. Then container behavior with len, getitem, and contains, truthiness with bool, and the callable trick with call. We finish with a full operation-to-dunder map and the rules worth remembering.
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