add and reflected radd.
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How does a + b dispatch in Python?
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a + b first tries a.add(b); if that returns NotImplemented (or b is a subclass), Python tries the reflected b.radd(a).
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PY__radd__ makes the builtin-on-the-left case work
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Dossier 44 of 120 decoded in the Python track. One more won't hurt.