[image] Should `Py_Is` be preferred to `==`? I consider Py_Is deadborn, like iso646.h macros or trigraphs. A change which makes Py_Is and == not equivalent will break not only CPython code, but every one Python extension. It will also likely require changing the assignment operation and compariso…

Because if Py_Is and == is no longer the same, any C code that uses == for PyObject pointers, directly or indirectly, will became incorrect. There are about 33 thousands of occurrences of == and != (not counting indirect use, like in memcmp()) in the CPython’s C code. Most of them can be between PyO…

Question about Py_Is and ==

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Lucas_Malor (Lucas Malor) December 16, 2024, 5:19pm 4

I don’t understand the quoted text. For example:

Why it will break CPython code?