Yes. The CPython hash algorithm for floats (https://github.com/python/cpython/blob/main/Python/pyhash.c#L87 https://github.com/python/cpython/blob/main/Python/p

Yes. The CPython hash algorithm for floats (https://github.com/python/cpython/blob/main/Python/pyhash.c#L87 https://github.com/python/cpython/blob/main/Python/pyhash.c#...) special-cases the non-finite values: floating-point infinities hash to special values modeled on the digits of pi (seriously! See https://github.com/python/cpython/blob/main/Include/cpython/pyhash.h#L19 https://github.com/python/cpython/blob/main/Include/cpython/...), and NaNs fall through ultimately to https://github.com/python/cpython/blob/main/Include/internal/pycore_pyhash.h#L10 https://github.com/python/cpython/blob/main/Include/internal... which is based on object identity (the pointer to the object is used rather than its data).