numpy ufuncs don't have __qualname__

Numpy ufuncs have a __name__, but don’t have a __qualname__ as defined in PEP 3155. Similarly, they don’t seem to define a __module__. (note that for numpy’s builtin ufuncs, the __qualname__ should simply be the same as the __name__, e.g. np.sin.__qualname__ == 'sin')

[pitrou]

Well, I’m the author of the PEP.

[seberg]

__name__ attributes don’t contain periods, and __qualname__ only does so in the case of methods i.e. irrelevant in the case of ufuncs

This is not irrelevant, because a ufunc can be attached to a different object (and this can be the only place it lives). Numba does this. (It is irrelevant for NumPy or SciPy, but not generally.)