Christian Heimes added the comment:
Pardon?
The methods could be added to complex, too. cmath implements the methods as:
is_finite:
Py_IS_FINITE(z.real) && Py_IS_FINITE(z.imag)
is_infinite:
Py_IS_INFINITY(z.real) || Py_IS_INFINITY(z.imag)
is_nan:
Py_IS_NAN(z.real) || Py_IS_NAN(z.imag)
For numbers.Real: We can't make the methods abstractmethods because it would be
an incompatible change.
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