attribute
ufunc.nout
The number of outputs.
Data attribute containing the number of arguments the ufunc treats as output.
Since all ufuncs can take output arguments, this will always be (at least) 1.
>>> np.add.nout 1 >>> np.multiply.nout 1 >>> np.power.nout 1 >>> np.exp.nout 1
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https://docs.scipy.org/doc/numpy-1.17.0/reference/generated/numpy.ufunc.nout.html