attribute
ufunc.identity
The identity value.
Data attribute containing the identity element for the ufunc, if it has one. If it does not, the attribute value is None.
>>> np.add.identity 0 >>> np.multiply.identity 1 >>> np.power.identity 1 >>> print(np.exp.identity) None
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https://docs.scipy.org/doc/numpy-1.17.0/reference/generated/numpy.ufunc.identity.html