numpy.ufunc.identity

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.

Examples

>>> 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-1.14.5/reference/generated/numpy.ufunc.identity.html