P4.1.3Raising an exception on $$0^0$$

Python follows the covention of many computer languages in choosing to define $$0^0=1$$ . Write a function, powr(a, b) which behaves the same as the Python expression a**b (or, for that matter, math.pow(a,b)) but raises a ValueError if a and b are both zero.

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Simply check if a and b are both zero and raise an exception if they are:

>>> def powr(a,b):
...     if a == b == 0:
...         raise ValueError('Zero to the power zero')
...     return a**b

P4.1.3Raising an exception on \(0^0\)

P4.1.3Raising an exception on $\(0^0\)$