Q6.4.1Derivative of a polynomial

The third derivative of the polynomial function $$P(x) = 3x^3 + 2x - 7$$ is $$18$$ , so why does the following evaluate as False?

In [x]: from numpy.polynomial import Polynomial
In [x]: Polynomial((-7, 2, 0, 3)).deriv(3) == 18
Out[x]: False

Show solution

The Polynomial deriv method returns a Polynomial object (in this case with a single term, the coefficient of $$x^0$$ , equal to 18. This object is not equal to the integer object with value 18:

In [x]: Polynomial((-7, 2, 0, 3)).deriv(3)
Out[x]: Polynomial([18.], domain=[-1.,  1.], window=[-1.,  1.], symbol='x')