def test_derivative_pos(self):
"q. derivatives"
p1 = Polynomial([4,0,1])
self.assertEqual(p1.deriv(),Polynomial([8,0]))
self.assertEqual(p1.deriv(),Polynomial([8,0]))
self.assertEqual(Polynomial([1,2,3,0,5]).deriv(),Polynomial([4,6,6,0]))
def test_derivative_neg(self):
"r. negative derivatives"
z = Polynomial()
z[-1] = 2
w = Polynomial()
w[-2] = -2
self.assertEqual(z.deriv(), w)
