def test_sigma(self) :
for n in self.known_values :
for k in range(1, self.power_bound) :
self.assertEqual(
sum(i ** k for i in numbers.divisors(n)),
numbers.sigma(n, k)
)
def test_tau(self) :
for n in self.known_values :
self.assertEqual(len(list(numbers.divisors(n))), numbers.tau(n))