def general_polynomial(self, poly):
# returns a Polynomial P such that P(x) == sum(poly(i) for i in range(1, x + 1))
p = Polynomial([], modulus=self._modulus, primitive_root=self._primitive_root)
for i, c in enumerate(poly._coef):
if c:
p.add_polynomial(self.base_polynomial(i, c))
return p
