code: def get_step(self, tol):
          '''Return step at which bound falls below tolerance. '''
          return 2 * numpy.log(tol/2.)/numpy.log(self.basef get_step(self, tol):
          '''Return step at which bound falls below tolerance. '''
          return 2 * numpy.log(tol/2.)/numpy.log(self.base)
docs: Return step at which bound falls below tolerance.