code: def _coeff_ind_from_T(self, T):
          '''Determines the index at which the coefficients for the current
          temperature are stored in `coeff_sets`.
          '''
          # DO NOT CHANGE
          if self.n == 1:
              return 0
          for i in range(self.n):
              if T <= self.Ts[i+1]:
                  return i
          return self.n - f _coeff_ind_from_T(self, T):
          '''Determines the index at which the coefficients for the current
          temperature are stored in `coeff_sets`.
          '''
          # DO NOT CHANGE
          if self.n == 1:
              return 0
          for i in range(self.n):
              if T <= self.Ts[i+1]:
                  return i
          return self.n - 1
docs: Determines the index at which the coefficients for the current
          temperature are stored in `coeff_sets`.