code: def a(self, **kwargs):
          '''
          Returns the lattice parameter, a, in Angstroms at a given
          temperature, `T`, in Kelvin (default: 300 K).
          '''
          T = kwargs.get('T', 300.)
          return (self.a_300K(**kwargs) +
                  self.thermal_expansion(**kwargs) * (T - 300.)f a(self, **kwargs):
          '''
          Returns the lattice parameter, a, in Angstroms at a given
          temperature, `T`, in Kelvin (default: 300 K).
          '''
          T = kwargs.get('T', 300.)
          return (self.a_300K(**kwargs) +
                  self.thermal_expansion(**kwargs) * (T - 300.))
docs: Returns the lattice parameter, a, in Angstroms at a given
          temperature, `T`, in Kelvin (default: 300 K).