def get_thermal_expansion(self):
    warnings.warn('QHA.get_thermal_expansion() is deprecated.Use thermal_expansion attribute.', DeprecationWarning)
    return self.thermal_expansion
def get_thermal_expansion(self):
    warnings.warn('QHA.get_thermal_expansion() is deprecated.Use thermal_expansion attribute.', DeprecationWarning)
    return self.thermal_expansion