class Window:
  def __init__(self):
    # ToDo: construct this class
    self._conductivity_wm_k = None
    self._solar_transmittance_at_normal_incidence = None
    self._front_side_solar_reflectance_at_normal_incidence = None
    self._back_side_solar_reflectance_at_normal_incidence = None
    self._frame_ratio = None
    self._thickness_m = None
    self._shgc = None

  @property
  def conductivity_wm_k(self):
    return self._conductivity_wm_k

  @conductivity_wm_k.setter
  def conductivity_wm_k(self, value):
    self._conductivity_wm_k = value

  @property
  def solar_transmittance_at_normal_incidence(self):
    return self._solar_transmittance_at_normal_incidence

  @solar_transmittance_at_normal_incidence.setter
  def solar_transmittance_at_normal_incidence(self, value):
    self._solar_transmittance_at_normal_incidence = value

  @property
  def front_side_solar_reflectance_at_normal_incidence(self):
    return self._front_side_solar_reflectance_at_normal_incidence

  @front_side_solar_reflectance_at_normal_incidence.setter
  def front_side_solar_reflectance_at_normal_incidence(self, value):
    self._front_side_solar_reflectance_at_normal_incidence = value

  @property
  def back_side_solar_reflectance_at_normal_incidence(self):
    return self._back_side_solar_reflectance_at_normal_incidence

  @back_side_solar_reflectance_at_normal_incidence.setter
  def back_side_solar_reflectance_at_normal_incidence(self, value):
    self._back_side_solar_reflectance_at_normal_incidence = value

  @property
  def frame_ratio(self):
    return self._frame_ratio

  @frame_ratio.setter
  def frame_ratio(self, value):
    self._frame_ratio = value

  @frame_ratio.setter
  def frame_ratio(self, value):
    self._frame_ratio = value

  @property
  def thickness_m(self):
    return self._thickness_m

  @thickness_m.setter
  def thickness_m(self, value):
    self._thickness_m = value

  @property
  def shgc(self):
    return self._shgc

  @shgc.setter
  def shgc(self, value):
    self._shgc = value