text: class Switch:
      """Simple class to make the radtrans options easy."""
      _t = ["ON","on",True,1]
      _f = ["OFF","off",False,0]
      _a = _t + _f
      def __init__(self,x):
          if type(x) == type(self):
              self._x = x._x
          else:
              assert x in self._a, "value must be one of {}".format(self._a)
              self._x = x
  
      def __bool__(self):
          if self._x in self._t:
              return True
          elif self._x in self._f:
              return False
  
      def __eq__(self,other):
          if other not in self._a:
              raise NotImplementedError
          if self:
              return (other in self._t)
          else:
              return (other in self._f)
  
      def __repr__(self):
          if self:
              return "ON"
          else:
              return "OFF"
          
  if __name__=="__main__":
      on = Switch("ON")
      tr = Switch(True)
      off = Switch("OFF")
      fa = Switch(False)
      def passed(): print("passed")
      def failed(): print("failed")
      print("logic",end=" ")
      if (on==tr) and (off==fa) and (on!=off):
          passed()
      else:
          failed()
      print("repr",end=" ")
      if " ".join(map(repr,(on,off,tr,fa))) == "ON OFF ON OFF":
          passed()
      else:
          failed()
      print("construction",end=" ")
      if Switch(on) == on:
          passed()
      else:
          failed()
  
  