def infix(bp, func):
 class Operator(TokenBase, ):
  lbp = bp
  def led(self, left, parser):
   self.first = left
   self.second = parser.expression(bp)
   return self
  def eval(self, context):
   try:
    return func(context, self.first, self.second)
   except Exception:
    return False
 return Operator

def infix ( bp , func ) : class Operator ( TokenBase , ) : lbp = bp def led ( self , left , parser ) : self . first = left self . second = parser . expression ( bp ) return self def eval ( self , context ) : try : return func ( context , self . first , self . second ) except Exception : return False return Operator
creates an infix operator .