How to have open parenthesis in slider?    
   In interact slider, I can specify max and min. But the max and min are [min,max]. I want to have [min,max) in the interact slider. Is there a separate function to do so?
   @interact
    def main(x=slider(0,1,0.0000001,0.5))
          plot(tan(x), x, -pi, pi, detect_poles=True)
 
 
could you please provide your current code ?