interval.py

class interval:
  def init(low, hi):
    self.low = low
    self.hi = hi
    	
 # bad version
 def intersect(oth):
 		if self.low <= oth.low:
    	if self.hi < oth.low:
      	return interval(0,0)
      elif: oth.hi <= self.hi:
    	  return self
     	else:
      	return interval(oth.min,self.max)
    elif self.hi >= oth.hi:
    	if self.low > oth.hi:
      	return interval(0,0)
      elif: oth.low >= self.low:
       	return oth 
      else:
    	   return interval(oth.max,self.min)