>>> def find(self, num):
  l = len(self)
  first = 0
  end = l - 1
  mid = 0
  if l == 0:
   self.insert(0,num)
   return False
  while first < end:
   mid = (first + end)/2
   if num > self[mid]:
    first = mid + 1
   elif num < self[mid]:
    end = mid - 1
   else:
    break
  if first == end:
   if self[first] > num:
    self.insert(first, num)
    return False
   elif self[first] < num:
    self.insert(first + 1, num)
    return False
   else:
    return True
  elif first > end:
   self.insert(first, num)
   return False
  else:
   return True

>>> list_d = ['a','b','c','d','e','f','d','t']
>>> value_d = 't'
>>> aa=find(list_d,value_d)
>>> aa
True
>>> value_d='ha'
>>> aa=find(list_d,value_d)
>>> aa
False