>>> 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
