list = [111,222,333,111]
list = dict(map(lambda i: (i, 1), list)).keys()

 x = lambda a, b: (a*b)
 x(4,4) # 16

lambda i: (i, 1)

>>> z = lambda i: (i, 1)
>>> z(8)
(8, 1) # ??

>>> z = (8,1)
>>> z
(8, 1)
>>> z[0]
8
>>> z[1]
1

x = [111, 222, 333, 111]
x = dict(zip(x, x)).keys() # python 2.x
x = list(dict(zip(x, x)).keys()) # python 3.x

x = list(set(x))

 lst = [111,222,111,222,333]
 zp = zip(lst, lst)

>>> print(dict(zp).keys())
dict_keys([333, 222, 111])
>>> print(dict(zp).keys()) # повторяем
dict_keys([]) # уже пустой

>>> zip("abc", "def")
[('a', 'd'), ('b', 'e'), ('c', 'f')]
>>>

>>> la
[111, 222, 333, 111, 111, 222, 333, 111]
>>> lb = []
>>> for i in la:
...   if i not in lb:
...     lb.append(i)
... 
>>> lb
[111, 222, 333]
>>>