下面的代码是简单的删除重复列表

def remove_duplicates(x):
    a = []
    for i in x:
        if i not in a:
            a.append(i)
    return a

print remove_duplicates([1,2,2,3,3,4])

它返回[1,2,3,4]

Write a Python program to create a list of numbers by taking input from the user and then remove  the duplicates from the list. You can take input of non-zero numbers, with an appropriate  prompt, from the user until the user enters a zero to create the list assuming that the numbers  are non-zero.  
Sample Input: [10, 34, 18, 10, 12, 34, 18, 20, 25, 20]  
Output: [10, 34, 18, 12, 20, 25] 

 lst = []
print("ENTER ZERO NUMBER FOR EXIT !!!!!!!!!!!!")
print("ENTER LIST ELEMENTS  :: ")
while True:
    n = int(input())
    if n == 0 :
       print("!!!!!!!!!!! EXIT !!!!!!!!!!!!")
       break
    else :
        lst.append(n)
print("LIST ELEMENR ARE :: ",lst)
#dup = set()
uniq = []
for x in lst:
    if x not in uniq:
        uniq.append(x)
       # dup.add(x)
print("UNIQUE ELEMENTS IN LIST ARE :: ",uniq)

如果你想删除重复项(就地编辑而不是返回新列表)而不使用内置set, dict，请检查此选项。键，唯一，计数器

>>> t = [1, 2, 3, 1, 2, 5, 6, 7, 8]
>>> for i in t:
...     if i in t[t.index(i)+1:]:
...         t.remove(i)
... 
>>> t
[3, 1, 2, 5, 6, 7, 8]

尝试使用集合:

import sets
t = sets.Set(['a', 'b', 'c', 'd'])
t1 = sets.Set(['a', 'b', 'c'])

print t | t1
print t - t1

简单易行:

myList = [1, 2, 3, 1, 2, 5, 6, 7, 8]
cleanlist = []
[cleanlist.append(x) for x in myList if x not in cleanlist]

输出:

>>> cleanlist 
[1, 2, 3, 5, 6, 7, 8]

与回复中列出的其他解决方案相比，下面是最快的python解决方案。

使用短路计算的实现细节允许使用列表理解，这足够快。visit .add(item)总是返回None作为结果，它被赋值为False，所以or的右边总是这样的表达式的结果。

自己计时

def deduplicate(sequence):
    visited = set()
    adder = visited.add  # get rid of qualification overhead
    out = [adder(item) or item for item in sequence if item not in visited]
    return out