Python列表去重

1. 使用set()，是一个无序不重复元素集(重新排序)

inList = [55,21,0,3,17,17,5]
outList = list(set(inList))
print (outList)

结果：

[0,3,5,17,21,55]

2. 使用keys()方法(重新排序)

inList = [55,21,0,3,17,17,5] 
outList = list({}.fromkeys(inList).keys()) 
print (outList)

结果：

[0,3,5,17,21,55]

3. 循环遍历法(保持排序)

orgList = [55,21,0,3,17,17,5]
formatList = []
for id in orgList:
    if id not in formatList:
        formatList.append(id)
print (formatList)

结果：

[55,21,0,3,17,5]

4. 按照索引再次排序(保持排序)

orgList = [55,21,0,3,17,17,5]
formatList = list(set(orgList))
formatList.sort(key=orgList.index)
print (formatList)

结果：

[55,21,0,3,17,5]