Python-从列表中删除重复项的方法
列表是一个重要的容器，几乎在日常编程和Web开发的每个代码中都使用列表，使用的次数更多，掌握它的需求也更多，因此必须了解其操作。从列表操作中删除重复项具有大量的应用程序，因此，其知识很好。
示例
# using naive methods# initializing list
test_list = [1, 3, 5, 6, 3, 5, 6, 1]
print ("The original list is : " + str(test_list))
# using naive method to remove duplicated from list
res = []
for i in test_list:
if i not in res:
res.append(i)
# printing list after removal
print ("The list after removing duplicates : " + str(res))
# using list comprehension
# initializing list
test_list = [1, 3, 5, 6, 3, 5, 6, 1]
print ("The original list is : " + str(test_list))
# using list comprehension to remove duplicated from list
res = []
[res.append(x) for x in test_list if x not in res]
# printing list after removal
print ("The list after removing duplicates : " + str(res))
# using set()# initializing list
test_list = [1, 5, 3, 6, 3, 5, 6, 1]
print ("The original list is : " + str(test_list))
# using set() to remove duplicated from list
test_list = list(set(test_list))
# printing list after removal
print ("The list after removing duplicates : " + str(test_list))
# using list comprehension + enumerate()# initializing list
test_list = [1, 5, 3, 6, 3, 5, 6, 1]
print ("The original list is : " + str(test_list))
# using list comprehension + enumerate() to remove duplicated from list
res = [i for n, i in enumerate(test_list) if i not in test_list[:n]]
# printing list after removal
print ("The list after removing duplicates : " + str(res))
# using collections.OrderedDict.fromkeys()
from collections import OrderedDict
# initializing list
test_list = [1, 5, 3, 6, 3, 5, 6, 1]
print ("The original list is : " + str(test_list))
# using collections.OrderedDict.fromkeys() to remove duplicated from list
res = list(OrderedDict.fromkeys(test_list))
# printing list after removal
print ("The list after removing duplicates : " + str(res))
输出结果
The original list is : [1, 3, 5, 6, 3, 5, 6, 1]The list after removing duplicates : [1, 3, 5, 6]
The original list is : [1, 3, 5, 6, 3, 5, 6, 1]
The list after removing duplicates : [1, 3, 5, 6]
The original list is : [1, 5, 3, 6, 3, 5, 6, 1]
The list after removing duplicates : [1, 3, 5, 6]
The original list is : [1, 5, 3, 6, 3, 5, 6, 1]
The list after removing duplicates : [1, 5, 3, 6]
The original list is : [1, 5, 3, 6, 3, 5, 6, 1]
The list after removing duplicates : [1, 5, 3, 6]
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