python从列表中删除重复的字典

Question

我有一个词典列表

l = [
{'firstname': 'joe', 'surname': 'bloggs'},
{'firstname': 'john', 'surname': 'smith'},
{'firstname': 'joe', 'surname': 'bloggs'},
{'firstname': 'jane', 'surname': 'bloggs'}
]

如何删除重复项，即{'firstname': 'joe', 'surname': 'bloggs'}出现两次，以便只显示一次？

Answer 1

这样的事情应该做的事情：

result = [dict(tupleized) for tupleized in set(tuple(item.items()) for item in l)]

首先，我在元组列表中转换初始字典，然后将它们放入一个集合（删除重复条目），然后再转换为字典。

Answer 2

import itertools

import operator

from operator import itemgetter

import pprint

l = [

{'firstname': 'joe', 'surname': 'bloggs'},

{'firstname': 'john', 'surname': 'smith'},

{'firstname': 'joe', 'surname': 'bloggs'},

{'firstname': 'jane', 'surname': 'bloggs'}

]

getvals = operator.itemgetter('firstname', 'surname')

l.sort(key=getvals)

result = []

for k, g in itertools.groupby(l, getvals):

    result.append(g.next())

l[:] = result

pprint.pprint(l)