两个列表之间的Python多重条件 [英] Python multiple condition between two list

问题描述

我正在使用python 3，我需要检查其他列表中的3个变量.如果username age lang与其他列表不同，我想打印数据

I'm using python 3 and I need to check 3 variables in different list. I want to print data if username age lang are different from the other list

这是我的代码:

list1 = []
list2 = []

list1.append({'username' : 'alice', 'age' : 25, 'lang' : 'IT'})
list1.append({'username' : 'carole', 'age' : 40, 'lang' : 'FR'})
list1.append({'username' : 'john', 'age' : 30, 'lang' : 'FR'})
list1.append({'username' : 'mick', 'age' : 20, 'lang' : 'US'})
list1.append({'username' : 'mick', 'age' : 30, 'lang' : 'US'})

list2.append({'username' : 'mick-c', 'age' : 30, 'lang' : 'US'})
list2.append({'username' : 'john', 'age' : 30, 'lang' : 'FR'})
list2.append({'username' : 'john-b', 'age' : 30, 'lang' : 'FR'})

for l1 in list1:
    username = l1['username']
    age = l1['age']
    lang = l1['lang']

    for l2 in list2:
        if username not in l2['username'] and l2['age'] != age and l2['lang'] != lang:
            print(str(username) + ' ' + str(age) + ' ' + str(lang))

输出:

alice 25 IT
alice 25 IT
alice 25 IT
carole 40 FR
mick 20 US
mick 20 US

我的预期输出是:

alice 25 IT
carole 40 FR
mick 20 US

如何避免循环中没有重复数据?还有另一种方法可以执行我想要的操作，而不是使用双循环吗?

How can I do to not have duplicated data in the loop ? And there is another way to do what I want instead of use double loops ?

推荐答案

您可以使用set对一个列表中的tuple元素序列进行哈希处理.当名称以list2开头时，下面的逻辑特别有用，格式可以为name-a，name-b等，并且您只对第一部分感兴趣.

You can use set to hash a sequence of tuple elements from one list. The logic below works specifically when names are in list2 can be of the format name-a, name-b, etc, and you are only interested in the first part.

from operator import itemgetter

def field_getter(x):
    i, j, k = itemgetter('username', 'age', 'lang')(x)
    return i.split('-')[0], j, k

item_set = set(map(field_getter, list2))

for d in list1:
    d_fields = field_getter(d)
    if field_getter(d) not in item_set:
        print(*d_fields)

alice 25 IT
carole 40 FR
mick 20 US

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