List 在它的列表中查找缺席词典

我需要比较两个字典列表并检索缺席元素，“connection”是标识对象的属性。其他属性可能随时间而变化。我试着用过滤器和地图，但我还是被卡住了

输入应如下所示：

list1 = [{'username': 'user1', 'connection': "0x2083588'", 'remote': '10.0.5.251:44840','uri': 'www.google.com:443','seconds': '600'}
        ,{'username': 'user2', 'connection': "0x2a90d778'", 'remote': '10.0.5.251:44796','uri': 'mobilenetworkscoring-pa.googleapis.com:443','seconds': '600'}]


list2 = [{'username': 'user1', 'connection': "0x2083588'", 'remote': '10.0.5.251:44840','uri': 'www.google.com:443','seconds': '400'}
        ,{'username': 'user2', 'connection': "0x2a90d778'", 'remote': '10.0.5.251:44796','uri': 'mobilenetworkscoring-pa.googleapis.com:443','seconds': '400'}
        ,{'username': 'user3', 'connection': "0x2a90d678'", 'remote': '10.0.5.251:44796','uri': 'mobilenetworkscoring-pa.googleapis.com:443','seconds': '400'}]

[{'username': 'user3', 'connection': "0x2a90d678'", 'remote': '10.0.5.251:44796','uri': 'mobilenetworkscoring-pa.googleapis.com:443','seconds': '400'}]

输出应如下所示：

list1 = [{'username': 'user1', 'connection': "0x2083588'", 'remote': '10.0.5.251:44840','uri': 'www.google.com:443','seconds': '600'}
        ,{'username': 'user2', 'connection': "0x2a90d778'", 'remote': '10.0.5.251:44796','uri': 'mobilenetworkscoring-pa.googleapis.com:443','seconds': '600'}]


list2 = [{'username': 'user1', 'connection': "0x2083588'", 'remote': '10.0.5.251:44840','uri': 'www.google.com:443','seconds': '400'}
        ,{'username': 'user2', 'connection': "0x2a90d778'", 'remote': '10.0.5.251:44796','uri': 'mobilenetworkscoring-pa.googleapis.com:443','seconds': '400'}
        ,{'username': 'user3', 'connection': "0x2a90d678'", 'remote': '10.0.5.251:44796','uri': 'mobilenetworkscoring-pa.googleapis.com:443','seconds': '400'}]

[{'username': 'user3', 'connection': "0x2a90d678'", 'remote': '10.0.5.251:44796','uri': 'mobilenetworkscoring-pa.googleapis.com:443','seconds': '400'}]

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你能分享一下你作为一名教师所做的尝试吗？谢谢。在这个网站上，只有代码的答案通常是不受欢迎的。请编辑您的答案，包括一些注释或对代码的解释，好吗？解释应该回答这样的问题：它做什么？它是如何做到的？它去哪里了？它如何解决OP的问题？请参阅：。谢谢