查找字典差异并转换结果-python3

Posted 2023-01-21

我对python世界还很陌生，到目前为止，它非常有趣，但是，在下面的用例中发现了困难，我们将提供任何帮助。

我有2个字典，它们具有相同的键但值不同，使用通过对称差异进行设置，我能够从2个字典中获取元组列表，但不确定如何将其转换为我期望的结果。

mydict1 = 
    "KMSKeyId": "arn:aws:kms:us-east-1:12345:alias/key_name",
    "Subnets": "subnet-123,subnet-456",
    "VpcId": "vpc-123",
    "Region": "us-east-1",
    "SecurityGroups": "sg-123,sg-456",
    "ProxyHost": "my-custom-proxy-us-east-1.aws.com"

mydict2 = 
    "KMSKeyId": "arn:aws:kms:us-west-1:12345:alias/key_name",
    "Subnets": "subnet-789,subnet-1011",
    "VpcId": "vpc-456",
    "SecurityGroups": "sg-789,sg-1011",
    "Region": "us-west-1",
    "ProxyHost": "my-custom-proxy-us-west-1.aws.com"

预期结果

result = 
   "us-east-1": 
      "KMSKeyId": "arn:aws:kms:us-east-1:12345:alias/key_name",
      "Subnets": "subnet-123,subnet-456",
      "VpcId": "vpc-123",
      "SecurityGroups": "sg-123,sg-456",
      "ProxyHost": "my-custom-proxy-us-east-1.aws.com"
   ,
   "us-west-1": 
      "KMSKeyId": "arn:aws:kms:us-west-1:12345:alias/key_name",
      "Subnets": "subnet-789,subnet-1011",
      "VpcId": "vpc-456",
      "SecurityGroups": "sg-789,sg-1011",
      "ProxyHost": "my-custom-proxy-us-west-1.aws.com"
   

print(list(set(mydict1.items()) ^ set(mydict2.items()))) yields ----> 
 [('SecurityGroups', 'sg-789,sg-1011'), 
  ('ProxyHost', 'my-custom-proxy-us-east-1.aws.com'), 
  ('Subnets', 'subnet-123,subnet-456'), 
  ('SecurityGroups', 'sg-123,sg-456'), 
  ('Subnets', 'subnet-789,subnet-1011'), 
  ('KMSKeyId', 'arn:aws:kms:us-west-1:12345:alias/key_name'), 
  ('Region', 'us-east-1'), 
  ('ProxyHost', 'my-custom-proxy-us-west-1.aws.com'), 
  ('VpcId', 'vpc-456'), 
  ('Region', 'us-west-1'), 
  ('KMSKeyId', 'arn:aws:kms:us-east-1:12345:alias/key_name'), 
  ('VpcId', 'vpc-123')]

从上面的元组列表中，不确定如何获得预期的结果。使用此处描述的FakeDict，https://stackoverflow.com/a/29520802/2101043能够获得具有相同键和不同值的类似dict的对象，但是，作为python的初学者，将VPC，子网和安全组映射到相应的区域似乎具有挑战性

答案

您应该能够使用：

result = 
for myMap in [mydict1, mydict2]:
    result[myMap["Region"]] = key:myMap[key] for key in myMap if key != "Region"

在打印出结果后，将为您提供所需的内容（为便于阅读而设置格式：]

    'us-east-1': 
        'KMSKeyId': 'arn:aws:kms:us-east-1:12345:alias/key_name',
        'Subnets': 'subnet-123,subnet-456',
        'VpcId': 'vpc-123',
        'SecurityGroups': 'sg-123,sg-456',
        'ProxyHost': 'my-custom-proxy-us-east-1.aws.com'
    ,
    'us-west-1': 
        'KMSKeyId': 'arn:aws:kms:us-west-1:12345:alias/key_name',
        'Subnets': 'subnet-789,subnet-1011',
        'VpcId': 'vpc-456',
        'SecurityGroups': 'sg-789,sg-1011',
        'ProxyHost': 'my-custom-proxy-us-west-1.aws.com'
    

我怀疑您可以可能用一行完成它，但是我认为将其从三行减少到一行的好处有点可疑：-）