[英]Printing multiple specific keys from a nested dictionary in Python
好的,这只是一个大程序的一部分。
In [1]: event = {
...: "Records": [
...: {
...: "EventSource": "aws:sns",
...: "EventVersion": "1.0",
...: "EventSubscriptionArn": "arn:aws:sns:eu-XXX-1:XXXXX:aws_XXX",
...: "Sns": {
...: "Type": "Notification",
...: "MessageId": "95XXXXX-eXXX-5XXX-9XXX-4cXXXXXXX",
...: "TopicArn": "arn:aws:sns:us-XXX-1:XXXXXXX:EXXXXXTXXX",
...: "Subject": "example subject",
...: "Message": "example message",
...: "Timestamp": "1970-01-01T00:00:00.000Z",
...: "SignatureVersion": "1",
...: "Signature": "EXAMPLE",
...: "SigningCertUrl": "EXAMPLE",
...: "UnsubscribeUrl": "EXAMPLE",
...: "MessageAttributes": {
...: "Test": {"Type": "String", "Value": "TestString"},
...: "TestBinary": {"Type": "Binary", "Value": "TestBinary"},
...: },
...: },
...: }
...: ]
...: }
我可以像这样在嵌套字典 Sns 中打印单个键值:
In [29]: event["Records"][0]["Sns"]["Subject"]
Out[29]: 'example subject'
但是如何打印多个键值呢?。
以下方法失败。
In [38]: event["Records"][0]["Sns"](["Timestamp"], ["Subject"], ["Message"])
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
Input In [38], in <module>
----> 1 event["Records"][0]["Sns"](["Timestamp"], ["Subject"], ["Message"])
TypeError: 'dict' object is not callable
你在列表中得到你的值:
print([event["Records"][0]["Sns"][k] for k in ["Timestamp", "Subject", "Message"]])
在字典中:
print({k:event["Records"][0]["Sns"][k] for k in ["Timestamp", "Subject", "Message"]})
您也可以像这样解压它们:
a, b, c = [event["Records"][0]["Sns"][k] for k in ["Timestamp", "Subject", "Message"]]
在不同的行上:
for x in ("Timestamp", "Subject", "Message"):
print(event["Records"][0]["Sns"][x])
在一行上但存储为数组:
a = []
for x in ("Timestamp", "Subject", "Message"):
a.append(event["Records"][0]["Sns"][x])
print(a)
您可以运行一个 for 循环,遍历要在字典中打印多个嵌入元素的元素。
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