How to reorder the keys of a dictionary?

2024/10/4 9:22:36

I have multiple dictionaries inside the list. I want to sort the dictionary with the custom key. In my case, I want to sort it using Date key. By that, I mean to move the Date key to the first position. What is the efficient way to sort the dictionary using Date key?

PS: I don't want to sort by the value of the Date.

[{"AmazonS3":6.54,"AmazonEC2":27.55,"AmazonCloudWatch":0.51,"Date":"2020-07-01"},{"AmazonEC2":27.8,"Date":"2020-07-02"},{"AmazonElastiCache":0.01,"AmazonEC2":35.34,"Date":"2020-07-03"}
]

Expected output:

...{"Date":"2020-07-03","AmazonElastiCache":0.01,"AmazonEC2":35.34}
...
Answer

If you are using a Python version that preserves key insertion order (i.e. 3.7 or newer) you can do this:

print([{"Date": di["Date"], **di} for di in my_list])
[{'Date': '2020-07-01', 'AmazonS3': 6.54, 'AmazonEC2': 27.55, 'AmazonCloudWatch': 0.51}, {'Date': '2020-07-02', 'AmazonEC2': 27.8}, {'Date': '2020-07-03', 'AmazonElastiCache': 0.01,  'AmazonEC2': 35.34}
]
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