How to reorder the keys of a dictionary?

Question

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
   }
...

Asked By: Muhaddis

||

Source

Answer 1

You cannot sort a dictinary because dictionaries have no order.

Answered By: One Nose

Answer 2

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
  }
]

Answered By: Asocia

Answer 3

I believe you can use OrderedDict’s move_to_end to do this.

dict = OrderedDict.fromkeys("qwerty")
dict.move_to_end("t", last=False)
"".join(dict.keys())
"tqwery"

Answered By: Spaceglider

How to reorder the keys of a dictionary?

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