How to return multiple values as JSON using python 3.8?

Question

I have to save a couple of different urls in some variable and then I have to return them from AWS Lambda function using json.dumps. I am trying the below method but it's giving me the error "errorMessage": "unhashable type: 'dict'". Code is given below.

response1 = { "statusCode": 200, "message": "Audio File uploaded successfully", "Link": some_variable1}
response2 = { "statusCode": 200, "message": "Spectrograph uploaded successfully", "Link": some_variable2}
response3 = {response1, response2}
   return {
   'statusCode': 200,
   'body': json.dumps(response3)
   }

Any idea how to get it working?

falsetru · Accepted Answer · 2020-11-25 06:00:38Z

3

{response1, response2} is a set literal, which requires items to be hashable. In this case response1, response2 are dictionary which is not hashable.

>>> a_dictionary = {"statusCode": 200}
>>> {a_dictionary}
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'dict'

Instead of using set, you can use list or tuple which do not require items to be hashable.

>>> [a_dictionary]
[{'statusCode': 200}]
>>> (a_dictionary,)
({'statusCode': 200},)

response3 = [response1, response2]  # list
# or
response3 = (response1, response2)  # tuple

answered Nov 25, 2020 at 6:00

falsetru

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