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Am I understanding that you’re building JSON with string interpolation? If so any special reason you wouldn’t build a dict and json.dumps() it?

When there is a multiline template, you can make it look natural within

json_doc = '''{}''' % some_dictionary

and then populate json_doc via %(some_dictionary_key)s values inside of the brackets.

I find it more readable.

Furthermore, json_doc can now live elsewhere, if sizeable, and get imported.

I guess that template strings may be the newer way to do this, but this is very backward compatible.