json string format done differently [duplicate]

Question

I have 2 lists - dates and weekdays

>>> dates ['2022-02-08', '2022-02-09', '2022-02-10', '2022-02-11', '2022-02-12', '2022-02-13', '2022-02-14', '2022-02-15'] >>> weekdays ['Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday', 'Monday', 'Tuesday']

I want to create a json object that looks like this (for eg) for each element in dates.

myjson = {"label": "Tuesday-2022-02-08", "value": "/inform_date{\"date_list\": \"2022-02-08\"}"}

Basically I want to run a loop where myjson looks like what is given above.

data = [] for i in range(len(dates)): myjson = {"label": "{0}-{1}".format(weekdays[i], dates[i]), "value": "/inform_date{\"date_list\": \"{}\"}".format(dates[i])} data.append(myjson)

but I get an error when I run the above for loop.

What is the correct way to build myjson so that it looks just like shown in the example above?

inside of format strings, curly braces that you want in the output need to be "escaped" by doubling them up. f"I want this brace ->{{" — JonSG
– JonSG, Commented Feb 8, 2022 at 14:26

Corralien · Accepted Answer · 2022-02-08 15:31:01Z

Use a comprehension and f-strings:

import json data = [{'label': f"{w}-{d}", 'value': f'/inform_date{{"date_list": "{d}"}}'} for d, w in zip(dates, weekdays)] print(json.dumps(data, indent=4))

[ { "label": "Tuesday-2022-02-08", "value": "/inform_date{\"date_list\": \"2022-02-08\"}" }, { "label": "Wednesday-2022-02-09", "value": "/inform_date{\"date_list\": \"2022-02-09\"}" }, { "label": "Thursday-2022-02-10", "value": "/inform_date{\"date_list\": \"2022-02-10\"}" }, { "label": "Friday-2022-02-11", "value": "/inform_date{\"date_list\": \"2022-02-11\"}" }, { "label": "Saturday-2022-02-12", "value": "/inform_date{\"date_list\": \"2022-02-12\"}" }, { "label": "Sunday-2022-02-13", "value": "/inform_date{\"date_list\": \"2022-02-13\"}" }, { "label": "Monday-2022-02-14", "value": "/inform_date{\"date_list\": \"2022-02-14\"}" }, { "label": "Tuesday-2022-02-15", "value": "/inform_date{\"date_list\": \"2022-02-15\"}" } ]

The dates need to be in quotes too. It should be \"2022-02-08\" instead of 2022-02-08
I get 2 slashes insted on single backslash on my windows 10 machine -
>>> x = json.dumps(data) >>> x '[{"label": "Tuesday-2022-02-08", "value": "/inform_date{\\"date_list\\": \\"2022-02-08\\"}"}, {"label": "Wednesday-2022-02-09", "value": "/inform_date{\\"date_list\\": \\"2022-02-09\\"}"}, {"label": "Thursday-2022-02-10", "value": "/inform_date{\\"date_list\\": \\"2022-02-10\\"}"}, {"label": "Friday-2022-02-11", "value": "/inform_date{\\"date_list\\": \\"2022-02-11\\"}"}, {"label": "Saturday-2022-02-12", "value": "/inform_date{\\"date_list\\": \\"2022-02-12\\"}"}, ]'
Use print(x). It's just the escape mecanisem of python to display the representation of a string.

quamrana · Accepted Answer · 2022-02-08 14:21:44Z

Your second format string has 'spare' braces which need to be escaped:

myjson = {"label": "{0}-{1}".format(weekdays[i], dates[i]), "value": "/inform_date{{\"date_list\": \"{}\"}}".format(dates[i])}

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