Passing a Python list to function, to insert into json list

Question

I am passing URLs to a filtering service. The json body I post is:

body = {
    "url-filter": [
        "www.reddit.com",
        "www.cnn.com",
        "www.espn.com"
    ]
}

I would like to create a function that will allow me to pass one or more URLs to filter. What is unclear to me is:

1) How I should pass these URLs to a function - Python list? The URLs do not need to retain order/sequence.

2) How I should insert the URLs into this json body?

Is there a function that will do this or is something more required?

Filip Happy · Accepted Answer · 2018-09-04 21:36:36Z

1

You can simply do this:

body['url-filter'].append("www.myaddress.com")

If you want to add multiple URLs, do this to add a list of URLs:

body['url-filter'] += list_of_urls

edited Sep 4, 2018 at 21:36

answered Sep 4, 2018 at 21:30

Filip Happy

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Comments

Ingo · Accepted Answer · 2018-09-04 22:38:51Z

1

You're asking two questions here, the first one is how you pass the URLs to a function, the second is how you add another URL to the list.

The code that you show is valid python code for a dictionary with one single key url-filter. So you can pass the list of URLs to a python function like this:

myfunction(body['url-filter'])

If you actually meant that body is a json encoded string, you can decode that string using json.loads like this

import json
decoded_body = json.loads(body)

and then you can pass it to a function. If you want to add another URL to the list of URLs, you can simply append that URL by `body['url-filter'].append('www.new-url.com'). This becomes a little more involved if body was actually meant to be a string. You would first want to decode the string into a python object, then append the new url and finally encode everything as json again.

def add_url(body, url):
    json_body = json.loads(body)
    json_body['url-filter'].append(url)
    return json.dumps(json_body)

edited Sep 4, 2018 at 22:38

answered Sep 4, 2018 at 21:52

Ingo

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2 Comments

Ethan Over a year ago

When I do this, I get backslashes in the json msg. Example:

Ingo Over a year ago

Where do you get backslashes when you do what?

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