How to Convert URL Parameter to JSON (dict) in Python With Concise Codes

Question

I have a URL with JSON encoded parameters:

http://host/endpoint?cart%5B4887%5D=3&cart%5B2576%5D=2&cart%5B2519%5D=4

After using unquote(request.url) (Flask), I got:

http://host/endpoint?cart[4887]=3&cart[2576]=2&cart[2519]=4

This URL comes from a .php function of WordPress plugin. The reason to use GET with URL parameters instead of POST is because I need to send data to an external API by my plugin without touching / modifying any existing files in WordPress. In the existing files in WordPress, the .php file has specified what wp endpoint to post in .

$cart_items_arr = array("4887"=>3, "2576"=>2, "2519"=4);
$url = add_query_arg( array("cart" => $cart_items_arr), URL);

The output that I want to extract from the URL is

{
  "4887": 3,
  "2576": 2,
  "2519": 4
}

What would be the neat and tidy way to convert a string to dictionary like this?

Those are not JSON-encoded parameters.

deceze
– deceze ♦

2019-06-27 15:22:29 +00:00
Commented Jun 27, 2019 at 15:22 — deceze
– deceze ♦, Commented Jun 27, 2019 at 15:22
Where does your URL string comes from?

ssoler
– ssoler

2019-06-27 15:42:55 +00:00
Commented Jun 27, 2019 at 15:42 — ssoler
– ssoler, Commented Jun 27, 2019 at 15:42

peter554 · Accepted Answer · 2019-06-29 07:48:24Z

1

You could use potentially use regex to get you most of the way:

import re
str = 'http://host/endpoint?cart[4887]=3&cart[2576]=2&cart[2519]=4'
re.findall("\[(\d+)\]=(\d+)", str) # [('4887', '3'), ('2576', '2'), ('2519', '4')]

You should be able to easily map that into the dictionary you need.

edited Jun 29, 2019 at 7:48

answered Jun 27, 2019 at 20:56

peter554

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Comments

LiuXiMin · Accepted Answer · 2019-06-29 09:26:22Z

1

Looks cart is consistent, then you can just use a loop to strip them:

{k.strip('cart[]'): v for k, v in request.args.items()}

answered Jun 29, 2019 at 9:26

LiuXiMin

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