访问 Python 字典中的键时出错

Question

I'm doing a request with the following data body and when I try to access users["primary"] it errors out. printing the value for the users key gives me ['secondaryIds', 'primary'] which is weird. Why is this an array rather than a dictionary.

data = {
    "users": {
        "primary": "a",
        "secondaryIds": ["b", "c", "a"]
    }
}

r = requests.post(url, data=data)

In my server code, before I get into the function where I'm trying to unpack the data, I do

body = event["body"]
parameters = urllib.parse.parse_qs(body)
users = parameters["users"]

update_users(users) // right now this function just prints `users` and returns a 200

Confused as to what's going on here and would love a little help. Thanks!

Answer 1

Unless you're setting

users = data['users']

that is a correctly raised NameError .

I think you want data['users']['primary']

---

Based on the updates to your question, this is likely happening because you're trying to parse a dictionary as a querystring. If you omit the line

parameters = urllib.parse.parse_qs(body)

you should be able to access the users list with

body['users']

or with

json.loads(body)['user']

I'm unclear on how your event returns the request body (if it parses it as json before returning or not)