Solve the problem of missing data in request.form to obtain list in flask

When an api interface service is enabled on the flask server, the client often uses request.post to pass data to call the api, as shown below:

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import requests

post_data = {
    "text": ["abcdefg", "defaa", "ghisx"]
}
res = requests.post(url="http://127.0.0.1:5000/analyse", data=post_data)
print(res.text)

The client encapsulates the data whose key is "text" and value is ["abcdefg", "defaa", "ghisx"] and posts it to the server.

The server uses request.form to obtain the post data passed by the client, and then calls get("text") to obtain the value of the key text in the post data, as shown below:

#!/usr/bin/env python
# -*- coding:utf-8 -*-
from flask import Flask
from flask import request

app = Flask(__name__)


@app.route('/analyse', methods=['post'])
def analyse():
    data = request.form
    text_list = data.get("text")
    print(text_list, len(text_list))
    return ""


if __name__ == "__main__":
    app.run()

However, the output result is only the first item in the passed data, and what is obtained is not the length of the list, but the length of the first string:

abcdefg 7

In fact, when we print out the data, we can find that the data directly sent by the client is in ImmutableMultiDict format.

ImmutableMultiDict([('text', 'abcdefg'), ('text', 'defaa'), ('text', 'ghisx')])

At this point, you need to use the getlist method to read, as shown below:

text_list = data.getlist("text")

The output is:

['abcdefg', 'defaa', 'ghisx'] 3

It can be seen that in this way, the server correctly obtains the data of the client post.

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