The problem that the flask_restful reqparse.RequestParser () help parameter cannot take effect

when passing the help parameter to add_argument when using flask_restful parameter parsing, the help message will not appear if an error is reported. The code is as follows:

-sharp -*-coding:utf-8 -*-

from flask_restful import reqparse
from flask import Flask, jsonify

app = Flask(__name__)

@app.route("/")
def index():
    parser = reqparse.RequestParser()
    parser.add_argument("page", type=int, help="invalid argument")
    args = parser.parse_args()
    return jsonify(args), 200

if __name__ == "__main__":
    app.run(port=9000, debug=True)

when accessed via http://localhost:9000/?page=9.1, you expect to return a 400error of "invalid argument", but the actual result is to return the default" 400 Bad Request The browser (or proxy) sent a request that this server could not understand. " Error prompt.
ask: what is the problem? If the classes parsed by flask_restful parameters cannot be used alone, is there a better method or tool for parameter verification and transformation? Thank you!

Flask-restful flask

Mar.28,2021

Hello, what you need to understand is when parameter parsing takes effect.
Please adjust according to the following code:

-sharp -*-coding:utf-8 -*-

from flask_restful import reqparse
from flask import Flask, jsonify

def parsers():
    parser = reqparse.RequestParser()
    parser.add_argument('page', type=int, help='invalid argument')
    return parser.parse_args()

app = Flask(__name__)

    
@app.route('/')
def index():
    args = parsers()
    return jsonify(args), 200

if __name__ == '__main__':
    app.run(port=9000, debug=True)

The parsing of the

parameter has already completed the mapping in the precompilation phase.
at the same time, the hybrid use of flask and flask-RESTful is not good.

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