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Python Flask REST API API Protection Create User

please help Couldn't create a user with a valid password

i need help please

from flask import Blueprint, make_response
from argon2 import PasswordHasher
from flask.ext.restful import Resource, Api, reqparse, marshal_with, fields
import json
import models

user_fields = {
    'username': fields.String

ph = PasswordHasher()
##def sec_password(password):
#    secret=ph.harsh(password)
class UserList(Resource):
    def __init__(self):
        self.reqparse = reqparse.RequestParser()
            location=['form', 'json']

            location=['form', 'json']

            location=['form', 'json']

    def post(self):
        args = self.reqparse.parse_args()
        if args.get('password') == args.get('confirm_password'):
            user = models.User.create_user(**args)
            return marshal(user, user_fields), 201
            return ('Password and password verification do not match'), 400

users_api = Blueprint('resources.users', __name__)
api = Api(users_api)
api.add_resource(UserList, '/api/v1/users')