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Python Flask REST API API Protection Create User

create user

im stuck please assist

resources/users.py
from flask import Blueprint

from flask.ext.restful import Resource, Api, reqparse, marshal_with, fields

import models

user_fields = {
    'username': fields.String
}


class UserList(Resource):
    def __init__(self):
        self.reqparse = reqparse.RequestParser()
        self.reqparse.add_argument(
            'username',
            required=True,
            location=['form', 'json']
        )
        super().__init__()

    @marshal_with(user_fields)
    def post(self):
        args = self.reqparse.parse_args()
        if args.get('password') == args.get('confirm_password'):
            try:
                user = models.User.create_user(**args)
            except Exception as error:
                return {'error': str(error)}, 400
            else:
                return marshal(user, user_fields), 201
        return {
            'error': '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')