ТипError: __call __() принимает ровно 1 аргумент (2 данный)

Question

Я работаю над этим уроком. flask tutorial

Однако, я получил вышеуказанную ошибку, когда я работаю с веб-формами.

Это сообщение ошибки, возникшее из-под Flask.

File "C:\Python27\lib\site-packages\flask-0.10-py2.7.egg\flask\app.py", line 1836, in __call__ 
return self.wsgi_app(environ, start_response) 
File "C:\Python27\lib\site-packages\flask-0.10-py2.7.egg\flask\app.py", line 1820, in wsgi_app 
response = self.make_response(self.handle_exception(e)) 
File "C:\Python27\lib\site-packages\flask-0.10-py2.7.egg\flask\app.py", line 1403, in handle_exception 
reraise(exc_type, exc_value, tb) 
File "C:\Python27\lib\site-packages\flask-0.10-py2.7.egg\flask\app.py", line 1817, in wsgi_app 
response = self.full_dispatch_request() 
File "C:\Python27\lib\site-packages\flask-0.10-py2.7.egg\flask\app.py", line 1477, in full_dispatch_request 
rv = self.handle_user_exception(e) 
File "C:\Python27\lib\site-packages\flask-0.10-py2.7.egg\flask\app.py", line 1381, in handle_user_exception 
reraise(exc_type, exc_value, tb) 
File "C:\Python27\lib\site-packages\flask-0.10-py2.7.egg\flask\app.py", line 1475, in full_dispatch_request 
rv = self.dispatch_request() 
File "C:\Python27\lib\site-packages\flask-0.10-py2.7.egg\flask\app.py", line 1461, in dispatch_request 
return self.view_functions[rule.endpoint](**req.view_args) 
File "C:\workspace\Learn-flask\app\views.py", line 17, in login 
return render_template('login.html', title='Sign In',form=form) 
File "C:\Python27\lib\site-packages\flask-0.10-py2.7.egg\flask\templating.py", line 128, in render_template 
context, ctx.app) 
File "C:\Python27\lib\site-packages\flask-0.10-py2.7.egg\flask\templating.py", line 110, in _render 
rv = template.render(context) 
File "C:\Python27\lib\site-packages\jinja2-2.7.1-py2.7.egg\jinja2\environment.py", line 969, in render 
return self.environment.handle_exception(exc_info, True) 
File "C:\Python27\lib\site-packages\jinja2-2.7.1-py2.7.egg\jinja2\environment.py", line 742, in handle_exception 
reraise(exc_type, exc_value, tb) 
File "C:\workspace\Learn-flask\app\templates\login.html", line 1, in top-level template code 
{% extends "base.html"%} 
File "C:\workspace\Learn-flask\app\templates\base.html", line 17, in top-level template code 
{% block content %}{% endblock %} 
File "C:\workspace\Learn-flask\app\templates\login.html", line 9, in block "content" 
<p>Open id :{{form.openid(80)}}<br/> 

Вот код формы класса

from flask_wtf import Form 
from wtforms import StringField, BooleanField 
from wtforms.validators import DataRequired 

class LoginForm(Form): 
    openid = StringField('openid', validators=[DataRequired()]) 
    remember_me = BooleanField('remember_me', default=False) 

Где я сделал ошибку?

Answer 1

wtforms.fields.Field.__call__ только принимает аргументы ключевого слова, как указано в linked documentation. Если вы хотите передать 80 в maxlen затем использовать ключевое слово аргумент:

{{ form.openid(maxlength=80) }}