Jinja2.exceptions.undefined Error
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta form is undefined flask Discuss the workings and policies of this site About Us Learn jinja2 filters more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us jinja2 github Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, jinja2 exceptions undefinederror page is undefined helping each other. Join them; it only takes a minute: Sign up Using getattr in Jinja2 gives me an error (jinja2.exceptions.UndefinedError: 'getattr' is undefined) up vote 0 down vote favorite 1 With regular python, I could get getattr(object, att) but in Jinja2, I get: jinja2.exceptions.UndefinedError jinja2.exceptions.UndefinedError: 'getattr' is undefined How can I use it? python attributes jinja2
'url_for' Is Undefined
share|improve this question edited Feb 15 at 13:19 dirn 7,26131731 asked Feb 15 at 10:33 somenxavier 649 We are going to need to see more details...... –gtlambert Feb 15 at 10:35 @gtlambert: this is about the Jinja2 template language, which comes installed by default when you use Flask. –Martijn Pieters♦ Feb 15 at 10:38 add a comment| 1 Answer 1 active oldest votes up vote 0 down vote accepted Jinja2 is not Python. It uses a Python-like syntax, but does not define the same built-in functions. Use subscription syntax instead; you can use attribute and subscription access interchangeably in Jinja2: {{ object[att] }} or you can use the attr() filter: {{ object|attr(att) }} From the Variables section of the template designer documentation: You can use a dot (.) to access attributes of a variable in addition to the standard Python __getitem__ “subscript” syntax ([]). The following lines do the same thing: {{ foo.bar }} {{ foo['bar'] }} and further down in the same section, exp
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you might have Meta Discuss the workings and policies of this flask render_template site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers jinja comment or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a http://stackoverflow.com/questions/35407008/using-getattr-in-jinja2-gives-me-an-error-jinja2-exceptions-undefinederror-ge community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up WTForms in Flask: UndefinedError: 'form' is undefined up vote -1 down vote favorite I'm new to Flask and WTForms, and I cannot render my HTML page. I've been through the WTforms documentation again and http://stackoverflow.com/questions/34083843/wtforms-in-flask-undefinederror-form-is-undefined again, but I can't find the source of the error: jinja2.exceptions.UndefinedError, UndefinedError: 'form' is undefined My code is below: forms.py from flask.ext.wtf import Form from wtforms import TextField, BooleanField, TextAreaField, StringField, PasswordField, SelectField, validators class LoginForm(Form): username = TextField('Username', [ validators.Required(), validators.Length(min=4, max=25) ]) password = PasswordField('New Password', [ validators.Required() ]) app.py from forms import * from wtforms import Form, fields, BooleanField, TextField, StringField, PasswordField, validators from werkzeug.security import generate_password_hash, \ check_password_hash @app.route('/login/', methods=['GET', 'POST']) def login(): form = LoginForm(request.form) if request.method == 'POST' and form.validate(): if load_user(form.username.data) is None: flash('Invalid username') else: if check_password_hash(cred.password, form.password.data): return redirect(url_for('browse')) else: flash('Invalid password') return render_template('login.html', title='Login', form=form) login.html {% extends "base.html" %} {% block body %}