Flask-WTF Install - Shell/Bash

Flask-WTF is an extension for Flask that integrates WTForms library, a flexible forms validation and rendering library for Python web development, to make it easy to create and validate forms with Flask.

Here's how to install Flask-WTF using Shell/Bash commands:

$ pip install flask-wtf

This will install Flask-WTF and its dependencies.

Make sure you have Flask installed on your system before installing Flask-WTF. If you don't have Flask installed, you can install it using the following command:

$ pip install flask

Once Flask-WTF is installed, you can import it into your Flask application and start using it to create and validate forms.

from flask_wtf import FlaskForm
from wtforms import StringField, SubmitField
from wtforms.validators import DataRequired

class MyForm(FlaskForm):
    name = StringField('Name', validators=[DataRequired()])
    submit = SubmitField('Submit')

In this example, we create a new form called MyForm that has a single field called name and a submit button. The DataRequired validator ensures that the name field is not empty when the form is submitted.

To render this form in a Flask view, we can do something like this:

from flask import render_template

@app.route('/form', methods=['GET', 'POST'])
def form():
    form = MyForm()
    if form.validate_on_submit():
        # Do something with form data
        return 'Submitted'
    return render_template('form.html', form=form)

In this example, we create a new view called /form that renders a template called form.html and passes the MyForm instance to the template. We also check if the form is submitted and valid using form.validate_on_submit(), and if so, we can do something with the form data and return a success message.

That's it! Flask-WTF makes it easy to create and validate forms in Flask.