Python + Flask III

FORMS


Imports

• from flask import Flask, render_template, url_for, request, redirect

Method

@app.route('/survey', methods=['GET', 'POST'] )

def survey():

if request.method == "POST":

signum = request.form['signum']

                return redirect( url_for('method_url') )

return render_template('survey.html', title_obj=Title())

Redirect

                return redirect( url_for('method_url') )

LOGGER

Import

from logging import DEBUG

Use

app.logger.debug('message')

DATETIME

Import

from datetime import datetime

Use

datetime.utcnow()

Session and Flashes

Session

Need Flask.secret_key for cookies

Generate Flask.secret_key 

In console:

• python
• imoprt os
• os.urandom(24)
• copy the key

In controller

app.config['SECRET_KEY'] = "_________KEY_________"

Flashing messages

Import

from flask import Flask, flash

Use in controller

flash( "message '{}' ".format(url) )

View

  <article class="flashes">

        {% with messages =  get_flashed_messages() %}

        {% if messages %}

        <ul>

            {% for message in messages %}

            <li>{{message}}</li>

            {% endfor %}

        </ul>

        {% endif %}

        {% endwith %}

    </article>