%%writefile flask_beispiel_1.py
from flask import Flask
app = Flask(__name__)

@app.route("/")
def hello():
    return "Hello World!"

if __name__ == "__main__":
    app.run()

Writing flask_beispiel_1.py

!python flask_beispiel_1.py

 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
127.0.0.1 - - [03/Dec/2015 22:05:16] "GET / HTTP/1.1" 200 -
^C

from telnetlib import Telnet

connection = Telnet('127.0.0.1',5000)
connection.write(b'GET / HTTP/1.1\r\n')
connection.write(b'Host: 127.0.0.1\r\n')
connection.write(b'\r\n')
response = connection.read_all()
print response

HTTP/1.0 200 OK
Content-Type: text/html; charset=utf-8
Content-Length: 12
Server: Werkzeug/0.10.4 Python/2.7.10
Date: Thu, 03 Dec 2015 21:05:57 GMT

Hello World!

%%writefile flask_beispiel_2.py
from flask import Flask
app = Flask(__name__)

@app.route("/")
def index():
    return """<html>
   <head>
   <title>index</title>
   </head>
   <body>
   <h2>Dies ist die erste Seite</h2>
</body>
</html>
"""

if __name__ == "__main__":
    app.run()

Writing flask_beispiel_2.py

!python flask_beispiel_2.py

 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
127.0.0.1 - - [03/Dec/2015 22:05:16] "GET / HTTP/1.1" 200 -
^C

%%writefile flask_beispiel_3.py

# -*- coding: utf-8 -*-

from flask import Flask
app = Flask(__name__)
app.debug = False

@app.route("/")
def index():
    return """<html>
   <head>
   <title>Erste Seite</title>
   </head>
   <body>
   <h2>Dies ist die erste Seite</h2>
   <a href="zwei">Zur zweiten Seite</a>
   </body>
</html>
"""

@app.route("/zwei")
def zwei():
    return """<html>
   <head>
   <title>Zweite Seite</title>
   </head>
   <body>
   <h2>Dies ist die zweite Seite</h2>
   <a href="/">Zurück zur ersten Seite</a>
   </body>
</html>
"""

if __name__ == "__main__":
    app.run()

Overwriting flask_beispiel_3.py

!python flask_beispiel_3.py

 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
127.0.0.1 - - [03/Dec/2015 22:05:16] "GET / HTTP/1.1" 200 -
^C

from IPython.display import IFrame
IFrame('http://flask.pocoo.org/docs/0.10/quickstart/#debug-mode', width='100%', height=350)

from IPython.display import IFrame
IFrame('http://flask.pocoo.org/docs/0.10/tutorial', width='100%', height=350)

%%writefile flask_beispiel_4.py
from flask import request, Flask, render_template_string

login_template = """  <h2>Login</h2>
  {% if error %}<p class=error><strong>Error:</strong> {{ error }}{% endif %}
  <form action="{{ url_for('login') }}" method=post>
    <dl>
      <dt>Username:
      <dd><input type=text name=username>
      <dt>Password:
      <dd><input type=password name=password>
      <dd><input type=submit value=Login>
    </dl>
  </form>
"""

helloworld_template = """  <h2>Hello {{user}}</h2>
  {% if error %}<p class=error><strong>Error:</strong> {{ error }}{% endif %}
"""

def valid_login(user,passwd):
    if user.startswith('a'): return True
    else: return False

def log_the_user_in(user):
    return render_template_string(helloworld_template, user=user)


app = Flask(__name__)
app.debug = True

@app.route('/login', methods=['POST', 'GET'])
def login():
    error = None
    if request.method == 'POST':
        if valid_login(request.form['username'],
                       request.form['password']):
            return log_the_user_in(request.form['username'])
        else:
            error = 'Invalid username/password'
    # the code below is executed if the request method
    # was GET or the credentials were invalid
    return render_template_string(login_template, error=error)

if __name__ == "__main__":
    app.run()

Writing flask_beispiel_4.py

!python flask_beispiel_4.py

 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
 * Restarting with stat
127.0.0.1 - - [03/Dec/2015 22:38:06] "POST /login HTTP/1.1" 200 -
^C

%%writefile flask_beispiel_5.py
from flask import Flask, session, redirect, url_for, escape, request

app = Flask(__name__)
app.debug = True

@app.route('/')
def index():
    if 'username' in session:
        return 'Logged in as %s' % escape(session['username'])
    return 'You are not logged in'

@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        session['username'] = request.form['username']
        return redirect(url_for('index'))
    return '''
        <form action="" method="post">
            <p><input type=text name=username>
            <p><input type=submit value=Login>
        </form>
    '''

@app.route('/logout')
def logout():
    # remove the username from the session if it's there
    session.pop('username', None)
    return redirect(url_for('index'))

# set the secret key.  keep this really secret:
app.secret_key = 'A0Zr98j/3yX R~XHH!jmN]LWX/,?RT'

if __name__ == "__main__":
    app.run()

Overwriting flask_beispiel_5.py

!python flask_beispiel_5.py

 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
 * Restarting with stat
127.0.0.1 - - [03/Dec/2015 22:42:37] "GET / HTTP/1.1" 200 -
127.0.0.1 - - [03/Dec/2015 22:42:41] "GET /login HTTP/1.1" 200 -
127.0.0.1 - - [03/Dec/2015 22:42:55] "POST /login HTTP/1.1" 302 -
127.0.0.1 - - [03/Dec/2015 22:42:55] "GET / HTTP/1.1" 200 -
127.0.0.1 - - [03/Dec/2015 22:43:02] "GET /logout HTTP/1.1" 302 -
127.0.0.1 - - [03/Dec/2015 22:43:02] "GET / HTTP/1.1" 200 -
^C

@app.errorhandler(404)
def not_found(error):
    resp = make_response(render_template('error.html'), 404)
    resp.headers['X-Something'] = 'A value'
    return resp

from flask import Flask

app = Flask('Test')
ctx = app.app_context()
ctx.g.user = 'nik'

user = getattr(ctx.g, 'user', None)
user = ctx.g.get('user', None)
print(user)
print('user' in ctx.g)

nik
True

%%writefile PTFBestellformular.html
<html>
<head>
  <title>PTF Bestellformular</title>
</head>
<body>
  <h1>PTF Bestellformular</h1>
  <form ACTION="/formular" method="GET">
    <h3>Kunde</h3>
      <p>Name <input name="Kunde" size="46"/></p>
      <p>Strasse <input name="Strasse" size="40"/></p>
      <p>Ort <input name="Ort" size="20"> Plz <input name="Plz" size="4"></p>
    <h3>Kreditkarte</h3> 
      <p>Mastercard <input name="Kreditkarte" type="radio" value="Mastercard"/>
         Visacard <input name="Kreditkarte" type="radio" value="Visacard"/></p>
      <p>Nummer <input name="Kreditkartennummer" size="10"/>
         Ablaufdatum <input name="Ablaufdatum" size="4"/></p>
    <h3>PTF Bestellgr&ouml;&szlig;e</h3>
      <p>Gro&szlig; <input name="Groesse" type="radio" value="gross"/>
         Mittel <input name="Groesse" type="radio" value="mittel"/>
         Klein <input name="Groesse" type="radio" value="klein"/></p>
    <h3>Zustellung</h3>
      <p>Expresszustellung <input name="Express" type="checkbox"/></p>
    <p><input type="submit" value="Bestellung abschicken"/></p>
  </form>
  <p>Vielen Dank f&uuml;r ihre Bestellung!</p>
</body>
</html>

Writing PTFBestellformular.html

%%writefile flask_beispiel_6.py
from flask import Flask, request

app = Flask(__name__)
app.debug = False

def leseDatei(dateiname):
    try:
        datei = open(dateiname,"r")
        gesamterText = datei.read()
        datei.close()
        return gesamterText
    except IOError:
        return "Die Datei {} wurde nicht gefunden".format(dateiname)

@app.route('/')
def index():
    return leseDatei('PTFBestellformular.html')

@app.route('/formular', methods=['GET', 'POST'])
def formularausfuehren():
    if request.method == 'GET':
        html = """<!doctype html>
<html>
  <head>
  </head>
  <body>
    <ul>"""
        for i in request.args: 
            html = html + '      <li>'+i+': '+request.args[i]+'</li>'
        html = html + """
    </ul>
  </body>
</html>"""
        return html
    
app.run()

Writing flask_beispiel_6.py

!python flask_beispiel_6.py

 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
127.0.0.1 - - [03/Dec/2015 22:05:16] "GET / HTTP/1.1" 200 -
^C

%%writefile flask_beispiel_7.py
from flask import render_template

@app.route('/hello/')
@app.route('/hello/<name>')
def hello(name=None):
    return render_template('hello.html', name=name)

Writing flask_beispiel_7.py

!python flask_beispiel_7.py

 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
127.0.0.1 - - [03/Dec/2015 22:05:16] "GET / HTTP/1.1" 200 -
^C

%%writefile templates/hello.html
<!doctype html>
<title>Hello from Flask</title>
{% if name %}
  <h1>Hello {{ name }}!</h1>
{% else %}
  <h1>Hello World!</h1>
{% endif %}

Writing templates/hello.html

%%writefile flask_beispiel_8.py
from flask import Flask, request, render_template

app = Flask(__name__)
app.debug = False

@app.route('/')
def index():
    return render_template('PTFBestellformular.html')

@app.route('/formular', methods=['GET', 'POST'])
def formularausfuehren():
    if request.method == 'GET':
        return render_template('requestTemplate.html')
    
app.run()

Writing flask_beispiel_8.py

%%writefile templates/requestTemplate.html
<!doctype html>
<html>
  <head>
  </head>
  <body>
    <ul>
        {% for i in request.args %} 
        <li>{{ i }}:{{ request.args[i] }}</li>
        {% endfor %}
    </ul>
  </body>
</html>

Writing templates/requestTemplate.html

!python flask_beispiel_8.py

 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
127.0.0.1 - - [03/Dec/2015 22:05:16] "GET / HTTP/1.1" 200 -
^C

from jinja2 import Template

users = [
dict(username='Klever',url='nik.klever@hs-augsburg.de'),
dict(username='Kowarschick',url='wolfgang.kowarschick@hs-augsburg.de'),
dict(username='Kipp',url='michael.kipp@hs-augsburg.de'),
dict(username='Rist',url='thomas.rist@hs-augsburg.de'),
]
    
templateForm = """
<title>{% block title %}{% endblock %}</title>
<ul>
{% for user in users %}
  <li><a href="{{ user['url'] }}">{{ user['username'] }}</a></li>
{% endfor %}
</ul>
"""
    
template = Template(templateForm)
rs=template.render(users=users)
print(rs)

<title></title>
<ul>

  <li><a href="nik.klever@hs-augsburg.de">Klever</a></li>

  <li><a href="wolfgang.kowarschick@hs-augsburg.de">Kowarschick</a></li>

  <li><a href="michael.kipp@hs-augsburg.de">Kipp</a></li>

  <li><a href="thomas.rist@hs-augsburg.de">Rist</a></li>

</ul>

from flask import Markup
Markup('<strong>Hello %s!</strong>') % '<blink>hacker</blink>'

Markup(u'<strong>Hello &lt;blink&gt;hacker&lt;/blink&gt;!</strong>')

%%writefile flask_beispiel_9.py
# -*- coding: utf-8 -*-
from flask import Flask, request, render_template

app = Flask(__name__)
app.debug = True

@app.route('/')
def index():
    return render_template('CSVUpload.html')

@app.route('/upload', methods=['GET', 'POST'])
def upload_file():
    if request.method == 'POST':
        f = request.files['upload']
        dateiSpeicher = f.stream.read().decode('utf-8')
        dateiZeilen = dateiSpeicher.split('\n')[:-1]
        return render_template('uploadfile.html', dateiZeilen = dateiZeilen, dateiName = f.filename)
    
app.run()

Overwriting flask_beispiel_9.py

%%writefile templates/CSVUpload.html
<html>
  <head>
    <title>CSV Upload</title>
  </head>
  <body>
    <h1>CSV Upload</h1>
    <form ACTION="/upload" method="POST" enctype ="multipart/form-data">
      <p><input type="file" name="upload"/></p>
      <p><input type="submit" value="Datei hochladen"/></p>
    </form>
    <p>Vielen Dank!</p>
  </body>
</html>

Writing templates/CSVUpload.html

%%writefile templates/uploadfile.html
<html>
<head>
  <title>CSV Datei</title>
  <style type="text/css">
.even { background-color:#ffffff; }
.odd { background-color:#e0e0e0; }
  </style>
</head>
<body>
  <h1>CSV Datei "{{ dateiName }}"</h1>
    <ul>
{% for dateiZeile in dateiZeilen %}
      <li class =  "{{loop.cycle('odd','even')}}"> {{ loop.index}}. Zeile = "{{ dateiZeile }}" </li>
{% endfor %}
    </ul>
</body>
</html>

Writing templates/uploadfile.html

Variable	Wert
path	`/page.html`
script_root	`/myapplication`
base_url	`http://www.example.com/myapplication/page.html`
url	`http://www.example.com/myapplication/page.html?x=y`
url_root	`http://www.example.com/myapplication/`

Flask_Grundlagen¶

Flask - Grundlagen und Einführung¶

Flask Übersicht¶

Installation¶

Flask "Hello World"¶

Erklärung¶

Decorator¶

HTTP Telnet Client zum Flask Server¶

Chance im Team¶

Chance im Team¶

Dokumentation¶

Quickstart¶

Tutorial¶

Flask - Objekte¶

Flask Request Objekt¶

Flask Session Objekt¶

Flask Response Objekt¶

Flask 'g' - Globale Objekte in Anwendungen¶

Aktives Plenum¶

PTFBestellformular.html¶

PTFBestellformular.py¶

Flask Templates - Jinja¶

MVC Architektur¶

HTML Templates¶

Obige Aufgabe jetzt mit Templates¶

Weiteres einfaches Beispiel¶

Jinja High-Level API¶

Template Design¶

Variable¶

Filter¶

Tests¶

Kommentare¶

Template Vererbung¶

Kontrollstrukturen¶

For¶

If¶

Assignment¶

Include¶

Jinja in Flask¶

Markup in Flask¶

Aktives Plenum¶

CSVUpload.py¶

CSVUpload.html¶

uploadfile.html¶

Quickstart ¶

Tutorial ¶