hello.py

import os
from flask import Flask, url_for, render_template, request, url_for
from flask import redirect, session, abort, escape
from flask import send_from_directory
from flask.ext.script import Manager, Command, Shell
from werkzeug import secure_filename

UPLOAD_FOLDER = '/home/fanzhong/path/to/the/uploads'
ALOWED_EXTENSIONS = set(['txt'])

app = Flask(__name__)
####upload demo
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
app.config['MAX_CONTENT_LENGTH'] = 16 * 1024 * 1024 
####upload demo
app.config['SECRET_KEY'] = 'development key'

@app.route('/')
def hello_world():
    return 'Hello World'

## int float and path
@app.route('/abcd1234/<test>')
def test_via(test):
    return 'test %s' % test

@app.route('/test/<int:testint>')
def test_via_int(testint):
    return 'testint %d' % testint

@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'GET':
        pass
    elif request.method == 'POST':
        pass

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

with app.test_request_context():
    print url_for('hello_world')
    #print url_for('test_via')
    print url_for('test_via', test='test/')
    print url_for('test_via_int', testint = 123)
    print url_for('hello')

#test
with app.test_request_context('/hello', method='POST'):
    assert request.path == '/hello'
    assert request.method == 'POST'

## request cookies redirect escape
@app.route('/show_entries')
def show_entries():
    if not session.get('login_'):
        abort(401)
    if 'username_' in session:
        username=escape(session['username_']) # use escape
    return render_template('show_entries.html', username=username)

@app.route('/login2', methods=['POST', 'GET'])
def login2():
    error = None
    username = 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'
    # return render_template('login.html',error = error)
    if request.method =='POST':
        if request.form['username'] != 'JOE':
            error = 'error username'
        elif request.form['password'] != 'abcd1234':
            error = 'error password'
        else:
            # print 'login!!'
            session['login_'] = True
            session['username_'] = request.form['username']
            return redirect(url_for('show_entries'))
    return render_template('login.html',error = error)

## upload demo
def allowed_file(filename):
    return '.' in filename and \
        filename.rsplit('.', 1)[1] in ALOWED_EXTENSIONS

@app.route('/upload', methods=['GET', 'POST'])
def upload_file():
    uploaded_filename = None
    if request.method == 'POST':
        file = request.files['file']
        if file and allowed_file(file.filename):
            filename = secure_filename(file.filename)
            file.save(os.path.join(app.config['UPLOAD_FOLDER'],
                filename))
            return redirect(url_for('upload_file',filename=filename))
    return render_template('upload.html')

@app.route('/uploads/<filename>')
def uploaded_file(filename):
    return send_from_directory(app.config['UPLOAD_FOLDER'],
                               filename)
## updload demo

## add bootstrap template demo
@app.route('/bootstrap')
def show_bootstrap():
    return render_template('bootstrap.html')

if __name__ == '__main__':
    app.run(debug=True)