pip install flask

from flask import Flask app = Flask(__name__) @app.route('/') def hello_world(): return 'hello world' if __name__ == '__main__': app.run(host='127.0.0.1',port=5000)

from flask import Flask app = Flask(__name__) app.debug=True @app.route('/') def hello_world(): return 'Hello World!' @app.route('/login') def login(): return 'Login' if __name__ == '__main__': app.run()

@app.route('/') def index(): return 'Index Page' @app.route('/hello') def hello(): return 'Hello, World'

@app.route('/user/') def show_user_profile(username): # show the user profile for that user return 'User %s' % username @app.route('/post/') def show_post(post_id): # show the post with the given id, the id is an integer return 'Post %d' % post_id

>>> from flask import Flask, url_for >>> app = Flask(__name__) >>> @app.route('/') ... def index(): pass ... >>> @app.route('/login') ... def login(): pass ... >>> @app.route('/user/') ... def profile(username): pass ... >>> with app.test_request_context(): ...  print url_for('index') ...  print url_for('login') ...  print url_for('login', next='/') ...  print url_for('profile', username='John Doe') ... / /login /login?next=/ /user/John%20Doe 

from flask import request @app.route('/login', methods=['GET', 'POST']) def login(): if request.method == 'POST': do_the_login() else: show_the_login_form()

url_for('static', filename='style.css')

from flask import render_template @app.route('/hello/') @app.route('/hello/') def hello(name=None): return render_template('hello.html', name=name)

 {% if name %} 
Hello {{ name }}!
 {% else %} 
Hello, World!
 {% endif %}

from flask import request @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('login.html', error=error)

searchword = request.args.get('key', '')

from flask import request from werkzeug.utils import secure_filename @app.route('/upload', methods=['GET', 'POST']) def upload_file(): if request.method == 'POST': f = request.files['the_file'] f.save('/var/www/uploads/' + secure_filename(f.filename))

from flask import request @app.route('/') def index(): username = request.cookies.get('username') # 使用 cookies.get(key) 代替 cookies[key] 避免 # 得到 KeyError 如果cookie不存在

from flask import make_response @app.route('/') def index(): resp = make_response(render_template(...)) resp.set_cookie('username', 'the username') return resp

from flask import abort, redirect, url_for @app.route('/') def index(): return redirect(url_for('login')) @app.route('/login') def login(): abort(401) this_is_never_executed()

from flask import render_template @app.errorhandler(404) def page_not_found(error): return render_template('page_not_found.html'), 404

@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, session, redirect, url_for, escape, request app = Flask(__name__) @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 ''' 
 
 ''' @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'

{% extends 'layout.html' %} {% block title %}主页{% endblock %} {% block body %} 
 
主页
 {% endblock %}

Flask小例子

   
 {% block body %}{% endblock %} 
 
这是页脚

{% extends 'layout.html' %} {% block title %}主页{% endblock %} {% block body %} 
 
主页
本项目演示了Flask的简单使用方法，点击导航栏上的菜单条查看具体功能。
 {% endblock %}

 {% if not session.logged_in %} log in {% else %} log out {% endif %} 

 {% for key,value in data.items() %}  {{ key }}{{ value }} {% endfor %}  文件