Total Views: link: https://flask.palletsprojects.com/en/stable/
快速开始
1
2
3
4
5
6
7
| from flask import Flask
app = Flask(__name__)
@app.route("/")
def hello_world():
return "<p>Hello, World!</p>"
|
其他有用函数
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
| from flask import request, url_for, render_template, abort, redirect, make_response, session
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'))
@app.route('/hello/')
@app.route('/hello/<name>')
def hello(name=None):
return render_template('hello.html', person=name)
@app.route('/')
def index():
return redirect(url_for('login'))
@app.route('/login')
def login():
abort(401)
this_is_never_executed()
@app.errorhandler(404)
def not_found(error):
resp = make_response(render_template('error.html'), 404)
resp.headers['X-Something'] = 'A value'
return resp
@app.route('/')
def index():
if 'username' in session:
return f'Logged in as {session["username"]}'
return 'You are not logged in'
|
app.config
https://flask.palletsprojects.com/en/stable/config/#configuration-basics
实际上是字典的子类， 可以像任何字典一样进行修改
An interesting pattern is also to use classes and inheritance for configuration:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
| class Config(object):
TESTING = False
class ProductionConfig(Config):
DATABASE_URI = 'mysql://user@localhost/foo'
class DevelopmentConfig(Config):
DATABASE_URI = "sqlite:////tmp/foo.db"
class TestingConfig(Config):
DATABASE_URI = 'sqlite:///:memory:'
TESTING = True
app.config.from_object('configmodule.ProductionConfig')
|
view类
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
| from flask.views import View
class ListView(View):
def __init__(self, model, template):
self.model = model
self.template = template
def dispatch_request(self):
items = self.model.query.all()
return render_template(self.template, items=items)
app.add_url_rule(
"/users/",
view_func=ListView.as_view("user_list", User, "users.html"),
)
app.add_url_rule(
"/stories/",
view_func=ListView.as_view("story_list", Story, "stories.html"),
)
|
中间件
https://flask.palletsprojects.com/en/stable/lifecycle/
1
2
3
| @app.before_request
@app.after_request
@app.teardown_request
|
常用扩展
1
2
3
4
5
6
7
8
9
| pip install Flask-SQLAlchemy
pip install Flask-Migrate
pip install flask-restful
pip install WTForms
pip install Flask-WTF
pip install Flask-Admin
pip install Flask-Login
|