Application Setup

Application Factory

首先创建一个文件夹 flaskr,然后在文件夹中创建一个文件 __init__.py

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import os

from flask import Flask


def create_app(test_config=None):
    # create and configure the app
    app = Flask(__name__, instance_relative_config=True)
    app.config.from_mapping(
        SECRET_KEY='dev',
        DATABASE=os.path.join(app.instance_path, 'flaskr.sqlite'),
    )

    if test_config is None:
        # load the instance config, if it exists, when not testing
        app.config.from_pyfile('config.py', silent=True)
    else:
        # load the test config if passed in
        app.config.from_mapping(test_config)

    # ensure the instance folder exists
    try:
        os.makedirs(app.instance_path)
    except OSError:
        pass

    # a simple page that says hello
    @app.route('/hello')
    def hello():
        return 'Hello, World!'

    return app

create_app 就是项目函数,他主要完成的功能见http://flask.pocoo.org/docs/1.0/tutorial/factory/.

Run the application

需要先设置项目函数的包与开发的模式:

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export FLASK_APP=flaskr

export FLASK_ENV=development

然后运行这个项目:

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flask run

之后在浏览器中访问 http://127.0.0.1/hello 即可实现访问。