Support Template Rendering Configuration Stream Helpers Useful Internals Signals Class-Based Views URL Route Registrations View Function Options Command Line Interface Additional Notes Design notes, legal Flask application looks something like this: from flask import Flask app = Flask(__name__) @app.route('/') def hello_world(): return 'Hello, World!' So what did that code do? 1. First we imported files, and so on. For more information have a look at the Flask documentation. 3. We then use the route() decorator to tell Flask what URL should trigger our function. 4. The function is given a name

Flask application looks something like this: from flask import Flask app = Flask(__name__) @app.route('/') def hello_world(): return 'Hello, World!' So what did that code do? 1. First we imported the files, and so on. For more information have a look at the Flask documentation. 3. We then use the route() decorator to tell Flask what URL should trigger our function. 4. The function is given a name which remember and use to directly visit a page. Use the route() decorator to bind a function to a URL. @app.route('/') def index(): return 'Index Page' @app.route('/hello') (continues on next page) 10 Chapter

。当用户访问根地址的时候，我们需要返回一行欢迎文字。这个任 务只需要下面几行代码就可以完成： app.py：程序主页 from flask import Flask app = Flask(__name__) @app.route('/') def hello(): return 'Welcome to My Watchlist!' 按照惯例，我们把程序保存为 app.py，确保当前目录是项目的根目录，然后在命令 所谓的“注册”，就是给这个函数戴上一个装饰器帽子。我们使用 app.route() 装 饰器来为这个函数绑定对应的 URL，当用户在浏览器访问这个 URL 的时候，就会 触发这个函数，获取返回值，并把返回值显示到浏览器窗口： @app.route('/') def hello(): return 'Welcome to My Watchlist!' 填入 app.route() 装饰器的第一个参数是 URL 修改视图函数返回值 首先，你可以自由修改视图函数的返回值，比如： @app.route('/') def hello(): return u'欢迎来到我的 Watchlist！' 返回值作为响应的主体，默认会被浏览器作为 HTML 格式解析，所以我们可以添加 一个 HTML 元素标记： @app.route('/') def hello(): return '

Hello

Flask-RESTful will call the handle_error() function on any 400 or 500 error that happens on a Flask-RESTful route, and leave other routes alone. You may want your app to return an error message with the correct media endpoint (str) – endpoint name (defaults to Resource.__name__.lower() Can be used to reference this route in fields.Url fields • resource_class_args (tuple) – args to be forwarded to the constructor of the

Flask-RESTful will call the handle_error() function on any 400 or 500 error that happens on a Flask-RESTful route, and leave other routes alone. You may want your app to return an error message with the correct media endpoint (str) – endpoint name (defaults to Resource.__name__.lower() Can be used to reference this route in fields.Url fields resource_class_args (tuple) – args to be forwarded to the constructor of the

Flask-RESTful will call the handle_error() function on any 400 or 500 error that happens on a Flask-RESTful route, and leave other routes alone. You may want your app to return an error message with the correct media endpoint (str) – endpoint name (defaults to Resource.__name__.lower() Can be used to reference this route in fields.Url fields • resource_class_args (tuple) – args to be forwarded to the constructor of the

Flask-RESTful will call the handle_error() function on any 400 or 500 error that happens on a Flask-RESTful route, and leave other routes alone. You may want your app to return an error message with the correct media endpoint (str) – endpoint name (defaults to Resource.__name__.lower() Can be used to reference this route in fields.Url fields • resource_class_args (tuple) – args to be forwarded to the constructor of the

Flask-RESTful will call the handle_error() function on any 400 or 500 error that happens on a Flask-RESTful route, and leave other routes alone. You may want your app to return an error message with the correct media .html#str]) – endpoint name (defaults to Resource.__name__.lower() Can be used to reference this route in fields.Url fields resource_class_args (tuple [https://docs.python.org/3/library/stdtypes.html#tuple])

Flask-RESTful will call the handle_error() function on any 400 or 500 error that happens on a Flask-RESTful route, and leave other routes alone. You may want your app to return an error message with the correct media .html#str]) – endpoint name (defaults to Resource.__name__.lower() Can be used to reference this route in fields.Url fields resource_class_args (tuple [https://docs.python.org/3/library/stdtypes.html#tuple])

Flask-RESTful will call the handle_error() function on any 400 or 500 error that happens on a Flask-RESTful route, and leave other routes alone. You may want your app to return an error message with the correct media