慕课网Flask高级编程实战-1.项目准备 和 Flask入门

# 按照pipenv
pip install pipenv

# 进入虚拟环境（需要在项目目录上执行，如果当前目录没有，则会新建）
pipenv shell

# 退出虚拟环境
exit

# 使用pipenv按照类库
pipenv install #{package}

# 卸载类库
pipenv uninstall #{package}

# 查看按照包的依赖关系
pipenv graph

# 查看虚拟环境执行文件路径
pipenv --venv

# 实例化，构造函数的参数会作为Flask app核心对象的标识
app = Flask(__name__)
# 启动web app
# debug=True开启调试模式 1.修改文件后不用每次都重启服务器 2.可以在网页中显示异常
# host可以指定可以访问本网站的ip地址
# port启动端口
app.run(host="0.0.0.0", port=81, debug=True)

# 通过@app.route装饰器来注册路由，其中的参数为url路径。对应会调用hello()函数
@app.route("/hello")
def hello():
    """定义视图函数-mvc 中的controller"""
    return "我就不说hello world"

@app.route("/hello/")
def hello():
    return "我就不说hello world"

app.add_url_rule("/hello",view_func=hello)

    def route(self, rule, **options):
        """A decorator that is used to register a view function for a
        given URL rule.  This does the same thing as :meth:`add_url_rule`
        but is intended for decorator usage::

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

        For more information refer to :ref:`url-route-registrations`.

        :param rule: the URL rule as string
        :param endpoint: the endpoint for the registered URL rule.  Flask
                         itself assumes the name of the view function as
                         endpoint
        :param options: the options to be forwarded to the underlying
                        :class:`~werkzeug.routing.Rule` object.  A change
                        to Werkzeug is handling of method options.  methods
                        is a list of methods this rule should be limited
                        to (``GET``, ``POST`` etc.).  By default a rule
                        just listens for ``GET`` (and implicitly ``HEAD``).
                        Starting with Flask 0.6, ``OPTIONS`` is implicitly
                        added and handled by the standard request handling.
        """
        def decorator(f):
            endpoint = options.pop('endpoint', None)
            # 可以看到这里就是调用了add_url_rule，self就是我们实例化的app对象
            self.add_url_rule(rule, endpoint, f, **options)
            return f
        return decorator

# 载入配置文件
app.config.from_object("config")
# 读取配置文件
print(app.config["DEBUG"])

if __name__ == "__name__":
    app.run(host=app.config["HOST"], debug=app.config["DEBUG"], port=app.config["PORT"])