Flask源码阅读（二）——启动服务器（run方法）

1.Flask提供的Web服务器不适合在生产环境中使用

2.run方法启动flask集成的服务器：

例：

if __name__ == '__main__':    app.run(debug=True)

3.源码：

def run(self, host='localhost', port=5000, **options):        """Runs the application on a local development server.  If the        :attr:`debug` flag is set the server will automatically reload        for code changes and show a debugger in case an exception happened.        :param host: the hostname to listen on.  set this to ``'0.0.0.0'``                     to have the server available externally as well.        :param port: the port of the webserver        :param options: the options to be forwarded to the underlying                        Werkzeug server.  See :func:`werkzeug.run_simple`                        for more information.        """        from werkzeug import run_simple        if 'debug' in options:            self.debug = options.pop('debug')        options.setdefault('use_reloader', self.debug)        options.setdefault('use_debugger', self.debug)        return run_simple(host, port, self, **options)

从源码中可以看出，Flask集成的run方法是由werkzeug中的run_simple方法提供的。run()接受debug参数时，options.pop('debug')，设定’use_reloader’默认参数为self.debug，’use_debugger’为self.debug.

4.总结

依赖werkzeug