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 我搜索了cherrypy源代码，这是我发现的。 在_cptree.py模块中，您将找到Application类。 下面是一个Tree类，它有mount方法，我们用它来绑定应用程序（例如cherrypy.tree.mount(Root(), "/", config=config) ） 
 
def mount(self, root, script_name="", config=None):
    ...
 
 当您查看此方法时，您将看到下面的代码; 
 
def mount(self, root, script_name="", config=None):
    ...
    if isinstance(root, Application):
        app = root
        if script_name != "" and script_name != app.script_name:
            raise ValueError(
                "Cannot specify a different script name and pass an "
                "Application instance to cherrypy.mount")
        script_name = app.script_name
    else:
        app = Application(root, script_name)

        # If mounted at "", add favicon.ico
        if (script_name == "" and root is not None
                and not hasattr(root, "favicon_ico")):
            favicon = os.path.join(os.getcwd(), os.path.dirname(__file__),
                                   "favicon.ico")
            root.favicon_ico = tools.staticfile.handler(favicon)

    if config:
        app.merge(config)

    self.apps[script_name] = app
 
 因此，代码表明您传递给mount方法的每个对象（应用程序）都是Application实例或包装在Application实例中。 那么为什么会这样呢？ 当您在Tree类上面检查Application类时，您将看到如下所示的__call__方法; 
 
def __call__(self, environ, start_response):
    return self.wsgiapp(environ, start_response)
 
 是的你现在看到它，它是wsgi接口。 因此， Application是一个wsgi包装器，适用于您的应用程序。 当你查看cherrypy的源代码时，你可能会学到很多东西。 我希望这个答案可以帮到你。 

I searched the cherrypy source code and here is what I found. In _cptree.py module you will find the Application class. Below that, there is a Tree class which has mount method which we are used to binding applications with (e.g. cherrypy.tree.mount(Root(), "/", config=config))
 
def mount(self, root, script_name="", config=None):
    ...
 
When you look inside this method you will see the code below;
 
def mount(self, root, script_name="", config=None):
    ...
    if isinstance(root, Application):
        app = root
        if script_name != "" and script_name != app.script_name:
            raise ValueError(
                "Cannot specify a different script name and pass an "
                "Application instance to cherrypy.mount")
        script_name = app.script_name
    else:
        app = Application(root, script_name)

        # If mounted at "", add favicon.ico
        if (script_name == "" and root is not None
                and not hasattr(root, "favicon_ico")):
            favicon = os.path.join(os.getcwd(), os.path.dirname(__file__),
                                   "favicon.ico")
            root.favicon_ico = tools.staticfile.handler(favicon)

    if config:
        app.merge(config)

    self.apps[script_name] = app
 
So, the code says that every object (application) you pass to the mount method is either Application instance or wrapped in an Application instance. So why is that so? When you check Application class above Tree class, you will see a __call__ method like below;
 
def __call__(self, environ, start_response):
    return self.wsgiapp(environ, start_response)
 
Yes you see it now, it is wsgi interface. Therefore, Application is a wsgi wrapper for your cherrypy applications. When you check the source code of cherrypy you may learn lots of things. I hope this answer help you.