Tornado关闭static_url（）的include_version

Question

我想在调用static_url（）时关闭？v = version信息。

我有以下staticFileHandler类，我试图重写make_static_url（）类方法：

class BaseHandlerStatic(tornado.web.StaticFileHandler): 
    @classmethod 
    def make_static_url(cls, settings, path, include_version=False): 
     super().make_static_url(settings, path, include_version) 

不幸的是这样做会导致我的程序在500错误与崩溃：

"/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/tornado-4.5.dev1-py3.5-macosx-10.6-intel.egg/tornado/web.py", line 1342, in static_url 
     return base + get_url(self.settings, path, **kwargs) 
    TypeError: Can't convert 'NoneType' object to str implicitly 
[E 170213 16:23:32 web:1977] 500 GET/(127.0.0.1) 14.66ms 

可有人请告诉我我做错了什么，以及如何将include_version设置为False？

感谢

Answer 1

你需要一个return声明：

class BaseHandlerStatic(tornado.web.StaticFileHandler): 
    @classmethod 
    def make_static_url(cls, settings, path, include_version=False): 
     return super().make_static_url(settings, path, include_version) 

否则你make_static_url隐含返回None，而base + get_url(...)表达抛出一个异常，试图链状base与None。