warnings.simplefilter('error', Image.DecompressionBombWarning) 的范围

Question

我有以下骨架龙卷风程序：

class IS(BaseHandler):
   @tornado.gen.coroutine
   def get(self):
      #render stuff

   def post(self):
      try:
      # load Image 
      except RuntimeWarning:
      # handle exception

class Application(tornado.web.Application):
   def __init__(self):
      # Current handlers
      handlers = [
         (r'/',IS),
      ]

      # Settings dict for Application
      settings = {
         "template_path": "templates",
         "static_path": "static"
      }
      tornado.web.Application.__init__(self,handlers,debug=True,**settings)

if __name__ =='__main__':
   # is this the right place to set the warnings?
   warnings.simplefilter('error', Image.DecompressionBombWarning)
   app=Application()
   server=tornado.httpserver.HTTPServer(app)
   server.listen(7000)
   tornado.ioloop.IOLoop.current().start()

我想知道警告的设置范围是什么？我必须在 IS class 中设置它吗？还是我设置好的地方？还是应该在 Application init 中？

Answer 1

warnings.simplefilter 影响整个过程（当它不是从 with warnings.catch_warnings() 块内部调用时），因此要全局控制警告，您只需在启动时调用它一次，就像您已经完成。

warnings.simplefilter('error', Image.DecompressionBombWarning) 的范围

Scope of warnings.simplefilter('error', Image.DecompressionBombWarning)

python

tornado

pillow