2

如果我在 WSGI 服务器上运行以下代码，则会引发错误，否则不会。

class Handler(webapp2.RequestHandler):
    def __init__(self, template, *args, **kwargs):
        print "Kwargs in Handler:", kwargs
        self.template = template
        super(Handler, self).__init__(*args, **kwargs)

class MainHandler(Handler):
    def __init__(self, *args, **kwargs):
        template = jinja_env.get_template("helloworld.html")
        print "Kwargs in MainHandler:", kwargs
        super(MainHandler, self).__init__(template= template, *args, **kwargs)

如果我在服务器上运行它，通过

from wsgiref.simple_server import make_server
server = make_server('localhost', 8000, app);

while True:
    server.handle_request()

并试图访问localhost:8080，我得到

Kwargs in MainHandler: {}
ERROR:root:__init__() got multiple values for keyword argument 'template'
Traceback (most recent call last):
  File "/media/Data/code/kaiwarta/env/local/lib/python2.7/site-packages/webapp2.py", line 1535, in __call__
    rv = self.handle_exception(request, response, e)
  File "/media/Data/code/kaiwarta/env/local/lib/python2.7/site-packages/webapp2.py", line 1529, in __call__
    rv = self.router.dispatch(request, response)
  File "/media/Data/code/kaiwarta/env/local/lib/python2.7/site-packages/webapp2.py", line 1278, in default_dispatcher
    return route.handler_adapter(request, response)
  File "/media/Data/code/kaiwarta/env/local/lib/python2.7/site-packages/webapp2.py", line 1101, in __call__
    handler = self.handler(request, response)
  File "main.py", line 24, in __init__
    super(MainHandler, self).__init__(template= template, *args, **kwargs)
TypeError: __init__() got multiple values for keyword argument 'template'

（请注意，kwargs在传递给 Handler 之前它是空的。）

但是，如果我不启动服务器foo = MainHandler()而是这样做，它会按预期运行：

Kwargs in MainHandler: {}
Kwargs in Handler: {}

第一种情况出了什么问题？

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