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下面的代码块抛出一个错误，我不知道为什么——我根本没有改变它——这个错误突然开始发生：

def product_feed(request):
    """ Return all site activity from friends, etc. """
    if request.user.is_authenticated():
        return HttpResponseRedirect("/about/what_next/")
    else:
        return render_to_response("homepage.html", {}, context_instance=RequestContext(request))

这是它返回的最后一行 render_to_response 是问题发生的地方。

错误是：

Exception Type: SyntaxError at /
Exception Value: invalid syntax (views.py, line 804)

屏幕截图也显示了该问题。在此处输入图像描述

追溯：

Traceback:
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  111.                         response = callback(request, *callback_args, **callback_kwargs)
File "/Users/NB/Desktop/store/views.py" in product_feed
  261.      return render_to_response("homepage.html", {}, context_instance=RequestContext(request))
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/shortcuts/__init__.py" in render_to_response
  20.     return HttpResponse(loader.render_to_string(*args, **kwargs), **httpresponse_kwargs)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/template/loader.py" in render_to_string
  176.         return t.render(context_instance)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/template/base.py" in render
  140.             return self._render(context)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/test/utils.py" in instrumented_test_render
  62.     return self.nodelist.render(context)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/template/base.py" in render
  823.                 bit = self.render_node(node, context)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/template/debug.py" in render_node
  74.             return node.render(context)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/template/loader_tags.py" in render
  123.         return compiled_parent._render(context)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/test/utils.py" in instrumented_test_render
  62.     return self.nodelist.render(context)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/template/base.py" in render
  823.                 bit = self.render_node(node, context)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/template/debug.py" in render_node
  74.             return node.render(context)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/template/loader_tags.py" in render
  123.         return compiled_parent._render(context)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/test/utils.py" in instrumented_test_render
  62.     return self.nodelist.render(context)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/template/base.py" in render
  823.                 bit = self.render_node(node, context)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/template/debug.py" in render_node
  74.             return node.render(context)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/template/defaulttags.py" in render
  281.                 return nodelist.render(context)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/template/base.py" in render
  823.                 bit = self.render_node(node, context)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/template/debug.py" in render_node
  74.             return node.render(context)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/template/defaulttags.py" in render
  411.             url = reverse(view_name, args=args, kwargs=kwargs, current_app=context.current_app)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/core/urlresolvers.py" in reverse
  476.     return iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs))
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/core/urlresolvers.py" in _reverse_with_prefix
  363.         possibilities = self.reverse_dict.getlist(lookup_view)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/core/urlresolvers.py" in reverse_dict
  276.             self._populate()
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/core/urlresolvers.py" in _populate
  253.                     for name in pattern.reverse_dict:
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/core/urlresolvers.py" in reverse_dict
  276.             self._populate()
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/core/urlresolvers.py" in _populate
  265.                 lookups.appendlist(pattern.callback, (bits, p_pattern, pattern.default_args))
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/core/urlresolvers.py" in callback
  216.         self._callback = get_callable(self._callback_str)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/utils/functional.py" in wrapper
  27.         result = func(*args)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/core/urlresolvers.py" in get_callable
  92.                 lookup_view = getattr(import_module(mod_name), func_name)
File "/Users/NB/Desktop/myenv2/lib/python2.7/site-packages/django/utils/importlib.py" in import_module
  35.     __import__(name)

Exception Type: SyntaxError at /
Exception Value: invalid syntax (views.py, line 804)
4

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