Python:NameError:未定义'self'

Question

我一定是在做一些愚蠢的事.我在Google App Engine中运行它:

class MainHandler(webapp.RequestHandler):

    def render(self, template_name, template_data):
        path = os.path.join(os.path.dirname(__file__), 'static/templates/%s.html' % template_name)
        self.response.out.write(template.render(path, template_data)) # error here

    def get(self):
        self.response.out.write("hi")

def main():
    application = webapp.WSGIApplication([('/', MainHandler)],
                                        debug=True)
    util.run_wsgi_app(application)


if __name__ == '__main__':
    main()

这给出了一个错误:

Traceback (most recent call last):
  File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 3192, in _HandleRequest
    self._Dispatch(dispatcher, self.rfile, outfile, env_dict)
  File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 3135, in _Dispatch
    base_env_dict=env_dict)
  File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 516, in Dispatch
    base_env_dict=base_env_dict)
  File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 2394, in Dispatch
    self._module_dict)
  File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 2304, in ExecuteCGI
    reset_modules = exec_script(handler_path, cgi_path, hook)
  File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 2200, in ExecuteOrImportScript
    exec module_code in script_module.__dict__
  File "main.py", line 22, in <module>
    class MainHandler(webapp.RequestHandler):
  File "main.py", line 38, in MainHandler
    self.writeOut(template.render(path, template_data))
NameError: name 'self' is not defined

我究竟做错了什么？

Answer 1

在定义类时会发生异常,这意味着您的缩进已关闭.Python中的选项卡相当于8个空格,因此如果前面的所有行都使用制表符并且tabstop设置为4个空格,则缩进只能看起来正确.