为什么这个python方法会出错,说全局名称没有定义？

Question

我的Google App Engine项目只有一个代码文件.这个简单的文件有一个类,里面有几个方法.为什么这个python方法会出错,说全局名称没有定义？
Erro NameError:未定义全局名称"gen_groups"

import wsgiref.handlers


from google.appengine.ext import webapp
from django.utils import simplejson

class MainHandler(webapp.RequestHandler):

  def gen_groups(self, lines):
    """ Returns contiguous groups of lines in a file """

    group = []

    for line in lines:
      line = line.strip()
      if not line and group:
        yield group
        group = []
      elif line:
          group.append(line)

  def gen_albums(self, groups):
   """ Given groups of lines in an album file, returns albums  """

   for group in groups:
      title    = group.pop(0)
      songinfo = zip(*[iter(group)]*2)
      songs    = [dict(title=title,url=url) for title,url in songinfo]
      album    = dict(title=title, songs=songs)

      yield album





  def get(self):
    input = open('links.txt')
    groups = gen_groups(input)
    albums = gen_albums(groups)

    print simplejson.dumps(list(albums))



def main():
  application = webapp.WSGIApplication([('/', MainHandler)],
                                       debug=True)
  wsgiref.handlers.CGIHandler().run(application)


if __name__ == '__main__':
  main()

Answer 1

这是一个实例方法,你需要使用self.gen_groups(...)和self.gen_albums(...).

编辑:我猜TypeError你现在得到的是因为你删除了'自我'的论点gen_groups().你需要把它放回去:

def get_groups(self, lines):
    ...