deferred.defer的显示PermanentTaskFailure：最大递归深度超过

Question

我想从一个CSV文件导入所有数据，并将其存储到数据存储以csv文件..其中app定义

__init__.py文件。

@app.route("/import/<model>", methods=['POST']) 
def import_csv(model): 
    reader = UsersImporter(fil, user) 
    reader.read() 

importers.py

class UsersImporter(BaseImporter): 
    def read(self): 
     line = self.file.readline() 
     self.checking_delimiter_on_first_line(line) 
     self.file.seek(0) 
     reader = csv.DictReader(self.file, delimiter=self.delimiter) 
     try: 
      for row in reader: 
       deferred.defer(self.parse_line, row) 
     except: 
      print traceback.format_exc() 
     self.insert_entities() 

以上代码生成下面回溯。

INFO  2016-12-26 08:00:09,745 deferred.py:303] X-Appengine-Current-Namespace:, X-Appengine-Taskexecutioncount:0, X-Appengine-Country:ZZ, X-Appengine-Taskname:task8, X-Appengine-Taskretrycount:0, X-Appengine-Queuename:default, X-Appengine-Tasketa:1482739209.69 
ERROR 2016-12-26 08:00:09,749 deferred.py:319] Permanent failure attempting to execute task 
Traceback (most recent call last): 
    File "/home/gemini/softwares/google_appengine/google/appengine/ext/deferred/deferred.py", line 310, in post 
    self.run_from_request() 
    File "/home/gemini/softwares/google_appengine/google/appengine/ext/deferred/deferred.py", line 305, in run_from_request 
    run(self.request.body) 
    File "/home/gemini/softwares/google_appengine/google/appengine/ext/deferred/deferred.py", line 145, in run 
    raise PermanentTaskFailure(e) 
PermanentTaskFailure: maximum recursion depth exceeded 

你看，row不是requestHandler类的一个实例。 self.parse_line也是BaseImporter中定义的一种方法。

Answer 1

它在移动parse_line函数之外的类之后有效。即，作为defferred.defer func的第一个参数传递的函数不会是实例方法。