Google App Engine 有效负载对象

如何在Python中的任务有效负载中发送类对象？我想在任务的参数中发送一个对象。
当我使用simplejson，我收到错误：Object is not serializable.
当我使用pickle时，我得到KeyValue Error.
这个怎么做 ？

这是我要序列化的类

class Matrix2D_icfg:
name = ""
indices = []
value = {}
def __init__(self,s):
    self.name = s
    self.indices = []
def __getitem__(self,i):
    self.indices.append(i)
    if len(self.indices)==2:
        (m,n) = self.indices
        self.indices = []
        if self.value.has_key(m*4276+n) == True :
            value = self.value[m*4276+n]
        else :
            value = 0
        return value
    else: return self

def __setitem__(self,i,value):
    self.indices.append(i)      
    if len(self.indices)==2:
        (m,n) = self.indices
        if value != 0 : self.value[m*4276+n] = value
        self.indices = []
    return self

icfg = Matrix2D_icfg("icfg") #declaring object
icfg_compress = pickle.dumps(icfg) #to pickle

icfg = pickle.loads(icfg_compress) # to unload

当我将 pickled 对象作为有效负载传递并稍后卸载时，出现以下错误

File "/Users/praveensekar/myFYP/gaecode/pknots4d.2.3/pknots.py", line 439, in post
    icfg = pickle.loads(icfg_compress)
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/pickle.py", line 1374, in loads
    return Unpickler(file).load()
  File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/pickle.py", line 858, in load
    dispatch[key](self)
KeyError: '\x00'  

问题在于卸载的数据类型。我将其转换为 str 类型，一切似乎都正常工作。 我刚刚将其更改为

icfg = Matrix2D_icfg("icfg") #declaring object
icfg_compress = pickle.dumps(icfg) #to pickle

icfg = pickle.loads(str(icfg_compress)) # to unload