如何将我的“namedtuple”结构与“pickle”一起使用？

Question

我用创建了字典的元组

from collections import namedtuple
import random
demand={}
Site_Product=namedtuple("Site_Product", ["site", "product"])   
Products=['P1','P2','P3']    
for P in Products:
    for node in range(1,4): #Suppliers:
        sp=Site_Product(site=node, product=P)
        demand={sp:random.normalvariate(30, 25)}

然后我想保存这些文件，以备以后使用，如下所示：

^{pr2}$

我有一堆错误主要指向我的namedtuple结构：

  File "C:\Users\Ozgu\Anaconda2\lib\pickle.py", line 1376, in dump
    Pickler(file, protocol).dump(obj)

  File "C:\Users\Ozgu\Anaconda2\lib\pickle.py", line 224, in dump
    self.save(obj)

  File "C:\Users\Ozgu\Anaconda2\lib\pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self

  File "C:\Users\Ozgu\Anaconda2\lib\pickle.py", line 655, in save_dict
    self._batch_setitems(obj.iteritems())

  File "C:\Users\Ozgu\Anaconda2\lib\pickle.py", line 668, in _batch_setitems
    save(k)

  File "C:\Users\Ozgu\Anaconda2\lib\pickle.py", line 331, in save
    self.save_reduce(obj=obj, *rv)

  File "C:\Users\Ozgu\Anaconda2\lib\pickle.py", line 401, in save_reduce
    save(args)

  File "C:\Users\Ozgu\Anaconda2\lib\pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self

  File "C:\Users\Ozgu\Anaconda2\lib\pickle.py", line 568, in save_tuple
    save(element)

  File "C:\Users\Ozgu\Anaconda2\lib\pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self

  File "C:\Users\Ozgu\Anaconda2\lib\pickle.py", line 754, in save_global
    (obj, module, name))

PicklingError: Can't pickle \<class '__main__.Site_Product'\>: it's not found as __main__.Site_Product

有没有一种方法可以让我保留元组的dict（对于键），或者以一种廉价的方式记录数据，以便它们能够共存？

Answer 1

结果是，我用两个不同的函数定义代码。把它们结合起来很可能解决问题。在