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<p>有些事情让我有点困惑。。。在</p>
<pre><code>>>> from django.core.cache import get_cache
>>>
>>> cache = get_cache('django.core.cache.backends.locmem.LocMemCache')
>>>
>>> # Set the 'content' cache key to a string
>>> cache.set('content', 'a string')
>>> cache.get('content')
'a string'
>>>
>>> class TestObj(object):
... pass
>>>
>>> a = TestObj()
>>> cache.set('content', a)
>>>
>>> # cache hasn't updated...
>>> cache.get('content')
'a string'
>>>
>>> cache.set('content', 1)
>>> # this is fine however..
>>> cache.get('content')
1
>>>
</code></pre>
<p>好的,缓存由于某种原因不接受对象。在</p>
^{pr2}$
<p>这就是为什么,很明显,它碰到了pickle错误</p>
<pre><code>>>> import pickle
>>> pickled = pickle.dumps(a, pickle.HIGHEST_PROTOCOL)
Traceback (most recent call last):
File "<input>", line 1, in <module>
File "/usr/lib/python2.7/pickle.py", line 1374, in dumps
Pickler(file, protocol).dump(obj)
File "/usr/lib/python2.7/pickle.py", line 224, in dump
self.save(obj)
File "/usr/lib/python2.7/pickle.py", line 331, in save
self.save_reduce(obj=obj, *rv)
File "/usr/lib/python2.7/pickle.py", line 396, in save_reduce
save(cls)
File "/usr/lib/python2.7/pickle.py", line 286, in save
f(self, obj) # Call unbound method with explicit self
File "/usr/lib/python2.7/pickle.py", line 748, in save_global
(obj, module, name))
PicklingError: Can't pickle <class 'TestObj'>: it's not found as __builtin__.TestObj
</code></pre>
<p>当然,但为什么会这样?它在python控制台中工作得很好,但在djangoshell中就不行了?在</p>
<pre><code># Works fine in python shell...
>>> import pickle
>>> class TestObj(object):
... pass
...
>>> testobj = TestObj()
>>> pickled = pickle.dumps(testobj, pickle.HIGHEST_PROTOCOL)
>>> pickled
'\x80\x02c__main__\nTestObj\nq\x00)\x81q\x01}q\x02b.'
>>>
</code></pre>
<p>出现这个问题是因为我试图在缓存中存储一个Mock()对象以进行测试。不知道我是不是走错了路。。。在</p>