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POWhy can't I pickle this object?
 

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  1. POWhy can't I pickle this object?
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    <p>I have a class (below):</p> <pre><code>class InstrumentChange(object): '''This class acts as the DTO object to send instrument change information from the client to the server. See InstrumentChangeTransport below ''' def __init__(self, **kwargs): self.kwargs = kwargs self._changed = None def _method_name(self, text): return text.replace(' ','_').lower() def _what_changed(self): ''' Denotes the column that changed on the instrument returning the column_name of what changed.''' if not self._changed: self._changed = self._method_name(self.kwargs.pop('What Changed')) return self._changed def __getattr__(self, attr): for key in self.kwargs.iterkeys(): if self._method_name(key) == attr: return self.kwargs[key] def __str__(self): return "Instrument:%s" % self.kwargs __repr__ = __str__ what_changed = property(_what_changed) </code></pre> <p>When I run the following test:</p> <pre><code>def test_that_instrumentchangetransport_is_picklable(self): test_dict = {'Updated': 'PAllum', 'Description': 'BR/EUR/BRAZIL/11%/26/06/2017/BD', 'Ask Q': 500, 'Bbg': 'On', 'C Bid': 72.0, 'Benchmark': 'NL/USD/KKB/7.000%/03/11/2009/BD', 'ISIN': 'XS0077157575', 'Bid YTM': 0.0, 'Bid Q': 100, 'C Ask': 72.25, 'Ask YTM': 0.0, 'Bid ASW': 0.0, 'Position': 1280000, 'What Changed': 'C Bid', 'Ask ASW': 0.0} ins_change = InstrumentChangeTransport(**test_dict) assert isinstance(ins_change, InstrumentChangeTransport) # Create a mock filesystem object file = open('testpickle.dat', 'w') file = Mock() pickle.dump(ins_change, file) </code></pre> <p>I get:</p> <pre><code>Traceback (most recent call last): File "c:\python23\lib\site-packages\nose-0.11.0-py2.3.egg\nose\case.py", line 183, in runTest self.test(*self.arg) File "C:\Code\branches\demo\tests\test_framework.py", line 142, in test_that_instrumentchangetransport_is_picklable pickle.dump(ins_change, file) File "C:\Python23\Lib\copy_reg.py", line 83, in _reduce_ex dict = getstate() TypeError: 'NoneType' object is not callable </code></pre> <p>I've looked at the pickle docs, but I don't quite get it.</p> <p>Any ideas?</p> <p>Ben</p>
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    1. USBen Hughes
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    1. COAs a side note: 'key in self.kwargs.iterkeys()' generates a list of keys and searches through them. Better use 'key in self.kwargs', which tries to do a hashtable lookup (faster).
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    2. COWhen asking for help debugging something, it helps to provide enough code to reproduce the problem. It helps even more to delete everything irrelevant from the code you post.
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      1. USJason Orendorff
 

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