[ python-Bugs-1693079 ] Can't save empty array in shelve

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Bugs item #1693079, was opened at 2007-04-02 18:19
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Category: Python Library
Group: Python 2.5
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: IWL (iwl)
Assigned to: Nobody/Anonymous (nobody)
Summary: Can't save empty array in shelve

Initial Comment:

iwl wrote: 
> I've tryed to save some data containing empty arrays (array('f')) in a 
> shelve. 
> It looks like the shelve has some problems with empty arrays, get 
> allways: 
> TypeError: ("'NoneType' object is not iterable", <type 'array.array'>, 
> ('f', None))- 
> Messages when dealing with the readed back shelve. 
> Seems like I have to avoid empty arrays in a shelve. 


That seems to be a bug in the underlying pickling mechanism: 


>>> from array import array 
>>> from cPickle import loads, dumps 
>>> loads(dumps(array("f", [1]))) 
array('f', [1.0]) 
>>> loads(dumps(array("f"))) 


Traceback (most recent call last): 
  File "<stdin>", line 1, in <module> 
TypeError: ("'NoneType' object is not iterable", <type 'array.array'>, ('f', 
None)) 

Please submit a bug report. 


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https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1693079&group_id=5470