[Numpy-tickets] [NumPy] #897: Numpy mrecords - unpickle causes unhandled win32 exception

NumPy numpy-tickets@scipy....
Wed Jan 7 17:04:48 CST 2009

#897: Numpy mrecords - unpickle causes unhandled win32 exception
 Reporter:  chrisshucksmith  |        Owner:  pierregm
     Type:  defect           |       Status:  assigned
 Priority:  normal           |    Milestone:  1.3.0   
Component:  numpy.ma         |      Version:  none    
 Severity:  major            |   Resolution:          
 Keywords:                   |  
Changes (by pierregm):

  * status:  new => assigned


 OK, there's indeed something broken here, but I can't fix it for the
 moment. Any array with some np.object in the dtype will fail, no matter
 how simple the dtype is. Looks like the corresponding data should be
 exported as a list instead of a string in __reduce__. Fixing this could be
 problematic if there are several fields.

 There's a workaround of some sorts, however:

 1. use the `.torecords` (now called `.toflex`) method to transform the
 MaskedArray into a ndarray with flexible dtype.

 2. pickle the output.

 3. use the `fromflex` function to get a masked_array from the unpickled

Ticket URL: <http://scipy.org/scipy/numpy/ticket/897#comment:1>
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