pickle error - 'module' object has no attribute '_reconstruct'

[Skip Montanaro]

Skip Montanaro <skip <at> pobox.com> writes:

> 
> Saw a new-to-me error today when trying to unpickle a moderately large
> object (about 500k):
> 
>     AttributeError: 'module' object has no attribute '_reconstruct'

I believe I have it figured out.  Most of the pickled data consists of
numpy arrays.  It appears I picked up an ancient version of numpy when
I got the failure.

S