[yt-users] pickle

[Elizabeth Tasker]

Hi,

(Another day a different problem!): I'd like to pickle the results from 
extract_connected_sets, but I can't seem to retrieve what I pickle 
properly. I have:

contours = dd.extract_connected_sets("NegEscapeVelocity", 1, 30.0, maxv, 
log_space=False)
cloudcores = contours[1][0] #cores defined by contour 0

file = open('testa.pickle','wb')
cPickle.dump(cloudcores,file,protocol=-1)
file.close()

file = open('testa.pickle','rb')
core = cPickle.load(file)
file.close()

But while:

In [76]: cloudcores[40]["Density"]
Out[76]:
array([  3.80336226e-23,   4.31254788e-23,   3.87927154e-23, ...,
         1.26533774e-22,   2.13753864e-22,   2.74680682e-22])



In [77]: core[40]["Density"]
---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)

/1/home/taskere/yt/scripts/iyt in <module>()
----> 1
      2
      3
      4
      5

KeyError: 40


Is it not possible to pickle a contour object or is there something else 
I have to do when un-pickling?

Thank you,

Elizabeth