[ python-Bugs-839075 ] Document that highly recursive data cannot be pickled

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Bugs item #839075, was opened at 2003-11-10 07:21
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Category: Documentation
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Simon David Burton (simonb1)
Assigned to: Nobody/Anonymous (nobody)
Summary: Document that highly recursive data cannot be pickled

Initial Comment:

Make a note in section 3.4.14 Python Library Reference
(perhaps a footnote?) that higly recursive data
stuctures cannot be pickled. Setting the stack limit
helps a bit, but does not scale to large networks of data.

eg.

#!/usr/bin/env python

import cPickle as pickle
#import pickle
import os
#sys.setrecursionlimit(4000)

N = 2048
print "building..."
nest = [ [] for i in range(N) ]
for i in range(N):
  for j in range(N):
    nest[i].append( nest[j] )

print "dumping..."
file = open("nest.pkl","wb")
try:
  pickle.dump( nest, file )
except RuntimeError, e:
  print e



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