En Fri, 17 Jul 2009 21:43:21 -0300, Zac Burns <zac...@gmail.com> escribió:
I have a large pickle file, which happens to be a list with lots of objects in it. What sort of things can I do without unpickling the whole object? I would particularly like to retrieve one of the elements in the list without unpicking the whole object.
I'm afraid you can't do that, in general. A pickle is actually *code* for a stack-based machine; you have to execute all the previous instructions to have a sane stack contents; it's not possible (at least, not easily) just to jump in the middle of the pickle and execute just a section.
If the answer is not specific to lists that would be useful (works on getting items in a dictionary, or doing introspection on the objects or whatever)
The pickletools module might be a starting point: http://docs.python.org/library/pickletools.html -- Try the Python Cookbook too http://code.activestate.com/recipes/langs/python/
-- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
