On Friday, December 6, 2013 7:51:35 AM UTC-8, kcrisman wrote:
> > Just for the record, this wasn't my question :) but hopefully the user > accepts it, thanks for this (which in retrospect I should have diagnosed as > well, as I have used load/save but thought they were the same as the > "usual" pickle). > For the most part, dumps(X) amounts to cPickle.dumps(X,protocol=2) and then by default further compression. The protocol makes quite a difference in the way objects are pickled, though, and a lot of sage implements pickling by assuming that protocol==2. I was tripped up by that a couple of times. For instance, while it seems from sage's implementation, typing sage: LaurentPolynomialRing(QQ,'x').__reduce__() should give a reasonable indication of how it gets pickled, it does not: sage: LaurentPolynomialRing(QQ,'x').__reduce__()[0] <function copy_reg._reconstructor> sage: LaurentPolynomialRing(QQ,'x').__reduce_ex__(2)[0] <function copy_reg.__newobj__> The latter is what actually gets executed. -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/groups/opt_out.
