Hi, I don't know about your import error. But I just wanted to say than unordered trees were implemented a while ago but never finished...
Here's the ticket: http://trac.sagemath.org/ticket/11529 I'm not saying you should use those, maybe it's better to start from scratch, but it's always good to know it exists! By the way, ot's something that would be very cool to have. Best, Viviane 2015-02-10 12:50 GMT+01:00 Henrik Sperre Sundklakk < henrik.sundkl...@gmail.com>: > I am implementing unordered rooted trees in Sage (to use them in > B-series). When trying to iinherit from > sage.combinat.abstract_tree.AbstractClonableTree I get an ImportError. > > I have successfully called OrderedTrees() from the notebook, so my Sage > installation is sound. The problem occurs when I use Eclipse. > > I launch Eclipse from the Sage shell, and use the Python interpreter > provided by Sage (/usr/lib/sagemath/local/bin/python2.7). I keep my .py > files in a directory in my SAGE_PATH. I have successfully imported and > inherited from classes in Sage (ClonableElement). This code runs, both in > Eclipse and the nootebook. > > However, the following line, even when it is the only line in a file, > elicit the following error (as does all attempts to import anything > depending on "abstrac_tree"): > > import sage.combinat.abstract_tree > > Traceback (most recent call last): > File > "/home/henrik/Documents/studier/masteroppgave/code/pybs/pybs/scratch2.py", > line 5, in <module> > import sage.combinat.abstract_tree# import AbstractClonableTree > File > "/usr/lib/sagemath/local/lib/python2.7/site-packages/sage/combinat/abstract_tree.py", > line 67, in <module> > from sage.rings.integer import Integer > File "sage/rings/rational.pxd", line 10, in init sage.rings.integer > (build/cythonized/sage/rings/integer.c:41630) > File "sage/rings/rational.pyx", line 56, in init sage.rings.rational > (build/cythonized/sage/rings/rational.c:30843) > File > "/usr/lib/sagemath/local/lib/python2.7/site-packages/sage/rings/rational_field.py", > line 55, in <module> > import infinity > File > "/usr/lib/sagemath/local/lib/python2.7/site-packages/sage/rings/infinity.py", > line 213, in <module> > from sage.rings.integer_ring import ZZ > File "sage/rings/integer_ring.pyx", line 67, in init > sage.rings.integer_ring (build/cythonized/sage/rings/integer_ring.c:11566) > File > "/usr/lib/sagemath/local/lib/python2.7/site-packages/sage/structure/factorization.py", > line 188, in <module> > from sage.misc.all import prod > File > "/usr/lib/sagemath/local/lib/python2.7/site-packages/sage/misc/all.py", > line 89, in <module> > from functional import (additive_order, > File > "/usr/lib/sagemath/local/lib/python2.7/site-packages/sage/misc/functional.py", > line 36, in <module> > from sage.rings.complex_double import CDF > File "sage/rings/real_double.pxd", line 8, in init > sage.rings.complex_double > (build/cythonized/sage/rings/complex_double.c:20095) > File "sage/rings/real_double.pyx", line 56, in init > sage.rings.real_double (build/cythonized/sage/rings/real_double.c:22825) > ImportError: cannot import name ZZ > > Since recursive trees work from the notebook, I guess the problem is me > doing something wrong trying to import it, but I can't think of what it > is... > > Regards, > Henrik S. Sundklakk > > -- > You received this message because you are subscribed to the Google Groups > "sage-combinat-devel" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sage-combinat-devel+unsubscr...@googlegroups.com. > To post to this group, send email to sage-combinat-devel@googlegroups.com. > Visit this group at http://groups.google.com/group/sage-combinat-devel. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-combinat-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-combinat-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-combinat-devel. For more options, visit https://groups.google.com/d/optout.
