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
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