Dear folks,
I implemented "symmetric polynomial rings" and "symmetric ideals" in
two python files ``symmetric_polynomial.py`` and
``symmetric_ideal.py``. When I attach ``symmetric_polynomial.py``,
everything works just fine (the class from the second file is imported
by the first).
The problems start when I copy these files into sage.rings.polynomial,
and update all.py by adding the line
from sage.rings.polynomial.symmetric_polynomial import
SymmetricPolynomialRing
After sage -br, I obtain:
ImportError Traceback (most recent call
last)
/home/king/SAGE/devel/sage-3.2.3/local/lib/python2.5/site-packages/
IPython/ipmaker.pyc in force_import(modname)
...
ImportError: cannot import name PolynomialRing
Error importing ipy_profile_sage - perhaps you should run %upgrade?
WARNING: Loading of ipy_profile_sage failed.
The imports in symmetric_polynomial.py are:
import sage
import sage.all
from sage.rings.polynomial.polynomial_ring_constructor import
PolynomialRing
from sage.rings.integer_ring import ZZ
from sage.structure.element import RingElement
from sage.rings.ring import CommutativeRing, Ring
from sage.rings.commutative_ring import is_CommutativeRing
from sage.structure.all import Parent, SageObject
from sage.structure.factory import UniqueFactory
from sage.rings.polynomial.infinite_polynomial import
InfinitePolynomialRing_class
from sage.misc.cachefunc import cached_method
from sage.misc.misc import prod
from sage.combinat.permutation import Permutation
import copy, operator
Interestingly, a previous version of that file was successfully
installed into sage.rings.polynomial, and it imported:
from sage.rings.polynomial.polynomial_ring_constructor import
PolynomialRing
from sage.rings.integer_ring import ZZ
from sage.structure.element import RingElement
from sage.rings.ring import Ring
from sage.structure.all import Parent, SageObject
from sage.structure.factory import UniqueFactory
from sage.misc.cachefunc import cached_method
import copy, operator
Can you explain to me why it works to attach the file, while an import
by sage/rings/polynomial/all.py fails?
Thank you very much in advance
Simon
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