#6491: [with spkg, needs review] Modular Cohomology Rings of Finite p-Groups
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Reporter: SimonKing | Owner: SimonKing
Type: enhancement | Status: assigned
Priority: major | Milestone: sage-4.1.1
Component: optional packages | Keywords: cohomology ring finite p-group
Reviewer: | Author: Simon King
Merged: |
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Comment(by SimonKing):
Replying to [comment:39 wdj]:
> ImportError: No module named pGroupCohomology
OK, then something very fundamental went wrong.
> {{{
> zeus:~/sagefiles/sage-4.1.1.alpha0 davidjoyner$ ls local/lib/python2.6
/site-packages/p_*
> ls: local/lib/python2.6/site-packages/p_*: No such file or directory
> }}}
It should not be p_* but pG*:
There is a difference between the name of the spkg
(p_group_cohomology-1.0.1) and the name of the extension module it
provides (pGroupCohomology, and this is also how the folder in site-
packages is called). Compare this with another optional spkg: The spkg is
called pil-1.1.6, but the module is PIL.
Nevertheless, if it can't be imported then it's bad. Is there any
informative error message if you start a sage session and try manually
{{{
sage: import pGroupCohomology
}}}
that tells at what point the problem occurs?
> > I guess the Macbook thing should be understood (although, as I
mentioned, it was expected that Macbook is a problem).
>
>
> I think you are right. It is strange that installation does not trigger
an error though, isn't it?
Yes, but sometimes strange things can happen. For example, on one of my
machines, the build process failed for no apparent reason; then I tried
again, and it simply worked. Is it the same sage installation on which you
installed the previous version of our spkg? On my machines, I did not
experience a conflict when installing one version after the other; but
perhaps this is different on a Macbook?
Please try to install the package again (with sage -f instead of sage -i),
try to save the text output during the build process into a file, and
provide a link to it. Perhaps it gives some clue. Perhaps it is useful to
remove p_group_cohomology*.spkg from SAGE_ROOT/spkg/optional before doing
the installation: In that way it is forced to download the sources again.
There is the possibility that it "simply works" when you try the
installation a second time. If not: You might remove
SAGE_ROOT/local/lib/python2.6/site-packages/pGroupCohomoloy* and try again
(this is to avoid conflict with previous builds).
Unfortunately I have no access to Macbooks, so, I can't try myself.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6491#comment:40>
Sage <http://sagemath.org/>
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