#13459: spkg/bin/sage: do not change directory
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Reporter: jdemeyer | Owner: leif
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.4
Component: scripts | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Jeroen Demeyer | Merged in:
Dependencies: | Stopgaps:
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Comment (by jdemeyer):
Replying to [comment:7 jhpalmieri]:
> Can you explain the change in sage-ipython? I don't see any lines
corresponding to `import sage` in the old version. I guess I don't know
the mechanics of how sage gets imported when you run `sage` from the
command line.
When running Sage through IPython (but not through plain Python when
running a script for example), the current working directory is always
added to `sys.path` (the empty string is added as zeroth entry, which
means the current working directory). So when doing
{{{
import sage # or sage.foo.bar....
}}}
the ''current working directory'' will be checked first for the existence
of a "sage" module. If the current working directory happens to be
`$SAGE_ROOT/devel/sage`, that contains a "sage" subdirectory which Python
will happily import. But this is the wrong directory, it should be
imported from `site-packages` instead. This creates problems for Cython
modules, as these exist ''only'' in `site-packages`.
So we avoid this problem by first fixing `sys.path`, then importing Sage
so any future imports of Sage submodules will work fine.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13459#comment:8>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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