#15130: Docbuilder issue with BasisExchangeMatroid
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Reporter: jdemeyer | Owner:
Type: defect | Status: new
Priority: critical | Milestone: sage-5.13
Component: documentation | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by vbraun):
Btw, here is a quick tutorial to debug this. Use the `-v` switch to
display imports as they happen:
{{{
sage -python -v
>>> from sage.all import *
>>> from sage.matroids.basis_exchange_matroid import BasisExchangeMatroid
dlopen("/home/vbraun/Code/sage.git/local/lib/python2.7/site-
packages/sage/matroids/basis_exchange_matroid.so", 2);
dlopen("/home/vbraun/Code/sage.git/local/lib/python2.7/site-
packages/sage/matroids/matroid.so", 2);
dlopen("/home/vbraun/Code/sage.git/local/lib/python2.7/site-
packages/sage/matroids/set_system.so", 2);
import sage.matroids.set_system # dynamically loaded from
/home/vbraun/Code/sage.git/local/lib/python2.7/site-
packages/sage/matroids/set_system.so
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "basis_exchange_matroid.pyx", line 1, in init
sage.matroids.basis_exchange_matroid
(sage/matroids/basis_exchange_matroid.c:20420)
File "basis_exchange_matroid.pxd", line 8, in init sage.matroids.matroid
(sage/matroids/matroid.c:33184)
AttributeError: 'module' object has no attribute 'BasisExchangeMatroid'
}}}
So matroid imports from basis_exchange_matroid and vice versa. Which is
bad. Circular imports are no magic, they just require Python to work with
half-initialized module dicts. So while basis_exchange_matroid is loading,
the `BasisExchangeMatroid` is not in the module namespace.
--
Ticket URL: <http://trac.sagemath.org/ticket/15130#comment:3>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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