#10963: More functorial constructions
-------------------------------------+-------------------------------------
       Reporter:  nthiery            |        Owner:  stumpc5
           Type:  enhancement        |       Status:  needs_work
       Priority:  major              |    Milestone:  sage-6.1
      Component:  categories         |   Resolution:
       Keywords:  days54             |    Merged in:
        Authors:  Nicolas M. Thiéry  |    Reviewers:  Simon King, Frédéric
Report Upstream:  N/A                |  Chapoton
         Branch:                     |  Work issues:  Detect and fix
  public/ticket/10963                |  Heisenbugs
   Dependencies:  #11224, #8327,     |       Commit:
  #10193, #12895, #14516, #14722,    |  5ccf253b17c151d8e773037ac634a64f84f03075
  #13589, #14471, #15069, #15094,    |     Stopgaps:
  #11688, #13394, #15150, #15506     |
-------------------------------------+-------------------------------------

Comment (by SimonKing):

 PPS: I think I understand why the code is finishing at all. The "assert"
 statement involves importing something. Hence, it may fail with an
 `ImportError`. This is caught (`except (ImportError,AttributeError)`), in
 which case the axiom under consideration is skipped.

 In the worst case, this means that the ''correct'' axiom is skipped, so
 that eventually ` TypeError("Could not retrieve base category class for
 %s"%cls)` is raised.

--
Ticket URL: <http://trac.sagemath.org/ticket/10963#comment:253>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
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