#19385: Refactor DiGraph.__init__
-------------------------+-------------------------------------------------
Reporter: | Owner:
ncohen | Status: needs_review
Type: | Milestone: sage-6.9
enhancement | Resolution:
Priority: major | Merged in:
Component: graph | Reviewers:
theory | Work issues:
Keywords: | Commit:
Authors: | cf53613abb473f53411b50bd2ddc049050cd6dbc
Nathann Cohen | Stopgaps:
Report Upstream: N/A |
Branch: |
u/ncohen/19385 |
Dependencies: |
#19381 |
-------------------------+-------------------------------------------------
Comment (by SimonKing):
Replying to [comment:1 ncohen]:
> {{{
> File "digraph.py", line 2671, in
sage.graphs.digraph.DiGraph.path_semigroup
> Failed example:
> F = Q.path_semigroup(); F
> Exception raised:
> ...
> File "sage/misc/cachefunc.pyx", line 563, in genexpr
(build/cythonized/sage/misc/cachefunc.c:2439)
> return tuple(_cache_key(item) for item in o)
> File "sage/misc/cachefunc.pyx", line 561, in
sage.misc.cachefunc._cache_key
(build/cythonized/sage/misc/cachefunc.c:2644)
> o = o._cache_key()
> File "sage/structure/sage_object.pyx", line 410, in
sage.structure.sage_object.SageObject._cache_key
(build/cythonized/sage/structure/sage_object.c:2918)
> raise TypeError("{} is not hashable and does not implement
_cache_key()".format(type(self)))
> TypeError: <class 'sage.graphs.digraph.DiGraph'> is not hashable and
does not implement _cache_key()
> **********************************************************************
> }}}
I'll have a look. Obviously, we should either use an immutable version of
a digraph, or (something which seems to be new) implement _cache_key.
--
Ticket URL: <http://trac.sagemath.org/ticket/19385#comment:2>
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