Hi folks,
The situation with weighted() is even more bizarre:
sage: version()
'Sage Version 4.6.1.alpha3, Release Date: 2010-12-05'
sage: G = Graph({1:{2:3}})
sage: G.weighted()
False
sage: G.weighted('a')
sage: G.weighted()
'a'
sage: G.weighted(True)
sage: G.weighted()
True
Python recognizes a nonempty string as equivalent to True, but the
above behaviour is confusing. I would expect the valid input to be a
boolean from [True, False]. A patch is up at ticket #10490
http://trac.sagemath.org/sage_trac/ticket/10490
to fix this bug and to allow for setting a weighted graph as unweighted.
--
Regards
Minh Van Nguyen
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