I'm having trouble with the construction of a list of vector spaces
with the Sequence() command.
Is this a bug, or misuse/abuse? Failure, followed by a bit of a
workaround.
sage: T=[QQ^2, QQ^2]
sage: Sequence(T)
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/sage/notebook/devel/sage-main/<ipython console> in <module>()
/sage/notebook/local/lib/python2.6/site-packages/sage/structure/
sequence.pyc in Sequence(x, universe, check, immutable, cr, cr_str,
use_sage_types)
298 return Sequence_generic(x, universe, check,
immutable, cr, cr_str, use_sage_types)
299 else:
--> 300 return Sequence_generic(x, universe, check, immutable,
cr, cr_str, use_sage_types)
301
302 class Sequence_generic(sage.structure.sage_object.SageObject,
list):
/sage/notebook/local/lib/python2.6/site-packages/sage/structure/
sequence.pyc in __init__(self, x, universe, check, immutable, cr,
cr_str, use_sage_types)
502 self.__universe = universe
503 if check:
--> 504 x = [universe(t) for t in x]
505 list.__init__(self, x)
506 self._is_immutable = immutable
TypeError: __init__() takes at least 3 arguments (2 given)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sage: Sequence(T, check=False)
[Vector space of dimension 2 over Rational Field, Vector space of
dimension 2 over Rational Field]
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