Thanks to all who have responded. My template now looks like:
class Foo(Element):
def __init__(self,a):
self.data = a
def __repr__(self):
return str(self.data)
class Foos(Parent, UniqueRepresentation):
# This class represents the set of all Foo's
def __contains__(self,f):
return isinstance(f,Foo)
Element = Foo
FreeM = CombinatorialFreeModule(QQ,Foo)
One problem is that
s = Foo(1)
and then trying to inspect using s.Tab gives
AttributeError: 'NoneType' object has no attribute 'category'
and FreeM(s) gives
TypeError: No conversion defined from None to Free module generated by
<class '__main__.Foo'> over Rational Field
However FreeM.monomial(s) does work
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