I have a class Vector where:

class Vector(Symbol):

    def __init__(self,basis_str=None):
        if isinstance(basis_str,Vector):
            self = basis_str
        else:
            if basis_str == None or basis_str == '0':
                self = S(0)
            else:
                Symbol.__init__(self,basis_str,commutative=False)
                print self
                print self.is_commutative

then:

er = Vector('er')

outputs my diagnostic print -

er
True

How do I subclass and get self.is_commutative = False?

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