(self)
return self.args[0]
Return the ket on the left side of the outer product.
Return the ket on the left side of the outer product.
Return the ket on the left side of the outer product .
def ket(self):
        """Return the ket on the left side of the outer product."""
        return self.args[0]
def ket ( self ) : return self . args [ 0 ]