core.py 文件源码

def expr(self):
        """
        Process the term, by returning a sympy expression
        """
        if DEBUG:
            print("> Term ")

        ret = self.op[0].expr
        for operation, operand in zip(self.op[1::2], self.op[2::2]):
            if operation == '*':
                ret = Mul(ret, operand.expr)
            else:
                a   = Pow(operand.expr, -1)
                ret = Mul(ret, a)
        return ret