printer_text.py 文件源码

def _print_Mul(self, expr):
        """Print a Mul object.

        :param expr: The expression.
        :rtype : str
        :return: The printed string.
        """

        assert isinstance(expr, _sympy.Mul)

        #  Get the precedence.
        prec = _sympy_precedence.precedence(expr)

        #  Get commutative factors and non-commutative factors.
        c, nc = expr.args_cnc()

        #  Print.
        res = super(_MEXPPrinter, self)._print_Mul(expr.func(*c))
        if nc:
            res += '*'
            res += '^'.join(self.parenthesize(a, prec) for a in nc)

        return res