tensorproduct.py 文件源码

def _sympystr(self, printer, *args):
        from sympy.printing.str import sstr
        length = len(self.args)
        s = ''
        for i in range(length):
            if isinstance(self.args[i], (Add, Pow, Mul)):
                s = s + '('
            s = s + sstr(self.args[i])
            if isinstance(self.args[i], (Add, Pow, Mul)):
                s = s + ')'
            if i != length - 1:
                s = s + 'x'
        return s