def col_swap(self, i, j):
        """Swap, in place, columns i and j.

        Examples
        ========

        >>> from sympy.matrices import SparseMatrix
        >>> S = SparseMatrix.eye(3); S[2, 1] = 2
        >>> S.col_swap(1, 0); S
        Matrix([
        [0, 1, 0],
        [1, 0, 0],
        [2, 0, 1]])
        """
        if j > i:
            i, j = j, i
        rows = self.col_list()
        temp = []
        for ii, jj, v in rows:
            if jj == i:
                self._smat.pop((ii, jj))
                temp.append((ii, v))
            elif jj == j:
                self._smat.pop((ii, jj))
                self._smat[ii, i] = v
            elif jj > j:
                break
        for k, v in temp:
            self._smat[k, j] = v
dataset/ETHPy150Open sympy/sympy/sympy/matrices/sparse.py/MutableSparseMatrix.col_swap/swapped operands of `>`