__init__.py 文件源码

def __getitem__(self, indices):
        i, j = indices
        if i < 0 or i >= self.numRows:
            raise IndexError("Row index %d is out of range [0, %d)"
                             % (i, self.numRows))
        if j < 0 or j >= self.numCols:
            raise IndexError("Column index %d is out of range [0, %d)"
                             % (j, self.numCols))

        # If a CSR matrix is given, then the row index should be searched
        # for in ColPtrs, and the column index should be searched for in the
        # corresponding slice obtained from rowIndices.
        if self.isTransposed:
            j, i = i, j

        colStart = self.colPtrs[j]
        colEnd = self.colPtrs[j + 1]
        nz = self.rowIndices[colStart: colEnd]
        ind = np.searchsorted(nz, i) + colStart
        if ind < colEnd and self.rowIndices[ind] == i:
            return self.values[ind]
        else:
            return 0.0