ValueError while acess cell._tc.bottom

[mepwang]

OS: updated ubuntu 24.04
Python: 3.12.8
Python-Docx: 1.1.2

test.docx

while parsing table in docx, ValueError exception occurred:
ValueError: no tc element at grid_offset=3

in line: bottom = cell._tc.bottom

code:

    for row_idx, row in enumerate(table.rows):
        for cell_idx, cell in enumerate(row.cells):
            top = cell._tc.top
            bottom = cell._tc.bottom
            left = cell._tc.left
            right = cell._tc.right

docx file: see test.docx in attachment

[mepwang]

it's a bug in oxml/table.py, line 79, function tc_at_grid_offset(self, grid_offset: int) -> CT_Tc

[alterlv]

I also encountered this error

[mepwang]

I also encountered this error

fix tc_at_grid_offset implementation in file src/docx/oxml/table.py:

    def tc_at_grid_offset(self, grid_offset: int) -> CT_Tc:
        """The `tc` element in this tr at exact `grid offset`.

        Raises ValueError when this `w:tr` contains no `w:tc` with exact starting `grid_offset`.
        """
        # -- account for omitted cells at the start of the row --
        
        if grid_offset < self.grid_before:
            raise ValueError(f"no `tc` element at grid_offset={grid_offset}")
        
        cell_dict = dict()
        cell_index = 0
        for tc in self.tc_lst:
            for _ in range(tc.grid_span):
                cell_dict[cell_index] = tc
                cell_index += 1
                
        if grid_offset not in cell_dict:
            raise ValueError(f"no `tc` element at grid_offset={grid_offset}")
        
        return cell_dict[grid_offset]
    
        # remaining_offset = grid_offset - self.grid_before

        # for tc in self.tc_lst:
        #     # -- We've gone past grid_offset without finding a tc, no sense searching further. --
        #     if remaining_offset < 0:
        #         break
        #     # -- We've arrived at grid_offset, this is the `w:tc` we're looking for. --
        #     if remaining_offset == 0:
        #         return tc
        #     # -- We're not there yet, skip forward the number of layout-grid cells this cell
        #     # -- occupies.
        #     remaining_offset -= tc.grid_span

        # raise ValueError(f"no `tc` element at grid_offset={grid_offset}")