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You can modify the background and text color of a table cell using python-docx by doing the following:

1. First, you need to import the necessary libraries:

   from docx import Document
   from docx.shared import RGBColor
   from docx.enum.table import WD_TABLE_ALIGNMENT
   from docx.enum.text import WD_COLOR_INDEX
   

2. Next, you need to open the document that you want to modify:

   document = Document(path_to_document)
   

3. To modify the background color of a table cell, you need to access the cell_format object and set the shading attribute to the desired color:

   cell = document.tables[table_index].cell(row_index, col_index)
   cell_format = cell._element.xpath('.//w:tcPr/w:shd')[0]._element
   cell_format.set('fill', '00ff00')  # set to green
   

4. Similarly, to modify the text color of a table cell, you need to access the paragraph_format object and set the font.color.rgb attribute to the desired color:

   cell_paragraph = cell.paragraphs[0]
   cell_paragraph_format = cell_paragraph.paragraph_format
   cell_paragraph_format.font.color.rgb = RGBColor(255, 0, 0)  # set to red
   

5. Finally, you need to save the document:

   document.save(path_to_document)
   

Note that the table_index, row_index, and col_index parameters are zero-based indices, i.e., the first table has index 0, the first row has index 0, and the first column has index 0.