Example code iteratively building a 'mappings' dictionary from a table in Excel using openpyxl. On seeing two blank lines, we assume the table has ended.

search_mappings.py

empty = 0  # initialize our empty cell count

while empty < 2:
    # increment the row number (which begins at the row we found 'Internal'
    row += 1
    # assign the value we find in the 'Internal' column to internal
    internal = ws[f'B{row}'].value
    
    if internal is None:
        empty += 1  # if we get blank row, increment empty counter
        
    else:
        # otherwise we have a mapping to add to the mappings dict
        mappings[internal] = ws[f'D{row}'].value
        empty = 0  # also re-initialize the empty counter