Get Excel-Style Column Names from Column Number

Question

This is the code for providing the COLUMN name when the row and col ID is provided but when I give values like row = 1 and col = 104, it should return CZ, but it returns D@

row = 1 col = 104 div = col column_label = str() while div:     (div, mod) = divmod(div, 26)     column_label = chr(mod + 64) + column_label  print column_label 

What is wrong with what I am doing?

(This code is in reference for EXCEL Columns, where I provide the Row,Column ID value and expect the ALPHABETIC value for the same.)

Answer 1

Note The code now shown in this answer isn't what it was when you accepted it because I've found and fixed a bug it had that prevented it from properly handling column numbers greater than 702 (corresponding to Excel column 'ZZ').

It's quite likely you never used the previous version with large enough column numbers to have encountered the issue. FWIW, the Microsoft Excel specifications and limits say it supports worksheets with up to 1,048,576 rows by 16,384 columns (i.e. column 'XFD').

LETTERS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'  def excel_style(row, col):     """ Convert given row and column number to an Excel-style cell name. """     result = []     while col:         col, rem = divmod(col-1, 26)         result[:0] = LETTERS[rem]     return ''.join(result) + str(row)  if __name__ == '__main__':     addresses = [(1,  1), (1, 26),                  (1, 27), (1, 52),                  (1, 53), (1, 78),                  (1, 79), (1, 104),                  (1, 18253), (1, 18278),                  (1, 702),  # -> 'ZZ1'                  (1, 703),  # -> 'AAA1'                  (1, 16384), # -> 'XFD1'                  (1, 35277039)]      print('({:3}, {:>10}) --> {}'.format('row', 'col', 'Excel'))     print('==========================')     for row, col in addresses:         print('({:3}, {:10,}) --> {!r}'.format(row, col, excel_style(row, col))) 

Output:

(row,       col) --> Excel ======================== (  1,         1) --> 'A1' (  1,        26) --> 'Z1' (  1,        27) --> 'AA1' (  1,        52) --> 'AZ1' (  1,        53) --> 'BA1' (  1,        78) --> 'BZ1' (  1,        79) --> 'CA1' (  1,       104) --> 'CZ1' (  1,     18253) --> 'ZZA1' (  1,     18278) --> 'ZZZ1' (  1,       702) --> 'ZZ1' (  1,       703) --> 'AAA1' (  1,     16384) --> 'XFD1' (  1,  35277039) --> 'BYEBYE1'