Openpyxl merge cells

Code

import openpyxl

wb = openpyxl.load_workbook('/Users/test0712.xlsx')
ws = wb['Sheet1']
max_rows = ws.max_row  #  Get the largest row 
max_columns = ws.max_column  #  Get the largest column 

# openpyxl Subscript from 1 Start 

ws.merge_cells(range_string='A1:B3')  #  merge cell A1:B3

wb.save('/Users/test0712.xlsx')

Before the merger

After the merger