haidereli
New Contributor II

As shared above I tested it and worked fine for loading and updating and saving

 

import openpyxl

wb = openpyxl.load_workbook('Test.xlsx')
ws = wb.active
for row in ws.iter_rows():
print([col.value for col in row]) #show all data

ws['A1']='Data'
wb.save('Test.xlsx')