what openpyxl version do you use? Anyone else able to confirm OP problem?
I also use excel 2016 in my office
I also use excel 2016 in my office
If you can't explain it to a six year old, you don't understand it yourself, Albert Einstein
How to Ask Questions The Smart Way: link and another link
Create MCV example
Debug small programs
How to Ask Questions The Smart Way: link and another link
Create MCV example
Debug small programs