openpyxl: my python xlsx library

Hello, this blog has moved to here :, the blog on WordPress will be kept not to break links, but will not be updated anymore, see you there !

Update: openpyxl 1.0 is now out !

At a customer, we read a lot of Excel files. We’ve tried the conventional approaches, that are xlrd and xlwt, pyinex, and COM automation.

That’s COM that we mainly use, because it’s able to deal with every Excel file format, from the ancient Excel 5 to most recent Excel 2007 Office Open XML format.
However, we experience from time to time stability issues (Excel is a complex beast, sometimes you don’t fully understand why it is angry).

We then looked for a native reader for .xlsx format, to get rid of the Excel part of the equation, but unfortunately, there are only two small read-only libraries for now:

Finally, I thought that I was the only guy who needed a native .xslx writer, and decided to stick with COM for now.
I wouldn’t be doing this project now without a tweet from Tarek Ziadé, who was also looking for such a library. That meant that we were at least two in need for the same thing, so I simply decided to write it.

Trust me, the Office Open XML format is open, but it’s also a bit twisted, so I spent a few days gathering documentation, and I finally landed on the PHPExcel library, that was already doing what I needed, but in PHP.

So now, I’m busy porting the PHPExcel library under Python, which is really easy, because of the similarities between both languages, but I can also benefit from all the nice things that come with Python, so the code is much simpler.

You can follow my progress on bitbucket: