flowlo/sympy.github.com — comment on commit c87522b9dbf4dc94b50529ac730bf3273308ba55
File: development.html line 43
By toolforger:

It's still valid to capitalize "Du". It was just made optional.
See http://www.duden.de/sprachratgeber/crashkurs--in-25-schritten-zur-neuen-rechtschreibung/6
I think we should stick with the old form then. It will irritate less people.
Or switch to the more formal "Sie" form; it might be better suited to the target audience of Sympy. I'm not sure about that though, so I'm leaving the decision to you.