vimdiff options by file type?

I would like to set different vimdiff options by filetype . . . in particular, I would like to ignore whitespace by default, but NOT ignore whitespace for python files.

I added the following to the rc file, but I still get "iwhite" set in diffopt for python files:

set diffopt+=iwhite
if &filetype == 'python'
set diffopt-=iwhite
endif

I'm probably missing something obvious :-))

Thanks!

Dan

--
--
You received this message from the "vim_use" maillist.
Do not top-post! Type your reply below the text you are replying to.
For more information, visit http://www.vim.org/maillist.php

---
You received this message because you are subscribed to the Google Groups "vim_use" group.
To unsubscribe from this group and stop receiving emails from it, send an email to vim_use+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.