Learn Ruby Or Python?

I've been reading a lot of short computer-programming articles online lately, such as Exception-Handling Antipatterns, which I bookmarked a couple weeks ago (as a possible reference for a talk about Defensive Programming that I gave two weeks ago), but didn't end up reading it until today.

I also learn about Duck Typing (via Joel on Software's Ruby Performance Revisited). The articles The Perils of Duck Typing and Java does Duck Typing were interesting follow-ups.

I think I need to get around to learning Ruby. I've been meaning to for a while, but have never gotten any farther than bookmarking Prgramming Ruby and Why's Poignant Guide To Ruby. Do you think I should teach myself Ruby or try learning Python first?