It does look funny. But let's look at it from the other point of view. I wonder how easy it is for people used to right-to-left writing to read and write source code in "established" style, which is left-to-right and as far as I encountered mainly English (language keywords, identifiers). Could someone using right-to-left languages please comment on that ?
(To take it further: Imagine a world where all programming languages are written in Kanji or something )
Traditionally Chinese, Japanese and other Kanji-related languages are written vertically, top-to-down then right-to-left. Horizontal writings are were rarer but was also right-to-left (only used on horizontal stuffs like banners, but it was more like writing vertically but change to a new column every symbol because space ran out.). But after WW2 left-to-right while horizontal became dominant. Some Taiwanese newspaper still use right-to-left for their headlines, but I found them really hard to understand.
I think because nearly all dominant culture today use left-to-right systems, everyone is accustomed to this style so there should be no problem at all (people who use Arabic might correct me).
If these vertical cultures is dominant in a alternate universe, than instead of right-to-left, it would be top-down-right-left, which I think would be more efficient on today's wide screen monitors. No need to rotate your monitor any more, which could be good. Indenting vertically is almost done in the same way and there will always be only one truly correct indention style.
Welcome to the universe where the evil but more potent Chiang Kai-shek achieved world domination
By the way, there is Chinese Python.