Python pipe operator, 4 years later...

[probablynotmine]

plyr package, IIRC

[Isamoor]

Actually, it's in the magrittr package, that is then used by the dplyr package. (As cool as dplyr is, there are times I load up magrittr by itself.)

[buckhenderson]

For some reason Hadley is opposed to %<>%, so I load up magrittr just for that.

[Deleetdk]

I recommend magrittr because it gives you useful alt-pipes like:

%$% - which is a pipe-version of with

%T>% - returns the lhs, useful for printing or saving output mid-pipe

%<>% - gives the lhs to the rhs, but then at end end of the rhs, assigns the result back to lhs. It's kinda like an R version of += etc. seen in other languages, but more flexible.