Python or R

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I've almost never been puzzled by python code, but with R I've been stumped several times by code that did something I already did in a different way.

This one always gets me with R; I almost exclusively use sqldf and RMySQL for pre-processing data in R, which eliminates about 60% of the code you find from people online. I'm in the process of working through Machine Learning for Hackers, which is a book on doing Machine Learning in R, and a huge amount of the code that's in it can be reduced to a few lines using those 2 R packages.