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Yeah, there are bridges for converting Python data types to R and vice versa (Rpy2).

Feather is a recently released data frame file that both R and Python can interface with. We have Hadley Whickam and Wes McKinney to thank for it!

Feels like it should be called circumference, since multiplication is commutative :P (2pyr)

No, R and Python are separate kernels (think compiler). You can mix Shell and Python or Shell and R though.