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Datacamp walks you through the pros and cons of each.

Dataquest's comparison of the pros and cons of each.

Introduction to programming in Python for people with little or no previous programming experience.

This series of Code Academy tutorials focuses on basic Python programming concepts (strings, conditionals, functions, loops, etc.). The basic course is free.

This is "a free class for people with a little bit of programming experience who want to learn Python."

Basic page with useful links. Produced by the Python Software Foundation.

Very basic overview of how to get started, with links and sites.

Free R tutorial from Datacamp.

Overview of R by Datacamp.

Provides links to R tutorials, producing your first R program and getting help in R.

R news and tutorials contributed by hundreds of R bloggers.