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Of course, these days Pandas is _the_ Python library for statistics. There is also scikit-learn.

I haven't used R nor Pandas. How does the two compare? Why do people use R and not Python?

> Why do people use R and not Python?

R style DataFrames was raison d'etre of Pandas in the first place. (http://pandas.pydata.org/#why-not-r)

People started using R about the same time they started using Python (that is, the first half of the 1990s).

Since then, R has gained a huge number of statistics packages. Python has fewer of them.