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No there isn't. People used to be able to extrapolate it from the pypi downloads stats (like this: https://alexgaynor.net/2014/jan/03/pypi-download-statistics/), but sadly it's not possible anymore.

There is https://caremad.io/2015/04/a-year-of-pypi-downloads/ which is also based on PyPI downloads and is more recent.

Oh, thanks! It's kind of crazy to see Python 3.x usage stuck around 7%, though.

Note: that's from a year ago.