TL:DR, it is Python. And everyone already knows it.

daveguy · on Dec 23, 2016

And Python 2.7 to be specific. All the big framework releases are still 2.7 first. You have to wait for ML researchers to be bothered with 3.x.

jfpuget · on Dec 23, 2016

Not sure where you get this from. The most popular machine learning framework, scikit-learn, runs fine in 3.5. I am also using xgboost with Python 3.5 (yes, xgboost is a major open source for machine learning, just look at what framework is used by most Kaggle competition winners). TensorFlow, mxnet also support 3.5. I would have agreed with you a year ago, but there has been a major shift in use from 2.7 to 3.5 in 2016.

edited for typo.

eva1984 · on Dec 23, 2016

Not really...I actually find some Python 3.x only project recently, like this one:

https://github.com/openai/pixel-cnn