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Started as an internal tool, at least according to medium & other blog posts.

It is in the works [0], and like people said since Google uses Python 2.7 that's the verison that was supported by default.

[0] https://stackoverflow.com/questions/46941308/python-3-suppor...

They can release a version that supports 2.7 much sooner

Jupyter switch really easily from Python2.7 to Python 3 to C# because the front end and backend are separated. Not sure why they are having issue here.