What packages will stop supporting 2.7 Don't panic, ArcMap will still be using it... at least for 10.7
Numpy/Scipy drops support of python 2.7 Dec 31, 2018 get your code ready
Guido speaks 2020 is the big end The BDFL, Guido speaks at PyCon 2016 about python 2.7
Announcement Overview — Python 3.7.0a0 documentation yes... 3.7 is on its way
Announcement What’s New In Python 3.6 — Python 3.6.0b2 documentation final release candidate
iPad and iThings Python 3.5 comes to iThings don't get further behind...
Additional The key differences between python 2 and 3
Some frivolity ... but some resources
do check the resources section.
Do note, the python 3.5 comes to the iThings link, for those getting farther behind. Who needs a story map on your iPhone when you can have an interpolated 3D surface from matplotlib...
datetime is also an issue
Need help getting year from a date field (field calculator) for a disussion
and the esri arcpy fix until everyone is on python 3.x
What’s New In Python 3.7 — Python 3.8.0a3 documentation python 3.8 development.. ns timing and time
3.7.3 Documentation latest stable
What’s New In Python 3.7 — Python 3.7.3 documentation then you can scroll back in time