The best replacement for python 3 is ruby 2.

The best alternatives to python 3 are rated as following:
★★★★★  ruby 2
★  python 2

Your alternative for python 3 is not listed? Suggest!
Speaking about python 3, one probably shouldn't forget about django.

Other search terms related to python 3 and their ratings are:
★★★★★ django
★ pip
You have in mind a companion for python 3 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of python 3 in all years. Click on graph for more.
python 3
ruby 2
python 2