Which version of python is commonly used???

Answer 1

2.7
3.6

Answer 2

support for 2.7 will end 01.01.2020.
https://pythonclock.org

Answer 3

Just a side comment, IBM SPSS (commonly used in corporate world for data analysis), has an embedded version of Python installed, allowing using Python scripts -- it is Python 2.5, though :(

(yes, 2.5, not 2.7. The 2009 compilation. Call that a *legacy* ;)

Answer 4

Sage in its Math pack has also one 2.7 embedded.

Answer 5

another side comment. You can code in R and Python in R Studio. That’s a good news for data scientists. ;)