Python dual install

Question

How do I set permanent paths for both Python 2 and 3 in command prompt such that I can invoke either every time I open the command window ie 'python2' for python 2 interpreter or 'python3' for python 3 interpreter

For windows 7: http://stackoverflow.com/questions/3809314/how-to-install-both-python-2-x-and-python-3-x-in-windows-7 — jgritty, Oct 21 '14 at 21:26
For ubuntu: http://askubuntu.com/questions/196071/need-to-have-2-versions-of-python just apt-get both versions — jgritty, Oct 21 '14 at 21:27

score 2 · Answer 1 · answered Oct 22 '14 at 10:12

Just use python launcher: py -2 runs Python 2 and py -3 runs Python 3.

If you add #! python3 (shebang) at the top of your script then py your_script.py will use Python 3, if you add #! python2 then it will use Python 2 automatically.

You can also configure it to run all *.py files by default.

score 0 · Answer 2 · answered Oct 22 '14 at 07:59

0

Create a python2.bat and a python3.bat file somewhere on your path (could in your main python folder). That file only contains the location of the relavant python.exe, e.g.

C:\Programs\Python26\python.exe %*

answered Oct 22 '14 at 07:59

Gerard

124
1
4

Python dual install

2 Answers2