How do I tell a Python script to use a particular version
Perhaps not exactly what you asked, but I find this to be useful to put at the start of my programs:
import sys
if sys.version_info[0] < 3:
raise Exception("Python 3 or a more recent version is required.")
You can add a shebang line the to the top of the script:
#!/usr/bin/env python2.7
But that will only work when executing as ./my_program.py
.
If you execute as python my_program.py
, then the whatever Python version that which python
returns will be used.
In re: to virtualenv use: virtualenv -p /usr/bin/python3.2
or whatever to set it up to use that Python executable.