subprocess call

os-module.txt

tokibito@ubuntu:~$ cat main.py
import os
import subprocess
subprocess.call([os.environ['_'], "-V"])
tokibito@ubuntu:~$ python main.py
Python 2.7.6
tokibito@ubuntu:~$ tmp/venv/bin/python main.py
Python 3.4.3

sys-module.txt

tokibito@ubuntu:~$ cat main.py
import sys
import subprocess
subprocess.call([sys.executable, "-V"])
tokibito@ubuntu:~$ python main.py
Python 2.7.6
tokibito@ubuntu:~$ tmp/venv/bin/python main.py
Python 3.4.3

だめ.txt

tokibito@ubuntu:~$ python -V
Python 2.7.6
(venv) tokibito@ubuntu:~$ python -V
Python 3.4.3
(venv) tokibito@ubuntu:~$ python
Python 3.4.3 (default, Oct 14 2015, 20:28:29)
[GCC 4.8.4] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import subprocess
>>> subprocess.call(["python", "-V"])
Python 3.4.3
0