Running subprocess within different virtualenv with python

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The accepted answer does not address the problem of ‘activating’ a virtualenv in a subprocess.

If you start your application with a call to the python executable, like in your example it is actually very simple: you only have to explicitly point to the executable in the virtualenv.

import subprocess

subprocess.Popen(["virtualenv1/bin/python", "my_script.py"])
subprocess.Popen(["virtualenv2/bin/python", "my_other_script.py"])

will start the processes in the respective virtualenvs.

Important

To address the concerns voiced in the comments:

If you want to run a subprocess and be sure to use the same interpreter that the current process is running in you have to use sys.executable. Also available: sys.exec_prefix to access the site-specific directory prefix where the platform-dependent Python files are installed.

If you want a much more in depth discussion of this topic, have a look at this pull request.

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