How to Activate a Virtualenv from Python Scripts without Subprocesses?

Activating a Virtualenv from Python Scripts

To activate a virtualenv instance from a Python script without using subprocesses, you can utilize the following techniques:

Activating for Subprocesses

If you intend to execute a Python script within the virtualenv using a subprocess, invoke the script using the Python interpreter from the virtualenv's 'bin/' directory:

import subprocess

python_bin = "/path/to/virtualenv/bin/python"
script_file = "must/run/under/virtualenv/script.py"

subprocess.Popen([python_bin, script_file])

Activating for Current Interpreter

To activate the virtualenv within the current Python interpreter, employ the exec function along with the activate_this.py script:

activate_this_file = "/path/to/virtualenv/bin/activate_this.py"

exec(open(activate_this_file).read(), {'__file__': activate_this_file})

For this approach, ensure you use the virtualenv library, not venv. If using venv, copy the implementation of virtualenv's activate_this.py script with minor modifications to make it work with venv.

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