Activate venv from within Python3 Script

We want to deliver a ready-to-deploy venv for different versions of our software.

Therefore, I wanted to write a simple Python script, which calls a couple of bash commands for installing every package we need.

So the steps are:

  1. Create a venv with a Name suffixed with version number
  2. Activate this venv
  3. Install packages from PyPy
  4. cd into a couple of local packages folders
  5. Install them by git install .
  6. cp a couple of files in the venv folder

My problem now is, I can't find a way to activate the venv from within the script. I already read about how it was done in Python 2 (with execfile) and about the exec(open(path_to_env_activate).read()) in Python 3.

However, the second version for Python3 gives me a Syntax Error:

Traceback (most recent call last):
  File "", line 32, in <module>
  File "<string>", line 1
    @echo off
SyntaxError: invalid syntax

What did I get wrong here? Or is there kinda best practice how to install venv with packages with a script?

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