Trying to call pip from a python script to install a package in a virtual env.

    opt = '--dry-run,' if dry_run else ''
    args = f'{project.venv_path}/bin/python3 -m pip install {opt} --report - django'
        completedProcess = subprocess.run(shlex.split(args),
                                          encoding='utf-8',
                                          capture_output=True,
                                          check=True)
        project.django_requirements = completedProcess.stdout
        return completedProcess.returncode
    except subprocess.CalledProcessError as e:
        print('subprocess error for pip install django')
        print(e.stdout)
        print(e.stderr)
        return e.returncode
I keep getting the following error message : no such option --dry-run

or no such option --report depending of the order of the option in args !..
What did I miss?