Function venv

Lib/site.py:595–647

(known_paths)

def venv(known_paths):
    global PREFIXES, ENABLE_USER_SITE

    env = os.environ
    if sys.platform == 'darwin' and '__PYVENV_LAUNCHER__' in env:
        executable = sys._base_executable = os.environ['__PYVENV_LAUNCHER__']
    else:
        executable = sys.executable
    exe_dir = os.path.dirname(os.path.abspath(executable))
    site_prefix = os.path.dirname(exe_dir)
    sys._home = None
    conf_basename = 'pyvenv.cfg'
    candidate_conf = next(
        (
            conffile for conffile in (
                os.path.join(exe_dir, conf_basename),
                os.path.join(site_prefix, conf_basename)
            )
            if os.path.isfile(conffile)
        ),
        None
    )

    if candidate_conf:
        virtual_conf = candidate_conf
        system_site = "true"
        # Issue 25185: Use UTF-8, as that's what the venv module uses when
        # writing the file.
        with open(virtual_conf, encoding='utf-8') as f:
            for line in f:
                if '=' in line:
                    key, _, value = line.partition('=')
                    key = key.strip().lower()
                    value = value.strip()
                    if key == 'include-system-site-packages':
                        system_site = value.lower()
                    elif key == 'home':
                        sys._home = value

        if sys.prefix != site_prefix:
            _warn(f'Unexpected value in sys.prefix, expected {site_prefix}, got {sys.prefix}', RuntimeWarning)
        if sys.exec_prefix != site_prefix:
            _warn(f'Unexpected value in sys.exec_prefix, expected {site_prefix}, got {sys.exec_prefix}', RuntimeWarning)

        # Doing this here ensures venv takes precedence over user-site
        addsitepackages(known_paths, [sys.prefix])

        if system_site == "true":
            PREFIXES += [sys.base_prefix, sys.base_exec_prefix]
        else:
            ENABLE_USER_SITE = False

    return known_paths


def execsitecustomize():