Function _syscmd_ver

Lib/platform.py:281–332

Tries to figure out the OS version used and returns a tuple (system, release, version). It uses the "ver" shell command for this which is known to exists on Windows, DOS. XXX Others too ? In case this fails, the given parameters are used as defaults.

(system='', release='', version='',

               supported_platforms=('win32', 'win16', 'dos'))

# Windows versions.

def _syscmd_ver(system='', release='', version='',

               supported_platforms=('win32', 'win16', 'dos')):

    """ Tries to figure out the OS version used and returns
        a tuple (system, release, version).

        It uses the "ver" shell command for this which is known
        to exists on Windows, DOS. XXX Others too ?

        In case this fails, the given parameters are used as
        defaults.

    """
    if sys.platform not in supported_platforms:
        return system, release, version

    # Try some common cmd strings
    import subprocess
    for cmd in ('ver', 'command /c ver', 'cmd /c ver'):
        try:
            info = subprocess.check_output(cmd,
                                           stdin=subprocess.DEVNULL,
                                           stderr=subprocess.DEVNULL,
                                           text=True,
                                           encoding="locale",
                                           shell=True)
        except (OSError, subprocess.CalledProcessError):
            continue
        else:
            break
    else:
        return system, release, version

    ver_output = re.compile(r'(?:([\w ]+) ([\w.]+) '
                         r'.*'
                         r'\[.* ([\d.]+)\])')

    # Parse the output
    info = info.strip()
    m = ver_output.match(info)
    if m is not None:
        system, release, version = m.groups()
        # Strip trailing dots from version and release
        if release[-1] == '.':
            release = release[:-1]
        if version[-1] == '.':
            version = version[:-1]
        # Normalize the version and build strings (eliminating additional
        # zeros)
        version = _norm_version(version)
    return system, release, version


def _wmi_query(table, *keys):