uuid.py 文件源码

def _popen(command, args):
    import os
    path = os.environ.get("PATH", os.defpath).split(os.pathsep)
    path.extend(('/sbin', '/usr/sbin'))
    for dir in path:
        executable = os.path.join(dir, command)
        if (os.path.exists(executable) and
            os.access(executable, os.F_OK | os.X_OK) and
            not os.path.isdir(executable)):
            break
    else:
        return None
    # LC_ALL to ensure English output, 2>/dev/null to prevent output on
    # stderr (Note: we don't have an example where the words we search for
    # are actually localized, but in theory some system could do so.)
    cmd = 'LC_ALL=C %s %s 2>/dev/null' % (executable, args)
    return os.popen(cmd)