'''
os模块
    目录操作
        .removedirs(dirname)
        .makedirs(dirname)
        .mkdir(dirname)
        .rmdir(dirname)
        .chdir(dirname)
        .listdir(dirname)
    属性
        .environ
        .name
        .sep
        .linesep
        .pathsep

    文件操作
        .remove(file_name)
    目录/文件操作
        .rename(oldname,newname)
        .stat()
    获取
        .getcwd()
        .getpid()
        .getppid()
        .cpu_count()
    命令
        .system()
        .popen().read()
    os.path
        对路径的操作
            .abspath()
            .split()
            .basename()
            .dirname()
            .splitext()
        判断
            .isdir()
            .isfile()
            .exists()
            .isabs()
        获取
            getctime
            getmtime
            getatime
            getsize
        合并路径
            .join(os.path.abspath(), path)

sys模块
    属性
        .version
        .platform
        .path
        .stdin
        .stdout
        .stderr
    方法
        sys.argv[]
        sys.exit()
time模块
    timestamp -->
                    format string
                ctime
                    struct_time
                localtime
                gmtime
    format string -->
                        struct_time
                striptime

    struct_time --> timestamp
               mktime
                    format string
                strftime
                asctime

    time.sleep
    time.time

    %Y %m %s %H %M %S
    tm_year mon mday hours minutes seconds yday isdst
datetime模块
    datetime(year, month, day, hours, minutes, seconds)
        .now()
        .today()
        .utcnow()
    date(year, month, day)
        .today()
    time(hours, minutes, seconds)

    日期对象
        .year() .month() .day() .weekday() .isoweekday()

    timedelta对象
    日期对象 + - 日期对象 = timedelta对象
    日期对象 + - timedelta对象 = 日期对象
random模块
    .random() 0-1
    .randint(a, b)
    .uniform(a, b)
    .randrange(start, stop, step)
    .choice([])
    .sample([], int)
    .shuffle(list)
math模块
    .fabs()
    .ceil()
    .floor()
    .pi
    .pow(a, b)
    sin()
    cos()
    tan()
json模块
    dumps(obj)
    loads(json)
    dump(obj, file)
    load(file)
pickle模块
    dumps(obj)
    loads(pickle)
    dump(obj, file)
    load(file)
collections模块
    namedtuple()
        a = namedtuple('a', '字段')
        b = a(元组)
        a.字段名
    deque()
        .append()
        .pop()
        .appendleft()
        .popleft()
    OrderedDict(**kwargs, [(k, v),...])
    defaultdict(func, **kwargs, [(k, v),...])
    Counter(iterable) {}
hashlib模块
    hashlib.md5/sha1/sha224/sha256/sha384/(byte)
    hexdigest()
configparser模块
    对 ini 文件的操作

    三板斧
        a = configparser.ConfigParser()
        a.read('.ini', encoding='')
        a.write(open())
    创建
        a['section'] = {'option': 'value',...}
    增加section
        .add_section('section')
    删除
        .remove_section('section')
        .remove_option('section', 'option')
    修改option-value
        .set('section', 'option', 'value')
    查看
        a['section']['option']
        .sections()
        .options('section')
        .get('section', 'option')
            getint
            getfloat
            getboolean
        .items('section')
    判断
        has_section('section')
        has_option('section', 'option')
struct模块
    pack('', data)
    unpack('', data)
CSV模块
    a = writer(open)
        .writerow([])
        .writerows([[]])
    .reader(open())
io模块
    from io import StringIO, BytesIO
    a = StringIO()
        a.write('zhangzhuowei')
        print(a.getvalue())
    b = BytesIO()
        b.write(b'zhangzhuowei')
        print(b.getvalue())
'''