类变量和实例变量的命名规范有哪些具体的例子?

你想获取类变量和实例变量命名规范的具体可落地示例,核心遵循 Python PEP 8 规范,两类变量因用途和归属不同,命名风格有明确区分,下面通过「场景分类 + 正面示例 + 反面示例 + 完整代码」的形式详细呈现:

一、通用命名基础(所有变量必遵守,先明确前提)

  1. 风格:小写字母 + 下划线分隔(蛇形命名 snake_case),禁止驼峰命名(如 userName);
  2. 语义:见名知意,避免无意义缩写(如 uid 可接受,x1 不推荐);
  3. 禁用:关键字(class/def)、魔法属性格式(__xxx__)、数字开头、特殊字符(-/@)。

二、类变量命名规范 + 具体示例

类变量是类的共享属性,命名需突出「全局、共享、常量、统计」特性,分 3 类场景:

表格

类变量类型 命名规则 正面示例(推荐) 反面示例(避坑)
普通共享类变量 蛇形命名,体现 "共享 / 统计" 语义 total_users(总用户数)default_timeout(默认超时时间)class_name(班级名称)pass_rate(考试通过率)system_version(系统版本) totalUsers(驼峰命名,不符合 PEP8)tu(无意义缩写,可读性差)123count(数字开头,语法错误)class(关键字,禁用)TotalCount(大驼峰,混淆类名风格)
常量类变量 全大写 + 下划线分隔,体现 "不可修改" MAX_RETRY = 3(最大重试次数)DEFAULT_PORT = 8080(默认端口)SPECIES = "人类"(物种常量)MAX_SCORE = 100(满分分值)ALLOWED_METHODS = ["GET", "POST"](允许的请求方法) maxRetry = 3(驼峰 + 小写,无常量标识)max_score = 3(全小写,无法区分普通变量)MaxScore = 3(混合大小写,不规范)max-score = 3(含连字符,语法错误)
私有类变量 单下划线开头 + 蛇形命名(约定私有,外部不建议访问) _internal_cache(内部缓存)_temp_data(临时存储数据)_grade_mapping(年级映射字典)_debug_mode(调试模式标识) __internal_cache(双下划线,触发名称改写,非必要禁用)_InternalCache(首字母大写,不符合蛇形)_internalCache(驼峰,不规范)internal_cache(无下划线,无法标识私有)
完整代码示例(类变量命名)

python

运行

复制代码
class OrderSystem:
    # 1. 常量类变量(全大写)
    MAX_ORDER_ITEMS = 20  # 订单最大商品数量
    DEFAULT_EXPIRE_HOURS = 24  # 订单默认过期小时数
    PAYMENT_TYPES = ["alipay", "wechat_pay"]  # 支持的支付方式
    MIN_ORDER_AMOUNT = 0.01  # 最小订单金额

    # 2. 普通共享类变量(蛇形命名)
    total_orders = 0  # 系统总订单数
    pending_orders = 0  # 待支付订单数
    completed_orders = 0  # 已完成订单数
    platform_name = "电商小铺"  # 平台名称

    # 3. 私有类变量(单下划线开头)
    _order_status_mapping = {0: "待支付", 1: "已支付", 2: "已取消"}  # 订单状态映射表
    _temp_order_cache = {}  # 临时订单缓存
    _is_maintenance = False  # 系统是否在维护中

    def create_order(self):
        # 修改普通共享类变量
        OrderSystem.total_orders += 1
        OrderSystem.pending_orders += 1

三、实例变量命名规范 + 具体示例

实例变量是单个实例的独有属性,命名需突出「个体特征、实例状态」,分 3 类场景:

表格

实例变量类型 命名规则 正面示例(推荐) 反面示例(避坑)
普通实例变量 蛇形命名,体现 "实例独有" 语义 user_id = 10001(用户唯一 ID)order_id = "ORD20251226"(订单编号)phone_number = "13800138000"(手机号)shipping_address = "北京市朝阳区"(收货地址)register_time = "2025-01-01"(注册时间)is_active = True(是否激活) userID = 10001(驼峰命名,不符合 PEP8)uid = 10001(无意义缩写,可读性差)PhoneNumber = "138..."(大驼峰,混淆类名)1phone(数字开头,语法错误)user-id(含连字符,语法错误)
私有实例变量 单下划线开头 + 蛇形命名(约定私有,外部不建议访问) _password = "e10adc3949ba59abbe56e057f20f883e"(密码哈希)_login_token = "token_123456"(登录令牌)_internal_state = "init"(实例内部状态)_email_verified = False(邮箱是否验证) __password(双下划线,慎用,触发名称改写)_Password(首字母大写,不规范)_loginToken(驼峰,不符合蛇形)password(无下划线,无法标识私有)
强私有实例变量 双下划线开头 + 蛇形命名(慎用,防止子类覆盖) __secret_key = "abc_xyz_123"(加密密钥)__transaction_id = "trans_20251226"(交易流水号)__core_config = {}(核心配置,禁止子类修改) ___secret_key(多下划线,冗余混乱)__SecretKey(混合大小写,不规范)__secret-key(含连字符,语法错误)__secretkey(无下划线,可读性差)
完整代码示例(实例变量命名)

python

运行

复制代码
class User:
    # 类变量(常量)
    MIN_REGISTER_AGE = 18  # 最小注册年龄

    def __init__(self, user_id, username, phone):
        # 1. 普通实例变量(蛇形命名,实例独有)
        self.user_id = user_id  # 用户唯一标识
        self.username = username  # 用户名
        self.phone_number = phone  # 联系电话
        self.age = None  # 年龄
        self.register_time = None  # 注册时间
        self.is_active = True  # 账号是否激活
        self.user_avatar = None  # 用户头像地址
        self.receive_addresses = []  # 收货地址列表

        # 2. 私有实例变量(单下划线开头,类内操作)
        self._email = None  # 邮箱(外部不建议直接访问)
        self._login_count = 0  # 登录次数(内部统计)
        self._email_verified = False  # 邮箱验证状态(内部标识)
        self._last_login_time = None  # 最后登录时间

        # 3. 强私有实例变量(双下划线开头,防止子类覆盖)
        self.__password_hash = None  # 密码哈希值(核心隐私数据)
        self.__secret_token = None  # 用户专属秘钥(禁止子类修改)

    def set_email(self, email):
        # 类内操作私有实例变量
        self._email = email

    def update_password(self, new_password_hash):
        # 类内操作强私有实例变量
        self.__password_hash = new_password_hash

    def add_login_count(self):
        self._login_count += 1

四、避坑补充:易出错的命名场景示例

  1. 禁止类变量与实例变量同名:会导致实例访问时优先读取实例变量,逻辑混乱

    python

    运行

    复制代码
    # 错误示例
    class BadExample:
        name = "默认名称"  # 类变量
        def __init__(self, name):
            self.name = name  # 实例变量与类变量同名,易混淆
    
    # 正确示例
    class GoodExample:
        default_name = "默认名称"  # 类变量(改名避免冲突)
        def __init__(self, name):
            self.name = name  # 实例变量
  2. 可变类型类变量命名:仍遵循类变量规则,语义体现 "集合 / 映射" 特性

    python

    运行

    复制代码
    class Cart:
        DEFAULT_ITEMS = ["环保购物袋"]  # 常量类变量(全大写)
        _hot_recommend_items = ["纸巾", "矿泉水"]  # 私有类变量(单下划线)
        total_cart_count = 0  # 普通类变量(蛇形命名)

总结

表格

变量类型 核心命名规则 经典示例汇总
类变量 普通:蛇形;常量:全大写;私有:单下划线 total_usersMAX_RETRY_internal_cache
实例变量 普通:蛇形;私有:单下划线;强私有:双下划线 phone_number_password__secret_key

这些示例均符合 PEP 8 规范,既能清晰区分变量归属(类 / 实例),又能通过名称直观理解用途,可直接在实际项目中复用。

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