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Wordpress 学校网站,深圳市福田建设集团,wordpress地址改错了,网络营销个人总结在 Python 类中#xff0c;类变量是属于类本身的变量#xff0c;所有实例共享同一内存空间。修改类变量的方式主要有两种#xff1a;通过类名修改和通过实例修改#xff0c;但两者的效果截然不同#xff0c;需要重点区分。1. 通过类名修改类变量#xff08;推荐#xff…在 Python 类中类变量是属于类本身的变量所有实例共享同一内存空间。修改类变量的方式主要有两种通过类名修改和通过实例修改但两者的效果截然不同需要重点区分。1. 通过类名修改类变量推荐通过类名直接修改类变量会真正改变类变量的值所有实例访问该变量时都会获取到更新后的值。示例python运行class MyClass: class_var 初始值 # 类变量 # 通过类名修改类变量 MyClass.class_var 修改后的值 # 所有实例访问的都是修改后的值 obj1 MyClass() obj2 MyClass() print(obj1.class_var) # 输出修改后的值 print(obj2.class_var) # 输出修改后的值 print(MyClass.class_var) # 输出修改后的值2. 通过实例修改类变量不推荐易混淆通过实例修改类变量时不会改变类本身的变量而是会给该实例创建一个同名的实例变量此后该实例访问该变量时会优先使用自己的实例变量屏蔽类变量而其他实例和类本身访问的仍然是原来的类变量。示例python运行class MyClass: class_var 初始值 # 类变量 obj1 MyClass() obj2 MyClass() # 通过实例 obj1 修改 类变量实际是创建实例变量 obj1.class_var obj1的实例变量 # 实例 obj1 访问的是自己的实例变量 print(obj1.class_var) # 输出obj1的实例变量 # 实例 obj2 和类本身访问的仍是原来的类变量 print(obj2.class_var) # 输出初始值 print(MyClass.class_var) # 输出初始值总结通过类名修改会全局更新类变量影响所有实例。通过实例修改不会改变类变量只会给该实例新增一个同名实例变量仅影响当前实例。实际开发中建议始终通过类名修改类变量避免通过实例修改导致的逻辑混淆。https://avg.163.com/topic/detail/8126074https://avg.163.com/topic/detail/8126272https://avg.163.com/topic/detail/8126470https://avg.163.com/topic/detail/8125935https://avg.163.com/topic/detail/8126065https://avg.163.com/topic/detail/8126263https://avg.163.com/topic/detail/8126400https://avg.163.com/topic/detail/8126466https://avg.163.com/topic/detail/8125933https://avg.163.com/topic/detail/8126049https://avg.163.com/topic/detail/8126269https://avg.163.com/topic/detail/8126404https://avg.163.com/topic/detail/8126469https://avg.163.com/topic/detail/8125931https://avg.163.com/topic/detail/8126061https://avg.163.com/topic/detail/8126265https://avg.163.com/topic/detail/8126401https://avg.163.com/topic/detail/8126465https://avg.163.com/topic/detail/8125932https://avg.163.com/topic/detail/8126397https://avg.163.com/topic/detail/8126462https://avg.163.com/topic/detail/8126054https://avg.163.com/topic/detail/8126398https://avg.163.com/topic/detail/8126464https://avg.163.com/topic/detail/8126052https://avg.163.com/topic/detail/8126258https://avg.163.com/topic/detail/8126396https://avg.163.com/topic/detail/8126461https://avg.163.com/topic/detail/8125930https://avg.163.com/topic/detail/8126045https://avg.163.com/topic/detail/8126267https://avg.163.com/topic/detail/8126402https://avg.163.com/topic/detail/8126467https://avg.163.com/topic/detail/8126261https://avg.163.com/topic/detail/8126399https://avg.163.com/topic/detail/8126468https://avg.163.com/topic/detail/8125934https://avg.163.com/topic/detail/8126050https://avg.163.com/topic/detail/8126268https://avg.163.com/topic/detail/8126463