copy
| 类或方法 | 解释 | 特殊说明 |
|---|---|---|
| copy.copy() | 浅拷贝 | |
| copy.deepcopy() | 深拷贝 | |
| exception copy.eror |
浅拷贝与深拷贝的区别:
浅拷贝只拷贝最外层的对象，而深拷贝会递归的拷贝所有对象。
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weakref
weakref允许创建对象的弱引用。
python使用自动垃圾回收机制，当一个对象的引用计数为0或只有弱引用时，执行垃圾回收。所以弱引用不影响对象的回收。
| 类或方法 | 解释 | 特殊说明 |
|---|---|---|
| class weakref.ref(object[, callback]) | ||
| weakref.proxy(object[, callback]) | ||
| weakref.getweakrefcount(object) | ||
| weakref.getweakrefs(object) | ||
| class weakref.WeakKeyDictionary([dict]) | ||
| WeakKeyDictionary.keyrefs() | ||
| class weakref.WeakValueDictionary([dict]) | ||
| WeakValueDictionary.valuerefs() | ||
| class weakref.WeakSet([elements]) | ||
| class weakref.WeakMethod(method) | ||
| class weakref.finalize(obj, func, *args, **kwargs) | ||
| weakref.ReferenceType | ||
| weakref.ProxyType | ||
| weakref.CallableProxyType | ||
| weakref.ProxyTypes | ||
| exception weakref.ReferenceError |