问题描述
我查看了 pickle 文档，但我没有了解泡菜在哪里有用.
I've looked at the pickle documentation, but I don't understand where pickle is useful.
泡菜有哪些常见用例?
推荐答案
我遇到的一些用法:
1)将程序的状态数据保存到磁盘上，以便它在重新启动时可以在中断的地方继续工作(持久性)
1) saving a program's state data to disk so that it can carry on where it left off when restarted (persistence)
2)在多核或分布式系统中通过TCP连接发送python数据(编组)
2) sending python data over a TCP connection in a multi-core or distributed system (marshalling)
3)将python对象存储在数据库中
3) storing python objects in a database
4)将任意python对象转换为字符串，以便可以将其用作字典键(例如，用于缓存和备忘录).
4) converting an arbitrary python object to a string so that it can be used as a dictionary key (e.g. for caching & memoization).
最后一个存在一些问题-两个相同的对象可以被腌制并导致不同的字符串-甚至相同的对象两次被腌制也可以具有不同的表示形式.这是因为泡菜可以包含参考计数信息.
There are some issues with the last one - two identical objects can be pickled and result in different strings - or even the same object pickled twice can have different representations. This is because the pickle can include reference count information.
为了强调@lunaryorn的评论-切勿从不可信的来源中提取字符串，因为精心制作的pickle可以在系统上执行任意代码.例如，请参见 https://blog.nelhage.com/2011/03/exploiting-pickle /
To emphasise @lunaryorn's comment - you should never unpickle a string from an untrusted source, since a carefully crafted pickle could execute arbitrary code on your system. For example see https://blog.nelhage.com/2011/03/exploiting-pickle/
这篇关于Python中泡菜的常见用例的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！