Python & 中的线程错误PyQt [英] Thread error in Python & PyQt

问题描述

我注意到当函数 setModel 在并行线程中执行时(我试过 threading.Timer 或 threading.thread)，我明白了:

I noticed that when the function setModel is executed in parallel thread (I tried threading.Timer or threading.thread), I get this:

QObject: Cannot create children for a parent that is in a different thread.
(Parent is QHeaderView(0x1c93ed0), parent's thread is QThread(0xb179c0), current thread is QThread(0x23dce38)
QObject::startTimer: timers cannot be started from another thread
QObject: Cannot create children for a parent that is in a different thread.
(Parent is QTreeView(0xc65060), parent's thread is QThread(0xb179c0), current thread is QThread(0x23dce38)
QObject::startTimer: timers cannot be started from another thread

有什么办法可以解决这个问题吗?

Is there any way to solve this?

推荐答案

Qt(和其他丰富的框架)的多线程使用确实是生活中的一个事实，这是一项微妙而困难的工作，需要明确的关注和照顾——请参阅Qt 的文档 对该主题的出色报道(适用于在线程方面有经验的读者)一般，为那些还没有读过的人推荐阅读).

It is indeed a fact of life that multithreaded use of Qt (and other rich frameworks) is a delicate and difficult job, requiring explicit attention and care -- see Qt's docs for an excellent coverage of the subject (for readers experienced in threading in general, with suggested readings for those who yet aren't).

如果可能的话，我会建议我一直建议的 Python 中最合理的线程架构:让每个子系统都由一个专用线程拥有和使用；通过 Queue.Queue 的实例在线程之间进行通信，即通过消息传递.这种方法可能有点限制，但它为专门识别和精心设计的异常(基于线程池、偶尔产生的新线程、锁、条件变量和其他此类挑剔的东西；-)提供了良好的基础.在后一类中，我还将通过 排队连接.

If you possibly can, I would suggest what I always suggest as the soundest architecture for threading in Python: let each subsystem be owned and used by a single dedicated thread; communicate among threads via instances of Queue.Queue, i.e., by message passing. This approach can be a bit restrictive, but it provides a good foundation on which specifically identified and carefully architected exceptions (based on thread pools, occasional new threads being spawned, locks, condition variables, and other such finicky things;-). In the latter category I would also classify Qt-specific things such as cross-thread signal/slot communication via queued connections.

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