导入时生成新线程 [英] Spawning a new thread while importing

问题描述

Python的 threading 文档状态：

Python's threading documentation states:

除了在主模块中，导入不应该有$ b边$ b产生一个新线程的效果，然后以
的任何方式等待该线程。如果生成的线程直接或间接尝试导入
模块，则不遵守此限制可能导致死锁
。

Other than in the main module, an import should not have the side effect of spawning a new thread and then waiting for that thread in any way. Failing to abide by this restriction can lead to a deadlock if the spawned thread directly or indirectly attempts to import a module.

我正在寻找演示此限制的示例代码。

I'm looking for example code that demonstrates this restriction.

推荐答案

我试过这个，一个产生的模块一个线程，其目标试图从线程导入线程导入 sys ：

I tried this, a module that spawns a thread whose target tries to import sys:

from threading import Thread

def my_target():
    import sys

thread = Thread(target=my_target)
thread.start()
thread.join()

当启动python解释器并尝试导入上面的模块时，它确实冻结了。

When the python interpreter is launched and an attempt to import the module above is made, it indeed freezes.

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