Using threading.Lock as context manager

问题

In the documentation of the threading module it says:

All of the objects provided by this module that have acquire() and release() methods can be used as context managers for a with statement. The acquire() method will be called when the block is entered, and release() will be called when the block is exited.

I was wondering if it is called in blocking or non-blocking mode?

回答1:

From looking at the CPython source, it appears that it's called with default arguments, which means in blocking mode.

The methods you want to look at in particular are __enter__(), which is called at the beginning of the with block, and __exit__(), which is called at the end.

来源：https://stackoverflow.com/questions/13290429/using-threading-lock-as-context-manager