Brett Cannon wrote:
try: import threading except ImportError: threading = None # use non-threaded behaviour
But if it does it will be on platforms it couldn't run on previously.
Sigh. Let's try one more time:
Under 2.2 and earlier, on a platform that doesn't support threads, the above code will set threading to None, and the application can then use "if threading is None" to provide application-specific work- arounds.
(catching import errors is a very common pattern when you're writing portable Python code).
If you change Python so that "import threading" succeeds also on plat- forms that don't support threads, the application-specific workarounds will no longer be used, and the application may no longer work properly.
And since we're talking deadlocks, chances are that nobody will notice before it's too late.