python - What is a callable? - Stack Overflow callable actually tells you if something is callable or not, while checking for __call__ tells you nothing; If an object o provides __getattribute__ or __getattr__, hasattr(o, '__call__') may return True, yet o will still not be callable because Python skips __getattribute__ and __getattr__ for calls The only real way left to check if
multithreading - The difference between the Runnable and Callable . . . Difference between Runnable and callable as below-- 1) The run() method of runnable returns void, means if you want your thread return something which you can use further then you have no choice with Runnable run() method There is a solution 'Callable', If you want to return any thing in form of object then you should use Callable instead of