Interprocess Communication

What is the primary purpose of the subprocess.PIPE constant?

Which module allows you to run external programs and interact with their input/output streams?

You are using a multiprocessing.Semaphore(3). What happens when the 4th process attempts to acquire the semaphore?

You are writing a Python script that needs to perform heavy I/O-bound tasks concurrently. Which module should you prioritize to minimize the overhead of global interpreter lock (GIL) contention?

If you want to run a function in a background thread, which class should you instantiate?

Which object would you use to share a simple integer between processes that is safe for concurrent access?

Which TWO of the following scenarios are best suited for the subprocess module?

When using a multiprocessing.Queue to share data between processes, what happens if the queue is full and you use the put() method without a timeout?

You have a thread waiting on a threading.Event. Which method should another thread call to wake up the waiting thread?

When using the multiprocessing module, why is it recommended to use a Manager object instead of a standard dictionary to share data between processes?

Which of the following is true regarding daemon threads in Python?

Which TWO of the following are key benefits of using the multiprocessing.Pool class?

Which THREE of the following represent types of IPC provided by the multiprocessing module?

Which THREE of the following represent ways to synchronize access to shared data in a multi-threaded application?

You are using the subprocess.run() function to execute an external command. Which argument ensures that the command's stdout is captured as a string rather than printed to the console?

When using subprocess.Popen, why is it dangerous to use shell=True with user-supplied input?

When spawning processes on Windows, what is the default start method used by the multiprocessing module?

Two threads are modifying a shared global integer. You want to ensure that only one thread modifies the integer at a time. Which synchronization primitive is most appropriate?

Which THREE of the following are true about the 'subprocess' module's interaction with the operating system?

Which TWO of the following are potential issues when using the 'fork' start method in multiprocessing?

Which of the following describes the difference between Process.terminate() and Process.kill()?

Which THREE of the following features are common to both the threading and multiprocessing modules?

You are using Pool.apply_async(). How do you retrieve the result of the function call?

Why should you use a 'with' statement when using a Lock?

You are managing subprocesses using subprocess.Popen. Which attribute of the Popen object should you check to verify the exit code after the process terminates?

Which THREE of the following are valid ways to instantiate a process in the multiprocessing module?

You are using the multiprocessing.Process class and notice that child processes are not terminating cleanly. Which method should you call to ensure the main process waits for the child process to complete?

What is the result of using a Pipe to communicate between two processes if both processes attempt to write to the same end simultaneously?

What is the primary reason to use the multiprocessing module instead of the threading module for CPU-bound tasks in Python?

Which TWO of the following are valid ways to synchronize threads?

Which TWO of the following are true about the multiprocessing.Queue object?

You are using a multiprocessing.Pool. Which method should you use to apply a function to a sequence of items and get the results back in order as they complete?

In the context of the threading module, what does the daemon flag do when set to True?