POC Concurrency & Multithreading 3

Question 1

What does setting thread.daemon = True do before starting a thread?

Accepted Answer

Makes the thread run in the background and automatically exit when the main program ends

Answer

Daemon threads are background threads that do not prevent the program from exiting; they are killed automatically when all non-daemon threads finish.

Question 2

Which asyncio function is the standard entry point for running a top-level coroutine in Python 3.7+?

Accepted Answer

asyncio.run()

Answer

asyncio.run() creates a new event loop, runs the given coroutine until completion, and then closes the loop — it is the recommended entry point since Python 3.7.

Question 3

What is a threading.Semaphore and how does it differ from a Lock?

Accepted Answer

A Semaphore maintains a counter allowing a configurable number of threads to access a resource concurrently, unlike a Lock which allows only one

Answer

A Semaphore(n) allows up to n threads to hold it simultaneously; a Lock is equivalent to a Semaphore(1), permitting only one thread at a time.

Question 4

Which module provides the Process class for spawning separate OS processes in Python?

Accepted Answer

multiprocessing

Answer

The multiprocessing module's Process class creates true OS-level processes, each with its own Python interpreter and memory space, bypassing the GIL.

Question 5

What is the purpose of threading.Event in Python multithreading?

Accepted Answer

To enable threads to signal each other — one thread sets the event, others wait for it

Answer

threading.Event provides wait(), set(), and clear() methods, allowing one thread to signal one or more waiting threads that a condition has occurred.

(POC) Python Online Certification Practice Test

(POC) Python Online Certification Practice Test

POC Concurrency & Multithreading 3