How can we obtain a distinct identifier for a worker in a multiprocessing pool using Python?

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The multiprocessing module in Python provides a way to obtain a distinct identifier for a worker in a multiprocessing pool. This identifier is called the process ID (PID) and can be obtained using the os.getpid() function.

Here's an example of how to use os.getpid() to obtain the PID of each worker in a multiprocessing pool:

import multiprocessing
import os

def worker():
    print(f"Worker PID: {os.getpid()}")

if __name__ == '__main__':
    pool = multiprocessing.Pool(processes=4)
    pool.map(worker, range(4))
    pool.close()
    pool.join()

In this example, we create a pool of 4 workers and map the worker function onto each worker in the pool. Inside the worker function, we use os.getpid() to obtain the PID of the current worker and print it to the console. When we run the script, it should output something like this:

Worker PID: 1234
Worker PID: 1235
Worker PID: 1236
Worker PID: 1237

where each PID is a unique identifier for each worker in the pool.