How can interaction be carried out between multiple processes in Python?

In Python, interaction between multiple processes can be organized in several ways:

1. multiprocessing module — provides tools for creating processes and exchanging data between them. Specifically, there are Queue, Pipe objects for message passing, and Manager for creating shared objects.

2. File or database exchange — processes can read and write data to shared files or use a database for synchronization and communication.

3. Sockets — processes can communicate via network sockets, which is convenient for distributed systems.

4. System IPC mechanisms (inter-process communication) — such as semaphores, shared memory, message queues (via posix_ipc or sysv_ipc modules).

Example of using multiprocessing.Queue for message exchange:

from multiprocessing import Process, Queue

def worker(q):
    q.put('Hello from child process')

if __name__ == '__main__':
    q = Queue()
    p = Process(target=worker, args=(q,))
    p.start()
    print(q.get())  # Receive message from child process
    p.join()