Python multiprocessing - pipe find prime numbers in an interval

Question

In python 3, I have to find prime numbers in an interval [a,b] using multiprocessing pipes in specific... Here is my code using the pool.map method:

import multiprocessing
import time

def isprime(num):
    if num < 2:
        return None
    for i in range(2, num):
         if (num % i) == 0:
            return None
    else:
        return num

if __name__ == "__main__":
    pool = multiprocessing.Pool(3)
    start_time = time.perf_counter()
    result = list(filter(lambda x: x is not None, pool.map(isprime, range(0,30))))
    finish_time = time.perf_counter()
    print(f"Program finished in {finish_time-start_time} seconds")
    print(result)

i didnt fully understand the pipe method here is the code tht i found as an example while doing my research

from multiprocessing import Process, Pipe

def parentData(parent):
    ''' This function sends the data for the child process '''
    parent.send(['Hello'])
    parent.close()

def childData(child):
    ''' This function sends the data for the parent process '''
    child.send(['Bye'])
    child.close()

if __name__ == '__main__':
    parent, child = Pipe()              # Create Pipe
    process1 = Process(target = parentData, args = (parent, ))      # Create a process for handling parent data
    process2 = Process(target = childData, args = (child, ))        # Create a process for handling child data
    process1.start()                    # Start the  parent process
    process2.start()                    # Start the child process
    print(parent.recv())                # Display data received from child (BYE)
    print(child.recv())                 # Display data received from parent (HELLO)
    process1.join()                     # Wait till the process completes its execution
    process2.join()

Can anyone show me an example of doing the multiprocessing of prime numbers with pipes?