>>> help(Process.join)
join(self, timeout=None)
    Wait until child process terminates

from multiprocessing import Process
from time import sleep
     
def worker(n):
    print("the worker went to the office")  
    sleep(n)
    print("the worker has been walking for %d sec" % n)
     
if __name__ == "__main__":
    plist = [] 
    for i in range(4, 0, -1):
        proc = Process(target=worker, args=(i,))
        plist.append(proc)
     
    for proc in plist:
        proc.start()

the worker went to the office
the worker went to the office
the worker went to the office
the worker went to the office
the worker has been walking for 1 sec
the worker has been walking for 2 sec
the worker has been walking for 3 sec
the worker has been walking for 4 sec

from matplotlib import pyplot as plt
import numpy as np
#функция
x = np.arange(0.1, 10, 1*(10**-2))
y = np.sin(x) + np.log(x)
#полином 1 степени по функции
p = np.polyfit(x,y, 1)
#подставляем значения x к полученному полиному
ya = np.polyval(p, x)

plt.plot(x, y)
plt.plot(x, ya)

plt.show()