如何同时运行相同的python函数

Question

我想在这个程序中尝试多次运行函数graph，但目前它甚至没有运行一次。任何人都可以解释原因，并给我一些修复它的代码吗？

from matplotlib import pyplot as plt
import numpy as np
import matplotlib
import random
from multiprocessing import Process

max_x_val = int(input("What is the maximum x value? "))
max_y_val = int(input("What is the maximum y value? "))
counter = 0


points = int(input("How many points to be plotted? "))
plotted = []

notifications = (input("Do you want to see which point is being ploted?(Y/N) ")).lower() 



def graph(max_x_val, max_y_val, points, plotted, notifications): 
    for i in range (1,points):
        x = random.randint(0,max_x_val)
        y = random.randint(0,max_y_val)

        xstr = str(x)
        ystr = str(y)
        point = (str("(" + xstr + "," + ystr +")"))
        plotted.append(point)
        if (plotted.count(point)) == 1 : c="tab:blue"
        elif (plotted.count(point)) == 2 : c="tab:cyan"
        elif (plotted.count(point)) == 3 : c="tab:green"
        elif (plotted.count(point)) == 4 : c="y"
        elif (plotted.count(point)) == 5 : c="tab:orange"
        elif (plotted.count(point)) >= 6 : c="tab:red"
        plt.scatter(x=x,y=y, c=c)
        if notifications == "y" : print(len(plotted))    
    plt.show()    
    print (plotted)

if __name__=="__main__":
    p1 = Process (target=graph)
    p1.start()
    p2 = Process (target=graph)
    p2.start()