打印内部函数在python中不起作用

我有下面的python代码。当我执行代码时，它总是只显示“程序结束！”。但是没有打印在两个定义中编码的打印语句。是因为 multiprocessing.Process 吗？

注意：我在我的个人笔记本电脑上运行此代码（在 Jupyter notebook 和 Spyder 中都尝试过）

import multiprocessing 
  
def print_cube(num): 
    aa1 = num * num * num
    print("Cube: ",  aa1) 
  
def print_square(num): 
    bb1 = num * num
    print("Square: ", bb1) 
  
def main(): 
    # creating processes 
    p1 = multiprocessing.Process(target=print_square, args=(10, )) 
    p2 = multiprocessing.Process(target=print_cube, args=(10, )) 
  
    # starting process 1 
    p1.start() 

    # starting process 2 
    p2.start() 
    
    # Assumed both processes are finished 
    print("End of the program!") 

main()  

回答

p1.join()
p2.join()
# Assumed both processes are finished
print("End of the program!")

Cube:  1000
Square:  100
End of the program!