https://qiita.com/f-ym/questions/851bf34c2744db030614#answer-c2c07ef40f663bba96e1

tkinter_multiprocess_pipe.py

import time
from multiprocessing import Process, Pipe
from tkinter import Tk, ttk, StringVar


def execute():
    """
    コマンド実行
    """
    print('コマンドボタン　押下')
    args = [arg for arg in map(str.strip, cmd.get().split(',')) if arg]
    cmd.set("")
    if args:
        if args[0] == '加算':
            start_proc(add, args)
        elif args[0] == '減算':
            pass
    print('コマンドボタン　押下処理終了')



def start_proc(func, args):
    """
    プロセス起動
    """
    print('プロセス作成')
    proc = Process(name=func.__name__, target=func, args=(pipe_snd, args))
    proc.daemon = True
    proc.start()



def add(pipe, args):
    """
    加算プロセス
    """
    ans = int(args[1]) + int(args[2])
    for data in range(ans, ans + 5):
        pipe.send(data)
        print('データ送出', data)
        time.sleep(1)


def receive():
    """
    受信処理
    """
    if pipe_rcv.poll():
        data = pipe_rcv.recv()
        print('データ受信', data)
        ans.set(data)
    root.after(200, receive)


if __name__ == "__main__":
    pipe_rcv, pipe_snd = Pipe()  # 双方向Pipe生成

    root = Tk()
    frame = ttk.Frame(root, padding=1, borderwidth=10, relief='solid')
    frame.pack(fill='x')

    ans = StringVar()
    ans.set("ans=")
    ans_lbl = ttk.Label(frame, textvariable=ans, relief='solid')
    ans_lbl.pack(fill='x', pady=5)

    cmd = StringVar()
    cmd.set('加算,1,2')
    cmd_ent = ttk.Entry(frame, textvariable=cmd)
    cmd_ent.pack(fill='x', pady=5)

    exe_btn = ttk.Button(frame, command=execute, text="実　行")
    exe_btn.pack(fill='x', pady=5)

    root.after(200, receive)
    root.mainloop()