python线程问题 threads can only be started once

Question

代码如下：

import tkinter as tk
from tkinter import ttk
from threading import Thread
import time

class main():
def method(self):
for i in range(3):
time.sleep(1)
print(i)

op = main()
runT = Thread(target=op.method)
win = tk.Tk()
win.title("Python")

def click():
runT.start()

action = ttk.Button(win, text="Click Me!", command=click) # 7
action.grid(column=0, row=0)
win.mainloop()

我想每次点击下按钮就执行一次，但是python线程只能执行一次 按钮第二次点击就报错threads can only be started once 请问如何才能解决呢？

Answer 1

因为你只建立了一个进程，这个进程只能管理当前的一次操作。
因此可以每次点击的时候都重新建立一个进程，如下所示。

 import tkinter as tk
from tkinter import ttk
from threading import Thread
import time


class main:
    def newThread(self):
        Thread(target=self.method).start()

    def method(self):
        for i in range(3):
            time.sleep(1)
            print(i)

op = main()
win = tk.Tk()
win.title("Python")

def click():
    op.newThread()

action = ttk.Button(win, text="Click Me!", command=click) # 7
action.grid(column=0, row=0)
win.mainloop()