python线程按照顺序执行_Tkinter：通过单击按钮来调度顺序执行的线程

下面是一些演示如何做你想做的事情。它之所以有效，是因为在主线程以外的线程中运行的代码不会进行任何tkinter调用。为了让线程一个接一个地按顺序运行，它使用一个FIFOQueue表示每个线程的条目，并在最后一个线程完成后开始新的线程的运行。在

要按照start_all()函数中所做的那样，按照一定的顺序“调度”一系列步骤，只需put()按照它们应该在此job_queue的顺序执行每个步骤。在

这一切都是通过反复使用通用的^{}方法定期运行一个“polling”函数（名为poll）来完成的，该函数检查另一个线程当前是否正在执行，并相应地作出反应。在

在代码中，每个线程所做的处理被称为“步骤”或“作业”。在from queue import Queue, Empty

import random

import tkinter as tk

from tkinter import ttk

import tkinter.messagebox as tkMessageBox

from threading import Thread

from time import sleep

random.seed(42) # Generate repeatable sequence for testing.

ITERATIONS = 100

POLLING_RATE = 100 # millisecs.

# Global variables

cur_thread = None # Current running thread.

cur_button = None

cur_name = None

job_queue = Queue() # FIFO queue.

def sample_function():

for i in range(1, ITERATIONS):

print(i)

sleep(0.01) # Simulate slow I/O.

def start_thread(name, func, btn_variable):

global cur_thread, cur_button

if cur_thread is not None:

tkMessageBox.showerror('Error', "You can't start a step when there"

" are some already running.")

return

cur_thread = Thread(target=func)

cur_button = btn_variable

btn_variable.configure(style='blue.TButton')

cur_thread.start()

def poll(window, processing_bar):

global cur_thread, cur_button

if cur_thread is not None:

if cur_thread.is_alive():

processing_bar.step()

else:

cur_thread.join() # Should be immediate.

cur_thread = None

processing_bar.stop()

cur_button.configure(style='green.TButton')

window.update()

elif not job_queue.empty(): # More to do?

try:

job_info = job_queue.get_nowait() # Non-blocking.

start_thread(*job_info)

processing_bar.start()

window.update()

except Empty: # Just in case (shouldn't happen).

pass

window.after(POLLING_RATE, poll, window, processing_bar)

# Button commands.

def prepare_clicked():

start_thread('prepare', sample_function, prepare_btn)

def social_clicked():

start_thread('social', sample_function, social_btn)

def anomaly_clicked():

start_thread('anomaly', sample_function, anomaly_btn)

def scoring_clicked():

start_thread('scoring', sample_function, scoring_btn)

def dashboard_clicked():

start_thread('dashboard', sample_function, dashboard_btn)

def start_all():

global job_queue

# Put info for each step in the job queue to be run.

for job_info in (('prepare', sample_function, prepare_btn),

('social', sample_function, social_btn),

('anomaly', sample_function, anomaly_btn),

('scoring', sample_function, scoring_btn),

('dashboard', sample_function, dashboard_btn)):

job_queue.put(job_info)

# Start the polling.

window.after(POLLING_RATE, poll, window, processing_bar)

####

window = tk.Tk()

#window = tk.Toplevel()

topFrame = tk.Frame(window)

bottomFrame = tk.Frame(window)

# Tell the Frame to fill the whole window

topFrame.pack(fill=tk.BOTH, expand=1)

bottomFrame.pack(fill=tk.BOTH, expand=1)

# Make the Frame grid contents expand & contract with the window

topFrame.columnconfigure(0, weight=1)

for i in range(5):

topFrame.rowconfigure(i, weight=1)

bottomFrame.rowconfigure(0, weight=1)

for i in range(3):

bottomFrame.columnconfigure(i, weight=1)

ttk.Style().configure('blue.TButton', foreground='blue')

ttk.Style().configure('green.TButton', foreground='green')

ttk.Style().configure('red.TButton', foreground='red')

prepare_btn = ttk.Button(topFrame, command=prepare_clicked, text='Button 1', style='red.TButton')

anomaly_btn = ttk.Button(topFrame, command=anomaly_clicked, text='Button 2', style='red.TButton')

social_btn = ttk.Button(topFrame, command=social_clicked, text='Button 3', style='red.TButton')

scoring_btn = ttk.Button(topFrame, command=scoring_clicked, text='Button 4', style='red.TButton')

dashboard_btn = ttk.Button(topFrame, command=dashboard_clicked, text='Button 5', style='red.TButton')

commentary = ttk.Button(bottomFrame, text='START', width=10, command=start_all)

commentarylabel = ttk.Label(bottomFrame, text=' Commentary ', width=25)

processing_bar = ttk.Progressbar(bottomFrame, orient='horizontal', mode='indeterminate')

prepare_btn.grid (row=0, column=0, columnspan=1, sticky='EWNS')

anomaly_btn.grid (row=1, column=0, columnspan=1, sticky='EWNS')

social_btn.grid (row=2, column=0, columnspan=1, sticky='EWNS')

scoring_btn.grid (row=3, column=0, columnspan=1, sticky='EWNS')

dashboard_btn.grid (row=4, column=0, columnspan=1, sticky='EWNS')

commentary.grid (row=0, column=0, columnspan=1, sticky='EWNS')

commentarylabel.grid(row=0, column=1, columnspan=2, sticky='EWNS')

processing_bar.grid (row=0, column=3,columnspan=1, sticky='EWNS')

window.after(POLLING_RATE, poll, window, processing_bar)

window.mainloop()