一起使用asyncio和Tkinter(或另一个GUI库),而无需冻结GUI - python

我想将asynciotkinter GUI结合使用。
我是asyncio的新手,我对它的理解不是很详细。
单击第一个按钮时,此处的示例启动10个任务。该任务只是用sleep()模拟工作几秒钟。

该示例代码在Python 3.6.4rc1上运行良好。但
问题是GUI被冻结。当我按下第一个按钮并启动10个异步任务时,除非完成所有任务,否则无法在GUI中按下第二个按钮。 GUI永远不会冻结-这是我的目标。

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from tkinter import *
from tkinter import messagebox
import asyncio
import random

def do_freezed():
    """ Button-Event-Handler to see if a button on GUI works. """
    messagebox.showinfo(message='Tkinter is reacting.')

def do_tasks():
    """ Button-Event-Handler starting the asyncio part. """
    loop = asyncio.get_event_loop()
    try:
        loop.run_until_complete(do_urls())
    finally:
        loop.close()

async def one_url(url):
    """ One task. """
    sec = random.randint(1, 15)
    await asyncio.sleep(sec)
    return 'url: {}\tsec: {}'.format(url, sec)

async def do_urls():
    """ Creating and starting 10 tasks. """
    tasks = [
        one_url(url)
        for url in range(10)
    ]
    completed, pending = await asyncio.wait(tasks)
    results = [task.result() for task in completed]
    print('\n'.join(results))


if __name__ == '__main__':
    root = Tk()

    buttonT = Button(master=root, text='Asyncio Tasks', command=do_tasks)
    buttonT.pack()
    buttonX = Button(master=root, text='Freezed???', command=do_freezed)
    buttonX.pack()

    root.mainloop()

_side问题

...是因为这个错误,我无法再次运行任务。

Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python3.6/tkinter/__init__.py", line 1699, in __call__
    return self.func(*args)
  File "./tk_simple.py", line 17, in do_tasks
    loop.run_until_complete(do_urls())
  File "/usr/lib/python3.6/asyncio/base_events.py", line 443, in run_until_complete
    self._check_closed()
  File "/usr/lib/python3.6/asyncio/base_events.py", line 357, in _check_closed
    raise RuntimeError('Event loop is closed')
RuntimeError: Event loop is closed

多线程

谁可以成为多线程解决方案?只有两个线程-每个循环都有自己的线程?

编辑:在审查了这个问题及其答案之后,它几乎与所有GUI库有关(例如PygObject / Gtk,wxWidgets,Qt等)。

参考方案

在对您的代码进行少许修改后,我在主线程中创建了asyncio event_loop并将其作为参数传递给asyncio线程。现在,在提取网址时,Tkinter不会冻结。

from tkinter import *
from tkinter import messagebox
import asyncio
import threading
import random

def _asyncio_thread(async_loop):
    async_loop.run_until_complete(do_urls())


def do_tasks(async_loop):
    """ Button-Event-Handler starting the asyncio part. """
    threading.Thread(target=_asyncio_thread, args=(async_loop,)).start()


async def one_url(url):
    """ One task. """
    sec = random.randint(1, 8)
    await asyncio.sleep(sec)
    return 'url: {}\tsec: {}'.format(url, sec)

async def do_urls():
    """ Creating and starting 10 tasks. """
    tasks = [one_url(url) for url in range(10)]
    completed, pending = await asyncio.wait(tasks)
    results = [task.result() for task in completed]
    print('\n'.join(results))


def do_freezed():
    messagebox.showinfo(message='Tkinter is reacting.')

def main(async_loop):
    root = Tk()
    Button(master=root, text='Asyncio Tasks', command= lambda:do_tasks(async_loop)).pack()
    buttonX = Button(master=root, text='Freezed???', command=do_freezed).pack()
    root.mainloop()

if __name__ == '__main__':
    async_loop = asyncio.get_event_loop()
    main(async_loop)

Python uuid4,如何限制唯一字符的长度 - python

在Python中,我正在使用uuid4()方法创建唯一的字符集。但是我找不到将其限制为10或8个字符的方法。有什么办法吗?uuid4()ffc69c1b-9d87-4c19-8dac-c09ca857e3fc谢谢。 参考方案 尝试:x = uuid4() str(x)[:8] 输出:"ffc69c1b" Is there a way to…

Python-crontab模块 - python

我正在尝试在Linux OS(CentOS 7)上使用Python-crontab模块我的配置文件如下:{ "ossConfigurationData": { "work1": [ { "cronInterval": "0 0 0 1 1 ?", "attribute&…

Python:检查是否存在维基百科文章 - python

我试图弄清楚如何检查Wikipedia文章是否存在。例如,https://en.wikipedia.org/wiki/Food 存在,但是https://en.wikipedia.org/wiki/Fod 不会,页面只是说:“维基百科没有此名称的文章。”谢谢! 参考方案 >>> import urllib >>> prin…

Python Pandas导出数据 - python

我正在使用python pandas处理一些数据。我已使用以下代码将数据导出到excel文件。writer = pd.ExcelWriter('Data.xlsx'); wrong_data.to_excel(writer,"Names which are wrong", index = False); writer.…

Python:在不更改段落顺序的情况下在文件的每个段落中反向单词? - python

我想通过反转text_in.txt文件中的单词来生成text_out.txt文件,如下所示:text_in.txt具有两段,如下所示:Hello world, I am Here. I am eighteen years old. text_out.txt应该是这样的:Here. am I world, Hello old. years eighteen a…