On 12/31/2017 8:52 PM, Terry Reedy wrote:
To do everything in the main thread, one can replace 'root.mainloop'
with loop.run_forever (in the main thread) and repeated root.update calls.
Wu Xi's example, rewritten more or less as suggested:
from tkinter import *
from tkinter import messagebox
import asyncio
import random
async def one_url(url):
""" One task. """
sec = random.randint(1, 8)
await asyncio.sleep(sec )
return 'url: {} --- sec: {}'.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_nofreeze():
messagebox.showinfo(message='see, Tkinter is still responsive')
def widgets(master):
Button(master, text='Frozen?', command=do_nofreeze).pack()
# A production version of this should make it possible to cancel.
# However, when loop stops, updates will stop.
def tk_update(interval):
root.update()
loop.call_later(interval, tk_update)
if __name__ == '__main__':
root = Tk()
widgets(root)
loop = asyncio.get_event_loop()
tk_update(.01)
loop.run_until_complete(do_urls())
--
Terry Jan Reedy
--
https://mail.python.org/mailman/listinfo/python-list
