tk.after 接受普通函数，而不是协程.要将协程运行到完成，您可以使用 run_until_complete，就像您第一次一样:

tk.after accepts a normal function, not a coroutine. To run the coroutine to completion, you can use run_until_complete, just as you did the first time:

loop = asyncio.get_event_loop()
root.after(10000, lambda: loop.run_until_complete(updateLoans()))

此外，不要调用 loop.close()，因为您将再次需要循环.上述快速修复适用于许多用例.然而，事实是，如果 updateLoans() 由于网络缓慢或远程服务问题而需要很长时间，它将使 GUI 完全无响应.一个好的 GUI 应用会希望避免这种情况.

Also, don't call loop.close(), since you'll need the loop again.

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The above quick fix will work fine for many use cases. The fact is, however, that it will render the GUI completely unresponsive if updateLoans() takes a long time due to slow network or a problem with the remote service. A good GUI app will want to avoid this.

虽然 Tkinter 和 asyncio 尚不能共享事件循环，但完全可以运行 asyncio 事件在一个单独的线程中循环.主线程然后运行 ​​GUI，而专用的 asyncio 线程运行所有 asyncio 协程.当事件循环需要通知 GUI 刷新某些内容时，它可以使用队列 如下所示一>.另一方面，如果 GUI 需要告诉事件循环做某事，它可以调用 call_soon_threadsafe 或 run_coroutine_threadsafe.

While Tkinter and asyncio cannot share an event loop yet, it is perfectly possible to run the asyncio event loop in a separate thread. The main thread then runs the GUI, while a dedicated asyncio thread runs all asyncio coroutines. When the event loop needs to notify the GUI to refresh something, it can use a queue as shown here. On the other hand, if the GUI needs to tell the event loop to do something, it can call call_soon_threadsafe or run_coroutine_threadsafe.

示例代码(未经测试):

Example code (untested):

gui_queue = queue.Queue()

async def updateLoans():
    while True:
        offers = await dd.loanOffers()
        demands = await dd.loanDemands()
        print('loans obtained')
        gui_queue.put(lambda: updateLoansGui(offers, demands))
        await asyncio.sleep(10)

def updateLoansGui(offers, demands):
    w.LoanOfferView.delete(1.0, END)
    w.LoanDemandView.delete(1.0, END)
    w.LoanOfferView.insert(END, offers)
    w.LoanDemandView.insert(END, demands)
    print('loans GUI refreshed')

# http://effbot.org/zone/tkinter-threads.htm
def periodicGuiUpdate():
    while True:
        try:
            fn = gui_queue.get_nowait()
        except queue.Empty:
            break
        fn()
    root.after(100, periodicGuiUpdate)

# Run the asyncio event loop in a worker thread.
def start_loop():
    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)
    loop.create_task(updateLoans())
    loop.run_forever()
threading.Thread(target=start_loop).start()

# Run the GUI main loop in the main thread.
periodicGuiUpdate()
root.mainloop()

# To stop the event loop, call loop.call_soon_threadsafe(loop.stop).
# To start a coroutine from the GUI, call asyncio.run_coroutine_threadsafe.