When running a prompt-toolkit Dialog it will flicker if there is terminal output from a different asyncio task.
I am using the context with patch_stdout() within a task as mentioned in the doc, at least as far as I understand it. I read somewhere that starting with prompt-toolkit 3.0 it uses the default asyncio event loop and does not create one itself.
And since asyncio.run always creates a new event loop and closes it at the end and the context manager is within that, I have no clue what could be the reason for the flickering. What am I missing?
(Python 3.9, prompt-toolkit 3.0.36)
This is a MCVE:
import asyncio
from prompt_toolkit.patch_stdout import patch_stdout
from prompt_toolkit.shortcuts.dialogs import _create_app, _return_none
from prompt_toolkit.widgets import Button, Dialog, Label
dialog_align = Dialog(
title='Please align',
body=Label(text="init", dont_extend_height=True),
buttons=[Button(text='Start measurement', width=21, handler=_return_none)],
with_background=True,
)
async def prompt_align():
return await _create_app(dialog_align, style=None).run_async()
async def main_datasource():
while True:
await asyncio.sleep(0.5)
print("test")
async def main():
with patch_stdout():
task1 = asyncio.create_task(prompt_align())
task2 = asyncio.create_task(main_datasource())
await asyncio.gather(task1, task2)
if __name__ == "__main__":
try:
from asyncio import run
except ImportError:
asyncio.run_until_complete(main())
else:
asyncio.run(main())
When running a prompt-toolkit Dialog it will flicker if there is terminal output from a different asyncio task.
I am using the context with patch_stdout() within a task as mentioned in the doc, at least as far as I understand it. I read somewhere that starting with prompt-toolkit 3.0 it uses the default asyncio event loop and does not create one itself.
And since asyncio.run always creates a new event loop and closes it at the end and the context manager is within that, I have no clue what could be the reason for the flickering. What am I missing?
(Python 3.9, prompt-toolkit 3.0.36)
This is a MCVE: