Hello
Python's doc says about loop.call_soon(callback, *arg):
Arrange for a callback to be called as soon as possible. The callback is called
after call_soon() returns, when control returns to the event loop.
But it doesn't seem to be true; see this program:
import asyncio
async def task_func():
print("Entering task_func")
def callback():
print("Entering callback")
async def main():
print("Entering main")
task = loop.create_task(task_func())
loop.call_soon(callback)
await task
loop = asyncio.get_event_loop()
loop.run_until_complete(main())
Execution provides following output:
Entering main
Entering task_func
Entering callback
callback is executed AFTER task_func, I expected it
to be executed BEFORE.
When "main()" coroutine reach line "await task", it let the control
to the event loop, and it seems that the loop starts to execute
task instead of callback. Then, when task is over the loop runs
callback
This is not what the doc says: callback should be called as soon
as possible when the loop has control, with a priority over other
tasks pending in the loop
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