exception if the event loop is running. You must first stop the event loop and
then wait until it stopped, before closing it.

event loop is running. You must first stop the event loop and then wait until
it stopped, before closing it.

PYTHONASYNCIODEBUG env var enables debug mode of the event loop.

enables debug mode of the event loop.

PYTHONASYNCIODEBUG environment variable is set

environment variable is set

raises an exception if the current loop is not None.

Guido van Rossum wrote:

"The behavior that you can set the loop to None (and keep track of it
explicitly) is part of the spec, and this should still be supported even in
debug mode. The behavior that we raise an error if you are caught having
multiple active loops per thread is just a debugging heuristic, and it
shouldn't break code that follows the spec."

exception if the current loop is not None.

Guido van Rossum wrote:

"The behavior that you can set the loop to None (and keep track of it
explicitly) is part of the spec, and this should still be supported even in
debug mode. The behavior that we raise an error if you are caught having
multiple active loops per thread is just a debugging heuristic, and it
shouldn't break code that follows the spec."

Patch by Nikolaus Rath.

Patch by Olive Kilburn.

Add note to demohelp.txt about doing so.