Patch by Olive Kilburn.

Add note to demohelp.txt about doing so.

than 100 ms to be executed.

to be executed.

issue 20091 - index entry for __main__ in runpy docs.

Patch by Ben Hoyt.

reads all available bytes from the "self pipe", not only a single byte. This
change reduces the risk of having the pipe full and so getting the innocuous
"BlockingIOError: [Errno 11] Resource temporarily unavailable" message.

available bytes from the "self pipe", not only a single byte. This change
reduces the risk of having the pipe full and so getting the innocuous
"BlockingIOError: [Errno 11] Resource temporarily unavailable" message.

parameters are bytes or character strings