Patch by Davin Potts.

again if the first call to connect() raises an InterruptedError.

When the C function connect() fails with EINTR, the connection runs in
background. We have to wait until the socket becomes writable to be notified
when the connection succeed or fails.

Patch by Hoolean.

are down, don't use anymore in test_urllib2net

the FTP connection failed to fix a ResourceWarning.

returns bool.  tkinter.BooleanVar now validates input values (accepted bool,
int, str, and Tcl_Obj).  tkinter.BooleanVar.get() now always returns bool.

Patch by Makoto Kato.

the wait is cancelled, the future *fut* is now also cancelled.

@unittest.skipUnless(ssl, '...') doesn't work because the class body uses the
nntplib.NNTP_SSL attribute which doesn't exist.

Made test XML files non-ASCII.

arbitrary precision integers added in Tcl 8.5.

result of sendto() instead of the C int type.

See the PEP 475 for the rationale.

Patch by Martin Panter.

Patch by Cédric Krier.

MemoryError.

multiple threads.