inherits from TypeError. Cleanup in module initialization to make repeated
import failures robust.

append, extend and insert now consistently type-check their argument in both
the C and Python implementations, and raise TypeError for non-Element
argument.

Added tests

Éric pointed out that given that the default was documented as None, someone
would reasonably pass that to get the default behavior.  In fixing the code to
use None, I noticed that the change to _charset was being done after it had
already been passed to MIMENonMultipart.  The change to the test verifies that
the order is now correct.

Previously it would just accept the unicode, which would wind up as unicode in
the transfer-encoded message object, which is just wrong.

Patch by Jeff Knupp.

(Original patch by Vinay Sajip)

fix #10340: properly handle EINVAL on OSX and also avoid to call handle_connect() in case of a disconnetected socket which is not meant to connect.

fix #10340: properly handle EINVAL on OSX and also avoid to call handle_connect() in case of a disconnetected socket which is not meant to connect.

w cannot be NULL so use Py_DECREF() instead of Py_XDECREF().

Issue #14204: The ssl module now has support for the Next Protocol Negotiation extension, if available in the underlying OpenSSL library.
Patch by Colin Marc.