the version it was improved in.

input buffer.

is automatically closed.

an internal XML encoding is UTF-8 or US-ASCII.  It now accepts bytes and
strings larger than 2 GiB.

The main docs were fixed to remove mention of None long ago,
but the docstring was not.  Reported by Armin Rigo, patch
by Ian Cordasco.

universal_newlines is true as on Windows.

skipTest() already raises an exception.

parses nested mutating sequence.

with it a vareity of bug fixes, both security and behavior.  See
http://www.libexpat.org/ for the list.

NOTE: I already backported the expat hash randomization fix in March.

Fixes issue #14340.

stream or a decoder produces data of an unexpected type (i.e. when
io.TextIOWrapper initialized with text stream or use bytes-to-bytes codec).

deployment target prior to 10.6.

Issue #15633: httplib.HTTPResponse is now mark closed when the server sends less than the advertised Content-Length.

Remove trailing dots on Windows.

supported.

Retina displays.  Applies to Tkinter apps, such as IDLE, on OS X
framework builds linked with Cocoa Tk 8.5+.
Suggested by Kevin Walzer

constructors once, to avoid memory leaks when finalizing and re-initializing
the Python interpreter.

Additional fix for Issue #12268: The io module file object writelines() methods no longer abort early when one of its write system calls is interrupted (EINTR).

its destination path when extracting malicious zip files.