TLS 1.3 has a more efficient handshake protocol. The client can reject the server's credentials and close the connection before the server has even finished writing out all of its initial data. Depending on whether the server finishes writing the rest of its handshake before the it sees the connection is reset, the server will read an empty line or see a ECONNRESET OSError. Nothing is really wrong here with the server or client, so just suppress the error output in the OSError case to fix the test.

This fix isn't required in Python 3 because clients that reject the server's certificate will shut down the TLS layer before closing the TCP connection.

(cherry picked from commit f0be4bbb)

[2.7] bpo-35925: Skip SSL tests that fail due to weak external certs or old TLS (GH-13124) (GH-13253)

Modern Linux distros such as Debian Buster have default OpenSSL system
configurations that reject connections to servers with weak certificates
by default. This causes our test suite run with external networking
resources enabled to skip these tests when they encounter such a
failure.

Fixing the network servers is a separate issue.
(cherry picked from commit 2cc0223f)

Changes to test_ssl.py required as 2.7 has legacy protocol tests.

The test_httplib.py change is omitted from this backport as
self-signed.pythontest.net's certificate was updated and the
test_nntplib.py change is not applicable on 2.7.

Authored-by: Gregory P. Smith greg@krypto.org

In Python-2.7, we were only searching for bind_textdomain_codeset in
libc.  We should have also checked for it in libintl.  This change from
Mel Flynn https://bugs.python.org/file24918/python27-configure.in.patch
fixes that.

* [2.7] bpo-36816: Update the self-signed.pythontest.net cert (GH-13192)

We updated the server, our testsuite must match.

https://bugs.python.org/issue36816

✈️ CLE -> DEN ✈️ #pycon2019 #beyonce
(cherry picked from commit 6bd81734)

The 2.7 tree also needed a certificate in the capath directory updated.
The filename for that was determined by `openssl x509 -in $cert.pem -subject_hash`.
Authored-by: Gregory P. Smith <greg@krypto.org>

Patch by Mike Taylor.

(cherry picked from commit c4e78b11)

(cherry picked from commit 11e4a941)
Co-authored-by: Xtreak <tir.karthi@gmail.com>

(cherry picked from commit ee0309f3)
Co-authored-by: Utkarsh Gupta <guptautkarsh2102@gmail.com>

bpo-28552, bpo-7774: Fix distutils.sysconfig if sys.executable is
None or an empty string: use os.getcwd() to initialize project_base.

Fix also the distutils build command: don't use sys.executable if
it's evaluated as false (None or empty string).

(cherry picked from commit 56ed8649)



https://bugs.python.org/issue9194

"make tags" and "make TAGS" now also parse Modules/_io/*.c
and Modules/_io/*.h.

(cherry picked from commit 21a74a9d)

A fix for 69e96910, which resulted in lchmod being disabled on all platforms, not just Linux.

(cherry picked from commit ed709d56)

Set CUSTOMIZED_OSX_COMPILER to True to disable
_osx_support.customize_compiler().

Fix reference leak hunting in regrtest: compute also deltas (of
reference count and file descriptor count) during warmup, to ensure
that everything is initialized before starting to hunt reference
leaks.

Other changes:

* Replace gc.collect() with support.gc_collect() in clear_caches()
* dash_R() is now more quiet with --quiet option (don't display
  progress).
* Precompute the full range for "for it in range(repcount):" to
  ensure that the iteration doesn't allocate anything new.
* dash_R() now is responsible to call warm_caches().

(cherry picked from commit 5aaac94e)

(cherry picked from commit 487b73ab)

bpo-36150: Fix possible assertion failures due to _ctypes.c's PyCData_reduce(). (GH-12106) (GH-12643)

(cherry picked from commit 5f2c5081)

Remove the PyMem_FREE() call added in cb90c89d.  The buffer will be
freed when PyTokenizer_Free() is called on the tokenizer state.
(cherry picked from commit cda139d1)
Co-authored-by: Zackery Spytz <zspytz@gmail.com>

(cherry picked from commit d5a5a33f)
Co-authored-by: Philipp A <flying-sheep@web.de>

(cherry picked from commit f760610b)
Co-authored-by: Andre Delfino <adelfino@gmail.com>

(cherry picked from commit 6cd658b1)
Co-authored-by: Tal Einat <taleinat+github@gmail.com>


https://bugs.python.org/issue34203

(cherry picked from commit 0523c39e)
Co-authored-by: Zackery Spytz <zspytz@gmail.com>

* bpo-34085: Improve wording on classmethod/staticmethod

* Address comments from Éric

* Address comments from Éric
(cherry picked from commit 548cb606)
Co-authored-by: Andre Delfino <adelfino@gmail.com>

Add missing Py_DECREF()s.

(cherry picked from commit cb90c89d)

(cherry picked from commit fc8284e2)
Co-authored-by: Jean-François B <jfbu@free.fr>

(cherry picked from commit 9ae513ca)

(cherry picked from commit 74ae50e5)
Co-authored-by: CAM Gerlach <CAM.Gerlach@Gerlach.CAM>

Fix buffer overflow in send() and sendall() methods of socket.socket
for data larger than 2 GiB.

(cherry picked from commit dfc8fc15fa989acba3c372572e52bbcb5ab38a37)

The test test_customize_compiler() now mocks all sysconfig variables
and all environment variables used by customize_compiler().

(cherry picked from commit 72c7b372)

Fix CFLAGS in customize_compiler() of distutils.sysconfig: when the
CFLAGS environment variable is defined, don't override CFLAGS variable with
the OPT variable anymore.

Initial patch written by David Malcolm.
Co-Authored-By: David Malcolm <dmalcolm@redhat.com>
(cherry picked from commit 86082c22)

Fix an unlikely memory leak on conversion from string to float in the
function _Py_dg_strtod() used by float(str), complex(str),
pickle.load(), marshal.load(), etc.

Fix an unlikely memory leak in _Py_dg_strtod() on "undfl:" label:
rewrite memory management in this function to always release all
memory before exiting the function. Initialize variables to NULL, and
set them to NULL after calling Bfree() at the "cont:" label.

Note: Bfree(NULL) is well defined: it does nothing.

(cherry picked from commit 9776b063)