==================

- Many HTTP proxies has buggy keepalive support. Let's not reuse connection but
close it after processing every response. (`3070 <https://github.com/aio-libs/aiohttp/pull/3070>`_)

- Provide vendor source files in tarball (`3076 <https://github.com/aio-libs/aiohttp/pull/3076>`_)

==================

- Fix ``sock_read`` timeout. (`3053 <https://github.com/aio-libs/aiohttp/pull/3053>`_)
- When using a server-request body as the ``data=`` argument of a client request,
iterate over the content with ``readany`` instead of ``readline`` to avoid ``Line
too long`` errors. (`3054 <https://github.com/aio-libs/aiohttp/pull/3054>`_)

==================

Features
--------

- Raise ``ConnectionResetError`` instead of ``CancelledError`` on trying to
write to a closed stream. (`2499 <https://github.com/aio-libs/aiohttp/pull/2499>`_)
- Implement ``ClientTimeout`` class and support socket read timeout. (`2768 <https://github.com/aio-libs/aiohttp/pull/2768>`_)
- Enable logging when ``aiohttp.web`` is used as a program (`2956 <https://github.com/aio-libs/aiohttp/pull/2956>`_)
- Add canonical property to resources (`2968 <https://github.com/aio-libs/aiohttp/pull/2968>`_)
- Forbid reading response BODY after release (`2983 <https://github.com/aio-libs/aiohttp/pull/2983>`_)
- Implement base protocol class to avoid a dependency from internal
``asyncio.streams.FlowControlMixin`` (`2986 <https://github.com/aio-libs/aiohttp/pull/2986>`_)
- Cythonize ``helpers.reify``, 5% boost on macro benchmark (`2995 <https://github.com/aio-libs/aiohttp/pull/2995>`_)
- Optimize HTTP parser (`3015 <https://github.com/aio-libs/aiohttp/pull/3015>`_)
- Implement ``runner.addresses`` property. (`3036 <https://github.com/aio-libs/aiohttp/pull/3036>`_)
- Use ``bytearray`` instead of a list of ``bytes`` in websocket reader. It
improves websocket message reading a little. (`3039 <https://github.com/aio-libs/aiohttp/pull/3039>`_)
- Remove heartbeat on closing connection on keepalive timeout. The used hack
violates HTTP protocol. (`3041 <https://github.com/aio-libs/aiohttp/pull/3041>`_)
- Limit websocket message size on reading to 4 MB by default. (`3045 <https://github.com/aio-libs/aiohttp/pull/3045>`_)


Bugfixes
--------

- Don't reuse a connection with the same URL but different proxy/TLS settings
(`2981 <https://github.com/aio-libs/aiohttp/pull/2981>`_)
- When parsing the Forwarded header, the optional port number is now preserved.
(`3009 <https://github.com/aio-libs/aiohttp/pull/3009>`_)


Improved Documentation
----------------------

- Make Change Log more visible in docs (`3029 <https://github.com/aio-libs/aiohttp/pull/3029>`_)
- Make style and grammar improvements on the FAQ page. (`3030 <https://github.com/aio-libs/aiohttp/pull/3030>`_)
- Document that signal handlers should be async functions since aiohttp 3.0
(`3032 <https://github.com/aio-libs/aiohttp/pull/3032>`_)


Deprecations and Removals
-------------------------

- Deprecate custom application's router. (`3021 <https://github.com/aio-libs/aiohttp/pull/3021>`_)


Misc
----

- 3008, 3011

==================

- Don't reuse a connection with the same URL but different proxy/TLS settings
(`2981 <https://github.com/aio-libs/aiohttp/pull/2981>`_)

==================

Features
--------

- Raise ``TooManyRedirects`` exception when client gets redirected too many
times instead of returning last response. (`2631 <https://github.com/aio-libs/aiohttp/pull/2631>`_)
- Extract route definitions into separate ``web_routedef.py`` file (`2876 <https://github.com/aio-libs/aiohttp/pull/2876>`_)
- Raise an exception on request body reading after sending response. (`2895 <https://github.com/aio-libs/aiohttp/pull/2895>`_)
- ClientResponse and RequestInfo now have real_url property, which is request
url without fragment part being stripped (`2925 <https://github.com/aio-libs/aiohttp/pull/2925>`_)
- Speed up connector limiting (`2937 <https://github.com/aio-libs/aiohttp/pull/2937>`_)
- Added and links property for ClientResponse object (`2948 <https://github.com/aio-libs/aiohttp/pull/2948>`_)
- Add ``request.config_dict`` for exposing nested applications data. (`2949 <https://github.com/aio-libs/aiohttp/pull/2949>`_)
- Speed up HTTP headers serialization, server micro-benchmark runs 5% faster
now. (`2957 <https://github.com/aio-libs/aiohttp/pull/2957>`_)
- Apply assertions in debug mode only (`2966 <https://github.com/aio-libs/aiohttp/pull/2966>`_)


Bugfixes
--------

- expose property `app` for TestClient (`2891 <https://github.com/aio-libs/aiohttp/pull/2891>`_)
- Call on_chunk_sent when write_eof takes as a param the last chunk (`2909 <https://github.com/aio-libs/aiohttp/pull/2909>`_)
- A closing bracket was added to `__repr__` of resources (`2935 <https://github.com/aio-libs/aiohttp/pull/2935>`_)
- Fix compression of FileResponse (`2942 <https://github.com/aio-libs/aiohttp/pull/2942>`_)
- Fixes some bugs in the limit connection feature (`2964 <https://github.com/aio-libs/aiohttp/pull/2964>`_)


Improved Documentation
----------------------

- Drop ``async_timeout`` usage from documentation for client API in favor of
``timeout`` parameter. (`2865 <https://github.com/aio-libs/aiohttp/pull/2865>`_)
- Improve Gunicorn logging documentation (`2921 <https://github.com/aio-libs/aiohttp/pull/2921>`_)
- Replace multipart writer `.serialize()` method with `.write()` in
documentation. (`2965 <https://github.com/aio-libs/aiohttp/pull/2965>`_)


Deprecations and Removals
-------------------------

- Deprecate Application.make_handler() (`2938 <https://github.com/aio-libs/aiohttp/pull/2938>`_)


Misc
----

- 2958

------------------

* Add an API for requesting new session explicitly 281

------------------

* Fix a bug for session fixation 272

Bug Fixes

* Use a proper type for the thread indent (fixes 32-bit build for 3.7.)
(by 1st1 in 700582a9 for 172)

* Fix cancellation race in `loop.sock_recv()` and `loop.sock_recv_into()`
methods.  (by andr-04 and 1st1 in 298851bf for 169)

* Sync SSL error messages with CPython's SSL implementation.
(by 1st1 in c3aeff2a)

* Fix `SSLTransport.abort()` to mark the transport as closed.
(by 1st1 in ba25d8be)

* Detect if libuv submodule has not been checked out in `setup.py`.
(by 1st1 in dd8060d2)

Bug Fixes
=======

* Bump Cython from 0.28.2 to 0.28.3.
(by 1st1 in 5044d240)

* Increase default SSL handshake timeout to 60 seconds.
(by 1st1 in 70c332cf, fixes 161)

* Add `ssl_handshake_timeout` parameter to `loop.create_connection()`, 
`loop.create_server()`, `loop.create_unix_connection()`,
`loop.create_unix_server()`, `loop.connect_accepted_socket()`.
(by 1st1 in 68dd7337, addresses 161)

* Consistently close transports if create_server/create_connection/etc
timeout or cancelled.
(by 1st1 in ac90d8bd and 77ee4f96)

New Features
============

* Initial support for Python 3.7.
(by pfreixes in c3a5ec8e for 138)

* Implement PEP 567 support (contextvars module) for Python 3.7.
(by 1st1 in 2a4fab44, 878e4163, and b2bdaae3 for 155)

* Add uvloop's own version of `asyncio/sslproto.py`. SSL is now ~50% faster.
(by 1st1 in 4d912643)

* Convert Future-returning loop methods to coroutines to match asyncio 3.7.
(by 1st1 in 7384b22f)

* Allow file objects to be passed to `loop.subprocess*()` functions.
(by 1st1 in f0830901 for 136)

* Make signals processing more reliable.
(by 1st1 in 6e03e513)

* Prohibit adding a signal handler for `SIGCHLD`.
(by 1st1 in cd53b7f5 for 156)

* Add `uvloop.__version__`.
(by 1st1 in 740cb7f3 for 137)


Bug Fixes
=========

* Upgrade to Cython 0.28.2.
(by 1st1 in 98bdb553 for 122)

* Update libuv from v1.17.0 to v1.20.3.
(by 1st1 in 572524a6)

* Make sure UDP handles are cleaned-up properly.
(by 1st1 in 13f63e00)

* Fix `subprocess.close()` to let its processes die gracefully.
(by 1st1 in a78e4d27 and a455af3d for 128)

* Fix `sock_connect()` to resolve addresses for correct socket family.
(by 1st1 in ce2bd4fb for 139)

* Fix a race condition in SSL handshake.
(by 1st1 in 447e124f)

=====================================

Bugs fixed
----------

* 4924: html search: Upper characters problem in any other languages
* 4932: apidoc: some subpackage is ignored if sibling subpackage contains a
module starting with underscore
* 4863, 4938, 4939: i18n doesn't handle node.title correctly tat used for
contents, topic, admonition, table and section.
* 4913: i18n: literal blocks in bullet list are not translated
* 4962: C++, raised TypeError on duplicate declaration.
* 4825: C++, properly parse expr roles and give better error messages when
(escaped) line breaks are present.
* C++, properly use ``desc_addname`` nodes for prefixes of names.
* C++, parse pack expansions in function calls.
* 4915, 4916: links on search page are broken when using dirhtml builder
* 4969: autodoc: constructor method should not have return annotation
* latex: deeply nested enumerated list which is beginning with non-1 causes
LaTeX engine crashed
* 4978: latex: shorthandoff is not set up for Brazil locale
* 4928: i18n: Ignore dot-directories like .git/ in LC_MESSAGES/
* 4946: py domain: type field could not handle "None" as a type
* 4979: latex: Incorrect escaping of curly braces in index entries
* 4956: autodoc: Failed to extract document from a subclass of the class on
mocked module
* 4973: latex: glossary directive adds whitespace to each item
* 4980: latex: Explicit labels on code blocks are duplicated
* 4919: node.asdom() crashes if toctree has :numbered: option
* 4914: autodoc: Parsing error when using dataclasses without default values
* 4931: autodoc: crashed when handler for autodoc-skip-member raises an error
* 4931: autodoc: crashed when subclass of mocked class are processed by
napoleon module
* 5007: sphinx-build crashes when error log contains a "%" character

------------------

New checks:

* Add W504 warning for checking that a break doesn't happen after a binary
operator. This check is ignored by default. PR 502.
* Add W605 warning for invalid escape sequences in string literals. PR 676.
* Add W606 warning for 'async' and 'await' reserved keywords being introduced
in Python 3.7. PR 684.
* Add E252 error for missing whitespace around equal sign in type annotated
function arguments with defaults values. PR 717.

Changes:

* An internal bisect search has replaced a linear search in order to improve
efficiency. PR 648.
* pycodestyle now uses PyPI trove classifiers in order to document supported
python versions on PyPI. PR 654.
* 'setup.cfg' '[wheel]' section has been renamed to '[bdist_wheel]', as
the former is legacy. PR 653.
* pycodestyle now handles very long lines much more efficiently for python
3.2+. Fixes 643. PR 644.
* You can now write 'pycodestyle.StyleGuide(verbose=True)' instead of
'pycodestyle.StyleGuide(verbose=True, paths=['-v'])' in order to achieve
verbosity. PR 663.
* The distribution of pycodestyle now includes the license text in order to
comply with open source licenses which require this. PR 694.
* 'maximum_line_length' now ignores shebang ('!') lines. PR 736.
* Add configuration option for the allowed number of blank lines. It is
implemented as a top level dictionary which can be easily overwritten. Fixes
732. PR 733.

Bugs:

* Prevent a 'DeprecationWarning', and a 'SyntaxError' in future python, caused
by an invalid escape sequence. PR 625.
* Correctly report E501 when the first line of a docstring is too long.
Resolves 622. PR 630.
* Support variable annotation when variable start by a keyword, such as class
variable type annotations in python 3.6. PR 640.
* pycodestyle internals have been changed in order to allow 'python3 -m
cProfile' to report correct metrics. PR 647.
* Fix a spelling mistake in the description of E722. PR 697.
* 'pycodestyle --diff' now does not break if your 'gitconfig' enables
'mnemonicprefix'. PR 706.

- Drop support for EOL Python <2.7 and 3.2-3.3
- Check for unused exception binding in `except:` block
- Handle string literal type annotations
- Ignore redefinitions of `_`, unless originally defined by import
- Support `__class__` without `self` in Python 3
- Issue an error for `raise NotImplemented(...)`

=========================

Bug Fixes
---------

- Fixed a bug where stdout and stderr were logged twice by junitxml when a test
was marked xfail. (`3491
<https://github.com/pytest-dev/pytest/issues/3491>`_)

- Fix ``usefixtures`` mark applyed to unittest tests by correctly instantiating
``FixtureInfo``. (`3498
<https://github.com/pytest-dev/pytest/issues/3498>`_)

- Fix assertion rewriter compatibility with libraries that monkey patch
``file`` objects. (`3503
<https://github.com/pytest-dev/pytest/issues/3503>`_)


Improved Documentation
----------------------

- Added a section on how to use fixtures as factories to the fixture
documentation. (`3461 <https://github.com/pytest-dev/pytest/issues/3461>`_)


Trivial/Internal Changes
------------------------

- Enable caching for pip/pre-commit in order to reduce build time on
travis/appveyor. (`3502
<https://github.com/pytest-dev/pytest/issues/3502>`_)

- Switch pytest to the src/ layout as we already suggested it for good practice
- now we implement it as well. (`3513
<https://github.com/pytest-dev/pytest/issues/3513>`_)

- Fix if in tests to support 3.7.0b5, where a docstring handling in AST got
reverted. (`3530 <https://github.com/pytest-dev/pytest/issues/3530>`_)

- Remove some python2.5 compatibility code. (`3529
<https://github.com/pytest-dev/pytest/issues/3529>`_)

=========================

Features
--------

- Revamp the internals of the ``pytest.mark`` implementation with correct per
node handling which fixes a number of long standing bugs caused by the old
design. This introduces new ``Node.iter_markers(name)`` and
``Node.get_closest_mark(name)`` APIs. Users are **strongly encouraged** to
read the `reasons for the revamp in the docs
<https://docs.pytest.org/en/latest/mark.htmlmarker-revamp-and-iteration>`_,
or jump over to details about `updating existing code to use the new APIs
<https://docs.pytest.org/en/latest/mark.htmlupdating-code>`_. (`3317
<https://github.com/pytest-dev/pytest/issues/3317>`_)

- Now when ``pytest.fixture`` is applied more than once to the same function a
``ValueError`` is raised. This buggy behavior would cause surprising problems
and if was working for a test suite it was mostly by accident. (`2334
<https://github.com/pytest-dev/pytest/issues/2334>`_)

- Support for Python 3.7's builtin ``breakpoint()`` method, see `Using the
builtin breakpoint function
<https://docs.pytest.org/en/latest/usage.htmlbreakpoint-builtin>`_ for
details. (`3180 <https://github.com/pytest-dev/pytest/issues/3180>`_)

- ``monkeypatch`` now supports a ``context()`` function which acts as a context
manager which undoes all patching done within the ``with`` block. (`3290
<https://github.com/pytest-dev/pytest/issues/3290>`_)

- The ``--pdb`` option now causes KeyboardInterrupt to enter the debugger,
instead of stopping the test session. On python 2.7, hitting CTRL+C again
exits the debugger. On python 3.2 and higher, use CTRL+D. (`3299
<https://github.com/pytest-dev/pytest/issues/3299>`_)

- pytest not longer changes the log level of the root logger when the
``log-level`` parameter has greater numeric value than that of the level of
the root logger, which makes it play better with custom logging configuration
in user code. (`3307 <https://github.com/pytest-dev/pytest/issues/3307>`_)


Bug Fixes
---------

- A rare race-condition which might result in corrupted ``.pyc`` files on
Windows has been hopefully solved. (`3008
<https://github.com/pytest-dev/pytest/issues/3008>`_)

- Also use iter_marker for discovering the marks applying for marker
expressions from the cli to avoid the bad data from the legacy mark storage.
(`3441 <https://github.com/pytest-dev/pytest/issues/3441>`_)

- When showing diffs of failed assertions where the contents contain only
whitespace, escape them using ``repr()`` first to make it easy to spot the
differences. (`3443 <https://github.com/pytest-dev/pytest/issues/3443>`_)


Improved Documentation
----------------------

- Change documentation copyright year to a range which auto-updates itself each
time it is published. (`3303
<https://github.com/pytest-dev/pytest/issues/3303>`_)


Trivial/Internal Changes
------------------------

- ``pytest`` now depends on the `python-atomicwrites
<https://github.com/untitaker/python-atomicwrites>`_ library. (`3008
<https://github.com/pytest-dev/pytest/issues/3008>`_)

- Update all pypi.python.org URLs to pypi.org. (`3431
<https://github.com/pytest-dev/pytest/issues/3431>`_)

- Detect `pytest_` prefixed hooks using the internal plugin manager since
``pluggy`` is deprecating the ``implprefix`` argument to ``PluginManager``.
(`3487 <https://github.com/pytest-dev/pytest/issues/3487>`_)

- Import ``Mapping`` and ``Sequence`` from ``_pytest.compat`` instead of
directly from ``collections`` in ``python_api.py::approx``. Add ``Mapping``
to ``_pytest.compat``, import it from ``collections`` on python 2, but from
``collections.abc`` on Python 3 to avoid a ``DeprecationWarning`` on Python
3.7 or newer. (`3497 <https://github.com/pytest-dev/pytest/issues/3497>`_)

------------------

* Register marker to work with pytest's strict mode
* Add "official" support for Python 3.5 and 3.6

------

* Add support for the recently added ``assert_called`` method in Python 3.6 and ``mock-2.0``. Thanks `rouge8`_ for the PR (`115`_).

.. _115: https://github.com/pytest-dev/pytest-mock/pull/115