3.5.0b4

.. bpo: 23573 .. date: 9263 .. nonce: HdJPs7 .. release date: 2015-07-26 .. section: Core and Builtins

Restored optimization of bytes.rfind() and bytearray.rfind() for single-byte argument on Linux.

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.. bpo: 24569 .. date: 9262 .. nonce: bqh6PQ .. section: Core and Builtins

Make :pep:448 dictionary evaluation more consistent.

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.. bpo: 24583 .. date: 9261 .. nonce: Ooq0Tn .. section: Core and Builtins

Fix crash when set is mutated while being updated.

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.. bpo: 24407 .. date: 9260 .. nonce: GmCBB3 .. section: Core and Builtins

Fix crash when dict is mutated while being updated.

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.. bpo: 24619 .. date: 9259 .. nonce: cnfZGo .. section: Core and Builtins

New approach for tokenizing async/await. As a consequence, it is now possible to have one-line 'async def foo(): await ..' functions.

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.. bpo: 24687 .. date: 9258 .. nonce: 0UaXFe .. section: Core and Builtins

Plug refleak on SyntaxError in function parameters annotations.

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.. bpo: 15944 .. date: 9257 .. nonce: 4GuwqX .. section: Core and Builtins

memoryview: Allow arbitrary formats when casting to bytes. Patch by Martin Panter.

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.. bpo: 23441 .. date: 9256 .. nonce: JXt2Yt .. section: Library

rcompleter now prints a tab character instead of displaying possible completions for an empty word. Initial patch by Martin Sekera.

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.. bpo: 24683 .. date: 9255 .. nonce: aJdWEv .. section: Library

Fixed crashes in _json functions called with arguments of inappropriate type.

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.. bpo: 21697 .. date: 9254 .. nonce: jpATha .. section: Library

shutil.copytree() now correctly handles symbolic links that point to directories. Patch by Eduardo Seabra and Thomas Kluyver.

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.. bpo: 14373 .. date: 9253 .. nonce: Je0yDg .. section: Library

Fixed segmentation fault when gc.collect() is called during constructing lru_cache (C implementation).

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.. bpo: 24695 .. date: 9252 .. nonce: QjZzFb .. section: Library

Fix a regression in traceback.print_exception(). If exc_traceback is None we shouldn't print a traceback header like described in the documentation.

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.. bpo: 24620 .. date: 9251 .. nonce: rrnxB- .. section: Library

Random.setstate() now validates the value of state last element.

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.. bpo: 22485 .. date: 9250 .. nonce: HvJf6T .. section: Library

Fixed an issue that caused inspect.getsource to return incorrect results on nested functions.

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.. bpo: 22153 .. date: 9249 .. nonce: 6n6yld .. section: Library

Improve unittest docs. Patch from Martin Panter and evilzero.

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.. bpo: 24580 .. date: 9248 .. nonce: AGi4Gm .. section: Library

Symbolic group references to open group in re patterns now are explicitly forbidden as well as numeric group references.

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.. bpo: 24206 .. date: 9247 .. nonce: ffkVHH .. section: Library

Fixed eq and ne methods of inspect classes.

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.. bpo: 24631 .. date: 9246 .. nonce: uljPxM .. section: Library

Fixed regression in the timeit module with multiline setup.

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.. bpo: 18622 .. date: 9245 .. nonce: i6nCCW .. section: Library

unittest.mock.mock_open().reset_mock would recurse infinitely. Patch from Nicola Palumbo and Laurent De Buyst.

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.. bpo: 23661 .. date: 9244 .. nonce: 5VHJmh .. section: Library

unittest.mock side_effects can now be exceptions again. This was a regression vs Python 3.4. Patch from Ignacio Rossi

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.. bpo: 24608 .. date: 9243 .. nonce: 0TndL0 .. section: Library

chunk.Chunk.read() now always returns bytes, not str.

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.. bpo: 18684 .. date: 9242 .. nonce: S2es0F .. section: Library

Fixed reading out of the buffer in the re module.

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.. bpo: 24259 .. date: 9241 .. nonce: vMAi1A .. section: Library

tarfile now raises a ReadError if an archive is truncated inside a data segment.

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.. bpo: 15014 .. date: 9240 .. nonce: hwXwCH .. section: Library

SMTP.auth() and SMTP.login() now support RFC 4954's optional initial-response argument to the SMTP AUTH command.

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.. bpo: 24669 .. date: 9239 .. nonce: kFThK0 .. section: Library

Fix inspect.getsource() for 'async def' functions. Patch by Kai Groner.

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.. bpo: 24688 .. date: 9238 .. nonce: -yWfcO .. section: Library

ast.get_docstring() for 'async def' functions.

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.. bpo: 24603 .. date: 9237 .. nonce: PyHyF5 .. section: Build

Update Windows builds and OS X 10.5 installer to use OpenSSL 1.0.2d.