Core and Builtins

• Issue #6707: dir() on an uninitialized module caused a crash.
• Issue #6540: Fixed crash for bytearray.translate() with invalid parameters.
• Issue #6573: set.union() stopped processing inputs if an instance of self occurred in the argument chain.
• Issue #6070: On posix platforms import no longer copies the execute bit from the .py file to the .pyc file if it is set.
• Issue #6428: Since Python 3.0, the __bool__ method must return a bool object, and not an int. Fix the corresponding error message, and the documentation.
• Issue #6347: Include inttypes.h as well as stdint.h in pyport.h. This fixes a build failure on HP-UX: int32_t and uint32_t are defined in inttypes.h instead of stdint.h on that platform.
• Issue #6373: Fixed a SystemError when encoding with the latin-1 codec and the 'surrogateescape' error handler, a string which contains unpaired surrogates.

C-API

• Issue #6624: yArg_ParseTuple with "s" format when parsing argument with NUL: Bogus TypeError detail string.
• Issue #6405: Remove duplicate type declarations in descrobject.h.
• The code flags for old __future__ features are now available again.

Library

• Issue #6106: telnetlib.Telnet.process_rawq doesn't handle default WILL/WONT DO/DONT correctly.
• Issue #6126: Fixed pdb command-line usage.
• Issue #6629: Fix a data corruption issue in the new I/O library, which could occur when writing to a BufferedRandom object (e.g. a file opened in "rb+" or "wb+" mode) after having buffered a certain amount of data for reading. This bug was not present in the pure Python implementation.
• Issue #6622: Fix "local variable 'secret' referenced before assignment" bug in POP3.apop.
• Issue #6637: defaultdict.copy() did not work when the default factory was left unspecified. Also, the eval/repr round-trip would fail when the default_factory was None.
• Issue #2715: Remove remnants of Carbon.File from binhex module.
• Issue #6595: The Decimal constructor now allows arbitrary Unicode decimal digits in input, as recommended by the standard. Previously it was restricted to accepting [0-9].
• Issues #5155, #5313, #5331: multiprocessing.Process._bootstrap was unconditionally calling "os.close(sys.stdin.fileno())" resulting in file descriptor errors
• Issue #1424152: Fix for http.client, urllib.request to support SSL while working through proxy. Original patch by Christopher Li, changes made by Senthil Kumaran
• importlib.abc.PyLoader did not inherit from importlib.abc.ResourceLoader like the documentation said it did even though the code in PyLoader relied on the abstract method required by ResourceLoader.
• Issue #6431: Make Fraction type return NotImplemented when it doesn't know how to handle a comparison without loss of precision. Also add correct handling of infinities and nans for comparisons with float.
• Issue #6415: Fixed warnings.warn segfault on bad formatted string.
• Issue #6358: The exit status of a command started with os.popen() was reported differently than it did with python 2.x.
• Issue #6323: The pdb debugger did not exit when running a script with a syntax error.
• Issue #3392: The subprocess communicate() method no longer fails in select() when file descriptors are large; communicate() now uses poll() when possible.
• Issue #6369: Fix an RLE decompression bug in the binhex module.
• Issue #6344: Fixed a crash of mmap.read() when passed a negative argument.
• Issue #4005: Fixed a crash of pydoc when there was a zip file present in sys.path.

Extension Modules

• Fix a segfault in expat.
• Issue #4509: array.array objects are no longer modified after an operation failing due to the resize restriction in-place when the object has exported buffers.

Build

• Issue 4601: 'make install' did not set the appropriate permissions on directories.
• Issue 5390: Add uninstall icon independent of whether file extensions are installed.

Test

• Fix a test in importlib.test.source.test_abc_loader that was incorrectly testing when a .pyc file lacked an code object bytecode.