macOS

• bpo-38117 [https://bugs.python.org/issue?@action=redirect&bpo=38117]: Updated OpenSSL to 1.1.1d in macOS installer.

• bpo-38089 [https://bugs.python.org/issue?@action=redirect&bpo=38089]: Move Azure Pipelines to latest VM versions and make macOS tests optional

• bpo-18049 [https://bugs.python.org/issue?@action=redirect&bpo=18049]: Increase the default stack size of threads from 5MB to 16MB on macOS, to match the stack size of the main thread. This avoids crashes on deep recursion in threads.

• bpo-34602 [https://bugs.python.org/issue?@action=redirect&bpo=34602]: Avoid test suite failures on macOS by no longer calling resource.setrlimit to increase the process stack size limit at runtime. The runtime change is no longer needed since the interpreter is being built with a larger default stack size.

• bpo-35360 [https://bugs.python.org/issue?@action=redirect&bpo=35360]: Update macOS installer to use SQLite 3.28.0.

• bpo-34631 [https://bugs.python.org/issue?@action=redirect&bpo=34631]: Updated OpenSSL to 1.1.1c in macOS installer.

IDLE

• bpo-26353 [https://bugs.python.org/issue?@action=redirect&bpo=26353]: Stop adding newline when saving an IDLE shell window.

• bpo-4630 [https://bugs.python.org/issue?@action=redirect&bpo=4630]: Add an option to toggle IDLE's cursor blink for shell, editor, and output windows. See Settings, General, Window Preferences, Cursor Blink. Patch by Zackery Spytz.

• bpo-38598 [https://bugs.python.org/issue?@action=redirect&bpo=38598]: Do not try to compile IDLE shell or output windows

• bpo-36698 [https://bugs.python.org/issue?@action=redirect&bpo=36698]: IDLE no longer fails when write non-encodable characters to stderr. It now escapes them with a backslash, as the regular Python interpreter. Added the errors field to the standard streams.

• bpo-35379 [https://bugs.python.org/issue?@action=redirect&bpo=35379]: When exiting IDLE, catch any AttributeError. One happens when EditorWindow.close is called twice. Printing a traceback, when IDLE is run from a terminal, is useless and annoying.

• bpo-38183 [https://bugs.python.org/issue?@action=redirect&bpo=38183]: To avoid problems, test_idle ignores the user config directory. It no longer tries to create or access .idlerc or any files within. Users must run IDLE to discover problems with saving settings.

• bpo-38077 [https://bugs.python.org/issue?@action=redirect&bpo=38077]: IDLE no longer adds 'argv' to the user namespace when initializing it. This bug only affected 3.7.4 and 3.8.0b2 to 3.8.0b4.

• bpo-38041 [https://bugs.python.org/issue?@action=redirect&bpo=38041]: Shell restart lines now fill the window width, always start with '=', and avoid wrapping unnecessarily. The line will still wrap if the included file name is long relative to the width.

• bpo-35771 [https://bugs.python.org/issue?@action=redirect&bpo=35771]: To avoid occasional spurious test_idle failures on slower machines, increase the hover_delay in test_tooltip.

• bpo-37824 [https://bugs.python.org/issue?@action=redirect&bpo=37824]: Properly handle user input warnings in IDLE shell. Cease turning SyntaxWarnings into SyntaxErrors.

• bpo-37929 [https://bugs.python.org/issue?@action=redirect&bpo=37929]: IDLE Settings dialog now closes properly when there is no shell window.

• bpo-37902 [https://bugs.python.org/issue?@action=redirect&bpo=37902]: Add mousewheel scrolling for IDLE module, path, and stack browsers. Patch by George Zhang.

• bpo-37849 [https://bugs.python.org/issue?@action=redirect&bpo=37849]: Fixed completions list appearing too high or low when shown above the current line.

• bpo-36419 [https://bugs.python.org/issue?@action=redirect&bpo=36419]: Refactor IDLE autocomplete and improve testing.

• bpo-37748 [https://bugs.python.org/issue?@action=redirect&bpo=37748]: Reorder the Run menu. Put the most common choice, Run Module, at the top.

• bpo-37692 [https://bugs.python.org/issue?@action=redirect&bpo=37692]: Improve highlight config sample with example shell interaction and better labels for shell elements.

• bpo-37628 [https://bugs.python.org/issue?@action=redirect&bpo=37628]: Settings dialog no longer expands with font size.

• bpo-37627 [https://bugs.python.org/issue?@action=redirect&bpo=37627]: Initialize the Customize Run dialog with the command line arguments most recently entered before. The user can optionally edit before submitting them.

• bpo-33610 [https://bugs.python.org/issue?@action=redirect&bpo=33610]: Fix code context not showing the correct context when first toggled on.

• bpo-37530 [https://bugs.python.org/issue?@action=redirect&bpo=37530]: Optimize code context to reduce unneeded background activity. Font and highlight changes now occur along with text changes instead of after a random delay.

• bpo-27452 [https://bugs.python.org/issue?@action=redirect&bpo=27452]: Cleanup config.py by inlining RemoveFile and simplifying the handling of file in CreateConfigHandlers.

• bpo-37325 [https://bugs.python.org/issue?@action=redirect&bpo=37325]: Fix tab focus traversal order for help source and custom run dialogs.

• bpo-37321 [https://bugs.python.org/issue?@action=redirect&bpo=37321]: Both subprocess connection error messages now refer to the 'Startup failure' section of the IDLE doc.

• bpo-17535 [https://bugs.python.org/issue?@action=redirect&bpo=17535]: Add optional line numbers for IDLE editor windows. Windows open without line numbers unless set otherwise in the General tab of the configuration dialog.

• bpo-26806 [https://bugs.python.org/issue?@action=redirect&bpo=26806]: To compensate for stack frames added by IDLE and avoid possible problems with low recursion limits, add 30 to limits in the user code execution process. Subtract 30 when reporting recursion limits to make this addition mostly transparent.

• bpo-37177 [https://bugs.python.org/issue?@action=redirect&bpo=37177]: Properly 'attach' search dialogs to their main window so that they behave like other dialogs and do not get hidden behind their main window.

• bpo-37039 [https://bugs.python.org/issue?@action=redirect&bpo=37039]: Adjust "Zoom Height" to individual screens by momentarily maximizing the window on first use with a particular screen. Changing screen settings may invalidate the saved height. While a window is maximized, "Zoom Height" has no effect.

• bpo-35763 [https://bugs.python.org/issue?@action=redirect&bpo=35763]: Make calltip reminder about '/' meaning positional-only less obtrusive by only adding it when there is room on the first line.

• bpo-5680 [https://bugs.python.org/issue?@action=redirect&bpo=5680]: Add 'Run… Customized' to the Run menu to run a module with customized settings. Any 'command line arguments' entered are added to sys.argv. One can suppress the normal Shell main module restart.

• bpo-36390 [https://bugs.python.org/issue?@action=redirect&bpo=36390]: Gather Format menu functions into format.py. Combine paragraph.py, rstrip.py, and format methods from editor.py.

工具/示例

• bpo-38118 [https://bugs.python.org/issue?@action=redirect&bpo=38118]: Update Valgrind suppression file to ignore a false alarm in PyUnicode_Decode() when using GCC builtin strcmp().

• bpo-38347 [https://bugs.python.org/issue?@action=redirect&bpo=38347]: pathfix.py: Assume all files that end on '.py' are Python scripts when working recursively.

• bpo-37803 [https://bugs.python.org/issue?@action=redirect&bpo=37803]: pdb's --help and --version long options now work.

• bpo-37942 [https://bugs.python.org/issue?@action=redirect&bpo=37942]: Improve ArgumentClinic converter for floats.

• bpo-37704 [https://bugs.python.org/issue?@action=redirect&bpo=37704]: Remove Tools/scripts/h2py.py: use cffi to access a C API in Python.

• bpo-37675 [https://bugs.python.org/issue?@action=redirect&bpo=37675]: 2to3 now works when run from a zipped standard library.

• bpo-37034 [https://bugs.python.org/issue?@action=redirect&bpo=37034]: Argument Clinic now uses the argument name on errors with keyword-only argument instead of their position. Patch contributed by Rémi Lapeyre.

• bpo-37064 [https://bugs.python.org/issue?@action=redirect&bpo=37064]: Add option -k to pathscript.py script: preserve shebang flags. Add option -a to pathscript.py script: add flags.

C API

• bpo-37633 [https://bugs.python.org/issue?@action=redirect&bpo=37633]: Reexport some function compatibility wrappers for macros in pythonrun.h.

• bpo-38644 [https://bugs.python.org/issue?@action=redirect&bpo=38644]: Provide Py_EnterRecursiveCall() and Py_LeaveRecursiveCall() as regular functions for the limited API. Previously, there were defined as macros, but these macros didn't work with the limited API which cannot access PyThreadState.recursion_depth field. Remove PyCheckRecursionLimit from the stable ABI.

• bpo-38650 [https://bugs.python.org/issue?@action=redirect&bpo=38650]: The global variable PyStructSequence_UnnamedField is now a constant and refers to a constant string.

• bpo-38540 [https://bugs.python.org/issue?@action=redirect&bpo=38540]: Fixed possible leak in PyArg_Parse() and similar functions for format units "es#" and "et#" when the macro PY_SSIZE_T_CLEAN is not defined.

• bpo-38395 [https://bugs.python.org/issue?@action=redirect&bpo=38395]: Fix a crash in weakref.proxy objects due to incorrect lifetime management when calling some associated methods that may delete the last reference to object being referenced by the proxy. Patch by Pablo Galindo.

• bpo-36389 [https://bugs.python.org/issue?@action=redirect&bpo=36389]: The PyObjectCheckConsistency() function is now also available in release mode. For example, it can be used to debug a crash in the visit_decref() function of the GC.

• bpo-38266 [https://bugs.python.org/issue?@action=redirect&bpo=38266]: Revert the removal of PyThreadState_DeleteCurrent() with documentation.

• bpo-38303 [https://bugs.python.org/issue?@action=redirect&bpo=38303]: Update audioop extension module to use the stable ABI (PEP-384). Patch by Tyler Kieft.

• bpo-38234 [https://bugs.python.org/issue?@action=redirect&bpo=38234]: Py_SetPath() now sets sys.executable to the program full path (Py_GetProgramFullPath()) rather than to the program name (Py_GetProgramName()).

• bpo-38234 [https://bugs.python.org/issue?@action=redirect&bpo=38234]: Python ignored arguments passed to Py_SetPath(), Py_SetPythonHome() and Py_SetProgramName(): fix Python initialization to use specified arguments.

• bpo-38205 [https://bugs.python.org/issue?@action=redirect&bpo=38205]: The Py_UNREACHABLE() macro now calls Py_FatalError().

• bpo-38140 [https://bugs.python.org/issue?@action=redirect&bpo=38140]: Make dict and weakref offsets opaque for C heap types by passing the offsets through PyMemberDef

• bpo-15088 [https://bugs.python.org/issue?@action=redirect&bpo=15088]: The C function PyGen_NeedsFinalizing has been removed. It was not documented, tested or used anywhere within CPython after the implementation of PEP 442 [https://peps.python.org/pep-0442/]. Patch by Joannah Nanjekye. (Patch by Joannah Nanjekye)

• bpo-36763 [https://bugs.python.org/issue?@action=redirect&bpo=36763]: Options added by PySys_AddXOption() are now handled the same way than PyConfig.xoptions and command line -X options.

• bpo-37926 [https://bugs.python.org/issue?@action=redirect&bpo=37926]: Fix a crash in PySys_SetArgvEx(0, NULL, 0).

• bpo-37879 [https://bugs.python.org/issue?@action=redirect&bpo=37879]: Fix subtype_dealloc to suppress the type decref when the base type is a C heap type

• bpo-37645 [https://bugs.python.org/issue?@action=redirect&bpo=37645]: Add PyObjectFunctionStr() to get a user-friendly string representation of a function-like object. Patch by Jeroen Demeyer.

• bpo-29548 [https://bugs.python.org/issue?@action=redirect&bpo=29548]: The functions PyEval_CallObject, PyEval_CallFunction, PyEval_CallMethod and PyEval_CallObjectWithKeywords are deprecated. Use PyObject_Call() and its variants instead.

• bpo-37151 [https://bugs.python.org/issue?@action=redirect&bpo=37151]: PyCFunction_Call is now a deprecated alias of PyObject_Call().

• bpo-37540 [https://bugs.python.org/issue?@action=redirect&bpo=37540]: The vectorcall protocol now requires that the caller passes only strings as keyword names.

• bpo-37207 [https://bugs.python.org/issue?@action=redirect&bpo=37207]: The vectorcall protocol is now enabled for type objects: set tp_vectorcall to a vectorcall function to be used instead of tp_new and tp_init when calling the class itself.

• bpo-21120 [https://bugs.python.org/issue?@action=redirect&bpo=21120]: Exclude Python-ast.h, ast.h and asdl.h from the limited API.

• bpo-37483 [https://bugs.python.org/issue?@action=redirect&bpo=37483]: Add new function PyObjectCallOneArg for calling an object with one positional argument.

• bpo-36763 [https://bugs.python.org/issue?@action=redirect&bpo=36763]: Add PyConfig_SetWideStringList() function.

• bpo-37337 [https://bugs.python.org/issue?@action=redirect&bpo=37337]: Add fast functions for calling methods: PyObjectVectorcallMethod(), PyObjectCallMethodNoArgs() and PyObjectCallMethodOneArg().

• bpo-28805 [https://bugs.python.org/issue?@action=redirect&bpo=28805]: The METH_FASTCALL calling convention has been documented.

• bpo-37221 [https://bugs.python.org/issue?@action=redirect&bpo=37221]: The new function PyCode_NewWithPosOnlyArgs() allows to create code objects like PyCode_New(), but with an extra posonlyargcount parameter for indicating the number of positonal-only arguments.

• bpo-37215 [https://bugs.python.org/issue?@action=redirect&bpo=37215]: Fix dtrace issue introduce by bpo-36842 [https://bugs.python.org/issue?@action=redirect&bpo=36842]

• bpo-37194 [https://bugs.python.org/issue?@action=redirect&bpo=37194]: Add a new public PyObject_CallNoArgs() function to the C API: call a callable Python object without any arguments. It is the most efficient way to call a callback without any argument. On x86-64, for example, PyObject_CallFunctionObjArgs(func, NULL) allocates 960 bytes on the stack per call, whereas PyObject_CallNoArgs(func) only allocates 624 bytes per call.

• bpo-37170 [https://bugs.python.org/issue?@action=redirect&bpo=37170]: Fix the cast on error in PyLong_AsUnsignedLongLongMask().

• bpo-35381 [https://bugs.python.org/issue?@action=redirect&bpo=35381]: Convert posixmodule.c statically allocated types DirEntryType and ScandirIteratorType to heap-allocated types.

• bpo-34331 [https://bugs.python.org/issue?@action=redirect&bpo=34331]: Use singular/plural noun in error message when instantiating an abstract class with non-overridden abstract method(s).

Python 3.8.0 beta 1

发布日期: 2019-06-04

安全性

• bpo-35907 [https://bugs.python.org/issue?@action=redirect&bpo=35907]: CVE 2019-9948 [https://www.cve.org/CVERecord?id=CVE-2019-9948]: Avoid file reading by disallowing local-file:// and local_file:// URL schemes in URLopener().open() and URLopener().retrieve() of urllib.request.

• bpo-33529 [https://bugs.python.org/issue?@action=redirect&bpo=33529]: Prevent fold function used in email header encoding from entering infinite loop when there are too many nonASCII characters in a header.

• bpo-33164 [https://bugs.python.org/issue?@action=redirect&bpo=33164]: Updated blake2 implementation which uses secure memset implementation provided by platform.

核心与内置函数

• bpo-35814 [https://bugs.python.org/issue?@action=redirect&bpo=35814]: Allow unpacking in the right hand side of annotated assignments. In particular, t: Tuple[int, …] = x, y, *z is now allowed.

• bpo-37126 [https://bugs.python.org/issue?@action=redirect&bpo=37126]: All structseq objects are now tracked by the garbage collector. Patch by Pablo Galindo.

• bpo-37122 [https://bugs.python.org/issue?@action=redirect&bpo=37122]: Make the co_argcount attribute of code objects represent the total number of positional arguments (including positional-only arguments). The value of co_posonlyargcount can be used to distinguish which arguments are positional only, and the difference (co_argcount - co_posonlyargcount) is the number of positional-or-keyword arguments. Patch by Pablo Galindo.

• bpo-20092 [https://bugs.python.org/issue?@action=redirect&bpo=20092]: Constructors of int, float and complex will now use the __index__() special method, if available and the corresponding method __int__(), __float__() or __complex__() is not available.

• bpo-37087 [https://bugs.python.org/issue?@action=redirect&bpo=37087]: Add native thread ID (TID) support to OpenBSD.

• bpo-26219 [https://bugs.python.org/issue?@action=redirect&bpo=26219]: Implemented per opcode cache mechanism and LOAD_GLOBAL instruction use it. LOAD_GLOBAL is now about 40% faster. Contributed by Yury Selivanov, and Inada Naoki.

• bpo-37072 [https://bugs.python.org/issue?@action=redirect&bpo=37072]: Fix crash in PyAST_FromNodeObject() when flags is NULL.

• bpo-37029 [https://bugs.python.org/issue?@action=redirect&bpo=37029]: Freeing a great many small objects could take time quadratic in the number of arenas, due to using linear search to keep obmalloc.c's list of usable arenas sorted by order of number of free memory pools. This is accomplished without search now, leaving the worst-case time linear in the number of arenas. For programs where this quite visibly matters (typically with more than 100 thousand small objects alive simultaneously), this can greatly reduce the time needed to release their memory.

• bpo-26423 [https://bugs.python.org/issue?@action=redirect&bpo=26423]: Fix possible overflow in wrap_lenfunc() when sizeof(long) < sizeof(Py_ssize_t) (e.g., 64-bit Windows).

• bpo-37050 [https://bugs.python.org/issue?@action=redirect&bpo=37050]: Improve the AST for "debug" fstrings, which use '=' to print out the source of the expression being evaluated. Delete expr_text from the FormattedValue node, and instead use a Constant string node (possibly merged with adjacent constant expressions inside the fstring).

• bpo-22385 [https://bugs.python.org/issue?@action=redirect&bpo=22385]: The bytes.hex, bytearray.hex, and memoryview.hex methods as well as the binascii.hexlify and b2a_hex functions now have the ability to include an optional separator between hex bytes. This functionality was inspired by MicroPython's hexlify implementation.

• bpo-26836 [https://bugs.python.org/issue?@action=redirect&bpo=26836]: Add os.memfd_create().

• bpo-37032 [https://bugs.python.org/issue?@action=redirect&bpo=37032]: Added new replace() method to the code type (types.CodeType).

• bpo-37007 [https://bugs.python.org/issue?@action=redirect&bpo=37007]: Implement socket.if_nameindex(), socket.if_nametoindex(), and socket.if_indextoname() on Windows.

• bpo-36829 [https://bugs.python.org/issue?@action=redirect&bpo=36829]: PyErr_WriteUnraisable() now creates a traceback object if there is no current traceback. Moreover, call PyErr_NormalizeException() and PyException_SetTraceback() to normalize the exception value. Ignore any error.

• bpo-36878 [https://bugs.python.org/issue?@action=redirect&bpo=36878]: Only accept text after # type: ignore if the first character is ASCII. This is to disallow things like # type: ignoreé.

• bpo-36878 [https://bugs.python.org/issue?@action=redirect&bpo=36878]: Store text appearing after a # type: ignore comment in the AST. For example a type ignore like # type: ignore[E1000] will have the string "[E1000]" stored in its AST node.

• bpo-2180 [https://bugs.python.org/issue?@action=redirect&bpo=2180]: Treat line continuation at EOF as a SyntaxError by Anthony Sottile.

• bpo-36907 [https://bugs.python.org/issue?@action=redirect&bpo=36907]: Fix a crash when calling a C function with a keyword dict (f(**kwargs)) and changing the dict kwargs while that function is running.

• bpo-36946 [https://bugs.python.org/issue?@action=redirect&bpo=36946]: Fix possible signed integer overflow when handling slices.

• bpo-36826 [https://bugs.python.org/issue?@action=redirect&bpo=36826]: Add NamedExpression kind support to ast_unparse.c

• bpo-1875 [https://bugs.python.org/issue?@action=redirect&bpo=1875]: A SyntaxError is now raised if a code blocks that will be optimized away (e.g. if conditions that are always false) contains syntax errors. Patch by Pablo Galindo.

• bpo-36027 [https://bugs.python.org/issue?@action=redirect&bpo=36027]: Allow computation of modular inverses via three-argument pow: the second argument is now permitted to be negative in the case where the first and third arguments are relatively prime.

• bpo-36861 [https://bugs.python.org/issue?@action=redirect&bpo=36861]: Update the Unicode database to version 12.1.0.

• bpo-28866 [https://bugs.python.org/issue?@action=redirect&bpo=28866]: Avoid caching attributes of classes which type defines mro() to avoid a hard cache invalidation problem.

• bpo-36851 [https://bugs.python.org/issue?@action=redirect&bpo=36851]: The FrameType stack is now correctly cleaned up if the execution ends with a return and the stack is not empty.

• bpo-34616 [https://bugs.python.org/issue?@action=redirect&bpo=34616]: The compile() builtin functions now support the ast.PyCF_ALLOW_TOP_LEVEL_AWAIT flag, which allow to compile sources that contains toplevel await, async with or async for. This is useful to evaluate async-code from with an already async functions; for example in a custom REPL.

• bpo-36842 [https://bugs.python.org/issue?@action=redirect&bpo=36842]: Implement PEP 578, adding sys.audit, io.open_code and related APIs.

• bpo-27639 [https://bugs.python.org/issue?@action=redirect&bpo=27639]: Correct return type for UserList slicing operations. Patch by Michael Blahay, Erick Cervantes, and vaultah

• bpo-36737 [https://bugs.python.org/issue?@action=redirect&bpo=36737]: Move PyRuntimeState.warnings into per-interpreter state (via "module state").

• bpo-36793 [https://bugs.python.org/issue?@action=redirect&bpo=36793]: Removed __str__ implementations from builtin types bool, int, float, complex and few classes from the standard library. They now inherit __str__() from object.

• bpo-36817 [https://bugs.python.org/issue?@action=redirect&bpo=36817]: Add a = feature fstrings for debugging. This can precede !s, !r, or !a. It produces the text of the expression, followed by an equal sign, followed by the repr of the value of the expression. So f'{3*9+15=}' would be equal to the string '3*9+15=42'. If = is specified, the default conversion is set to !r, unless a format spec is given, in which case the formatting behavior is unchanged, and format will be used.

• bpo-24048 [https://bugs.python.org/issue?@action=redirect&bpo=24048]: Save the live exception during import.c's remove_module().

• bpo-27987 [https://bugs.python.org/issue?@action=redirect&bpo=27987]: pymalloc returns memory blocks aligned by 16 bytes, instead of 8 bytes, on 64-bit platforms to conform x86-64 ABI. Recent compilers assume this alignment more often. Patch by Inada Naoki.

• bpo-36601 [https://bugs.python.org/issue?@action=redirect&bpo=36601]: A long-since-meaningless check for getpid() == main_pid was removed from Python's internal C signal handler.

• bpo-36594 [https://bugs.python.org/issue?@action=redirect&bpo=36594]: Fix incorrect use of %p in format strings. Patch by Zackery Spytz.

• bpo-36045 [https://bugs.python.org/issue?@action=redirect&bpo=36045]: builtins.help() now prefixes async for async functions.

• bpo-36084 [https://bugs.python.org/issue?@action=redirect&bpo=36084]: Add native thread ID (TID) to threading.Thread objects (supported platforms: Windows, FreeBSD, Linux, macOS)

• bpo-36035 [https://bugs.python.org/issue?@action=redirect&bpo=36035]: Added fix for broken symlinks in combination with pathlib

• bpo-35983 [https://bugs.python.org/issue?@action=redirect&bpo=35983]: Added new trashcan macros to deal with a double deallocation that could occur when the tp_dealloc of a subclass calls the tp_dealloc of a base class and that base class uses the trashcan mechanism. Patch by Jeroen Demeyer.

• bpo-20602 [https://bugs.python.org/issue?@action=redirect&bpo=20602]: Do not clear sys.flags and sys.float_info during shutdown. Patch by Zackery Spytz.

• bpo-26826 [https://bugs.python.org/issue?@action=redirect&bpo=26826]: Expose copy_file_range() as a low level API in the os module.

• bpo-32388 [https://bugs.python.org/issue?@action=redirect&bpo=32388]: Remove cross-version binary compatibility requirement in tp_flags.

• bpo-31862 [https://bugs.python.org/issue?@action=redirect&bpo=31862]: Port binascii to PEP 489 multiphase initialization. Patch by Marcel Plch.