Python Examples of plistlib.dump - ProgramCreek

3.6 release Python (Part 2)

SSL session can be copied from one client-side connection to another with the new SSLSession class. TLS session resumption can speed up the initial handshake, reduce latency and improve performance (Contributed by Christian Heimes in bpo-19500 based on a draft by Alex Warhawk.)
The new get_ciphers() method can be used to get a list of enabled ciphers in order of cipher priority. All constants and flags have been converted to IntEnum and IntFlags. (Contributed by Christian Heimes in bpo-28025.)
Server and client-side specific TLS protocols for SSLContext were added. (Contributed by Christian Heimes in bpo-28085.)


A new harmonic_mean() function has been added. (Contributed by Steven D’Aprano in bpo-27181.)


struct now supports IEEE 754 half-precision floats via the 'e' format specifier. (Contributed by Eli Stevens, Mark Dickinson in bpo-11734.)


subprocess.Popen destructor now emits a ResourceWarning warning if the child process is still running. Use the context manager protocol (with proc: ...) or explicitly call the wait() method to read the exit status of the child process. (Contributed by Victor Stinner in bpo-26741.) The subprocess.Popen constructor and all functions that pass arguments through to it now accept encoding and errors arguments. Specifying either of these will enable text mode for the stdin, stdout and stderr streams. (Contributed by Steve Dower in bpo-6135.)


The new getfilesystemencodeerrors() function returns the name of the error mode used to convert between Unicode filenames and bytes filenames. (Contributed by Steve Dower in bpo-27781.) On Windows the return value of the getwindowsversion() function now includes the platform_version field which contains the accurate major version, minor version and build number of the current operating system, rather than the version that is being emulated for the process (Contributed by Steve Dower in bpo-27932.)


Telnet is now a context manager (contributed by Stéphane Wirtel in bpo-25485). time
The struct_time attributes tm_gmtoff and tm_zone are now available on all platforms. timeit
The new Timer.autorange() convenience method has been added to call Timer.timeit() repeatedly so that the total run time is greater or equal to 200 milliseconds. (Contributed by Steven D’Aprano in bpo-6422.)
timeit now warns when there is substantial (4x) variance between best and worst times. (Contributed by Serhiy Storchaka in bpo-23552.)


Added methods trace_add(), trace_remove() and trace_info() in the tkinter.Variable class. They replace old methods trace_variable(), trace(), trace_vdelete() and trace_vinfo() that use obsolete Tcl commands and might not work in future versions of Tcl. (Contributed by Serhiy Storchaka in bpo-22115).


Both the traceback module and the interpreter’s builtin exception display now abbreviate long sequences of repeated lines in tracebacks as shown in the following example:
def f(): f()...>>> f()Traceback (most recent call last):
File "", line 1, in
File "", line 1, in f
File "", line 1, in f
File "", line 1, in f [Previous line repeated 995 more times]RecursionError:
maximum recursion depth exceeded (Contributed by Emanuel Barry in bpo-26823.) tracemalloc The tracemalloc module now supports tracing memory allocations in multiple different address spaces. The new DomainFilter filter class has been added to filter block traces by their address space (domain). (Contributed by Victor Stinner in bpo-26588.) typing Since the typing module is provisional, all changes introduced in Python 3.6 have also been backported to Python 3.5.x. The typing module has a much improved support for generic type aliases. For example Dict[str, Tuple[S, T]] is now a valid type annotation. (Contributed by Guido van Rossum in Github #195.) The typing.ContextManager class has been added for representing contextlib.AbstractContextManager. (Contributed by Brett Cannon in bpo-25609.) The typing.Collection class has been added for representing (Contributed by Ivan Levkivskyi in bpo-27598.) The typing.ClassVar type construct has been added to mark class variables. As introduced in PEP 526, a variable annotation wrapped in ClassVar indicates that a given attribute is intended to be used as a class variable and should not be set on instances of that class. (Contributed by Ivan Levkivskyi in Github #280.) A new TYPE_CHECKING constant that is assumed to be True by the static type chekers, but is False at runtime. (Contributed by Guido van Rossum in Github #230.) A new NewType() helper function has been added to create lightweight distinct types for annotations:
from typing import NewType
UserId = NewType('UserId', int)some_id = UserId(524313) The static type checker will treat the new type as if it were a subclass of the original type. (Contributed by Ivan Levkivskyi in Github #189.) unicodedata The unicodedata module now uses data from Unicode 9.0.0. (Contributed by Benjamin Peterson.) unittest.mock The Mock class has the following improvements: Two new methods, Mock.assert_called() and Mock.assert_called_once() to check if the mock object was called. (Contributed by Amit Saha in bpo-26323.) The Mock.reset_mock() method now has two optional keyword only arguments: return_value and side_effect. (Contributed by Kushal Das in bpo-21271.) urllib.request If a HTTP request has a file or iterable body (other than a bytes object) but no Content-Length header, rather than throwing an error, AbstractHTTPHandler now falls back to use chunked transfer encoding. (Contributed by Demian Brecht and Rolf Krahl in bpo-12319.) urllib.robotparser RobotFileParser now supports the Crawl-delay and Request-rate extensions. (Contributed by Nikolay Bogoychev in bpo-16099.) venv venv accepts a new parameter --prompt. This parameter provides an alternative prefix for the virtual environment. (Proposed by Łukasz Balcerzak and ported to 3.6 by Stéphane Wirtel in bpo-22829.) warnings A new optional source parameter has been added to the warnings.warn_explicit() function: the destroyed object which emitted a ResourceWarning. A source attribute has also been added to warnings.WarningMessage (contributed by Victor Stinner in bpo-26568 and bpo-26567). When a ResourceWarning warning is logged, the tracemalloc module is now used to try to retrieve the traceback where the destroyed object was allocated. Example with the script
import warnings
def func():
return open(__file__) 
f = func()f = None Output of the command python3.6 -Wd -X tracemalloc=5 ResourceWarning: unclosed file <_io.TextIOWrapper
name='' mode='r' encoding='UTF-8'>
f = NoneObject allocated at (most recent call first):
File "", lineno 4
return open(__file__) 
File "", lineno 6
f = func() 
The “Object allocated at” traceback is new and is only displayed if tracemalloc is tracing Python memory allocations and if the warnings module was already imported.


Added the 64-bit integer type REG_QWORD. (Contributed by Clement Rouault in bpo-23026.)


Allowed keyword arguments to be passed to Beep, MessageBeep, and PlaySound (bpo-27982). xmlrpc.client
The xmlrpc.client module now supports unmarshalling additional data types used by the Apache XML-RPC implementation for numerics and None. (Contributed by Serhiy Storchaka in bpo-26885.) zipfile
A new ZipInfo.from_file() class method allows making a ZipInfo instance from a filesystem file. A new ZipInfo.is_dir() method can be used to check if the ZipInfo instance represents a directory. (Contributed by Thomas Kluyver in bpo-26039.)
The method can now be used to write data into a ZIP file, as well as for extracting data. (Contributed by Thomas Kluyver in bpo-26039.)


The compress() and decompress() functions now accept keyword arguments. (Contributed by Aviv Palivoda in bpo-26243 and Xiang Zhang in bpo-16764 respectively.)


  • The Python interpreter now uses a 16-bit wordcode instead of bytecode which made a number of opcode optimizations possible. (Contributed by Demur Rumed with input and reviews from Serhiy Storchaka and Victor Stinner in bpo-26647 and bpo-28050.)
  • The asyncio.Future class now has an optimized C implementation. (Contributed by Yury Selivanov and INADA Naoki in bpo-26081.)
  • The asyncio.Task class now has an optimized C implementation. (Contributed by Yury Selivanov in bpo-28544.)
  • Various implementation improvements in the typing module (such as caching of generic types) allow up to 30 times performance improvements and reduced memory footprint.
  • The ASCII decoder is now up to 60 times as fast for error handlers surrogateescape, ignore and replace (Contributed by Victor Stinner in bpo-24870).
  • The ASCII and the Latin1 encoders are now up to 3 times as fast for the error handler surrogateescape (Contributed by Victor Stinner in bpo-25227).
  • The UTF-8 encoder is now up to 75 times as fast for error handlers ignore, replace, surrogateescape, surrogatepass (Contributed by Victor Stinner in bpo-25267).
  • The UTF-8 decoder is now up to 15 times as fast for error handlers ignore, replace and surrogateescape (Contributed by Victor Stinner in bpo-25301).
  • bytes % args is now up to 2 times faster. (Contributed by Victor Stinner in bpo-25349). bytearray % args is now between 2.5 and 5 times faster. (Contributed by Victor Stinner in bpo-25399).
  • Optimize bytes.fromhex() and bytearray.fromhex(): they are now between 2x and 3.5x faster. (Contributed by Victor Stinner in bpo-25401).
  • Optimize bytes.replace(b'', b'.') and bytearray.replace(b'', b'.'): up to 80% faster. (Contributed by Josh Snider in bpo-26574).
  • Allocator functions of the PyMem_Malloc() domain (PYMEM_DOMAIN_MEM) now use the pymalloc memory allocator instead of malloc() function of the C library. The pymalloc allocator is optimized for objects smaller or equal to 512 bytes with a short lifetime, and use malloc() for larger memory blocks. (Contributed by Victor Stinner in bpo-26249).
  • pickle.load() and pickle.loads() are now up to 10% faster when deserializing many small objects (Contributed by Victor Stinner in bpo-27056).
  • Passing keyword arguments to a function has an overhead in comparison with passing positional arguments. Now in extension functions implemented with using Argument Clinic this overhead is significantly decreased. (Contributed by Serhiy Storchaka in bpo-27574).
  • Optimized glob() and iglob() functions in the glob module; they are now about 3–6 times faster. (Contributed by Serhiy Storchaka in bpo-25596).
  • Optimized globbing in pathlib by using os.scandir(); it is now about 1.5–4 times faster. (Contributed by Serhiy Storchaka in bpo-26032).
  • xml.etree.ElementTree parsing, iteration and deepcopy performance has been significantly improved. (Contributed by Serhiy Storchaka in bpo-25638, bpo-25873, and bpo-25869.)
  • Creation of fractions.Fraction instances from floats and decimals is now 2 to 3 times faster. (Contributed by Serhiy Storchaka in bpo-25971.)

Build and C API Changes

Python now requires some C99 support in the toolchain to build. Most notably, Python now uses standard integer types and macros in place of custom macros like PY_LONG_LONG. For more information, see PEP 7 and bpo-17884.
Cross-compiling CPython with the Android NDK and the Android API level set to 21 (Android 5.0 Lollilop) or greater runs successfully. While Android is not yet a supported platform, the Python test suite runs on the Android emulator with only about 16 tests failures. See the Android meta-issue bpo-26865.
The --enable-optimizations configure flag has been added. Turning it on will activate expensive optimizations like PGO. (Original patch by Alecsandru Patrascu of Intel in bpo-26359.)
The GIL must now be held when allocator functions of PYMEM_DOMAIN_OBJ (ex: PyObject_Malloc()) and PYMEM_DOMAIN_MEM (ex: PyMem_Malloc()) domains are called.
New Py_FinalizeEx() API which indicates if flushing buffered data failed. (Contributed by Martin Panter in bpo-5319.)
PyArg_ParseTupleAndKeywords() now supports positional-only parameters. Positional-only parameters are defined by empty names. (Contributed by Serhiy Storchaka in bpo-26282). PyTraceback_Print method now abbreviates long sequences of repeated lines as "[Previous line repeated {count} more times]". (Contributed by Emanuel Barry in bpo-26823.)
The new PyErr_SetImportErrorSubclass() function allows for specifying a subclass of ImportError to raise. (Contributed by Eric Snow in bpo-15767.)
The new PyErr_ResourceWarning() function can be used to generate a ResourceWarning providing the source of the resource allocation. (Contributed by Victor Stinner in bpo-26567.)
The new PyOS_FSPath() function returns the file system representation of a path-like object. (Contributed by Brett Cannon in bpo-27186.)
The PyUnicode_FSConverter() and PyUnicode_FSDecoder() functions will now accept path-like objects.
The PyExc_RecursionErrorInst singleton that was part of the public API has been removed as its members being never cleared may cause a segfault during finalization of the interpreter. Contributed by Xavier de Gaye in bpo-22898 and bpo-30697.

Other Improvements

When --version (short form: -V) is supplied twice, Python prints sys.version for detailed information.
$ ./python -VVPython 3.6.0b4+ (3.6:223967b49e49+, Nov 21 2016, 20:55:04)[GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.42.1)]


New Keywords

async and await are not recommended to be used as variable, class, function or module names. Introduced by PEP 492 in Python 3.5, they will become proper keywords in Python 3.7. Starting in Python 3.6, the use of async or await as names will generate a DeprecationWarning.

Deprecated Python behavior

Raising the StopIteration exception inside a generator will now generate a DeprecationWarning, and will trigger a RuntimeError in Python 3.7. See PEP 479: Change StopIteration handling inside generators for details.
The aiter() method is now expected to return an asynchronous iterator directly instead of returning an awaitable as previously. Doing the former will trigger a DeprecationWarning. Backward compatibility will be removed in Python 3.7. (Contributed by Yury Selivanov in bpo-27243.)
A backslash-character pair that is not a valid escape sequence now generates a DeprecationWarning. Although this will eventually become a SyntaxError, that will not be for several Python releases. (Contributed by Emanuel Barry in bpo-27364.)
When performing a relative import, falling back on name and path from the calling module when spec or package are not defined now raises an ImportWarning. (Contributed by Rose Ames in bpo-25791.)
Deprecated Python modules, functions and methods


The asynchat has been deprecated in favor of asyncio. (Contributed by Mariatta in bpo-25002.)


The asyncore has been deprecated in favor of asyncio. (Contributed by Mariatta in bpo-25002.)


Unlike other dbm implementations, the dbm.dumb module creates databases with the 'rw' mode and allows modifying the database opened with the 'r' mode. This behavior is now deprecated and will be removed in 3.8. (Contributed by Serhiy Storchaka in bpo-21708.)


The undocumented extra_path argument to the Distribution constructor is now considered deprecated and will raise a warning if set. Support for this parameter will be removed in a future Python release. See bpo-27919 for details.


The support of non-integer arguments in getgrgid() has been deprecated. (Contributed by Serhiy Storchaka in bpo-26129.)


The importlib.machinery.SourceFileLoader.load_module() and importlib.machinery.SourcelessFileLoader.load_module() methods are now deprecated. They were the only remaining implementations of in importlib that had not been deprecated in previous versions of Python in favour of
The importlib.machinery.WindowsRegistryFinder class is now deprecated. As of 3.6.0, it is still added to sys.meta_path by default (on Windows), but this may change in future releases.


Undocumented support of general bytes-like objects as paths in os functions, compile() and similar functions is now deprecated. (Contributed by Serhiy Storchaka in bpo-25791 and bpo-26754.)


Support for inline flags (?letters) in the middle of the regular expression has been deprecated and will be removed in a future Python version. Flags at the start of a regular expression are still allowed. (Contributed by Serhiy Storchaka in bpo-22493.)


OpenSSL 0.9.8, 1.0.0 and 1.0.1 are deprecated and no longer supported. In the future the ssl module will require at least OpenSSL 1.0.2 or 1.1.0.
SSL-related arguments like certfile, keyfile and check_hostname in ftplib, http.client, imaplib, poplib, and smtplib have been deprecated in favor of context. (Contributed by Christian Heimes in bpo-28022.)
A couple of protocols and functions of the ssl module are now deprecated. Some features will no longer be available in future versions of OpenSSL. Other features are deprecated in favor of a different API. (Contributed by Christian Heimes in bpo-28022 and bpo-26470.)


The tkinter.tix module is now deprecated. tkinter users should use tkinter.ttk instead.


The pyvenv script has been deprecated in favour of python3 -m venv. This prevents confusion as to what Python interpreter pyvenv is connected to and thus what Python interpreter will be used by the virtual environment. (Contributed by Brett Cannon in bpo-25154.)

Deprecated functions and types of the C API

Undocumented functions PyUnicode_AsEncodedObject(), PyUnicode_AsDecodedObject(), PyUnicode_AsEncodedUnicode() and PyUnicode_AsDecodedUnicode() are deprecated now. Use the generic codec based API instead.

Deprecated Build Options

The --with-system-ffi configure flag is now on by default on non-macOS UNIX platforms. It may be disabled by using --without-system-ffi, but using the flag is deprecated and will not be accepted in Python 3.7. macOS is unaffected by this change. Note that many OS distributors already use the --with-system-ffi flag when building their system Python.


API and Feature Removals

  • Unknown escapes consisting of '\' and an ASCII letter in regular expressions will now cause an error. In replacement templates for re.sub() they are still allowed, but deprecated. The re.LOCALE flag can now only be used with binary patterns.
  • inspect.getmoduleinfo() was removed (was deprecated since CPython 3.3). inspect.getmodulename() should be used for obtaining the module name for a given path. (Contributed by Yury Selivanov in bpo-13248.)
  • traceback.Ignore class and traceback.usage, traceback.modname, traceback.fullmodname, traceback.find_lines_from_code, traceback.find_lines, traceback.find_strings,
  • traceback.find_executable_lines methods were removed from the traceback module. They were undocumented methods deprecated since Python 3.2 and equivalent functionality is available from private methods.
  • The tk_menuBar() and tk_bindForTraversal() dummy methods in tkinter widget classes were removed (corresponding Tk commands were obsolete since Tk 4.0).
  • The open() method of the zipfile.ZipFile class no longer supports the 'U' mode (was deprecated since Python 3.4). Use io.TextIOWrapper for reading compressed text files in universal newlines mode.
  • The undocumented IN, CDROM, DLFCN, TYPES, CDIO, and STROPTS modules have been removed.
  • They had been available in the platform specific Lib/plat-*/ directories, but were chronically out of date, inconsistently available across platforms, and unmaintained. The script that created these modules is still available in the source distribution at Tools/scripts/
*The deprecated asynchat.fifo class has been removed.

Porting to Python 3.6

  • This section lists previously described changes and other bugfixes that may require changes to your code.

Changes in ‘python’ Command Behavior

8 The output of a special Python build with defined COUNT_ALLOCS, SHOW_ALLOC_COUNT or SHOW_TRACK_COUNT macros is now off by default. It can be re-enabled using the -X showalloccount option. It now outputs to stderr instead of stdout. (Contributed by Serhiy Storchaka in bpo-23034.)

Changes in the Python API

  • open() will no longer allow combining the 'U' mode flag with '+'. (Contributed by Jeff Balogh and John O’Connor in bpo-2091.)
  • sqlite3 no longer implicitly commits an open transaction before DDL statements.
  • On Linux, os.urandom() now blocks until the system urandom entropy pool is initialized to increase the security.
  • When is defined, must also be defined.
  • PyErr_SetImportError() now sets TypeError when its msg argument is not set. Previously only NULL was returned.
  • The format of the co_lnotab attribute of code objects changed to support a negative line number delta. By default, Python does not emit bytecode with a negative line number delta. Functions using frame.f_lineno, PyFrame_GetLineNumber() or PyCode_Addr2Line() are not affected. Functions directly decoding co_lnotab should be updated to use a signed 8-bit integer type for the line number delta, but this is only required to support applications using a negative line number delta. See Objects/lnotab_notes.txt for the co_lnotab format and how to decode it, and see the PEP 511 for the rationale.
  • The functions in the compileall module now return booleans instead of 1 or 0 to represent success or failure, respectively. Thanks to booleans being a subclass of integers, this should only be an issue if you were doing identity checks for 1 or 0. See bpo-25768.
  • Reading the port attribute of urllib.parse.urlsplit() and urlparse() results now raises ValueError for out-of-range values, rather than returning None. See bpo-20059.
  • The imp module now raises a DeprecationWarning instead of PendingDeprecationWarning.
  • The following modules have had missing APIs added to their all attributes to match the documented APIs: calendar, cgi, csv, ElementTree, enum, fileinput, ftplib, logging, mailbox, mimetypes, optparse, plistlib, smtpd, subprocess, tarfile, threading and wave. This means they will export new symbols when import * is used. (Contributed by Joel Taddei and Jacek Kołodziej in bpo-23883.)
  • When performing a relative import, if package does not compare equal to spec.parent then ImportWarning is raised. (Contributed by Brett Cannon in bpo-25791.)
  • When a relative import is performed and no parent package is known, then ImportError will be raised. Previously, SystemError could be raised. (Contributed by Brett Cannon in bpo-18018.)
  • Servers based on the socketserver module, including those defined in http.server, xmlrpc.server and wsgiref.simple_server, now only catch exceptions derived from Exception. Therefore if a request handler raises an exception like SystemExit or KeyboardInterrupt, handle_error() is no longer called, and the exception will stop a single-threaded server. (Contributed by Martin Panter in bpo-23430.)
  • spwd.getspnam() now raises a PermissionError instead of KeyError if the user doesn’t have privileges.
  • The socket.socket.close() method now raises an exception if an error (e.g. EBADF) was reported by the underlying system call. (Contributed by Martin Panter in bpo-26685.)
  • The decode_data argument for the smtpd.SMTPChannel and smtpd.SMTPServer constructors is now False by default. This means that the argument passed to process_message() is now a bytes object by default, and process_message() will be passed keyword arguments. Code that has already been updated in accordance with the deprecation warning generated by 3.5 will not be affected.
  • All optional arguments of the dump(), dumps(), load() and loads() functions and JSONEncoder and JSONDecoder class constructors in the json module are now keyword-only. (Contributed by Serhiy Storchaka in bpo-18726.)
  • Subclasses of type which don’t override may no longer use the one-argument form to get the type of an object.
  • As part of PEP 487, the handling of keyword arguments passed to type (other than the metaclass hint, metaclass) is now consistently delegated to object.init_subclass(). This means that and type.init() both now accept arbitrary keyword arguments, but object.init_subclass() (which is called from will reject them by default. Custom metaclasses accepting additional keyword arguments will need to adjust their calls to (whether direct or via super) accordingly.
  • In distutils.command.sdist.sdist, the default_format attribute has been removed and is no longer honored. Instead, the gzipped tarfile format is the default on all platforms and no platform-specific selection is made. In environments where distributions are built on Windows and zip distributions are required, configure the project with a setup.cfg file containing the following:
This behavior has also been backported to earlier Python versions by Setuptools 26.0.0.
  • In the urllib.request module and the http.client.HTTPConnection.request() method, if no Content-Length header field has been specified and the request body is a file object, it is now sent with HTTP 1.1 chunked encoding. If a file object has to be sent to a HTTP 1.0 server, the Content-Length value now has to be specified by the caller. (Contributed by Demian Brecht and Rolf Krahl with tweaks from Martin Panter in bpo-12319.)
  • The DictReader now returns rows of type OrderedDict. (Contributed by Steve Holden in bpo-27842.)
  • The crypt.METHOD_CRYPT will no longer be added to crypt.methods if unsupported by the platform. (Contributed by Victor Stinner in bpo-25287.)
  • The verbose and rename arguments for namedtuple() are now keyword-only. (Contributed by Raymond Hettinger in bpo-25628.)
  • On Linux, ctypes.util.find_library() now looks in LD_LIBRARY_PATH for shared libraries. (Contributed by Vinay Sajip in bpo-9998.)
  • The imaplib.IMAP4 class now handles flags containing the ']' character in messages sent from the server to improve real-world compatibility. (Contributed by Lita Cho in bpo-21815.)
  • The mmap.write() function now returns the number of bytes written like other write methods. (Contributed by Jakub Stasiak in bpo-26335.)
  • The pkgutil.iter_modules() and pkgutil.walk_packages() functions now return ModuleInfo named tuples. (Contributed by Ramchandra Apte in bpo-17211.)
  • re.sub() now raises an error for invalid numerical group references in replacement templates even if the pattern is not found in the string. The error message for invalid group references now includes the group index and the position of the reference. (Contributed by SilentGhost, Serhiy Storchaka in bpo-25953.)
  • zipfile.ZipFile will now raise NotImplementedError for unrecognized compression values. Previously a plain RuntimeError was raised. Additionally, calling ZipFile methods on a closed ZipFile or calling the write() method on a ZipFile created with mode 'r' will raise a ValueError. Previously, a RuntimeError was raised in those scenarios.
  • when custom metaclasses are combined with zero-argument super() or direct references from methods to the implicit class closure variable, the implicit classcell namespace entry must now be passed up to for initialisation. Failing to do so will result in a DeprecationWarning in 3.6 and a RuntimeWarning in the future.

Changes in the C API

The PyMem_Malloc() allocator family now uses the pymalloc allocator rather than the system malloc(). Applications calling PyMem_Malloc() without holding the GIL can now crash. Set the PYTHONMALLOC environment variable to debug to validate the usage of memory allocators in your application. See bpo-26249.
Py_Exit() (and the main interpreter) now override the exit status with 120 if flushing buffered data failed. See bpo-5319.

CPython bytecode changes

There have been several major changes to the bytecode in Python 3.6. The Python interpreter now uses a 16-bit wordcode instead of bytecode. (Contributed by Demur Rumed with input and reviews from Serhiy Storchaka and Victor Stinner in bpo-26647 and bpo-28050.)
The new FORMAT_VALUE and BUILD_STRING opcodes as part of the formatted string literal implementation. (Contributed by Eric Smith in bpo-25483 and Serhiy Storchaka in bpo-27078.) The new BUILD_CONST_KEY_MAP opcode to optimize the creation of dictionaries with constant keys. (Contributed by Serhiy Storchaka in bpo-27140.)
The function call opcodes have been heavily reworked for better performance and simpler implementation. The MAKE_FUNCTION, CALL_FUNCTION, CALL_FUNCTION_KW and BUILD_MAP_UNPACK_WITH_CALL opcodes have been modified, the new CALL_FUNCTION_EX and BUILD_TUPLE_UNPACK_WITH_CALL have been added, and CALL_FUNCTION_VAR, CALL_FUNCTION_VAR_KW and MAKE_CLOSURE opcodes have been removed. (Contributed by Demur Rumed in bpo-27095, and Serhiy Storchaka in bpo-27213, bpo-28257.)
The new SETUP_ANNOTATIONS and STORE_ANNOTATION opcodes have been added to support the new variable annotation syntax. (Contributed by Ivan Levkivskyi in bpo-27985.)

Notable changes in Python 3.6.2

New make regen-all build target

To simplify cross-compilation, and to ensure that CPython can reliably be compiled without requiring an existing version of Python to already be available, the autotools-based build system no longer attempts to implicitly recompile generated files based on file modification times.
Instead, a new make regen-all command has been added to force regeneration of these files when desired (e.g. after an initial version of Python has already been built based on the pregenerated versions).
More selective regeneration targets are also defined - see for details.
New in version 3.6.2.

Removal of make touch build target

The make touch build target previously used to request implicit regeneration of generated files by updating their modification times has been removed. It has been replaced by the new make regen-all target.
Changed in version 3.6.2.

Notable changes in Python 3.6.5

The locale.localeconv() function now sets temporarily the LC_CTYPE locale to the LC_NUMERIC locale in some cases.

End of the Document

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The following are 30 code examples for showing how to use plistlib.dump().These examples are extracted from open source projects. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. The following are 30 code examples for showing how to use plistlib.writePlist().These examples are extracted from open source projects. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. The options are the same options documented above for the ... including names given by the --add-binary option; datas: non-binary files included in the app, including names given by the --add-data option. An instance of class PYZ is a .pyz archive (described under Inspecting Archives below), which contains all the Python modules from a.pure. An instance of EXE is built from the analyzed ... The binary plist format seems like a good choice. Unfortunately plistlib doesn't do binary files, so step right up PyObjC. (Segue: I'm very open to any other thoughts on how to accomplish live search. I already pared down the data as much as possible, including only displaying enough results to fill the window with the iPhone keyboard up, which is 5.) ... >>> d = plistlib.dumps({'a': 18446744073709551615}, fmt=plistlib.FMT_BINARY) >>> plistlib.loads(d) {'a': -1} My patch did this correct (as 128-bit integer), and as you can see the produced file is accepted by Apple's plutil. msg208159 - Author: Ronald Oussoren (ronaldoussoren) * Date: 2014-01-15 13:21; However, I have no idea how to write that file using Apple's APIs. I'd prefer to either be ... Read and write binary .plist files. This module is a drop-in enhancement of the plistlib module in the standard libary. There are two different APIs which are roughly equivalent. The legacy API provides an interface very similar to that of plistlib, and allows for the use of this module in code already written to use plistlib. The standard API ... I final step of the Python 3 Virtualenv + Binary installation instructions fails. Any thoughts as to why this is failing? `(labelImg-c78H3X17) labelImg git:(master) python py2app -A running py2app Traceback (most recent call... Issue #14455: plistlib now supports binary plists and has an updated API. This patch adds support for binary plists on OSX to plistlib (based on a patch by 'dpounces'). Tuesday, 11 July 2017. Plistlib Binary Options [issue14455] plistlib unable to read json and binary plist files [issue14455] plistlib unable to read json and binary plist files [issue14455] plistlib unable to read json and binary plist files

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Python Basics - 28 part 1 - Check if Specific Words Exist ...

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