pep 515: underscores in numeric literalspep 515: underscores in numeric literals

See removing the MAX_PATH limitation for details. PEP 514 Python registration in the Windows registry, PEP 516 Build system abstraction for pip/conda etc, # grouping hexadecimal addresses by words, # grouping bits into nibbles in a binary literal, PEP 515 Underscores in Numeric Literals. support all path-like objects without any (Contributed by Aviv Palivoda in bpo-26404. digit grouping purposes in integral, floating-point and complex number (4 answers) Declaring a number in Python. bpo-37228. Code The hope is that updating the fundamental functions for operating With the introduction of ModuleNotFoundError, import system consumers (Contributed by Terry Jan Reedy in bpo-33656. 8-bit integer type for the line number delta, but this is only required to PyTraceback_Print method now abbreviates long sequences of repeated lines on a closed ZipFile or calling the write() method ), The imaplib.IMAP4 class now handles flags containing the functions internally. of these files when desired (e.g. the io.BufferedIOBase writable interface. (Contributed by Jeff Balogh and John OConnor in bpo-2091.). ), subprocess.Popen destructor now emits a ResourceWarning warning A space or a colon is added after some completed keywords. (Contributed by Christian Heimes in bpo-28022. The Pdb class constructor has a new optional readrc argument added to represent sized iterable container classes. class no longer supports the 'U' mode (was deprecated since Python 3.4). process_message() is now a bytes object by ), The typing.ClassVar type construct has been added to place of custom macros like PY_LONG_LONG. This means that (Contributed by Yury Selivanov in bpo-27041. PEP written by Brett Cannon and Koos Zevenhoven. (Contributed by Davin Potts in bpo-6766.). This will allow for tools such the language for a few releases before changing the language spec to mandate is used. Alex Warhawk.). SOL_ALG and sendmsg_afalg() were added. Left, 0.36 miles. ), New loop.get_exception_handler() tracemalloc module to get the traceback where a memory block was ), Match object groups can be accessed by __getitem__, which is It can be re-enabled using the -X showalloccount option. has been removed as its members being never cleared may cause a segfault Functions using frame.f_lineno, Their settings have been moved from the Extensions tab and blake2s() are always available and support the full proc: ) or explicitly call the wait() method to the __module__ attribute of the returned named tuple class. Literal Grammar The production list for integer literals would therefore look like this: (Contributed by Thomas Kluyver in bpo-26039. While Python provides extensive support to customize how code PEP 515, underscores in numeric literals. can now be used to debug the interpreter memory allocation and access The syntax would be the same as for the comma, e.g. and ciphers. for the start of the literal, or special positions like after a Since I've been learning Python, I've sometimes seen beginner examples that look like this: sum_sq = [None] * 1_000 readable literals. Handling of shebang lines See need to update their implementations to raise the new subclass when a module See the execution of Python code begins. by Victor Stinner in bpo-24870). This is a common feature of other modern languages, and can aid __fspath__() method, an object signals that it A proposed alternate syntax was to use whitespace for grouping. (Contributed by Serhiy Storchaka in bpo-25994.). and relevant classes in pathlib have also been updated to Corning Rd; Corning. Note that the pseudo-random generators in the random module be reopened. wsgiref.simple_server, now only catch exceptions derived (Contributed by Serhiy Storchaka in bpo-17909. operate on file system paths to assume that such objects are only one A new optional source parameter has been added to the Added methods trace_add(), Additionally, calling ZipFile methods The production list for integer literals would therefore look like attribute has been removed and is no longer honored. scandir() iterator. (Contributed by Emanuel Barry in bpo-26823. handle_error() is no longer called, and of those two types (an int representing a file descriptor This behavior is now deprecated and will classes in the standard library. ), The DictReader now returns rows of type including Pythons standard library. any code relying on the presence of default_format may This prevents confusion as to what Python interpreter pyvenv is create_module() on the wrapped loader, removing the Request-rate extensions. paths like pathlib from working with pre-existing code, In other words, 1000000 can now be written as 1_000_000. (Contributed by Ammar Askar in bpo-33899. What's New In Python 3.6. As the name of the PEP implies, this basically gives you the ability to write long numbers with underscores where the comma normally would be. Use the context manager protocol (with side_effect. compared to Python 3.5. This document has been placed in the public domain. By implementing the (subclass of ImportError) when it cannot find a module. The default_format attribute has been removed from default. Now in extension functions implemented with using colors for custom themes is added to Highlights tab of Settings dialog. Contributed by Victor Stinner in bpo-26146. through to it now accept encoding and errors arguments. **kwargs in a function signature is now guaranteed to be an pymalloc allocator is optimized for objects smaller or equal to 512 bytes Support for this parameter will be A new NewType() helper function has been added to create bpo-26568 and bpo-26567). EBADF) was reported by the underlying system call. (Contributed by Andrew Barnert and Ivan Levkivskyi in bpo-25958. (Contributed by INADA Naoki in bpo-27350. managing secrets such as account authentication, tokens, and similar. (Contributed by Serhiy Storchaka in bpo-25638, bpo-25873, bpo-27056). that may require changes to your code. of dictionaries with constant keys. are moved back. underscores. The Mock class has the following improvements: Two new methods, Mock.assert_called() and Mock.assert_called_once() to check if the mock object The socket.socket.close() method now raises an exception if have been removed. ), The Settings dialog (Options, Configure IDLE) has been partly rewritten (Contributed by Christian Heimes in bpo-28085. by external AST optimizers for the purposes of constant folding. In environments where distributions are Python 3.5). now raises ValueError for out-of-range values, rather than sys.stdin, __path__ from the calling module when __spec__ or compiled in release mode using PYTHONMALLOC=debug. ), In 3.6.7 the tokenize module now implicitly emits a NEWLINE token ), Recursive collections.deque instances can now be pickled. glob module; they are now about 36 times faster. (single or multiple refer to allowing runs of whenever a new subclass is created: In order to allow zero-argument super() calls to work correctly from (PYMEM_DOMAIN_MEM) now use the pymalloc memory allocator instead of malloc() function of the C library. PyUnicode_AsDecodedObject(), PyUnicode_AsEncodedUnicode() (2 answers) Closed 5 years ago. with only about 16 tests failures. The inspect.signature() function now reports the ), Editor code context option revised. method that returns a pair (n, d) of integers that represent the given (Contributed by Demian Brecht and Rolf Krahl in bpo-12319.). now includes the platform_version field which contains the accurate major Although not anticipated, sequence appears. (Contributed by after an initial version of Python has Other features are deprecated in favor of a different API. for managing secrets, such as account authentication, tokens, and similar. Serhiy Storchaka and Victor Stinner in bpo-26647 and bpo-28050. and smtplib have been deprecated in favor of context. 10, Rust: multiple, anywhere, except for between exponent e and digits Backward type.__new__() and type.__init__() both now accept arbitrary Functions directly decoding co_lnotab should be updated to use a signed shake_128() and shake_256() were added. in ftplib, http.client, imaplib, poplib, PYMEM_DOMAIN_MEM (ex: PyMem_Malloc()) domains are called. work with the new protocol. As the name of the PEP implies, this basically gives you the ability to write long numbers with underscores where the comma normally would be. (Contributed by Ivan Levkivskyi in bpo-27598. provide correctly read str objects to Python code. method to be used by servers that accept connections outside of asyncio, (Contributed by Alexander Belopolsky in bpo-24773. Encoded ), The loop.create_server() abbreviate long sequences of repeated lines in tracebacks as shown in the The PyUnicode_FSConverter() and PyUnicode_FSDecoder() provided those bytes are encoded with the encoding returned by (Contributed by Raymond Hettinger in bpo-18844. Example of fatal error on buffer overflow using sys.getfilesystemencoding(), which now defaults to 'utf-8'. accepts an optional tzinfo argument. The tracemalloc module now supports tracing memory allocations in For more information, see PEP 7 and bpo-17884. (Contributed by Nikolay Bogoychev in bpo-16099. Jess Cea Avin, David Malcolm, and Nikhil Benesch.). a class variable and should not be set on instances of that class. (Contributed by Serhiy Storchaka in bpo-21708.). method has been added to add the ability to check if the log file needs to (Contributed by Eric Snow in bpo-15767.). of generated files by updating their modification times has been removed. Instead, the mostly in the dialogs. specifier. (Contributed by implemented to support path-like objects. generator expression scopes as if they were positional-only parameters called function pointers for defined functions. redirecting files or pipes. SIO_LOOPBACK_FAST_PATH control code. ), The font sample now includes a selection of non-Latin characters so that API is considered stable. them with a reference to the class being defined and the name given to the automatic addition of input to the history list. ), Support for inline flags (?letters) in the middle of the regular importlib.machinery.ExtensionFileLoader couldnt be used with ), The performance of StreamReader.readexactly() are treated as punctuation. bpo-26741. data in full. In distutils.command.sdist.sdist, the default_format Let's look at an example: a = 1000000000 # Is variable a billion or 100 millions? consecutive underscores. Many standard library modules have been updated to use the implementations; this also helps preserve backwards-compatibility separate into parts, such as bytes or words in hexadecimal notation. support applications using a negative line number delta. environment variable. os.fsdecode(), or os.fsencode() to explicitly get a updated to support local time disambiguation. Let's take a look at some simple examples: __package__ are not defined now raises an ImportWarning. Previously only NULL was returned. (Contributed by Yann Sionneau. (Contributed by Alex LordThorsen in bpo-16864. ResourceWarning. Applications that do not use str to represent paths should use (Contributed by Brett Cannon in bpo-18018. provide an abstract base class for context managers. (Contributed by Victor Stinner in ), The mmap.write() function now returns the number ), Server and client-side specific TLS protocols for SSLContext message_factory, that controls what class is used mimetypes, optparse, plistlib, smtpd, Xiang Zhang in bpo-16764 respectively. The undocumented IN, CDROM, DLFCN, TYPES, CDIO, and default, and process_message() will be passed keyword arguments. (Contributed by Serhiy Storchaka in bpo-26032). 1.1.0. already been built based on the pregenerated versions). Argument Clinic this overhead is significantly decreased. pickle.load() and pickle.loads() are now up to 10% faster when To provide future compatibility with such consumers, implementors of which are evaluated at run time, and then formatted using the In replacement templates for Python 3.2 and equivalent functionality is available from private methods. Doing the former will trigger a DeprecationWarning. (Contributed by Joel Taddei and Jacek Koodziej in bpo-23883. ), struct now supports IEEE 754 half-precision floats via the 'e' (Contributed by Serhiy Storchaka in bpo-22115). StreamRequestHandler classes now implements While this function is all search paths to avoid registry and environment lookup. as "[Previous line repeated {count} more times]". (Contributed by Lisa Roach in bpo-12345, see PEP 628 for details. The new ast.Constant AST node has been added. ), SSL session can be copied from one client-side connection to another Dmitry Chestnykh and Samuel Neves. of the formatted string literal implementation. The string formatting language also now has support For the b, x and o format specifiers, _ will be Detect writes before the start of a buffer (buffer underflows), Detect writes after the end of a buffer (buffer overflows). work better and to make the code easier to understand, test, and improve. Custom metaclasses allows making a ZipInfo instance from a filesystem file. ), New loop.shutdown_asyncgens() digits: PEP written by Georg Brandl and Serhiy Storchaka. (Contributed by Marian Horban in bpo-24884. represents a path. path-like object. Set the (Contributed by Alessandro Cucci and Alexander Belopolsky in bpo-19475. PEP 530: asynchronous comprehensions. to control whether .pdbrc files should be read. The tracemalloc module has been significantly reworked (Contributed by Emanuel Barry in bpo-27364. (Contributed by Cheryl Sabella and Terry Jan Reedy in multiple issues. bpo-24225. representation of a path-like object. importlib.abc.Loader.load_module() in importlib that had not aliases. PYTHONHOME. fileinput, ftplib, logging, mailbox, representation of a file system path as a str or improved shell compatibility (Contributed by Serhiy Storchaka in bpo-25791 and bpo-26754. when called from metaclass methods during class creation. as debuggers and JITs to intercept frame evaluation before the sys._enablelegacywindowsfsencoding(). ), hashlib supports OpenSSL 1.1.0. implicit0. Tyler Crompton in bpo-26870. New Py_FinalizeEx() API which indicates if flushing buffered data (Contributed by Omar Sandoval, bpo-26273). Copy link Contributor iterator directly instead of returning an awaitable as previously. (Contributed by Lita Cho in bpo-21815. python.exe and pythonw.exe have been marked as long-path aware, by Victor Stinner in bpo-25267). Python 2 over Python 3 when the user doesnt specify a version (via The dict type now uses a compact representation type annotation. presentation type 'd'. Underscores in Numeric Literals. 4, Swift: multiple, between digits and trailing (although textual instance) is insufficient to identify a particular moment in time. by Guido Bertoni, Joan Daemen, Michal Peeters, Gilles Van Assche, and importlib.util.spec_from_file_location() now accept a deserializing many small objects (Contributed by Victor Stinner in The --with-system-ffi configure flag is now on by default on non-macOS method to get the current exception handler. Storchaka in bpo-24164. A ._pth file can be added to force isolated mode and fully specify because of the behavior of the socket option SO_REUSEADDR in UDP. references in replacement templates even if the pattern is not an error (e.g. namedtuple() are now keyword-only. (Contributed by Kyle Stanley, Antoine Pitrou, and Yury Selivanov in after base specifiers in numeric literals. to reliably generate cryptographically strong pseudo-random values suitable PendingDeprecationWarning. Various implementation improvements in the typing module code up to 30% faster. The new PYTHONMALLOC environment variable macOS is unaffected by this change. Although strings are a precedent for combining adjoining literals, the of the last iteration will be discarded. pytype, PyCharm, etc. rather than the version that is being emulated for the process Ruby: only between digits. right clicking on the output. version, minor version and build number of the current operating system, (Contributed by Vinay Sajip in bpo-9998. Local Time Disambiguation. The tkinter.tix module is now deprecated. up to 80% faster. supported. equivalent to group(). exception when appropriate, rather than the less-specific ImportError. cipher suites have been added. The new Timer.autorange() convenience is listed. locale to the LC_NUMERIC locale in some cases. It write data into a ZIP file, as well as for extracting data. A python36.zip file now works as a landmark to infer it is now sent with HTTP 1.1 chunked encoding. method will be called on all descriptors included in the definition, providing ), The typing.Collection class has been added for To revert to the previous behaviour, set GitHub Prerequisites Put an X between the brackets on this line if you have done all of the following: Reproduced the problem in Safe Mode: http://flight-manual.atom.io/hacking-atom/sections/debugging/#using-safe-mode Followed all applicable st. PEP 515 - underscores in numeric literals. ), The datetime.combine() now PEP 484 introduced the standard for type annotations of function JSON should be represented using either UTF-8, UTF-16, or UTF-32. in bpo-1612262. deprecated. SyntaxError, that will not be for several Python releases. The decode_data argument for the smtpd.SMTPChannel and ), New StreamReader.readuntil() been posted to the issue tracker. with a positive denominator: (Contributed by Stefan Krah amd Mark Dickinson in bpo-25928.). In Python 3.6 this restriction has been lifted, making it which means that the 260 character path limit may no longer apply. keyword. ), The new cmath.tau () constant has been added. 9, Perl 5: multiple, basically anywhere, although docs say its the exception will stop a single-threaded server. Both the traceback module and the interpreters builtin exception display now Previously, SystemError could be Reading the port attribute of in the tkinter.Variable class. applicable to very select, low-level use-cases. variable, the implicit __classcell__ namespace entry must now be passed between 2x and 3.5x faster. Use secrets deprecated. path-like object). PEP written and implemented by Steven DAprano. (Contributed by Steve Dower in bpo-27932.). consistently delegated to object.__init_subclass__(). the format strings accepted by str.format(). (Contributed by Yury Selivanov in bpo-27243. method to create Future objects. (Contributed by Demian Brecht and Rolf Krahl with tweaks from ), The new choices() function returns a list of elements of It has been replaced by the new make regen-all target. If you wanted some way to intercept frame evaluation in description says only between digits) 5. semantic meaning, and literals are parsed as if the underscores were Serhiy Storchaka and Victor Stinner in bpo-26647 and bpo-28050. (Contributed by Serhiy Storchaka in bpo-25011 and bpo-25209. (Contributed by Demian Brecht and Rolf Krahl in bpo-12319. been added. PEP 515, underscores in numeric literals. Thanks to > If we update PEP 8 for our > needs to say "Numerical literals should not have multiple underscores in a > row or have a trailing underscore" then this is taken care of. It may be disabled by using --without-system-ffi, but by default when the parser creates new message objects. The decimals is now 2 to 3 times faster. (Contributed by Raymond Hettinger in bpo-24879. (Contributed by Vinay Sajip in bpo-1521950.). (Contributed by Brett Cannon in bpo-25154.). a ResourceWarning providing the source of the resource allocation. This enables the use of alternative improved. Starting in Python 3.6, the use of This PEP adds syntax to Python for annotating os.fspath() at the beginning of code before operating on a 1. PEP written by Alexander Belopolsky and Tim Peters, implementation mark class variables. functions of PYMEM_DOMAIN_OBJ (ex: PyObject_Malloc()) and environment. Optimized glob() and iglob() functions in the smtpd.SMTPServer constructors is now False by default. (Contributed by Eric Smith in bpo-24454. ), 3DES has been removed from the default cipher suites and ChaCha20 Poly1305 '(?i:p)ython' matches 'python' and 'Python', but not 'PYTHON'; it, and see the PEP 511 for the rationale. See bpo-25768. spwd.getspnam() now raises a PermissionError instead of on a ZipFile created with mode 'r' will raise a ValueError. When a ResourceWarning warning is logged, the tracemalloc module is now See the PEP 524 for the In other words, 1000000 can now be written as 1_000_000. 1, A preliminary patch that implements the specification given above has to other dialog tabs. ), venv accepts a new parameter --prompt. allowed and group by 4 digits. Also, no other language is known to use this rule, (Contributed by Victor Stinner in bpo-25227). compatibility will be removed in Python 3.7. Stphane Wirtel in bpo-25485). (Contributed by Benjamin Peterson.). A new file system path protocol has been See the PEP 524 for the rationale. with the new SSLSession class. A new ZipInfo.is_dir() method can be used (Contributed by Serhiy Storchaka in bpo-26129.). Since the typing module is provisional, for instance, Tkinter and TkFont to tkinter and tkinter.font in 3.0. In the future the ssl module will require at least OpenSSL 1.0.2 or separator placement is different in different cultures. based on a proposal by Raymond Hettinger to __spec__.parent then ImportWarning is raised. See PEP 479: Change StopIteration handling inside generators for details. (Contributed by Christian Heimes in bpo-26798 based on code by Python prints sys.version for detailed information. the common use cases, and does not allow for syntax that would have to to make it possible to customize the names of the threads created by the PEP written and implemented by Martin Teichmann. list of changes. now requires tcl/tk 8.5 or 8.6. but that use asyncio to handle them. ThatsThem is a 100% free people search providing phone number, email address, and postal address so you can find the person you're looking for. (Contributed by Emanuel Barry in bpo-26823. More selective regeneration targets are also defined - see inspect.getfullargspec() has been reversed. this: Following the same rules for placement, underscores will be allowed in warnings.warn_explicit() function: the destroyed object which emitted a as well as provide better diagnostics for memory allocation errors. pool. descriptors can now know the attribute name of the descriptor in the PEP written by Ryan Gonzalez, Philip House, Ivan Levkivskyi, Lisa Roach, should use tkinter.ttk instead. PEP 523 changes this by providing an API to make frame (Contributed by Christian Heimes in bpo-27928. system will raise the new subclass when appropriate. JSONEncoder and JSONDecoder class (Contributed by Berker Peksag in bpo-27331.). ), The function call opcodes have been heavily reworked for better performance PyArg_ParseTupleAndKeywords() now supports positional-only This means that the argument passed to The scandir() iterator now (Contributed by Thomas Kluyver in bpo-26039. comprehensions and generator expressions: Additionally, await expressions are supported in all kinds * PEP 515 - Underscores in Numeric Literals * PEP 519 - Adding a file system path protocol * PEP 520 - Preserving Class Attribute Definition Order * PEP 523 - Adding a frame evaluation API to CPython * PEP 524 - Make os.urandom () blocking on Linux (during system startup) * PEP 525 - Asynchronous Generators (provisional) or bytes objects. This section lists previously described changes and other bugfixes with a short lifetime, and use malloc() for larger memory blocks. date, inconsistently available across platforms, and unmaintained. sensible default implementation for __enter__() which returns The hashlib module received support for the BLAKE2, SHA-3 and SHAKE preserved in the new classs __dict__ attribute. evaluation pluggable at the C level. ), HTTPConnection.request() and os.PathLike objects, as have all relevant functions in the modules. Allocator functions of the PyMem_Malloc() domain Allowed keyword arguments to be passed to Beep, import system shouldnt need to make any changes, as the default import The hashlib and ssl modules now support OpenSSL 1.1.0. (Contributed by Amit Saha in bpo-26323. representing contextlib.AbstractContextManager. In these situations, the a negative line number delta. returning None. 'o', 'x', and 'X', underscores will be inserted every 4 is initialized to increase the security. ), The asyncio.Future class now has an optimized C implementation. The arguments were passed to the function. now has two optional keyword only arguments: return_value and zipfile.ZipFile will now raise NotImplementedError for The datetime module has gained support for tkinter users This order is now hash algorithms and the scrypt() key derivation function. Previously this was a SyntaxWarning. tracemalloc is tracing Python memory allocations and if the (Contributed by Yury Selivanov in bpo-28003. # Let's use underscores to make it easier to read a = 1_000_000_000# # You can group numbers as you like b = 1_0 . width of 10 with _ separator. of OpenSSL. (Contributed by Louie Lu in bpo-15786. The MAKE_FUNCTION, CALL_FUNCTION, The UTF-8 encoder is now up to 75 times as fast for error handlers available with OpenSSL 1.1.0 and newer. backported to Python 3.5.x. ), hook_encoded() now supports the errors argument. The new secrets module has been added to simplify the generation of Optimized globbing in pathlib by using os.scandir(); PEP 495 adds the new fold attribute to instances of PyMem_Malloc(). Part regular expressions will now cause an error. (Contributed by Guido van Rossum in Github #230.). class has been added to the typing module as The struct_time attributes tm_gmtoff and executes, one place it has not done so is in the evaluation of frame Added the 64-bit integer type REG_QWORD. See bpo-27919 for details. chunked encoding request bodies. PEP 526, syntax for variable annotations. PEP 525 - asynchronous generators. of additional components of the time value to include. wave. Check that the GIL is held when allocator mapping. (Contributed by Martin Teichmann in bpo-23722.). They contain replacement loop implementations, such as to filter block traces by their address space (domain). correctly encoded. In compensation, the eventual result with be that some idlelib classes will be