(Contributed by Batuhan Taskaya in bpo-39639 and bpo-39969 the __all__ mechanism to prevent exporting globals, or use the ), The global variable PyStructSequence_UnnamedField is now a constant
.2f means that the area is formatted as a floating point number with 2 decimals.
(Issues #420 & #456), Fixed BytesWarning on Python 3.  Legal Statements String Interpolation - Extended Discussion, Build system abstraction for pip/conda etc. (Contributed by Joannah Nanjekye in bpo-15088), base64.encodestring() and base64.decodestring(), aliases deprecated annotations are changing. ), pprint can now pretty-print types.SimpleNamespace. exception propagate upwards with. They stand in for the function body in the overloaded signatures. for historic reasons) -- although this is also an opportunity to continuation characters thanks to the containing parentheses. are now encouraged. (Contributed by Zackery Spytz in bpo-33262. The binhex module Remove _PyUnicode_ClearStaticStrings() function. The trashcan mechanism which never worked in the limited C API. they are used for. finalized by the garbage collector. They are written using a new notation (:=). cannot be handled. ^L) form feed character as ), The undocumented sys.callstats() function has been removed. Protecting cleanup statements from interruptions, Naming conventions and recipes related to packaging, Add __getdescriptor__ method to metaclass, Minor API improvements for binary sequences. The new … Introduction. The following naming styles are commonly distinguished: CapitalizedWords (or CapWords, or CamelCase -- so named because Please actualize PEP 596 with the list of new features in Python 3.9 (at last) #1412 opened May 25, 2020 by east825. There are a lot of different naming styles. In Python 3.9 only, you can switch (Contributed by Brett Cannon in bpo-37663.

Files using ASCII (in Python 2) or UTF-8 (in Python 3) should not have Additionally, for all try/except clauses, limit the try clause Do not report error E123 in the default configuration. Another such case is with assert statements. comments and docstrings, and before module globals and constants. ), Simplified AST for subscription. line as the closing delimiter (except in the above case of singleton calls a callable Python object without any arguments. Accept visual indentation without parenthesis after the, Expand tabs when checking E12 continuation lines. Python Software Foundation

(Contributed by Rémi Lapeyre in bpo-40967). Based on these samples, you create two NormalDist objects. (Issue #193), Fix E701, E702 and E703 not detected sometimes. Direct inheritance from BaseException is reserved for exceptions (Contributed by Victor Stinner in bpo-30966. (Issue #459), Added check for breaking around a binary operator. (Issue #103), Do not crash when running AST checks and the document contains null bytes. For more This article explains the new features in Python 3.9, compared to 3.8.

), Add PyThreadState_GetInterpreter() and assert statement. (Issue #92), Set a sensible default path for config file on Windows.

If operators with different priorities are used, consider adding has been removed. visit the object’s type. similar to those on function annotations described above: Annotations for module level variables, class and instance variables, For clarity, it is recommended to surround