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Thedeprecation section has a list of deprecatedfeatures.(Contributed by Christian Heimes in bpo-43880.) Deprecated function and use of deprecated constants now result ina DeprecationWarning. Add inspect.get_annotations(), which safely computes the annotationsdefined on an object. Add audit hooks for gc.get_objects(), gc.get_referrers() andgc.get_referents(). Fileinput.hook_compressed() now returns TextIOWrapper objectwhen mode is “r” and file is compressed, like uncompressed files.(Contributed by Inada Naoki in bpo-5758.)
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A TypedDict can be introspected via annotations dicts(see Annotations Best Practices for more information on annotations best practices),__total__, __required_keys__, and __optional_keys__. By default, all keys must be present in a TypedDict. An alternative way to create a TypedDict is by usingfunction-call syntax.
1.4. Nested List Comprehensions¶
The popitem() method for ordered dictionaries returns and removes a(key, value) pair. Return an instance of a dict subclass that has methodsspecialized for rearranging dictionary order. Since a named tuple is a regular Python class, it is easy to add or changefunctionality with a subclass. Useful for introspectionand for creating new named tuple types from existing named tuples. In addition to the methods inherited from tuples, named tuples supportthree additional methods and two attributes.
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- ABC for classes that provide the __len__() method.
- This means that get() will, likenormal dictionaries, return None as a default rather than usingdefault_factory.
- If the decorated objectdoes not support setting attributes, the decorator returns the object unchangedwithout raising an exception.
- Type variables exist primarily for the benefit of static typecheckers.
- A NewType is considered a distinct type by a typechecker.
These functions and classes should not be used directly as annotations.Their intended purpose is to be building blocks for creating and declaringtypes. They serve as the parameters for generic types as wellas for generic function and type alias definitions.See Generic for moreinformation on generic types. Incontrast, a variable annotated with typeC (or deprecatedtyping.TypeC) may accept values that are classesthemselves – specifically, it will accept the class object of C.
The bdist_wininst command deprecated in Python 3.8 has been removed.The bdist_wheel command is now recommended to distribute binary packageson Windows.(Contributed by Victor Stinner in bpo-42802.) There are no plans to migrateany other functionality from distutils, and applications that areusing other functions should plan to make private copies of the code.Refer to PEP 632 for discussion. The entire distutils package is deprecated, to be removed in Python3.12. Here, z and t are keyword-only parameters, while x andy are not.(Contributed by Eric V. Smith in bpo-43532.)
These submodules have been deprecated sincePython 3.8 and will be removed in a future version of Python. Users should decorate theirsubclasses with the runtime_checkable() decoratorif they want runtime protocols.(Contributed by Yurii Karabas in bpo-38908.) The behavior of typing.Literal was changed to conform with PEP 586and to match the behavior of static type checkers specified in the PEP. The ssl module uses heap-types and multi-phase initialization.(Contributed by Christian Heimes in bpo-42333.) Add a timeout parameter to the ssl.get_server_certificate() function.(Contributed by Zackery Spytz in bpo-31870.) The deprecated protocols SSL 3.0, TLS 1.0, and TLS 1.1 are no longerofficially supported.
TypeGuard has been added to the typing module to annotatetype guard functions and improve information provided to static type checkersduring type narrowing. This simplicity sometimes made it difficultfor type checkers to distinguish between type aliases and ordinary assignments,especially when forward references or invalid types were involved. Previously, there was no easy way to type annotatedependency of parameter types in such a precise manner. You can use positional parameters with some builtin classes that provide anordering for their attributes (e.g. dataclasses). If you are using classes to structure your data, you can use as a patternthe class name followed by an argument list resembling a constructor. This change to the semantics of locals() in optimized scopes alsoaffects the default behavior of code execution functions that implicitlytarget locals() if no explicit namespace is provided(such as exec() and eval()).In previous versions, whether or not changes could be accessed by callinglocals() after calling the code execution function wasimplementation-dependent.
Deprecated alias to collections.abc.MappingView. Deprecated alias to collections.abc.Mapping. Deprecated alias to collections.abc.KeysView. Deprecated alias to collections.abc.ItemsView. Deprecated alias to collections.abc.Container. Deprecated alias to collections.abc.Collection.