# Buildsheet autogenerated by ravenadm tool -- Do not edit.

NAMEBASE=		python-typing-extensions
VERSION=		4.5.0
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[FILE:3042:descriptions/desc.single]
# Typing Extensions

[![Chat at
https://gitter.im/python/typing]](https://gitter.im/python/typing)

## Overview

The `typing_extensions` module serves two related purposes:

- Enable use of new type system features on older Python versions. For
example,
  `typing.TypeGuard` is new in Python 3.10, but `typing_extensions` allows
  users on previous Python versions to use it too.
- Enable experimentation with new type system PEPs before they are accepted
and
  added to the `typing` module.

New features may be added to `typing_extensions` as soon as they are
specified
in a PEP that has been added to the [python/peps]
repository. If the PEP is accepted, the feature will then be added to
`typing`
for the next CPython release. No typing PEP has been rejected so far, so we
haven't yet figured out how to deal with that possibility.

Starting with version 4.0.0, `typing_extensions` uses
[Semantic Versioning]. The
major version is incremented for all backwards-incompatible changes.
Therefore, it's safe to depend
on `typing_extensions` like this: `typing_extensions >=x.y, <(x+1)`,
where `x.y` is the first version that includes all features you need.

`typing_extensions` supports Python versions 3.7 and higher. In the future,
support for older Python versions will be dropped some time after that
version
reaches end of life.

## Included items

This module currently contains the following:

- Experimental features

  - `override` (see [PEP 698])
  - The `default=` argument to `TypeVar`, `ParamSpec`, and `TypeVarTuple`
(see [PEP 696])
  - The `infer_variance=` argument to `TypeVar` (see [PEP 695])
  - The `@deprecated` decorator (see [PEP 702])

- In `typing` since Python 3.11

  - `assert_never`
  - `assert_type`
  - `clear_overloads`
  - `@dataclass_transform()` (see [PEP 681])
  - `get_overloads`
  - `LiteralString` (see [PEP 675])
  - `Never`
  - `NotRequired` (see [PEP 655])
  - `reveal_type`
  - `Required` (see [PEP 655])
  - `Self` (see [PEP 673])
  - `TypeVarTuple` (see [PEP 646]; the `typing_extensions` version supports
the `default=` argument from [PEP 696])
  - `Unpack` (see [PEP 646])

- In `typing` since Python 3.10

  - `Concatenate` (see [PEP 612])
  - `ParamSpec` (see [PEP 612]; the `typing_extensions` version supports
the `default=` argument from [PEP 696])
  - `ParamSpecArgs` (see [PEP 612])
  - `ParamSpecKwargs` (see [PEP 612])
  - `TypeAlias` (see [PEP 613])
  - `TypeGuard` (see [PEP 647])
  - `is_typeddict`

- In `typing` since Python 3.9

  - `Annotated` (see [PEP 593])

- In `typing` since Python 3.8

  - `final` (see [PEP 591])
  - `Final` (see [PEP 591])
  - `Literal` (see [PEP 586])
  - `Protocol` (see [PEP 544])
  - `runtime_checkable` (see [PEP 544])
  - `TypedDict` (see [PEP 589])
  - `get_origin` (`typing_extensions` provides this function only in Python
3.7+)
  - `get_args` (`typing_extensions` provides this function only in Python
3.7+)

- In `typing` since Python 3.7

  - `OrderedDict`

- In `typing` since Python 3.5 or 3.6 (see [the typing documentation] for
details)


[FILE:119:distinfo]
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