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README: Updates re NamedTuple and TypedDict #155

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JelleZijlstra merged 1 commit into from
Apr 24, 2023
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README: Updates re NamedTuple and TypedDict #155

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README: Updates re NamedTuple and TypedDict 
Followup to #150
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@AlexWaygood
AlexWaygood authored Apr 24, 2023
commit 566e370063c569876974f1f0c8c000385b9d0a9a
9 changes: 7 additions & 2 deletions README.md
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Expand Up @@ -127,7 +127,10 @@ Certain objects were changed after they were added to `typing`, and
about which (if any) keys are non-required in Python 3.8, and does not
honor the `total` keyword with old-style `TypedDict()` in Python
3.9.0 and 3.9.1. `TypedDict` also does not support multiple inheritance
with `typing.Generic` on Python <3.11.
with `typing.Generic` on Python <3.11, and `TypedDict` classes do not
consistently have the `__orig_bases__` attribute on Python <3.12. The
`typing_extensions` backport provides all of these features and bugfixes on
all Python versions.
- `get_origin` and `get_args` lack support for `Annotated` in
Python 3.8 and lack support for `ParamSpecArgs` and `ParamSpecKwargs`
in 3.9.
Expand All @@ -137,7 +140,9 @@ Certain objects were changed after they were added to `typing`, and
`typing_extensions.get_overloads()`, you must use
`@typing_extensions.overload`.
- `NamedTuple` was changed in Python 3.11 to allow for multiple inheritance
with `typing.Generic`.
with `typing.Generic`. Call-based `NamedTuple`s were changed in Python 3.12
so that they have an `__orig_bases__` attribute, the same as class-based
`NamedTuple`s.
- Since Python 3.11, it has been possible to inherit from `Any` at
runtime. `typing_extensions.Any` also provides this capability.
- `TypeVar` gains two additional parameters, `default=` and `infer_variance=`,
Expand Down