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[3.12] gh-129567: Add a note to typing.TypedDict docs about name mangling (GH-130233) #130842

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Mar 4, 2025
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[3.12] gh-129567: Add a note to typing.TypedDict docs about name mangling (GH-130233) #130842

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11 changes: 8 additions & 3 deletions Doc/library/typing.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -2294,17 +2294,22 @@ types.
The keyword-argument syntax is deprecated in 3.11 and will be removed
in 3.13. It may also be unsupported by static type checkers.

The functional syntax should also be used when any of the keys are not valid
:ref:`identifiers <identifiers>`, for example because they are keywords or contain hyphens.
Example::
This functional syntax allows defining keys which are not valid
:ref:`identifiers <identifiers>`, for example because they are
keywords or contain hyphens, or when key names must not be
:ref:`mangled <private-name-mangling>` like regular private names::

# raises SyntaxError
class Point2D(TypedDict):
in: int # 'in' is a keyword
x-y: int # name with hyphens

class Definition(TypedDict):
__schema: str # mangled to `_Definition__schema`

# OK, functional syntax
Point2D = TypedDict('Point2D', {'in': int, 'x-y': int})
Definition = TypedDict('Definition', {'__schema': str}) # not mangled

By default, all keys must be present in a ``TypedDict``. It is possible to
mark individual keys as non-required using :data:`NotRequired`::
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