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PEP 695: Use an unquoted forward reference in the type alias example by adamtheturtle · Pull Request #5153 · python/peps · GitHub

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PEP 695: Use an unquoted forward reference in the type alias example #5153

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PEP 695: Use an unquoted forward reference in the type alias example #5153

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6 changes: 4 additions & 2 deletions peps/pep-0695.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -331,12 +331,14 @@ for type parameters.
type ListOrSet[T] = list[T] | set[T]


Type aliases can refer to themselves without the use of quotes.
Type aliases can refer to themselves and to names defined later without the use
of quotes. The value of a type alias is evaluated lazily (see `Lazy Evaluation`_),
so these names need not be defined when the alias is declared.

::

# A type alias that includes a forward reference
type AnimalOrVegetable = Animal | "Vegetable"
type AnimalOrVegetable = Animal | Vegetable

# A generic self-referential type alias
type RecursiveList[T] = T | list[RecursiveList[T]]
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