PEP 604
E901490
PEP 604 is a Python Enhancement Proposal that introduced the modern, concise syntax for expressing type unions (using the `|` operator) in Python’s type hints.
All labels observed (1)
| Label | Occurrences |
|---|---|
| PEP 604 canonical | 2 |
Statements (36)
| Predicate | Object |
|---|---|
| instanceOf | Python Enhancement Proposal ⓘ |
| acceptedBy | Python core developers NERFINISHED ⓘ |
| affects | Python type hinting system ⓘ |
| appliesTo | typing.Optional via X | None ⓘ |
| author |
Jelle Zijlstra
NERFINISHED
ⓘ
Pradeep Kumar Srinivasan NERFINISHED ⓘ Łukasz Langa NERFINISHED ⓘ |
| category | Typing ⓘ |
| clarifies |
how unions are represented at runtime
ⓘ
interaction of | with existing typing constructs ⓘ |
| createdForVersion | Python 3.10 NERFINISHED ⓘ |
| defines |
behavior of | operator on types at runtime
ⓘ
semantics of X | Y for typing ⓘ |
| discusses | backwards compatibility of union syntax ⓘ |
| documentedAt | https://peps.python.org/pep-0604/ ⓘ |
| governs | syntax of union types in standard library type hints ⓘ |
| hasNumber | 604 ⓘ |
| hasTitle | Allow writing union types as X | Y ⓘ |
| influences |
type checkers such as Pyre
ⓘ
type checkers such as mypy ⓘ type checkers such as pyright ⓘ |
| introducedIn | Python 3.10 NERFINISHED ⓘ |
| language | Python NERFINISHED ⓘ |
| motivation |
make type hints more readable
ⓘ
reduce verbosity of typing.Union ⓘ |
| proposesFeature |
modern concise syntax for type unions
ⓘ
using | operator for type unions in type hints ⓘ |
| recommends | preferring X | Y over typing.Union[X, Y] in new code ⓘ |
| relatedTo |
PEP 563
NERFINISHED
ⓘ
PEP 585 NERFINISHED ⓘ PEP 649 NERFINISHED ⓘ |
| replacesSyntax | typing.Union[X, Y] with X | Y ⓘ |
| scope | static type checking ⓘ |
| standardizes | use of | for unions across typing ecosystem ⓘ |
| status | Final ⓘ |
| usesOperator | bitwise or operator | ⓘ |
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.