non-pep604-annotation (UP007)#
Derived from the pyupgrade linter.
Fix is sometimes available.
What it does#
Check for type annotations that can be rewritten based on PEP 604 syntax.
Why is this bad?#
PEP 604 introduced a new syntax for union type annotations based on the
| operator. This syntax is more concise and readable than the previous
typing.Union and typing.Optional syntaxes.
This rule is enabled when targeting Python 3.10 or later (see:
target-version). By default, it's also enabled for earlier Python
versions if from __future__ import annotations is present, as
__future__ annotations are not evaluated at runtime. If your code relies
on runtime type annotations (either directly or via a library like
Pydantic), you can disable this behavior for Python versions prior to 3.10
by setting pyupgrade.keep-runtime-typing to true.
Example#
Use instead: