use-types-from-typing¶

Collection: fixit Autofix: Yes Python: `< 3.9`

For Python < 3.9 only, require typing.Dict, typing.List, typing.Set, and typing.Tuple annotations instead of builtin generic aliases such as dict[str, str].

Message¶

For Python < 3.9, builtins.{builtin_type} is used as a type annotation but the type system doesn’t recognize it as a valid type. Use typing.{correct_type} instead.

Valid examples¶

def function(list: List[str]) -> None:
    pass

def function() -> None:
    thing: Dict[str, str] = {}

def function() -> None:
    thing: Tuple[str]

from typing import Dict, List
def function() -> bool:
        return Dict == List

from typing import List as list
from graphene import List

def function(a: list[int]) -> List[int]:
        return []

from builtins import list as ListType

LT = ListType

class LT:
    def __class_getitem__(cls, item):
        return cls

def func(value: LT[str]) -> None:
    pass

Invalid examples¶

from typing import List
def whatever(list: list[str]) -> None:
    pass

Suggested fix

from typing import List
def whatever(list: List[str]) -> None:
    pass

def function(list: list[str]) -> None:
    pass

def func() -> None:
    thing: dict[str, str] = {}

def func() -> None:
    thing: tuple[str]

from typing import Dict
def func() -> None:
    thing: dict[str, str] = {}

Suggested fix

from typing import Dict
def func() -> None:
    thing: Dict[str, str] = {}

from builtins import list as ListType

def func(value: ListType[str]) -> None:
    pass

from builtins import list as ListType

LT = ListType

def func(value: LT[str]) -> None:
    pass

from builtins import list as ListType

LT = OtherLT = ListType

def func(value: OtherLT[str]) -> None:
    pass