typing-utils
Backport Python3.8+ typing utils & issubtype & more
Install
pip install typing_utils
API
issubtype
Check that the left argument is a subtype of the right.
For unions, check if the type arguments of the left is a subset of the right. Also works for nested types including ForwardRefs.
Examples:
from typing_utils import issubtype
issubtype(typing.List, typing.Any) == True
issubtype(list, list) == True
issubtype(list, typing.List) == True
issubtype(list, typing.Sequence) == True
issubtype(typing.List[int], list) == True
issubtype(typing.List[typing.List], list) == True
issubtype(list, typing.List[int]) == False
issubtype(list, typing.Union[typing.Tuple, typing.Set]) == False
issubtype(typing.List[typing.List], typing.List[typing.Sequence]) == True
JSON = typing.Union[
int, float, bool, str, None, typing.Sequence["JSON"],
typing.Mapping[str, "JSON"]
]
issubtype(str, JSON, forward_refs={'JSON': JSON}) == True
issubtype(typing.Dict[str, str], JSON, forward_refs={'JSON': JSON}) == True
issubtype(typing.Dict[str, bytes], JSON, forward_refs={'JSON': JSON}) == False
get_origin
Get the unsubscripted version of a type.
This supports generic types, Callable, Tuple, Union, Literal, Final and ClassVar. Return None for unsupported types.
Examples:
from typing_utils import get_origin
get_origin(Literal[42]) is Literal
get_origin(int) is None
get_origin(ClassVar[int]) is ClassVar
get_origin(Generic) is Generic
get_origin(Generic[T]) is Generic
get_origin(Union[T, int]) is Union
get_origin(List[Tuple[T, T]][int]) == list
get_args
Get type arguments with all substitutions performed.
For unions, basic simplifications used by Union constructor are performed.
Examples:
from typing_utils import get_args
get_args(Dict[str, int]) == (str, int)
get_args(int) == ()
get_args(Union[int, Union[T, int], str][int]) == (int, str)
get_args(Union[int, Tuple[T, int]][str]) == (int, Tuple[str, int])
get_args(Callable[[], T][int]) == ([], int)
get_type_hints
Return type hints for an object.
This is often the same as obj.annotations, but it handles forward references encoded as string literals, and if necessary adds Optional[t] if a default value equal to None is set.
The argument may be a module, class, method, or function. The annotations are returned as a dictionary. For classes, annotations include also inherited members.
TypeError is raised if the argument is not of a type that can contain annotations, and an empty dictionary is returned if no annotations are present.
BEWARE -- the behavior of globalns and localns is counterintuitive (unless you are familiar with how eval() and exec() work). The search order is locals first, then globals.
-
If no dict arguments are passed, an attempt is made to use the globals from obj (or the respective module's globals for classes), and these are also used as the locals. If the object does not appear to have globals, an empty dictionary is used.
-
If one dict argument is passed, it is used for both globals and locals.
-
If two dict arguments are passed, they specify globals and locals, respectively.
103 Jun 23, 2022
398 Dec 23, 2022
315 Dec 25, 2022
41 Dec 28, 2022
20 Nov 01, 2022
16 Oct 10, 2022
118 Dec 22, 2022
14.4k Jan 08, 2023
270 Nov 24, 2022
25 Dec 26, 2022
45 Dec 13, 2022
2.1k Jan 01, 2023
1.1k Jan 02, 2023
13 Nov 03, 2022
36 Oct 29, 2022
194 Dec 19, 2022
22 Aug 27, 2022
1.3k Jan 08, 2023
238 Dec 27, 2022