Typing Support For Type Hints Python 3 12 3 Documentation
gt gt gt from typing import Annotated get type hints gt gt gt def func x Annotated int quot metadata quot gt None pass gt gt gt get type hints func x lt class int gt return lt class NoneType gt gt gt gt get type hints func include extras True x typing Annotated int metadata return lt class NoneType gt
Python 3 Type Hinting For None Stack Overflow, return nun gt gt gt nothing None gt gt gt Or at least it can be Since these annotations are meaningless to Python beyond being in correct syntax it s sort of up to the tools If you use typecheck decorator for example then you ll need to use type None gt gt gt import typecheck as tc gt gt gt gt gt gt tc typecheck gt gt gt def nothing nun type None gt
Python How To Specify quot nullable quot Return Type With Type Hints
2 Answers Sorted by 638 You re looking for Optional Since your return type can either be datetime as returned from datetime utcnow or None you should use Optional datetime from typing import Optional
How To Use Type Hints For Multiple Return Types In Python, This function uses the Union type from the typing module to indicate that parse email returns either a string or None depending on the input value Whether you use the old or new syntax a union type hint can combine more than two data types
26 1 Typing Support For Type Hints Python 3 6 3
26 1 Typing Support For Type Hints Python 3 6 3 , The function below takes and returns a string and is annotated as follows def greeting name str gt str return Hello name In the function greeting the argument name is expected to be of type str and the return type str Subtypes are accepted as arguments 26 1 1 Type aliases 182 A type alias is defined by assigning the type to the alias
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Python Type Hint Annotating Nullable And Noneable Return Type
Python Type Hint Annotating Nullable And Noneable Return Type Prior to Python 3 10 the Optional type hint was used to indicate that a return type could be either of a specified type or None The Optional type is a part of the typing module and its usage is straightforward To declare an Optional type you use Optional Type where Type is the data type that the function can return aside from None
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The Optional type is a way to denote that a variable or a return type could either have a specified type or be None This took a crucial role in static type checking and made Python s loosely typed nature more structured without sacrificing its dynamic fluidity Using Optional Type In Python explained With Examples . Python gt gt gt thing quot Hello quot gt gt gt type thing lt class str gt gt gt gt thing 28 1 gt gt gt type thing lt class float gt type returns the type of an object These examples confirm that the type of thing is allowed to change and Python correctly infers the type as it changes From typing import List ratings List int 1 2 3 Code language Python python None type If a function doesn t explicitly return a value you can use None to type hint the return value For example def log message str gt None print message Code language Python python Summary
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