How to use type hints in python 3.6?
I noticed Python 3.5 and Python 3.6 added a lot of features about static type checking, so I tried with the following code (in python 3.6, stable version).
python-typing
Validating detailed types in python dataclasses
Python 3.7 was released a while ago, and I wanted to test some of the fancy new dataclass+typing features. Getting hints to work right is easy enough, with both native types and those from the typing module:
Type hints with user defined classes
Couldn’t seem to find a definitive answer. I want to do a type hint for a function and the type being some custom class that I have defined, called it CustomClass().
How to specify “nullable” return type with type hints
Suppose I have a function:
Subclass in type hinting
I want to allow type hinting using Python 3 to accept sub classes of a certain class. E.g.:
Type annotations for *args and **kwargs
I’m trying out Python’s type annotations with abstract base classes to write some interfaces. Is there a way to annotate the possible types of *args and **kwargs?
How should I use the Optional type hint?
I’m trying to understand how to use the Optional type hint. From PEP-484, I know I can use Optional for def test(a: int = None) either as def test(a: Union[int, None]) or def test(a: Optional[int]).
How can I tell PyCharm what type a parameter is expected to be?
When it comes to constructors, and assignments, and method calls, the PyCharm IDE is pretty good at analyzing my source code and figuring out what type each variable should be. I like it when it’s right, because it gives me good code-completion and parameter info, and it gives me warnings if I try to access an attribute that doesn’t exist.
How to annotate types of multiple return values?
How do I use type hints to annotate a function that returns an Iterable that always yields two values: a bool and a str? The hint Tuple[bool, str] is close, except that it limits the return value type to a tuple, not a generator or other type of iterable.