Introduction to Python Course

I've been running into a bit of weirdness with Unions (and Optionals, of course) in Python - na… Read more How Do I Avoid Type Errors When Internal Function Returns 'union' That Could Be 'none'?

I've got a bunch of Django template inclusion tags, which take as an argument either a specific… Read more How Do I Type-hint That A Python Function Returns Instance Of Any Class Derived From A Superclass?

I wrote the following function: def _clean_dict(d): return {k: v for k, v in d.items() if v is … Read more Exclude Type In Python Typing Annotation

I want to iterate over List[A] and List[Subclass of A] and do the same loop. The best way I can see… Read more How Do I Make A Type Annotation For A List Of Subclass Instances, E.g To Concatenate Two Lists?

How do I properly type a class within itself? In PyCharm I am currently getting this error: This i… Read more Typing Hints Pycharm For A Class Used Within Itself

Could I specify exclusive type? Something like this: def foo(bar: Not[str]) -> None: assert … Read more Pep 484: Exclusive Type For Type Hint

Why does Mypy complain that it requires a type annotation for a list comprehension variable, when i… Read more Why Is Mypy Complaining About List Comprehension When It Can't Be Annotated?

I have a function that looks a bit like this. I want the function to accept any subclass of io.IOBa… Read more In Python Type-hinting, How Can I Make An Argument Accept Any Subclass Of A Base Class?

mypy --strict dutifully complains about the following code: from typing import Any, Dict def main(… Read more How To Make Mypy Complain About Assigning An Any To An Int

I am writing a CustomEnum class in which I want to add some helper methods, that would then be avai… Read more Type Hint For Return Value In Subclass

mypy --strict dutifully complains about the following code: from typing import Any, Dict def main(… Read more How To Make Mypy Complain About Assigning An Any To An Int

I have a function which validates its argument to accept only values from a given list of valid opt… Read more Typing: Dynamically Create Literal Alias From List Of Valid Values