Article (8 levels of using type hints in python) from PythonBytes episode 317

[heathdbrown]

Brian #4: 8 Levels of Using Type Hints in Python

• Yang Zhou (yahng cho)
• A progression of using type hints that seems to track how I’ve picked them up

1. Type Hints for Basic Data Types.
   • x: int
2. Define a Constant Using Final Type
   • DB: Final = '``PostgreSQL'
   • (ok. I haven’t used this one at all yet)
3. Adding multiple type hints to one variable.
   • int | None
4. Using general type hints.
   • def func(nums: Iterable)
   • Also using Optional
5. Type hints for functions
   • def func(name: str) → str:
   • (I probably would put this at #2)
6. Alias of type hints (not used this yet, but looks cool)
   • PostsType = dict[int, str]
   • new_posts: PostsType = {1: 'Python Type Hints', 2: 'Python Tricks'}
7. Type hints for a class itself, i.e. Self type from typing import Self
   • class ListNode: def __init__(self, prev_node: Self) -> None: pass
8. Provide literals for a variable. (not used this yet, but looks cool)

    from typing import Literal 
    weekend_day: Literal['Saturday', 'Sunday'] 
    weekend_day = 'Saturday' weekend_day = 'Monday' # will by a type error

Article Reference:

• PythonBytes Episode 317
• https://medium.com/techtofreedom/8-levels-of-using-type-hints-in-python-a6717e28f8fd

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