What are some examples of type annotations in Python?

What are some examples of type annotations in Python?

Type annotations in Python are used to indicate the expected data types of variables. For example:

1. def add(a: int, b: int) -> int: - This function takes two integers and returns an integer.
2. def greet(name: str) -> None: - This function takes a string and returns nothing.
3. def get_user_info() -> Tuple[str, int]: - This function returns a tuple containing a string and an integer.

Can you explain how to use type annotations with lists?

Certainly! You can use type annotations with lists by specifying the type of elements in the list. For example:

• def process_numbers(numbers: List[int]) -> None: indicates that the function expects a list of integers.

What about using type annotations with dictionaries?

For dictionaries, you can specify the types of keys and values. For example:

• def get_user_data() -> Dict[str, Union[str, int]]: indicates a dictionary where keys are strings and values can be either strings or integers.

Are there any benefits to using type annotations?

Yes, type annotations improve code readability, help with debugging, and enable better support from IDEs and static type checkers.