KnowCardPython · Type Annotations
Since Python 3.10, what's the modern way to write Union[int, float] and Optional[str]?
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What does this print, and does it raise?
```
def repeat(s: str, n: int) -> str:
return s * n
print(repeat(["P"], 3))
```
True or false: adding type annotations makes Python check the argument types when a function is called, raising an error on a mismatch.
What is the correct syntax to annotate a function's parameters AND its return type?
Does Optional[int] mean the argument is optional (can be omitted)?
What is Optional[X] equivalent to, written as a plain union?
How do you annotate a variable (with and without assigning a value)?
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