python TypeError

[LeeKiYoung]

Traceback (most recent call last):
  File "/Users/leekiyoung/.local/bin/perplexity", line 56, in <module>
    class ApiConfig:
  File "/Users/leekiyoung/.local/bin/perplexity", line 58, in ApiConfig
    api_key: str | None = None
TypeError: unsupported operand type(s) for |: 'type' and 'NoneType'

This occurs when using the new type hint (union type) syntax like str | None in Python 3.10 or earlier.
This syntax (str | None) is only supported in Python 3.10 or later.

It is python3.6+ as written in readme.md.

[LeeKiYoung]

and,

    def get_api_key_from_system() -> Optional[str]:
        return os.environ.get("PERPLEXITY_API_KEY")

The code needs to be modified.

[LeeKiYoung]

and,

    @staticmethod
    def get_AVAILABLE_MODELS() -> List[str]:
        return AVAILABLE_MODELS

Same here.