Type annotations with `RecordDict` not satisfying mypy about maxmind-db-reader-python HOT 3 CLOSED

The mypy documentation that I linked to provided several different approaches. I don't have any additional suggestions beyond those. For GeoIP2 or GeoLite2 databases, we provide the geoip2 package that has structured model classes for each database type. However, it appears you are using a competitor's database, which I believe has a different internal layout.

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As the return type suggests, a get call can return may different types depending on the particular database being used. Please see the mypy documentation on type narrowing.

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@oschwald I'm familiar w/ type narrowing, but the way I'm getting it to work for this looks incredibly hacky:

def ipinfo_db_lookup(ip_address: str) -> dict | None:
    with maxminddb.open_database(ipinfo_db_path) as reader:
        ip_record = reader.get(ip_address)
        assert isinstance(ip_record, dict | type(None))
        # could also be:
        # assert isinstance(ip_record, dict) or ip_record is None
    return ip_record

Is there a more graceful way of tackling this?

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