TypedDict and missing keys

[dineshbvadhia]

Hi. I don't understand why the following causes a Missing keys error?

class ConnectKwargs(TypedDict):
    host: str
    user: str
    port: str

class TransportParams(ConnectKwargs):
    connect_kwargs: ConnectKwargs
    keyfile: str | None
    passphrase: str | None
    
connect_kwargs: ConnectKwargs = {'host':payload['host'], 'user':payload['user'], 'port':payload['port']}
transport_params: TransportParams = {'connect_kwargs':connect_kwargs, 'keyfile':payload['keyfile'], 'passphrase':payload['passphrase']}

error: Missing keys ("host", "user", "port") for TypedDict "TransportParams" [typeddict-item]

[brianschubert]

Since TransportParams is a subclass of ConnectKwargs, it inherits all of the keys of ConnectKwargs, more or less the same as if you had written

class TransportParams(TypedDict):
    host: str
    user: str
    port: str
    connect_kwargs: ConnectKwargs
    keyfile: str | None
    passphrase: str | None

See TypedDict - Inheritance from the typing spec for more details.