How to properly use function call where a mapping is expected

[maru-sama]

Hi, I guess this is a pretty simple question, but I cannot figure it out. I am using the httpx.get method and want to specify headers. My call (simplified) looks like this...

httpx.get("https://example.com", headers={"one": "two"})

Mypy is complaining with the following error...
Argument "headers" to "get" of "Client" has incompatible type "dict[str, str|None]"; expexted "Headers| Mapping[str, str,]| Mapping[bytes, bytes]|Sequence[tuple[str, str]]| Sequence[tuple[bytes,bytes]] | None

The code works and I can "fix" this issue by specifying a variable as Mapping[str,str] first and then using it, but I think this is a little bit too complex, is there a better solution for this?

[erictraut]

Are you sure you're running the latest version of mypy (1.4) and have the latest version of httpx (0.24.1) installed? Your code type checks without errors for me in both mypy and pyright.

Here's a minimal, self-contained code sample:

import httpx
httpx.get("https://example.com", headers={"one": "two"})

[maru-sama]

Sorry, I should have shown my real code, but youre reply made me think....

This is working...

ser = cl.get( "https://api.twitch.tv/helix/users", headers={ "Authorization": f"Bearer {self.config['access_token']}", "Client-Id": self.config["client_id"], }, )

but not this

ser = cl.get( "https://api.twitch.tv/helix/users", headers={ "Authorization": f"Bearer {self.config.get('access_token')}", "Client-Id": self.config.get("client_id"), }, )
I guess the .get() call is creating an issue since it can return "None",

[maru-sama]

Okj, it is the last assignment, if I use self.config.get("client_id", "") it works. Sorry that I did not try this before, it makes a lot of sense that this throws an error.