mypy question

[Mats Wichmann]

On 12/29/23 08:02, Karsten Hilbert via Python-list wrote:

>> Dict[str, str] means the key type and value type should both be strings,
> 
> Indeed, I know that much, list[dict[str, str]] is what is getting
> passed in in this particular invocation of run_rw_queries().
> 
> For what it's worth here's the signature of that function:
> 
> 	def run_rw_queries (
> 		link_obj:_TLnkObj=None,
> 		queries:list[dict[str, str | list | dict[str, Any]]]=None,
> 		end_tx:bool=False,
> 		return_data:bool=None,
> 		get_col_idx:bool=False,
> 		verbose:bool=False
> 	) -> tuple[list[dbapi.extras.DictRow], dict[str, int] | None]:
> 
> Given that I would have thought that passing in
> list[dict[str, str]] for "queries" ought to be type safe.
> Mypy indicates otherwise which I am not grokking as to why.

ah... didn't grok what you were asking, sorry - ignore my attempt then. 
So you are passing something that has been typed more narrowly than the 
function parameter. Can you use a TypeGuard here?