Am Fri, Dec 29, 2023 at 07:49:17AM -0700 schrieb Mats Wichmann via Python-list:
> >I am not sure why mypy thinks this
> >
> >gmPG2.py:554: error: Argument "queries" to "run_rw_queries" has incompatible
> >type "List[Dict[str, str]]"; expected
> >"List[Dict[str, Union[str, List[Any], Dict[str, Any]]]]" [arg-type]
> > rows, idx = run_rw_queries(link_obj = conn, queries =
> > queries, return_data = True)
> >
> > ^~~~~~~
> >
> >should be flagged. The intent is for "queries" to be
> >
> >a list
> > of dicts
> > with keys of str
> > and values of
> > str OR
> > list of anything OR
> > dict with
> > keys of str
> > and values of anything
> >
> >I'd have thunk list[dict[str,str]] matches that ?
>
> 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.
> but in your
> retelling above you indicate lots of possible value types... actually the
> mypy guess
> seems to be a pretty good recreation of your psuedo-code description.
I agree that mypy's grasp of my intent from
queries:list[dict[str, str | list | dict[str, Any]]]=None,
into
"List[Dict[str, Union[str, List[Any], Dict[str, Any]]]]"
seems accurate. I just don't understand why list[dict[str,
str]] should not pass that construct.
Karsten
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