Remove redundant inheritances from Iterator in builtins

[tungol]

This is the last batch of them; I saved the builtins for last.

previous: #12813#12814#12816#12827

The unrelated extra newline in this MR was black's idea, not mine, to be clear.

[tungol]

Three of the hits look like the ternary join issue again:

Here's Spack:

defanchorify(data: dict|list) ->None:
forkey, valueindata.items() ifisinstance(data, dict) elseenumerate(data):
pass

Optuna:

deffoo(values: list[str], names: list[str] |None):
iterator=enumerate(values) ifnamesisNoneelsezip(names, values)
foriteminiterator:
pass

PySpark:

fromtypingimportAnydefdrop(labels: Any):
iflabelsisnotNone:
returnfoo= []
cols, labels=zip(*foo) iflen(foo) >0else ([], [])
[labelforlabelinlabels]

Ibis and psycopg show errors going away, and I think represent mypy inferring Any where it didn't before.

The error from Ibis going away looks like this:

fromcollections.abcimportIterableclassValue:
defcases(self, *branches: tuple[Value, Value]) ->Value: ...
deflabel(self, labels: Iterable[str]) ->Value:
returnself.cases(*enumerate(labels))

Take away the type: ignore from psycopg and the diff is:

< tests/types/test_datetime.py:785: error: Argument 1 to "time" has incompatible type "*map[int]"; expected "tzinfo | None" [arg-type]< tests/types/test_datetime.py:807: error: Argument 1 to "datetime" has incompatible type "*map[int]"; expected "tzinfo | None" [arg-type]

Which comes from something like this:

importdatetimedefas_time(s):
datetime.time(*map(int, s.split(",")))
defas_naive_dt(s):
datetime.datetime(*map(int, s.split(",")))

Following on from the revert and discussion of the related itertools MR (#12816 and #12853 ), I believe that all of these are blocking. I'll close out this MR in a day or two if nobody else has anything to say about it.

[tungol]

Moving this to open since the revert of #12816 wasn't necessary. I'm pretty sure the three new messages in mypy-primer will go away for mypy 1.12.

[hauntsaninja]

Let's update typeshed to latest mypy to confirm before merging this!

[hauntsaninja]

Also this class of change probably makes type checkers slower, since structural checks are more expensive than nominal checks

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

psycopg (https://github.com/psycopg/psycopg)
+ tests/types/test_datetime.py:785: error: Unused "type: ignore" comment [unused-ignore]+ tests/types/test_datetime.py:807: error: Unused "type: ignore" comment [unused-ignore]
ibis (https://github.com/ibis-project/ibis)
- ibis/expr/types/numeric.py:1223: error: Argument 1 to "cases" of "Value" has incompatible type "*enumerate[str]"; expected "tuple[Value, Value]" [arg-type]