drop Python 3.8 support (#10265)

* drop Python 3.8

Note that this PR only makes typing related changes.
Other changes can be done once this gets merged, they
are relatively few in numbers.

* bump build python version

* add typing_extensions to lint group

tests/func/api/test_show.py

@@ -1,13 +1,12 @@
 import json
 import os
 from textwrap import dedent
-from typing import Dict, List
 
 import pytest
 
 from dvc import api
 
-TRAIN_METRICS: List[Dict[str, Dict[str, float]]] = [
+TRAIN_METRICS: list[dict[str, dict[str, float]]] = [
     {
         "avg_prec": {"train": 0.85, "val": 0.75},
         "roc_auc": {"train": 0.80, "val": 0.70},
@@ -17,7 +16,7 @@ TRAIN_METRICS: List[Dict[str, Dict[str, float]]] = [
         "roc_auc": {"train": 0.98, "val": 0.94},
     },
 ]
-TEST_METRICS: List[Dict[str, Dict[str, float]]] = [
+TEST_METRICS: list[dict[str, dict[str, float]]] = [
     {"avg_prec": {"test": 0.72}, "roc_auc": {"test": 0.77}},
     {
         "avg_prec": {"test": 0.91},

tests/func/test_daemon.py

@@ -4,11 +4,12 @@ import re
 import subprocess
 import sys
 from collections import defaultdict
+from collections.abc import Iterator
 from contextlib import contextmanager, suppress
 from http.server import HTTPServer, SimpleHTTPRequestHandler
 from pathlib import Path
 from threading import Thread
-from typing import ClassVar, Dict, Iterator
+from typing import ClassVar
 
 import psutil
 import pytest
@@ -42,7 +43,7 @@ UPDATER_INFO_STR = json.dumps(UPDATER_INFO).encode("utf8")
 def make_request_handler():
     class RequestHandler(SimpleHTTPRequestHandler):
         # save requests count for each method
-        hits: ClassVar[Dict[str, int]] = defaultdict(int)
+        hits: ClassVar[dict[str, int]] = defaultdict(int)
 
         def log_message(self, format, *args) -> None:  # noqa: A002
             super().log_message(format, *args)

tests/func/test_ignore.py

@@ -1,7 +1,6 @@
 import os
 import shutil
 from pathlib import Path
-from typing import List
 
 import pytest
 
@@ -14,7 +13,7 @@ from dvc_data.hashfile.build import IgnoreInCollectedDirError
 from dvc_data.hashfile.utils import get_mtime_and_size
 
 
-def _to_pattern_info_list(str_list: List):
+def _to_pattern_info_list(str_list: list):
     return [PatternInfo(a, "") for a in str_list]
 
 

tests/integration/plots/test_plots.py

@@ -1,7 +1,6 @@
 import json
 import os
 from copy import deepcopy
-from typing import Dict, List
 from urllib.parse import urlparse
 from urllib.request import url2pathname
 
@@ -57,7 +56,7 @@ def extract_vega_specs(html_path, plots_ids):
     return result
 
 
-def drop_fields(datapoints: List[Dict], fields: List[str]):
+def drop_fields(datapoints: list[dict], fields: list[str]):
     tmp = deepcopy(datapoints)
     for datapoint in tmp:
         keys = set(datapoint.keys())
@@ -192,7 +191,7 @@ def verify_vega_props(plot_id, json_result, title, x, y, **kwargs):
     assert plot_y == y
 
 
-def _update_datapoints(datapoints: List, update: Dict):
+def _update_datapoints(datapoints: list, update: dict):
     result = []
     for dp in datapoints:
         tmp = dp.copy()
@@ -501,7 +500,7 @@ def test_repo_with_dvclive_plots(tmp_dir, capsys, repo_with_dvclive_plots):
 
     for s in ("show", "diff"):
         _, json_result, split_json_result = call(capsys, subcommand=s)
-        expected_result: Dict[str, Dict[str, list[str]]] = {
+        expected_result: dict[str, dict[str, list[str]]] = {
             "data": {
                 "dvclive/plots/metrics/metric.tsv": [],
             },

tests/unit/command/test_help.py

@@ -2,7 +2,6 @@ import logging
 import re
 from argparse import SUPPRESS, ArgumentParser
 from itertools import takewhile
-from typing import Tuple
 
 import pytest
 import shtab
@@ -12,10 +11,10 @@ from dvc.cli.parser import get_main_parser
 
 
 def command_tuples():
-    root: Tuple[str, ...] = ()
+    root: tuple[str, ...] = ()
     commands = [root]
 
-    def recurse_parser(parser: ArgumentParser, parents: Tuple[str, ...] = root) -> None:
+    def recurse_parser(parser: ArgumentParser, parents: tuple[str, ...] = root) -> None:
         for positional in parser._get_positional_actions():
             if positional.help != SUPPRESS and isinstance(positional.choices, dict):
                 public_cmds = shtab.get_public_subcommands(positional)

tests/unit/repo/experiments/test_collect.py

@@ -1,6 +1,5 @@
 import datetime
 import random
-from typing import Dict, List
 
 import pytest
 
@@ -22,7 +21,7 @@ def test_collect_stable_sorting(dvc, scm, mocker):
         "7" * 40,
     ]
 
-    def collect_queued_patched(_, baseline_revs) -> Dict[str, List["ExpRange"]]:
+    def collect_queued_patched(_, baseline_revs) -> dict[str, list["ExpRange"]]:
         single_timestamp = datetime.datetime(2023, 6, 20, 0, 0, 0)
 
         exp_ranges = [
@@ -59,8 +58,8 @@ def test_collect_stable_sorting(dvc, scm, mocker):
 
 
 def _assert_experiment_rev_order(
-    actual: List["ExpRange"],
-    expected_revs: List[str],
+    actual: list["ExpRange"],
+    expected_revs: list[str],
 ):
     expected_revs = expected_revs.copy()
 

tests/utils/asserts.py

@@ -1,11 +1,11 @@
-from typing import TYPE_CHECKING, Any, Dict
+from typing import TYPE_CHECKING, Any
 from unittest.mock import ANY
 
 if TYPE_CHECKING:
     from unittest.mock import Mock
 
 
-def issubset(subset: Dict, superset: Dict) -> bool:
+def issubset(subset: dict, superset: dict) -> bool:
     assert superset == {**superset, **subset}
     return True