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

Author: skshetry

.github/workflows/build.yaml

@@ -25,7 +25,7 @@ jobs:
 
     - uses: actions/setup-python@v5
       with:
-        python-version: 3.8
+        python-version: 3.12
 
     - run: python -m pip install --upgrade pip setuptools_scm build twine
 

.github/workflows/tests.yaml

@@ -23,7 +23,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-20.04, windows-latest, macos-latest]
-        pyv: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        pyv: ["3.9", "3.10", "3.11", "3.12"]
 
     steps:
     - uses: actions/checkout@v4

dvc/annotations.py

@@ -1,5 +1,5 @@
 from dataclasses import asdict, dataclass, field, fields
-from typing import Any, ClassVar, Dict, List, Optional
+from typing import Any, ClassVar, Optional
 
 from funcy import compact
 from voluptuous import Required
@@ -14,10 +14,10 @@ class Annotation:
 
     desc: Optional[str] = None
     type: Optional[str] = None
-    labels: List[str] = field(default_factory=list)
-    meta: Dict[str, Any] = field(default_factory=dict)
+    labels: list[str] = field(default_factory=list)
+    meta: dict[str, Any] = field(default_factory=dict)
 
-    def to_dict(self) -> Dict[str, str]:
+    def to_dict(self) -> dict[str, str]:
         return compact(asdict(self))
 
 
@@ -32,10 +32,10 @@ class Artifact:
     path: str
     desc: Optional[str] = None
     type: Optional[str] = None
-    labels: List[str] = field(default_factory=list)
-    meta: Dict[str, Any] = field(default_factory=dict)
+    labels: list[str] = field(default_factory=list)
+    meta: dict[str, Any] = field(default_factory=dict)
 
-    def to_dict(self) -> Dict[str, str]:
+    def to_dict(self) -> dict[str, str]:
         return compact(asdict(self))
 
 
@@ -46,7 +46,7 @@ def to_dict(self) -> Dict[str, str]:
     Annotation.PARAM_LABELS: [str],
     Annotation.PARAM_META: object,
 }
-ARTIFACT_SCHEMA: Dict[Any, Any] = {
+ARTIFACT_SCHEMA: dict[Any, Any] = {
     Required(Artifact.PARAM_PATH): str,
     **ANNOTATION_SCHEMA,  # type: ignore[arg-type]
 }

dvc/api/artifacts.py

@@ -1,4 +1,4 @@
-from typing import Any, Dict, Optional
+from typing import Any, Optional
 
 from dvc.repo import Repo
 
@@ -8,7 +8,7 @@ def artifacts_show(
     version: Optional[str] = None,
     stage: Optional[str] = None,
     repo: Optional[str] = None,
-) -> Dict[str, str]:
+) -> dict[str, str]:
     """
     Return path and Git revision for an artifact in a DVC project.
 
@@ -36,7 +36,7 @@ def artifacts_show(
     if version and stage:
         raise ValueError("Artifact version and stage are mutually exclusive.")
 
-    repo_kwargs: Dict[str, Any] = {
+    repo_kwargs: dict[str, Any] = {
         "subrepos": True,
         "uninitialized": True,
     }

dvc/api/data.py

@@ -1,6 +1,6 @@
 from contextlib import _GeneratorContextManager as GCM
 from contextlib import contextmanager
-from typing import Any, Dict, Optional
+from typing import Any, Optional
 
 from funcy import reraise
 
@@ -39,7 +39,7 @@ def get_url(path, repo=None, rev=None, remote=None):
     from dvc.config import NoRemoteError
     from dvc_data.index import StorageKeyError
 
-    repo_kwargs: Dict[str, Any] = {}
+    repo_kwargs: dict[str, Any] = {}
     if remote:
         repo_kwargs["config"] = {"core": {"remote": remote}}
     with Repo.open(
@@ -74,8 +74,8 @@ def open(  # noqa: A001
     remote: Optional[str] = None,
     mode: str = "r",
     encoding: Optional[str] = None,
-    config: Optional[Dict[str, Any]] = None,
-    remote_config: Optional[Dict[str, Any]] = None,
+    config: Optional[dict[str, Any]] = None,
+    remote_config: Optional[dict[str, Any]] = None,
 ):
     """
     Opens a file tracked in a DVC project.
@@ -233,7 +233,7 @@ def _open(
     config=None,
     remote_config=None,
 ):
-    repo_kwargs: Dict[str, Any] = {
+    repo_kwargs: dict[str, Any] = {
         "subrepos": True,
         "uninitialized": True,
         "remote": remote,

dvc/api/experiments.py

@@ -1,4 +1,4 @@
-from typing import Dict, List, Optional, Union
+from typing import Optional, Union
 
 from rich.text import Text
 
@@ -9,7 +9,7 @@
 def exp_save(
     name: Optional[str] = None,
     force: bool = False,
-    include_untracked: Optional[List[str]] = None,
+    include_untracked: Optional[list[str]] = None,
 ):
     """
     Create a new DVC experiment using `exp save`.
@@ -61,12 +61,12 @@ def _postprocess(exp_rows):
 
 def exp_show(
     repo: Optional[str] = None,
-    revs: Optional[Union[str, List[str]]] = None,
+    revs: Optional[Union[str, list[str]]] = None,
     num: int = 1,
     param_deps: bool = False,
     force: bool = False,
-    config: Optional[Dict] = None,
-) -> List[Dict]:
+    config: Optional[dict] = None,
+) -> list[dict]:
     """Get DVC experiments tracked in `repo`.
 
     Without arguments, this function will retrieve all experiments derived from

dvc/api/scm.py

@@ -1,9 +1,9 @@
-from typing import List, Optional
+from typing import Optional
 
 from dvc.repo import Repo
 
 
-def all_branches(repo: Optional[str] = None) -> List[str]:
+def all_branches(repo: Optional[str] = None) -> list[str]:
     """Get all Git branches in a DVC repository.
 
     Args:
@@ -20,7 +20,7 @@ def all_branches(repo: Optional[str] = None) -> List[str]:
         return _repo.scm.list_branches()
 
 
-def all_commits(repo: Optional[str] = None) -> List[str]:
+def all_commits(repo: Optional[str] = None) -> list[str]:
     """Get all Git commits in a DVC repository.
 
     Args:
@@ -37,7 +37,7 @@ def all_commits(repo: Optional[str] = None) -> List[str]:
         return _repo.scm.list_all_commits()
 
 
-def all_tags(repo: Optional[str] = None) -> List[str]:
+def all_tags(repo: Optional[str] = None) -> list[str]:
     """Get all Git tags in a DVC repository.
 
     Args:

dvc/api/show.py

@@ -1,14 +1,15 @@
 import typing
 from collections import Counter
-from typing import Dict, Iterable, Optional, Union
+from collections.abc import Iterable
+from typing import Optional, Union
 
 from funcy import first
 
 from dvc.repo import Repo
 
 
 def _postprocess(results):
-    processed: Dict[str, Dict] = {}
+    processed: dict[str, dict] = {}
     for rev, rev_data in results.items():
         if not rev_data:
             continue
@@ -36,8 +37,8 @@ def metrics_show(
     *targets: str,
     repo: Optional[str] = None,
     rev: Optional[str] = None,
-    config: Optional[Dict] = None,
-) -> Dict:
+    config: Optional[dict] = None,
+) -> dict:
     """Get metrics tracked in `repo`.
 
     Without arguments, this function will retrieve all metrics from all tracked
@@ -159,8 +160,8 @@ def params_show(
     stages: Optional[Union[str, Iterable[str]]] = None,
     rev: Optional[str] = None,
     deps: bool = False,
-    config: Optional[Dict] = None,
-) -> Dict:
+    config: Optional[dict] = None,
+) -> dict:
     """Get parameters tracked in `repo`.
 
     Without arguments, this function will retrieve all params from all tracked

dvc/cachemgr.py

@@ -1,5 +1,5 @@
 import os
-from typing import TYPE_CHECKING, Optional, Tuple
+from typing import TYPE_CHECKING, Optional
 
 from dvc.fs import GitFileSystem, Schemes
 from dvc_data.hashfile.db import get_odb
@@ -15,7 +15,7 @@ def _get_odb(
     repo,
     settings,
     fs=None,
-    prefix: Optional[Tuple[str, ...]] = None,
+    prefix: Optional[tuple[str, ...]] = None,
     hash_name: Optional[str] = None,
     **kwargs,
 ):

dvc/commands/data.py

@@ -1,4 +1,4 @@
-from typing import TYPE_CHECKING, ClassVar, Dict, Tuple
+from typing import TYPE_CHECKING, ClassVar
 
 from funcy import chunks, compact, log_durations
 
@@ -17,22 +17,22 @@
 
 
 class CmdDataStatus(CmdBase):
-    COLORS: ClassVar[Dict[str, str]] = {
+    COLORS: ClassVar[dict[str, str]] = {
         "not_in_remote": "red",
         "not_in_cache": "red",
         "committed": "green",
         "uncommitted": "yellow",
         "untracked": "cyan",
     }
-    LABELS: ClassVar[Dict[str, str]] = {
+    LABELS: ClassVar[dict[str, str]] = {
         "not_in_remote": "Not in remote",
         "not_in_cache": "Not in cache",
         "committed": "DVC committed changes",
         "uncommitted": "DVC uncommitted changes",
         "untracked": "Untracked files",
         "unchanged": "DVC unchanged files",
     }
-    HINTS: ClassVar[Dict[str, Tuple[str, ...]]] = {
+    HINTS: ClassVar[dict[str, tuple[str, ...]]] = {
         "not_in_remote": ('use "dvc push <file>..." to upload files',),
         "not_in_cache": ('use "dvc fetch <file>..." to download files',),
         "committed": ("git commit the corresponding dvc files to update the repo",),