general: switch to using native 3.8 versions for cached_property/Literal/Protocol instead of compat

my/coding/codeforces.py

@@ -3,13 +3,12 @@ from my.config import codeforces as config  # type: ignore[attr-defined]
 
 
 from datetime import datetime, timezone
-from typing import NamedTuple
+from functools import cached_property
 import json
-from typing import Dict, Iterator
+from typing import NamedTuple, Dict, Iterator
 
 
 from ..core import get_files, Res, unwrap
-from ..core.compat import cached_property
 from ..core.konsume import ignore, wrap
 
 

my/coding/topcoder.py

@@ -3,13 +3,12 @@ from my.config import topcoder as config  # type: ignore[attr-defined]
 
 
 from datetime import datetime
-from typing import NamedTuple
+from functools import cached_property
 import json
-from typing import Dict, Iterator
+from typing import NamedTuple, Dict, Iterator
 
 
 from ..core import get_files, Res, unwrap, Json
-from ..core.compat import cached_property
 from ..core.error import Res, unwrap
 from ..core.konsume import zoom, wrap, ignore
 

my/config.py

@@ -98,7 +98,7 @@ class location:
         accuracy: float = 100
 
 
-from my.core.compat import Literal
+from typing import Literal
 class time:
     class tz:
         policy: Literal['keep', 'convert', 'throw']

my/core/common.py

@@ -366,10 +366,6 @@ def isoparse(s: str) -> tzdatetime:
     return datetime.fromisoformat(s)
 
 
-# legacy import -- we should use compat directly instead
-from .compat import Literal
-
-
 import re
 # https://stackoverflow.com/a/295466/706389
 def get_valid_filename(s: str) -> str:
@@ -664,5 +660,7 @@ def assert_never(value: NoReturn) -> NoReturn:
     assert False, f'Unhandled value: {value} ({type(value).__name__})'
 
 
-# legacy deprecated import
-from .compat import cached_property as cproperty
+## legacy imports, keeping them here for backwards compatibility
+from functools import cached_property as cproperty
+from typing import Literal
+## 

my/core/compat.py

@@ -3,6 +3,7 @@ Some backwards compatibility stuff/deprecation helpers
 '''
 import sys
 from types import ModuleType
+from typing import TYPE_CHECKING
 
 from . import warnings
 from .common import LazyLogger
@@ -53,20 +54,10 @@ import os
 windows = os.name == 'nt'
 
 
+# keeping just for backwards compatibility, used to have compat implementation for 3.6
 import sqlite3
 def sqlite_backup(*, source: sqlite3.Connection, dest: sqlite3.Connection, **kwargs) -> None:
-    if sys.version_info[:2] >= (3, 7):
     source.backup(dest, **kwargs)
-    else:
-        # https://stackoverflow.com/a/10856450/706389
-        import io
-        tempfile = io.StringIO()
-        for line in source.iterdump():
-            tempfile.write('%s\n' % line)
-        tempfile.seek(0)
-
-        dest.cursor().executescript(tempfile.read())
-        dest.commit()
 
 
 # can remove after python3.9
@@ -76,55 +67,10 @@ def removeprefix(text: str, prefix: str) -> str:
     return text
 
 
-# can remove after python3.8
-if sys.version_info[:2] >= (3, 8):
+## used to have compat function before 3.8 for these
 from functools import cached_property
-else:
-    from typing import TypeVar, Callable
-    Cl = TypeVar('Cl')
-    R = TypeVar('R')
-
-    def cached_property(f: Callable[[Cl], R]) -> R:
-        import functools
-        return property(functools.lru_cache(maxsize=1)(f))
-    del Cl
-    del R
-
-
-from typing import TYPE_CHECKING
-
-
-if sys.version_info[:2] >= (3, 8):
-    from typing import Literal
-else:
-    if TYPE_CHECKING:
-        from typing_extensions import Literal
-    else:
-        # erm.. I guess as long as it's not crashing, whatever...
-        class _Literal:
-            def __getitem__(self, args):
-                pass
-        Literal = _Literal()
-
-
-if sys.version_info[:2] >= (3, 8):
-    from typing import Protocol
-else:
-    if TYPE_CHECKING:
-        from typing_extensions import Protocol
-    else:
-        # todo could also use NamedTuple?
-        Protocol = object
-
-
-if sys.version_info[:2] >= (3, 8):
-    from typing import TypedDict
-else:
-    if TYPE_CHECKING:
-        from typing_extensions import TypedDict
-    else:
-        from typing import Dict
-        TypedDict = Dict
+from typing import Literal, Protocol, TypedDict
+##
 
 
 if sys.version_info[:2] >= (3, 10):

my/core/dataset.py

@@ -2,11 +2,10 @@ from __future__ import annotations
 from .common import assert_subpackage; assert_subpackage(__name__)
 
 from .common import PathIsh
-from .compat import Protocol
 from .sqlite import sqlite_connect_immutable
 
 ## sadly dataset doesn't have any type definitions
-from typing import Iterable, Iterator, Dict, Optional, Any
+from typing import Iterable, Iterator, Dict, Optional, Any, Protocol
 from contextlib import AbstractContextManager
 
 

my/core/error.py

@@ -4,9 +4,7 @@ See https://beepb00p.xyz/mypy-error-handling.html#kiss for more detail
 """
 
 from itertools import tee
-from typing import Union, TypeVar, Iterable, List, Tuple, Type, Optional, Callable, Any, cast, Iterator
-
-from .compat import Literal
+from typing import Union, TypeVar, Iterable, List, Tuple, Type, Optional, Callable, Any, cast, Iterator, Literal
 
 
 T = TypeVar('T')

my/core/pandas.py

@@ -5,7 +5,7 @@ Various pandas helpers and convenience functions
 # NOTE: this file is meant to be importable without Pandas installed
 from datetime import datetime
 from pprint import pformat
-from typing import Optional, TYPE_CHECKING, Any, Iterable, Type, Dict
+from typing import Optional, TYPE_CHECKING, Any, Iterable, Type, Dict, Literal
 from . import warnings, Res
 from .common import LazyLogger, Json, asdict
 
@@ -45,8 +45,6 @@ def check_dateish(s) -> Iterable[str]:
     '''.strip()
 
 
-from .compat import Literal
-
 ErrorColPolicy = Literal[
     'add_if_missing', # add error column if it's missing
     'warn'          , # warn, but do not modify

my/core/sqlite.py

@@ -6,11 +6,10 @@ from pathlib import Path
 import shutil
 import sqlite3
 from tempfile import TemporaryDirectory
-from typing import Tuple, Any, Iterator, Callable, Optional, Union
+from typing import Tuple, Any, Iterator, Callable, Optional, Union, Literal
 
 
 from .common import PathIsh, assert_never
-from .compat import Literal
 
 
 def sqlite_connect_immutable(db: PathIsh) -> sqlite3.Connection:
@@ -86,8 +85,7 @@ def sqlite_copy_and_open(db: PathIsh) -> sqlite3.Connection:
         for p in tocopy:
             shutil.copy(p, tdir / p.name)
         with sqlite3.connect(str(tdir / dp.name)) as conn:
-            from .compat import sqlite_backup
-            sqlite_backup(source=conn, dest=dest)
+            conn.backup(target=dest)
         conn.close()
     return dest
 

my/fbmessenger/common.py

@@ -1,8 +1,7 @@
 from my.core import __NOT_HPI_MODULE__
 
-from typing import Iterator, Optional
+from typing import Iterator, Optional, Protocol
 
-from my.core.compat import Protocol
 from my.core import datetime_aware
 
 

my/instagram/common.py

@@ -1,10 +1,9 @@
 from dataclasses import replace
 from datetime import datetime
 from itertools import chain
-from typing import Iterator, Dict, Any
+from typing import Iterator, Dict, Any, Protocol
 
 from my.core import warn_if_empty, Res
-from my.core.compat import Protocol
 
 
 class User(Protocol):

my/location/common.py

@@ -1,9 +1,8 @@
 from datetime import date, datetime
-from typing import Union, Tuple, Optional, Iterable, TextIO, Iterator
+from typing import Union, Tuple, Optional, Iterable, TextIO, Iterator, Protocol
 from dataclasses import dataclass
 
 from my.core import __NOT_HPI_MODULE__
-from my.core.compat import Protocol
 
 DateIsh = Union[datetime, date, str]
 

my/location/fallback/via_home.py

@@ -73,7 +73,7 @@ def get_location(dt: datetime) -> LatLon:
     return loc[0].lat, loc[0].lon
 
 
-# TODO: in python3.9, use functools.cached_property instead?
+# TODO: in python3.8, use functools.cached_property instead?
 @lru_cache(maxsize=None)
 def homes_cached() -> List[Tuple[datetime, LatLon]]:
     return list(config._history)

my/reddit/common.py

@@ -4,10 +4,9 @@ type of shared models have a standardized interface
 """
 from my.core import __NOT_HPI_MODULE__
 
-from typing import Set, Iterator
+from typing import Set, Iterator, Protocol
 from itertools import chain
 
-from my.core.compat import Protocol
 from my.core import datetime_aware, Json
 
 

my/rtm.py

@@ -6,12 +6,12 @@ REQUIRES = [
     'icalendar',
 ]
 
+from datetime import datetime
+from functools import cached_property
 import re
 from typing import Dict, List, Iterator
-from datetime import datetime
 
 from .core.common import LazyLogger, get_files, group_by_key, make_dict
-from .core.compat import cached_property
 
 from my.config import rtm as config
 

my/twitter/archive.py

@@ -22,9 +22,9 @@ except ImportError as ie:
 
 
 from dataclasses import dataclass
+from functools import cached_property
 import html
 from ..core.common import Paths, datetime_aware
-from ..core.compat import cached_property
 from ..core.error import Res
 from ..core.kompress import ZipPath