Revise typing for min Python 3.10

Revisions to typing to benefit from bumping minimum
supported Python version to 3.10.

Removes now superfluous `from __future__ import annotations`
lines and corrects typing syntax errors.

etc/factory_bounds.py

@@ -9,8 +9,6 @@
 Module retained in case might be useful.
 """
 
-from __future__ import annotations
-
 import abc
 import dataclasses
 import pathlib

exchange_calendars/calendar_helpers.py

@@ -2,16 +2,15 @@
 
 import contextlib
 import datetime
-import typing
-from typing import Literal
+from typing import Literal, TYPE_CHECKING
 from zoneinfo import ZoneInfo
 
 import numpy as np
 import pandas as pd
 
 from exchange_calendars import errors
 
-if typing.TYPE_CHECKING:
+if TYPE_CHECKING:
     from exchange_calendars import ExchangeCalendar
 
 UTC = ZoneInfo("UTC")
@@ -22,15 +21,15 @@
 
 # Use Date type where input does not need to represent an actual session
 # and will be parsed by parse_date.
-Date = typing.Union[pd.Timestamp, str, int, float, datetime.datetime]
+Date = pd.Timestamp | str | int | float | datetime.datetime
 
 # Use Session type where input should represent an actual session and will
 # be parsed by parse_session.
 Session = Date
 
 # Use Minute type where input does not need to represent an actual trading
 # minute and will be parsed by parse_timestamp.
-Minute = typing.Union[pd.Timestamp, str, int, float, datetime.datetime]
+Minute = pd.Timestamp | str | int | float | datetime.datetime
 
 # Use TradingMinute where input should represent a trading minute and will
 # be parsed by parse_trading_minute.

exchange_calendars/calendar_utils.py

@@ -1,5 +1,3 @@
-from __future__ import annotations
-
 from typing import Literal
 
 from .calendar_helpers import parse_date, Date

exchange_calendars/errors.py

@@ -12,7 +12,9 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
 from __future__ import annotations
+
 import typing
 import pandas as pd
 

exchange_calendars/exchange_calendar_xbud.py

@@ -13,7 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from __future__ import annotations
 
 import datetime
 from zoneinfo import ZoneInfo

exchange_calendars/exchange_calendar_xbue.py

@@ -13,7 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from __future__ import annotations
 
 import datetime
 from itertools import chain

exchange_calendars/exchange_calendar_xkrx.py

@@ -12,7 +12,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-from __future__ import annotations
+
 
 from datetime import time
 import functools

exchange_calendars/exchange_calendar_xmos.py

@@ -13,7 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from __future__ import annotations
 
 import datetime
 from itertools import chain

exchange_calendars/exchange_calendar_xphs.py

@@ -13,7 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from __future__ import annotations
 
 import datetime
 from itertools import chain

exchange_calendars/exchange_calendar_xsgo.py

@@ -13,7 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from __future__ import annotations
 
 import datetime
 from zoneinfo import ZoneInfo

exchange_calendars/exchange_calendar_xtai.py

@@ -13,7 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from __future__ import annotations
 
 import datetime
 from itertools import chain

exchange_calendars/exchange_calendar_xwar.py

@@ -13,7 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from __future__ import annotations
 
 import datetime
 from zoneinfo import ZoneInfo

exchange_calendars/precomputed_exchange_calendar.py

@@ -1,4 +1,3 @@
-from __future__ import annotations
 from abc import abstractmethod
 
 import numpy as np

exchange_calendars/utils/pandas_utils.py

@@ -1,5 +1,3 @@
-from __future__ import annotations
-
 import datetime
 from zoneinfo import ZoneInfo
 

exchange_calendars/xbkk_holidays.py

@@ -1,5 +1,3 @@
-from __future__ import annotations
-
 import datetime
 
 import pandas as pd

tests/test_calendar_helpers.py

@@ -1,7 +1,5 @@
 """Tests for calendar_helpers module."""
 
-from __future__ import annotations
-
 from collections import abc
 import datetime
 from datetime import time

tests/test_exchange_calendar.py

@@ -9,7 +9,6 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-from __future__ import annotations
 
 from collections import abc
 from datetime import time
@@ -722,7 +721,7 @@ def _get_sessions_with_times_different_to_next_session(
 
         Returns
         -------
-        list of pd.Datetimeindex
+        list of pd.DatetimeIndex
             [0] sessions with earlier next session
             [1] sessions with later next session
         """
@@ -1117,12 +1116,12 @@ def non_sessions(self) -> pd.DatetimeIndex:
     @property
     def sessions_range_defined_by_non_sessions(
         self,
-    ) -> tuple[tuple[pd.Timestamp, pd.Timestamp], pd.Datetimeindex] | None:
+    ) -> tuple[tuple[pd.Timestamp, pd.Timestamp], pd.DatetimeIndex] | None:
         """Range containing sessions although defined with non-sessions.
 
         Returns
         -------
-        tuple[tuple[pd.Timestamp, pd.Timestamp], pd.Datetimeindex]:
+        tuple[tuple[pd.Timestamp, pd.Timestamp], pd.DatetimeIndex]:
             [0] tuple[pd.Timestamp, pd.Timestamp]:
                 [0] range start as non-session date.
                 [1] range end as non-session date.
@@ -1869,7 +1868,7 @@ def early_closes_sample_time(self) -> abc.Iterator[pd.Timedelta | None]:
         yield None
 
     @pytest.fixture
-    def early_closes_weekdays(self) -> abc.Iterator[tuple(int)]:
+    def early_closes_weekdays(self) -> abc.Iterator[tuple[int]]:
         """Weekdays with non-standard close times.
 
         `test_early_closes_weekdays` will check that all sessions on these