TIMESTAMP->dt: Use backports.zoneinfo on Python<3.9

docs/query.rst

@@ -291,7 +291,11 @@ Let's exercise all of them.
  >>> ccursor.fetchone()
  ['foo', datetime.datetime(2022, 7, 19, 4, 10, 36, 758000, tzinfo=<DstTzInfo 'Australia/Sydney' AEST+10:00:00 STD>)]
 
- >>> import zoneinfo
+ >>> try:
+ ... import zoneinfo
+ ... except ModuleNotFoundError:
+ ... from backports import zoneinfo
+
  >>> ccursor.time_zone = zoneinfo.ZoneInfo("Australia/Sydney")
  >>> ccursor.execute("SELECT datetime_tz FROM locations ORDER BY name")
  >>> ccursor.fetchone()

setup.py

@@ -65,7 +65,8 @@ def read(path):
  },
  extras_require=dict(
  sqlalchemy=['sqlalchemy>=1.0,<1.5',
- 'geojson>=2.5.0'],
+ 'geojson>=2.5.0',
+ 'backports.zoneinfo<1; python_version<"3.9"'],
  test=['tox>=3,<4',
  'zope.testing>=4,<5',
  'zope.testrunner>=5,<6',

src/crate/client/doctests/cursor.txt

@@ -415,11 +415,18 @@ Let's exercise all of them::
  >>> cursor.fetchone()
  ['foo', datetime.datetime(2022, 7, 19, 4, 10, 36, 758000, tzinfo=<DstTzInfo 'Australia/Sydney' AEST+10:00:00 STD>)]
 
- >>> import zoneinfo
+ >>> try:
+ ... import zoneinfo
+ ... except ModuleNotFoundError:
+ ... from backports import zoneinfo
  >>> cursor.time_zone = zoneinfo.ZoneInfo("Australia/Sydney")
  >>> cursor.execute('')
- >>> cursor.fetchone()
- ['foo', datetime.datetime(2022, 7, 19, 4, 10, 36, 758000, tzinfo=zoneinfo.ZoneInfo(key='Australia/Sydney'))]
+ >>> record = cursor.fetchone()
+ >>> record
+ ['foo', datetime.datetime(2022, 7, 19, 4, 10, 36, 758000, ...zoneinfo.ZoneInfo(key='Australia/Sydney'))]
+
+ >>> record[1].tzname()
+ 'AEST'
 
  >>> cursor.time_zone = "+0530"
  >>> cursor.execute('')

src/crate/client/test_cursor.py

@@ -20,10 +20,13 @@
 # software solely pursuant to the terms of the relevant commercial agreement.
 
 import datetime
-import zoneinfo
 from ipaddress import IPv4Address
 from unittest import TestCase
 from unittest.mock import MagicMock
+try:
+ import zoneinfo
+except ModuleNotFoundError:
+ from backports import zoneinfo
 
 import pytz