jorisvandenbossche commented on a change in pull request #12421:
URL: https://github.com/apache/arrow/pull/12421#discussion_r809251404



##########
File path: cpp/src/arrow/python/datetime.cc
##########
@@ -427,6 +427,8 @@ Result<PyObject*> StringToTzinfo(const std::string& tz) {
 Result<std::string> TzinfoToString(PyObject* tzinfo) {
   OwnedRef module_pytz;        // import pytz
   OwnedRef module_datetime;    // import datetime
+  OwnedRef module_zoneinfo;    // import zoneinfo
+  OwnedRef module_dateutil;    // import dateutil

Review comment:
       Since you removed the imports, I think you can remove those declarations 
as well (they are not used now?)

##########
File path: python/pyarrow/tests/test_types.py
##########
@@ -297,12 +298,23 @@ def test_is_primitive():
     (pytz.timezone('Etc/GMT-9'), 'Etc/GMT-9'),
     (pytz.FixedOffset(180), '+03:00'),
     (datetime.timezone.utc, 'UTC'),
-    (datetime.timezone(datetime.timedelta(hours=1, minutes=30)), '+01:30')
+    (datetime.timezone(datetime.timedelta(hours=1, minutes=30)), '+01:30'),
+    (dateutil.tz.gettz('Europe/Brussels'), 'Europe/Brussels'),
+    (dateutil.tz.UTC, 'UTC')

Review comment:
       Can you also split the dateutil test in its own test, done similarly as 
the zoneinfo one? Strictly speaking also dateutil is an optional dependency




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