drop usage of pytz in tests; add pytz to constraints as a dependency of pandas

Author: parthea

.librarian/generator-input/client-post-processing/bigquery-storage-integration.yaml

@@ -461,6 +461,8 @@ replacements:
       google-api-core==1.34.1
       libcst==0.2.5
       fastavro==0.21.2
+      # pytz is required by pandas
+      pytz
       pandas==1.0.5
       pyarrow==0.15.0
       google-auth==2.14.1

packages/google-cloud-bigquery-storage/tests/system/reader/test_reader.py

@@ -22,7 +22,6 @@
 import uuid
 
 import pytest
-import pytz
 
 from google.cloud import bigquery
 
@@ -451,7 +450,7 @@ def test_decoding_data_types(
         "bool_field": True,
         "geography_field": "POINT(-49.3028 69.0622)",
         "person_struct_field": {"name": "John", "age": 42},
-        "timestamp_field": dt.datetime(2019, 8, 9, 13, 38, 22, 17896, tzinfo=pytz.UTC),
+        "timestamp_field": dt.datetime(2019, 8, 9, 13, 38, 22, 17896, tzinfo=dt.timezone.utc),
         "date_field": dt.date(1995, 3, 17),
         "time_field": dt.time(16, 24, 51),
         "string_array_field": ["foo", "bar", "baz"],

packages/google-cloud-bigquery-storage/tests/unit/helpers.py

@@ -17,8 +17,6 @@
 import datetime
 import decimal
 
-import pytz
-
 SCALAR_COLUMNS = [
     {"name": "int_col", "type": "int64"},
     {"name": "float_col", "type": "float64"},
@@ -42,7 +40,7 @@
             "bytes_col": b"ascii bytes",
             "date_col": datetime.date(1998, 9, 4),
             "time_col": datetime.time(12, 0),
-            "ts_col": datetime.datetime(2000, 1, 1, 5, 0, tzinfo=pytz.utc),
+            "ts_col": datetime.datetime(2000, 1, 1, 5, 0, tzinfo=datetime.timezone.utc),
         },
         {
             "int_col": 456,
@@ -53,7 +51,7 @@
             "bytes_col": b"\xbb\xee\xff",
             "date_col": datetime.date(1995, 3, 2),
             "time_col": datetime.time(13, 37),
-            "ts_col": datetime.datetime(1965, 4, 3, 2, 1, tzinfo=pytz.utc),
+            "ts_col": datetime.datetime(1965, 4, 3, 2, 1, tzinfo=datetime.timezone.utc),
         },
     ],
     [
@@ -66,7 +64,7 @@
             "bytes_col": b"\x54\x69\x6d",
             "date_col": datetime.date(1970, 1, 1),
             "time_col": datetime.time(16, 20),
-            "ts_col": datetime.datetime(1991, 8, 25, 20, 57, 8, tzinfo=pytz.utc),
+            "ts_col": datetime.datetime(1991, 8, 25, 20, 57, 8, tzinfo=datetime.timezone.utc),
         }
     ],
 ]