diff --git a/db_dtypes/__init__.py b/db_dtypes/__init__.py
index 54721a3..ad4ea33 100644
--- a/db_dtypes/__init__.py
+++ b/db_dtypes/__init__.py
@@ -27,10 +27,8 @@
 import pyarrow
 import pyarrow.compute
 
-
-from db_dtypes.version import __version__
 from db_dtypes import core
-
+from db_dtypes.version import __version__
 
 date_dtype_name = "dbdate"
 time_dtype_name = "dbtime"
diff --git a/db_dtypes/core.py b/db_dtypes/core.py
index 567b931..7c9eb6b 100644
--- a/db_dtypes/core.py
+++ b/db_dtypes/core.py
@@ -21,7 +21,6 @@
 
 from db_dtypes import pandas_backports
 
-
 pandas_release = pandas_backports.pandas_release
 
 
diff --git a/db_dtypes/pandas_backports.py b/db_dtypes/pandas_backports.py
index 0966e83..e3aea17 100644
--- a/db_dtypes/pandas_backports.py
+++ b/db_dtypes/pandas_backports.py
@@ -29,7 +29,6 @@
 import pandas.compat.numpy.function
 import pandas.core.nanops
 
-
 pandas_release = packaging.version.parse(pandas.__version__).release
 
 # Create aliases for private methods in case they move in a future version.
diff --git a/noxfile.py b/noxfile.py
index 102670a..d6735da 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -21,7 +21,6 @@
 import os
 import pathlib
 import re
-import re
 import shutil
 from typing import Dict, List
 import warnings
diff --git a/samples/snippets/pandas_date_and_time.py b/samples/snippets/pandas_date_and_time.py
index 3292e6c..b6e5581 100644
--- a/samples/snippets/pandas_date_and_time.py
+++ b/samples/snippets/pandas_date_and_time.py
@@ -17,7 +17,9 @@ def pandas_date_and_time():
     # [START bigquery_pandas_date_create]
 
     import datetime
+
     import pandas as pd
+
     import db_dtypes  # noqa import to register dtypes
 
     dates = pd.Series([datetime.date(2021, 9, 17), "2021-9-18"], dtype="dbdate")
diff --git a/setup.py b/setup.py
index e91b109..276a940 100644
--- a/setup.py
+++ b/setup.py
@@ -15,6 +15,7 @@
 import io
 import os
 import re
+
 from setuptools import setup
 
 # Package metadata.
diff --git a/tests/compliance/date/test_date_compliance.py b/tests/compliance/date/test_date_compliance.py
index 5c43287..038005a 100644
--- a/tests/compliance/date/test_date_compliance.py
+++ b/tests/compliance/date/test_date_compliance.py
@@ -21,13 +21,12 @@
 """
 
 import pandas
-from pandas.tests.extension import base
 import pandas._testing as tm
+from pandas.tests.extension import base
 import pytest
 
 import db_dtypes
 
-
 # TODO(https://github.com/googleapis/python-db-dtypes-pandas/issues/87): Add
 # compliance tests for arithmetic operations.
 
diff --git a/tests/compliance/time/test_time_compliance.py b/tests/compliance/time/test_time_compliance.py
index 3b36d16..f894ba5 100644
--- a/tests/compliance/time/test_time_compliance.py
+++ b/tests/compliance/time/test_time_compliance.py
@@ -21,13 +21,12 @@
 """
 
 import pandas
-from pandas.tests.extension import base
 import pandas._testing as tm
+from pandas.tests.extension import base
 import pytest
 
 import db_dtypes
 
-
 # TODO(https://github.com/googleapis/python-db-dtypes-pandas/issues/87): Add
 # compliance tests for arithmetic operations.
 
diff --git a/tests/unit/test_arrow.py b/tests/unit/test_arrow.py
index 56bbd01..a7a38a2 100644
--- a/tests/unit/test_arrow.py
+++ b/tests/unit/test_arrow.py
@@ -23,7 +23,6 @@
 
 import db_dtypes
 
-
 SECOND_NANOS = 1_000_000_000
 MINUTE_NANOS = 60 * SECOND_NANOS
 HOUR_NANOS = 60 * MINUTE_NANOS
diff --git a/tests/unit/test_date.py b/tests/unit/test_date.py
index fddf1a0..9dbc6d9 100644
--- a/tests/unit/test_date.py
+++ b/tests/unit/test_date.py
@@ -25,7 +25,6 @@
 import db_dtypes
 from db_dtypes import pandas_backports
 
-
 VALUE_PARSING_TEST_CASES = [
     # Min/Max values for pandas.Timestamp.
     ("1677-09-22", datetime.date(1677, 9, 22)),