Date headers by content other than import statements

Import lines copied from unrelated older files made several headers
claim years that none of the file's actual content has. Ignore Python
import statements when finding the earliest surviving content, and
state the rule and the PR template exception in the contribution guide.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: laughingman7743

benchmarks/pyathena_bench/adapters.py

@@ -1,4 +1,4 @@
-# Copyright 2017 The PyAthena authors
+# Copyright 2026 The PyAthena authors
 #
 # Licensed under the MIT License.
 # See LICENSE or https://opensource.org/licenses/MIT.

docs/contributing.md

@@ -132,5 +132,7 @@ Identify any third-party material included in a new contribution and preserve it
 Do not replace upstream notices with the original-file template above.
 
 This policy does not require adding headers to existing files or changing existing notices, including the root `LICENSE`.
-Existing files written solely by the maintainer carry the header above, dated with the year of their earliest surviving content; other existing files keep their current notices.
+Existing non-empty files that contain only the maintainer's original work carry the header above, dated with the year of their earliest surviving content other than import statements.
+The pull request template is an exception because its content is copied into each pull request.
+Other existing files keep their current notices.
 [NOTICE](https://github.com/pyathena-dev/PyAthena/blob/master/NOTICE) acknowledges PyHive's influence on PyAthena.

pyathena/aio/sqlalchemy/base.py

@@ -1,4 +1,4 @@
-# Copyright 2023 The PyAthena authors
+# Copyright 2026 The PyAthena authors
 #
 # Licensed under the MIT License.
 # See LICENSE or https://opensource.org/licenses/MIT.

pyathena/aio/util.py

@@ -1,4 +1,4 @@
-# Copyright 2023 The PyAthena authors
+# Copyright 2025 The PyAthena authors
 #
 # Licensed under the MIT License.
 # See LICENSE or https://opensource.org/licenses/MIT.

pyathena/filesystem/__init__.py

@@ -1,4 +1,4 @@
-# Copyright 2022 The PyAthena authors
+# Copyright 2026 The PyAthena authors
 #
 # Licensed under the MIT License.
 # See LICENSE or https://opensource.org/licenses/MIT.

pyathena/spark/cursor.py

@@ -1,4 +1,4 @@
-# Copyright 2020 The PyAthena authors
+# Copyright 2024 The PyAthena authors
 #
 # Licensed under the MIT License.
 # See LICENSE or https://opensource.org/licenses/MIT.

pyathena/sqlalchemy/map.py

@@ -1,4 +1,4 @@
-# Copyright 2023 The PyAthena authors
+# Copyright 2025 The PyAthena authors
 #
 # Licensed under the MIT License.
 # See LICENSE or https://opensource.org/licenses/MIT.

pyathena/sqlalchemy/struct.py

@@ -1,4 +1,4 @@
-# Copyright 2023 The PyAthena authors
+# Copyright 2025 The PyAthena authors
 #
 # Licensed under the MIT License.
 # See LICENSE or https://opensource.org/licenses/MIT.

scripts/sweep_databases.py

@@ -1,4 +1,4 @@
-# Copyright 2020 The PyAthena authors
+# Copyright 2026 The PyAthena authors
 #
 # Licensed under the MIT License.
 # See LICENSE or https://opensource.org/licenses/MIT.

scripts/tests/test_sweep_databases.py

@@ -1,4 +1,4 @@
-# Copyright 2020 The PyAthena authors
+# Copyright 2026 The PyAthena authors
 #
 # Licensed under the MIT License.
 # See LICENSE or https://opensource.org/licenses/MIT.