add python EOL notice

sdk/RELEASE.md

@@ -6,6 +6,7 @@
 * Support collecting outputs from conditional branches using `dsl.OneOf` [\#10067](https://github.com/kubeflow/pipelines/pull/10067)
 
 ## Deprecations
+* Add notice of Python 3.7 support removal on April 23, 2024 [\#10139](https://github.com/kubeflow/pipelines/pull/10139)
 
 ## Bug fixes and other changes
 * Fix type on `dsl.ParallelFor` sub-DAG output when a `dsl.Collected` is used. Non-functional fix. [\#10069](https://github.com/kubeflow/pipelines/pull/10069)

sdk/python/kfp/__init__.py

@@ -18,6 +18,17 @@
 
 __version__ = '2.3.0'
 
+import sys
+import warnings
+
+if sys.version_info < (3, 8):
+    warnings.warn(
+        ('Python 3.7 has reached end-of-life. KFP will drop support for Python 3.7 on April 23, 2024. To use new versions of the KFP SDK after that date, you will need to upgrade to Python >= 3.8. See https://devguide.python.org/versions/ for more details.'
+        ),
+        FutureWarning,
+        stacklevel=2,
+    )
+
 TYPE_CHECK = True
 
 import os

sdk/python/kfp/dsl/component_factory.py

@@ -532,6 +532,12 @@ def create_component_from_func(
     args = []
     if base_image is None:
         base_image = _DEFAULT_BASE_IMAGE
+        warnings.warn(
+            ("Python 3.7 has reached end-of-life. The default base_image used by the @dsl.component decorator will switch from 'python:3.7' to 'python:3.8' on April 23, 2024. To ensure your existing components work with versions of the KFP SDK released after that date, you should provide an explicit base_image argument and ensure your code works as intended on Python 3.8."
+            ),
+            FutureWarning,
+            stacklevel=2,
+        )
 
     component_image = base_image
 

sdk/python/kfp/dsl/component_factory_test.py

@@ -287,5 +287,19 @@ def comp(output_list: Output[List[Artifact]]):
                 return dsl.ContainerSpec(image='alpine')
 
 
+class TestPythonEOLWarning(unittest.TestCase):
+
+    def test_default_base_image(self):
+
+        with self.assertWarnsRegex(
+                FutureWarning,
+                r"Python 3\.7 has reached end-of-life\. The default base_image used by the @dsl\.component decorator will switch from 'python:3\.7' to 'python:3\.8' on April 23, 2024\. To ensure your existing components work with versions of the KFP SDK released after that date, you should provide an explicit base_image argument and ensure your component works as intended on Python 3\.8\."
+        ):
+
+            @dsl.component
+            def foo():
+                pass
+
+
 if __name__ == '__main__':
     unittest.main()

sdk/python/kfp/init_test.py

@@ -0,0 +1,34 @@
+# Copyright 2023 The Kubeflow Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import sys
+import unittest
+
+
+class TestPythonEOLWarning(unittest.TestCase):
+
+    def test(self):
+        # remove module if it is already loaded
+        if 'kfp' in sys.modules:
+            del sys.modules['kfp']
+
+        with self.assertWarnsRegex(
+                FutureWarning,
+                r'Python 3\.7 has reached end-of-life\. KFP will drop support for Python 3\.7 on April 23, 2024\. To use new versions of the KFP SDK after that date, you will need to upgrade to Python >= 3\.8\. See https:\/\/devguide\.python\.org\/versions\/ for more details\.'
+        ):
+            import kfp  # noqa
+
+
+if __name__ == '__main__':
+    unittest.main()