chore: Set Python 3.9 as the Minimum Supported Version

.github/workflows/backend-visualization.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.8'
+          python-version: '3.9'
 
       - name: Run tests
         run: ./test/presubmit-backend-visualization.sh

.github/workflows/kfp-kubernetes-library-test.yml

@@ -17,7 +17,6 @@ jobs:
     strategy:
       matrix:
         python: [
-          { 'version': '3.8' },
           { 'version': '3.9' },
           { 'version': '3.10' },
           { 'version': '3.11' },

.github/workflows/kfp-sdk-runtime-tests.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-24.04
     strategy:
       matrix:
-        python: ['3.8', '3.9', '3.10', '3.11', '3.12']
+        python: ['3.9', '3.10', '3.11', '3.12']
     steps:
       - name: Checkout code
         uses: actions/checkout@v4

.github/workflows/kfp-sdk-tests.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8, 3.9, 3.10, 3.11, 3.12]
+        python-version: [3.9, 3.10, 3.11, 3.12]
 
     steps:
     - name: Checkout code

.github/workflows/kubeflow-pipelines-integration-v2.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8]
+        python-version: [3.9]
 
     steps:
       - name: Checkout code

.github/workflows/sdk-component-yaml.yml

@@ -22,7 +22,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: 3.8
+          python-version: 3.9
 
       - name: apt-get update
         run: sudo apt-get update

.github/workflows/sdk-docformatter.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: 3.8
+          python-version: 3.9
 
       - name: Run docformatter tests
         run: ./test/presubmit-docformatter-sdk.sh

.github/workflows/sdk-isort.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: 3.8
+          python-version: 3.9
 
       - name: Run isort tests
         run: ./test/presubmit-isort-sdk.sh

.github/workflows/sdk-upgrade.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: 3.8
+          python-version: 3.9
 
       - name: Run SDK upgrade tests
         run: ./test/presubmit-test-sdk-upgrade.sh

.github/workflows/sdk-yapf.yml

@@ -27,7 +27,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v4
       with:
-        python-version: '3.8'
+        python-version: '3.9'
 
     - name: Install dependencies
       run: pip install yapf

.readthedocs.yml

@@ -8,4 +8,4 @@ python:
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.8"
+    python: "3.9"

RELEASE.md

@@ -291,7 +291,7 @@ fill in the description. Detailed steps:
        <pre>
        To deploy Kubeflow Pipelines in an existing cluster, follow the instruction in [here](https://www.kubeflow.org/docs/pipelines/standalone-deployment-gcp/) or via UI [here](https://console.cloud.google.com/ai-platform/pipelines)
 
-       Install python SDK (python 3.7 above) by running:
+       Install python SDK (python 3.9 above) by running:
 
        ```bash
        python3 -m pip install kfp kfp-server-api --upgrade
@@ -306,7 +306,7 @@ fill in the description. Detailed steps:
        <pre>
         To deploy Kubeflow Pipelines in an existing cluster, follow the instruction in [here](https://www.kubeflow.org/docs/pipelines/standalone-deployment-gcp/).
 
-        Install kfp-server-api package (python 3.7 above) by running:
+        Install kfp-server-api package (python 3.9 above) by running:
 
         ```bash
         python3 -m pip install kfp-server-api==$VERSION --upgrade

api/v2alpha1/python/setup.py

@@ -25,7 +25,7 @@
     author_email='[email protected]',
     url='https://github.com/kubeflow/pipelines',
     packages=setuptools.find_namespace_packages(include=['kfp.*']),
-    python_requires='>=3.7.0,<3.13.0',
+    python_requires='>=3.9.0,<3.13.0',
     install_requires=['protobuf>=4.21.1,<5'],
     include_package_data=True,
     license='Apache 2.0',

backend/Dockerfile

@@ -27,7 +27,7 @@ RUN go-licenses csv ./backend/src/apiserver > /tmp/licenses.csv && \
   go-licenses save ./backend/src/apiserver --save_path /tmp/NOTICES
 
 # 2. Compile preloaded pipeline samples
-FROM python:3.8 as compiler
+FROM python:3.9 as compiler
 RUN apt-get update -y && apt-get install --no-install-recommends -y -q default-jdk python3-setuptools python3-dev jq
 RUN wget https://bootstrap.pypa.io/get-pip.py && python3 get-pip.py
 COPY backend/requirements.txt .

backend/Dockerfile.conformance

@@ -34,7 +34,7 @@ RUN chmod +x /test/integration/run.sh
 RUN tar -czvf /test.tar.gz /test
 
 
-FROM alpine:3.8
+FROM alpine:3.9
 
 COPY --from=builder /test.tar.gz /
 RUN tar -xzvf /test.tar.gz

backend/metadata_writer/Dockerfile

@@ -1,5 +1,5 @@
 # ml-metadata package depends on tensorflow package
-FROM python:3.8
+FROM python:3.9
 COPY backend/metadata_writer/requirements.txt /kfp/metadata_writer/
 RUN python3 -m pip install -r /kfp/metadata_writer/requirements.txt
 

backend/metadata_writer/requirements.txt

@@ -1,5 +1,5 @@
 #
-# This file is autogenerated by pip-compile with Python 3.8
+# This file is autogenerated by pip-compile with Python 3.9
 # by the following command:
 #
 #    pip-compile --output-file=- -

backend/metadata_writer/update_requirements.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
 
 # This image should be in sync with Dockerfile.
-IMAGE="python:3.8"
+IMAGE="python:3.9"
 ../../hack/update-requirements.sh $IMAGE <requirements.in >requirements.txt

backend/src/apiserver/resource/resource_manager_test.go

@@ -3512,15 +3512,15 @@ spec:
       - name: ENABLE_CACHING
         valueFrom:
           fieldRef: {fieldPath: 'metadata.labels[''pipelines.kubeflow.org/enable_caching'']'}
-      - {name: KFP_V2_IMAGE, value: 'python:3.7'}
+      - {name: KFP_V2_IMAGE, value: 'python:3.9'}
       - {name: KFP_V2_RUNTIME_INFO, value: '{"inputParameters": {"num_steps": {"type":
           "INT"}}, "inputArtifacts": {"dataset": {"metadataPath": "/tmp/inputs/dataset/data",
           "schemaTitle": "system.Dataset", "instanceSchema": ""}}, "outputParameters":
           {}, "outputArtifacts": {"model": {"schemaTitle": "system.Model", "instanceSchema":
           "", "metadataPath": "/tmp/outputs/model/data"}}}'}
       envFrom:
       - configMapRef: {name: metadata-grpc-configmap, optional: true}
-      image: python:3.7
+      image: python:3.9
       volumeMounts:
       - {mountPath: /kfp-launcher, name: kfp-launcher}
     inputs:
@@ -4044,7 +4044,7 @@ deploymentSpec:
           _parsed_args = vars(_parser.parse_args())
 
           _outputs = hello_world(**_parsed_args)
-        image: python:3.7
+        image: python:3.9
 pipelineInfo:
   name: hello-world
 root:
@@ -4077,7 +4077,7 @@ deploymentSpec:
   executors:
     exec-hello-world:
       container:
-        image: python:3.7
+        image: python:3.9
 pipelineInfo:
   name: pipelines/p1/versions/v1
 root:

backend/src/apiserver/resource/resource_manager_util_test.go

@@ -68,7 +68,7 @@ spec:
       command:
       - python
       - -c
-      image: python:alpine3.6
+      image: python:alpine3.9
       name: ""
       resources: {}
     inputs: {}
@@ -181,7 +181,7 @@ spec:
       command:
       - python
       - -c
-      image: python:alpine3.6
+      image: python:alpine3.9
       name: ""
       resources: {}
     inputs: {}

backend/src/apiserver/server/pipeline_upload_server_test.go

@@ -667,7 +667,7 @@ deploymentSpec:
           _parsed_args = vars(_parser.parse_args())
 
           _outputs = hello_world(**_parsed_args)
-        image: python:3.7
+        image: python:3.9
 pipelineInfo:
   name: hello-world
 root:
@@ -724,7 +724,7 @@ deploymentSpec:
           _parsed_args = vars(_parser.parse_args())
 
           _outputs = hello_world(**_parsed_args)
-        image: python:3.7
+        image: python:3.9
 pipelineInfo:
   name: hello-world
 root:
@@ -765,7 +765,7 @@ deploymentSpec:
   executors:
     exec-hello-world:
       container:
-        image: python:3.7
+        image: python:3.9
 pipelineInfo:
   name: hello-world-
 root:
@@ -790,7 +790,7 @@ deploymentSpec:
   executors:
     exec-hello-world:
       container:
-        image: python:3.7
+        image: python:3.9
 pipelineInfo:
   name: hEllo-world
 root:
@@ -815,7 +815,7 @@ deploymentSpec:
   executors:
     exec-hello-world:
       container:
-        image: python:3.7
+        image: python:3.9
 pipelineInfo:
   name: more than  128 characters more than  128 characters more than  128 characters more than  128 characters more than  128 characters
 root:
@@ -840,7 +840,7 @@ deploymentSpec:
   executors:
     exec-hello-world:
       container:
-        image: python:3.7
+        image: python:3.9
 pipelineInfo:
   name: hello-worl.d
 root:

backend/src/apiserver/server/test/pipeline_with_volume.yaml

@@ -66,7 +66,7 @@ deploymentSpec:
           '
         - "\nimport kfp\nfrom kfp import dsl\nfrom kfp.dsl import *\nfrom typing import\
           \ *\n\ndef comp():\n    pass\n\n"
-        image: python:3.7
+        image: python:3.9
     exec-comp-2:
       container:
         args:
@@ -92,7 +92,7 @@ deploymentSpec:
           '
         - "\nimport kfp\nfrom kfp import dsl\nfrom kfp.dsl import *\nfrom typing import\
           \ *\n\ndef comp():\n    pass\n\n"
-        image: python:3.7
+        image: python:3.9
     exec-comp-3:
       container:
         args:
@@ -118,7 +118,7 @@ deploymentSpec:
           '
         - "\nimport kfp\nfrom kfp import dsl\nfrom kfp.dsl import *\nfrom typing import\
           \ *\n\ndef comp():\n    pass\n\n"
-        image: python:3.7
+        image: python:3.9
     exec-createpvc:
       container:
         image: argostub/createpvc