Update python version to 3.10

.github/workflows/deploy_pkg.yml

@@ -19,7 +19,7 @@ jobs:
     - name: Install python
       uses: actions/setup-python@v5
       with:
-        python-version: '3.9'
+        python-version: '3.12'
 
     - name: Install dependencies
       run: |

.github/workflows/pytest.yml

@@ -22,9 +22,8 @@ jobs:
     strategy:
       matrix:
         config:
-          - {os: 'ubuntu-latest', python-version: '3.9'}
-          - {os: 'windows-latest', python-version: '3.9'}
-          - {os: 'macOS-latest', python-version: '3.9'}
+          - {os: 'windows-latest', python-version: '3.10'}
+          - {os: 'macOS-latest', python-version: '3.10'}
           - {os: 'ubuntu-latest', python-version: '3.10'}
           - {os: 'ubuntu-latest', python-version: '3.11'}
           - {os: 'ubuntu-latest', python-version: '3.12'}
@@ -57,23 +56,23 @@ jobs:
     - name: Test with pytest
       if: |
         matrix.config.os != 'ubuntu-latest' ||
-        matrix.config.python-version != '3.9'
+        matrix.config.python-version != '3.12'
       run: |
         pytest -m ci
         pytest -m ci_rdd
 
     - name: Test with pytest and coverage
       if: |
         matrix.config.os == 'ubuntu-latest' &&
-        matrix.config.python-version == '3.9'
+        matrix.config.python-version == '3.12'
       run: |
         pip install pytest-cov
         pytest --cov=./ --cov-report=xml --cov-report=html
 
     - name: Archive code coverage results
       if: |
         matrix.config.os == 'ubuntu-latest' &&
-        matrix.config.python-version == '3.9'
+        matrix.config.python-version == '3.12'
       uses: actions/upload-artifact@v4
       with:
         name: code-coverage-report
@@ -85,7 +84,7 @@ jobs:
     - name: Upload coverage to Codecov
       if: |
         matrix.config.os == 'ubuntu-latest' &&
-        matrix.config.python-version == '3.9'
+        matrix.config.python-version == '3.12'
       uses: codecov/codecov-action@v5
       with:
         fail_ci_if_error: false
@@ -96,7 +95,7 @@ jobs:
     - name: Upload coverage to codacy
       if: |
         matrix.config.os == 'ubuntu-latest' &&
-        matrix.config.python-version == '3.9'
+        matrix.config.python-version == '3.12'
       continue-on-error: true
       uses: codacy/codacy-coverage-reporter-action@v1
       with:

README.md

@@ -5,7 +5,7 @@
 [![Conda Version](https://img.shields.io/conda/vn/conda-forge/doubleml.svg)](https://anaconda.org/conda-forge/doubleml)
 [![codecov](https://codecov.io/gh/DoubleML/doubleml-for-py/branch/main/graph/badge.svg?token=0BjlFPgdGk)](https://codecov.io/gh/DoubleML/doubleml-for-py)
 [![Codacy Badge](https://app.codacy.com/project/badge/Grade/1c08ec7d782c451784293c996537de14)](https://www.codacy.com/gh/DoubleML/doubleml-for-py/dashboard?utm_source=github.com&utm_medium=referral&utm_content=DoubleML/doubleml-for-py&utm_campaign=Badge_Grade)
-[![Python version](https://img.shields.io/badge/python-3.9%20%7C%203.10%20%7C%203.11%20%7C%203.12%20%7C%203.13-blue)](https://www.python.org/)
+[![Python version](https://img.shields.io/badge/python-3.10%20%7C%203.11%20%7C%203.12%20%7C%203.13-blue)](https://www.python.org/)
 
 The Python package **DoubleML** provides an implementation of the double / debiased machine learning framework of
 [Chernozhukov et al. (2018)](https://doi.org/10.1111/ectj.12097).

pyproject.toml

@@ -13,7 +13,7 @@ authors = [
 maintainers = [
     {name = "Sven Klaassen", email = "sven.klaassen@uni-hamburg.de"}
 ]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 dependencies = [
     "joblib>=1.2.0",
     "numpy>=2.0.0",
@@ -27,7 +27,6 @@ dependencies = [
 ]
 classifiers = [
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
@@ -85,7 +84,7 @@ doctest_optionflags = [
 
 [tool.black]
 line-length = 127
-target-version = ['py39', 'py310', 'py311', 'py312', 'py313']
+target-version = ['py310', 'py311', 'py312', 'py313']
 preview = true
 exclude = '''
 /(
@@ -102,7 +101,7 @@ exclude = '''
 [tool.ruff]
 # max line length for black
 line-length = 127
-target-version = "py39"
+target-version = "py312"
 
 
 [tool.ruff.lint]