DEPS: Drop Python 3.9 (pandas-dev#58238)

* DEPS: Drop Python 3.9

* Update GHA files

* remove 3.8 ref in test file

* Move back to 3.9 for pypy

* Bump pyupgrade

* Run pyupgrade

* Remove pandas.compat.compressors

* Fix env file

* Wronge error message

* Ignore pypy

* Test package checks with 3.12

* Modify subprocess test

* revert conda-forge checks

* Remove 3.9 from circleci

* Pyupgrade

* Don't build 39 wheels

Author: mroeschke

.circleci/config.yml

@@ -141,11 +141,9 @@ workflows:
               only: /^v.*/
           matrix:
             parameters:
-              cibw-build: ["cp39-manylinux_aarch64",
-                           "cp310-manylinux_aarch64",
+              cibw-build: ["cp310-manylinux_aarch64",
                            "cp311-manylinux_aarch64",
                            "cp312-manylinux_aarch64",
-                           "cp39-musllinux_aarch64",
                            "cp310-musllinux_aarch64",
                            "cp311-musllinux_aarch64",
                            "cp312-musllinux_aarch64",]

.github/workflows/package-checks.yml

@@ -53,7 +53,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        python-version: ['3.9', '3.10', '3.11']
+        python-version: ['3.10', '3.11']
       fail-fast: false
     name: Test Conda Forge Recipe - Python ${{ matrix.python-version }}
     concurrency:

.github/workflows/unit-tests.yml

@@ -26,7 +26,7 @@ jobs:
     timeout-minutes: 90
     strategy:
       matrix:
-        env_file: [actions-39.yaml, actions-310.yaml, actions-311.yaml, actions-312.yaml]
+        env_file: [actions-310.yaml, actions-311.yaml, actions-312.yaml]
         # Prevent the include jobs from overriding other jobs
         pattern: [""]
         include:
@@ -35,7 +35,7 @@ jobs:
             pattern: "not slow and not network and not single_cpu"
             pytest_target: "pandas/tests/test_downstream.py"
           - name: "Minimum Versions"
-            env_file: actions-39-minimum_versions.yaml
+            env_file: actions-310-minimum_versions.yaml
             pattern: "not slow and not network and not single_cpu"
           - name: "Locale: it_IT"
             env_file: actions-311.yaml
@@ -146,6 +146,8 @@ jobs:
     - name: Build Pandas
       id: build
       uses: ./.github/actions/build_pandas
+      # TODO: Re-enable once Pypy has Pypy 3.10 on conda-forge
+      if: ${{ matrix.name != 'Pypy' }}
       with:
         meson_args: ${{ matrix.meson_args }}
         cflags_adds: ${{ matrix.cflags_adds }}
@@ -170,7 +172,7 @@ jobs:
       matrix:
         # Note: Don't use macOS latest since macos 14 appears to be arm64 only
         os: [macos-13, macos-14, windows-latest]
-        env_file: [actions-39.yaml, actions-310.yaml, actions-311.yaml, actions-312.yaml]
+        env_file: [actions-310.yaml, actions-311.yaml, actions-312.yaml]
       fail-fast: false
     runs-on: ${{ matrix.os }}
     name: ${{ format('{0} {1}', matrix.os, matrix.env_file) }}

.github/workflows/wheels.yml

@@ -99,7 +99,7 @@ jobs:
         - [macos-14, macosx_arm64]
         - [windows-2022, win_amd64]
         # TODO: support PyPy?
-        python: [["cp39", "3.9"], ["cp310", "3.10"], ["cp311", "3.11"], ["cp312", "3.12"]]
+        python: [["cp310", "3.10"], ["cp311", "3.11"], ["cp312", "3.12"]]
     env:
       IS_PUSH: ${{ github.event_name == 'push' && startsWith(github.ref, 'refs/tags/v') }}
       IS_SCHEDULE_DISPATCH: ${{ github.event_name == 'schedule' || github.event_name == 'workflow_dispatch' }}

.pre-commit-config.yaml

@@ -75,7 +75,7 @@ repos:
     rev: v3.15.2
     hooks:
     -   id: pyupgrade
-        args: [--py39-plus]
+        args: [--py310-plus]
 -   repo: https://github.com/pre-commit/pygrep-hooks
     rev: v1.10.0
     hooks:

ci/deps/actions-39-minimum_versions.yaml renamed to ci/deps/actions-310-minimum_versions.yaml

@@ -4,7 +4,7 @@ name: pandas-dev
 channels:
   - conda-forge
 dependencies:
-  - python=3.9
+  - python=3.10
 
   # build dependencies
   - versioneer[toml]

ci/deps/actions-39.yaml

@@ -130,7 +130,7 @@ Consult the docs for setting up pyenv `here <https://github.com/pyenv/pyenv>`__.
    pyenv virtualenv <version> <name-to-give-it>
 
    # For instance:
-   pyenv virtualenv 3.9.10 pandas-dev
+   pyenv virtualenv 3.10 pandas-dev
 
    # Activate the virtualenv
    pyenv activate pandas-dev

doc/source/development/contributing_environment.rst

@@ -161,7 +161,7 @@ Python terminal.
 
     >>> import pandas as pd
     >>> pd.test()
-    running: pytest -m "not slow and not network and not db" /home/user/anaconda3/lib/python3.9/site-packages/pandas
+    running: pytest -m "not slow and not network and not db" /home/user/anaconda3/lib/python3.10/site-packages/pandas
 
     ============================= test session starts ==============================
     platform linux -- Python 3.9.7, pytest-6.2.5, py-1.11.0, pluggy-1.0.0

doc/source/getting_started/install.rst

@@ -190,6 +190,11 @@ In cases with mixed-resolution inputs, the highest resolution is used:
 
 .. _whatsnew_300.api_breaking.deps:
 
+Increased minimum version for Python
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+pandas 3.0.0 supports Python 3.10 and higher.
+
 Increased minimum versions for dependencies
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 Some minimum supported versions of dependencies were updated.