DEPS: Drop Python 3.9

.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 → 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]

doc/source/development/contributing_environment.rst

@@ -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/getting_started/install.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/whatsnew/v3.0.0.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.

pandas/_config/config.py

@@ -55,7 +55,6 @@
 from typing import (
     TYPE_CHECKING,
     Any,
-    Callable,
     NamedTuple,
     cast,
 )
@@ -66,6 +65,7 @@
 
 if TYPE_CHECKING:
     from collections.abc import (
+        Callable,
         Generator,
         Sequence,
     )

pandas/_testing/__init__.py

@@ -6,7 +6,6 @@
 from sys import byteorder
 from typing import (
     TYPE_CHECKING,
-    Callable,
     ContextManager,
     cast,
 )
@@ -85,6 +84,8 @@
 from pandas.core.construction import extract_array
 
 if TYPE_CHECKING:
+    from collections.abc import Callable
+
     from pandas._typing import (
         Dtype,
         NpDtype,

pandas/_testing/_io.py

@@ -7,21 +7,18 @@
 from typing import (
     TYPE_CHECKING,
     Any,
-    Callable,
 )
 import uuid
 import zipfile
 
-from pandas.compat import (
-    get_bz2_file,
-    get_lzma_file,
-)
 from pandas.compat._optional import import_optional_dependency
 
 import pandas as pd
 from pandas._testing.contexts import ensure_clean
 
 if TYPE_CHECKING:
+    from collections.abc import Callable
+
     from pandas._typing import (
         FilePath,
         ReadPickleBuffer,
@@ -129,11 +126,15 @@ def write_to_compressed(compression, path, data, dest: str = "test") -> None:
     elif compression == "gzip":
         compress_method = gzip.GzipFile
     elif compression == "bz2":
-        compress_method = get_bz2_file()
+        import bz2
+
+        compress_method = bz2.BZ2File
     elif compression == "zstd":
         compress_method = import_optional_dependency("zstandard").open
     elif compression == "xz":
-        compress_method = get_lzma_file()
+        import lzma
+
+        compress_method = lzma.LZMAFile
     else:
         raise ValueError(f"Unrecognized compression type: {compression}")
 

pandas/_typing.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 from collections.abc import (
+    Callable,
     Hashable,
     Iterator,
     Mapping,
@@ -18,7 +19,6 @@
 from typing import (
     TYPE_CHECKING,
     Any,
-    Callable,
     Literal,
     Optional,
     Protocol,
@@ -90,18 +90,12 @@
     # Name "npt._ArrayLikeInt_co" is not defined  [name-defined]
     NumpySorter = Optional[npt._ArrayLikeInt_co]  # type: ignore[name-defined]
 
-    from typing import SupportsIndex
-
-    if sys.version_info >= (3, 10):
-        from typing import Concatenate  # pyright: ignore[reportUnusedImport]
-        from typing import ParamSpec
-        from typing import TypeGuard  # pyright: ignore[reportUnusedImport]
-    else:
-        from typing_extensions import (  # pyright: ignore[reportUnusedImport]
-            Concatenate,
-            ParamSpec,
-            TypeGuard,
-        )
+    from typing import (
+        ParamSpec,
+        SupportsIndex,
+    )
+    from typing import Concatenate  # pyright: ignore[reportUnusedImport]
+    from typing import TypeGuard  # pyright: ignore[reportUnusedImport]
 
     P = ParamSpec("P")
 

pandas/_version.py

@@ -10,13 +10,13 @@
 
 """Git implementation of _version.py."""
 
+from collections.abc import Callable
 import errno
 import functools
 import os
 import re
 import subprocess
 import sys
-from typing import Callable
 
 
 def get_keywords():

pandas/compat/__init__.py

@@ -18,13 +18,11 @@
 from pandas.compat._constants import (
     IS64,
     ISMUSL,
-    PY310,
     PY311,
     PY312,
     PYPY,
     WASM,
 )
-import pandas.compat.compressors
 from pandas.compat.numpy import is_numpy_dev
 from pandas.compat.pyarrow import (
     pa_version_under10p1,
@@ -148,52 +146,6 @@ def is_ci_environment() -> bool:
     return os.environ.get("PANDAS_CI", "0") == "1"
 
 
-def get_lzma_file() -> type[pandas.compat.compressors.LZMAFile]:
-    """
-    Importing the `LZMAFile` class from the `lzma` module.
-
-    Returns
-    -------
-    class
-        The `LZMAFile` class from the `lzma` module.
-
-    Raises
-    ------
-    RuntimeError
-        If the `lzma` module was not imported correctly, or didn't exist.
-    """
-    if not pandas.compat.compressors.has_lzma:
-        raise RuntimeError(
-            "lzma module not available. "
-            "A Python re-install with the proper dependencies, "
-            "might be required to solve this issue."
-        )
-    return pandas.compat.compressors.LZMAFile
-
-
-def get_bz2_file() -> type[pandas.compat.compressors.BZ2File]:
-    """
-    Importing the `BZ2File` class from the `bz2` module.
-
-    Returns
-    -------
-    class
-        The `BZ2File` class from the `bz2` module.
-
-    Raises
-    ------
-    RuntimeError
-        If the `bz2` module was not imported correctly, or didn't exist.
-    """
-    if not pandas.compat.compressors.has_bz2:
-        raise RuntimeError(
-            "bz2 module not available. "
-            "A Python re-install with the proper dependencies, "
-            "might be required to solve this issue."
-        )
-    return pandas.compat.compressors.BZ2File
-
-
 __all__ = [
     "is_numpy_dev",
     "pa_version_under10p1",
@@ -204,7 +156,6 @@ def get_bz2_file() -> type[pandas.compat.compressors.BZ2File]:
     "pa_version_under16p0",
     "IS64",
     "ISMUSL",
-    "PY310",
     "PY311",
     "PY312",
     "PYPY",