CI: Change development python version to 3.10

.circleci/config.yml

@@ -6,7 +6,7 @@ jobs:
       image: ubuntu-2004:2022.04.1
     resource_class: arm.large
     environment:
-      ENV_FILE: ci/deps/circle-38-arm64.yaml
+      ENV_FILE: ci/deps/circle-39-arm64.yaml
       PYTEST_WORKERS: auto
       PATTERN: "not single_cpu and not slow and not network and not clipboard and not arm_slow and not db"
       PYTEST_TARGET: "pandas"

.github/workflows/code-checks.yml

@@ -179,7 +179,7 @@ jobs:
         id: setup_python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.8'
+          python-version: '3.10'
           cache: 'pip'
           cache-dependency-path: 'requirements-dev.txt'
 

.github/workflows/package-checks.yml

@@ -38,7 +38,7 @@ jobs:
         id: setup_python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.8'
+          python-version: '3.10'
 
       - name: Install required dependencies
         run: |

.github/workflows/sdist.yml

@@ -29,7 +29,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.9", "3.10", "3.11"]
     concurrency:
       # https://github.community/t/concurrecy-not-work-for-push/183068/7
       group: ${{ github.event_name == 'push' && github.run_number || github.ref }}-${{matrix.python-version}}-sdist
@@ -80,8 +80,6 @@ jobs:
     - name: Force oldest supported NumPy
       run: |
         case "${{matrix.python-version}}" in
-        3.8)
-          pip install numpy==1.21.6 ;;
         3.9)
           pip install numpy==1.21.6 ;;
         3.10)

.github/workflows/unit-tests.yml

@@ -26,19 +26,19 @@ jobs:
     timeout-minutes: 180
     strategy:
       matrix:
-        env_file: [actions-38.yaml, actions-39.yaml, actions-310.yaml, actions-311.yaml]
+        env_file: [actions-39.yaml, actions-310.yaml, actions-311.yaml]
         # Prevent the include jobs from overriding other jobs
         pattern: [""]
         include:
           - name: "Downstream Compat"
-            env_file: actions-38-downstream_compat.yaml
+            env_file: actions-39-downstream_compat.yaml
             pattern: "not slow and not network and not single_cpu"
             pytest_target: "pandas/tests/test_downstream.py"
           - name: "Minimum Versions"
-            env_file: actions-38-minimum_versions.yaml
+            env_file: actions-39-minimum_versions.yaml
             pattern: "not slow and not network and not single_cpu"
           - name: "Locale: it_IT"
-            env_file: actions-38.yaml
+            env_file: actions-310.yaml
             pattern: "not slow and not network and not single_cpu"
             extra_apt: "language-pack-it"
             # Use the utf8 version as the default, it has no bad side-effect.
@@ -48,7 +48,7 @@ jobs:
             # It will be temporarily activated during tests with locale.setlocale
             extra_loc: "it_IT"
           - name: "Locale: zh_CN"
-            env_file: actions-38.yaml
+            env_file: actions-310.yaml
             pattern: "not slow and not network and not single_cpu"
             extra_apt: "language-pack-zh-hans"
             # Use the utf8 version as the default, it has no bad side-effect.
@@ -62,7 +62,7 @@ jobs:
             pattern: "not slow and not network and not single_cpu"
             pandas_copy_on_write: "1"
           - name: "Pypy"
-            env_file: actions-pypy-38.yaml
+            env_file: actions-pypy-39.yaml
             pattern: "not slow and not network and not single_cpu"
             test_args: "--max-worker-restart 0"
           - name: "Numpy Dev"
@@ -173,7 +173,7 @@ jobs:
     strategy:
       matrix:
         os: [macos-latest, windows-latest]
-        env_file: [actions-38.yaml, actions-39.yaml, actions-310.yaml, actions-311.yaml]
+        env_file: [actions-39.yaml, actions-310.yaml, actions-311.yaml]
       fail-fast: false
     runs-on: ${{ matrix.os }}
     name: ${{ format('{0} {1}', matrix.os, matrix.env_file) }}
@@ -227,7 +227,7 @@ jobs:
           fi
       - name: Build environment and Run Tests
         run: |
-          /opt/python/cp38-cp38/bin/python -m venv ~/virtualenvs/pandas-dev
+          /opt/python/cp39-cp39/bin/python -m venv ~/virtualenvs/pandas-dev
           . ~/virtualenvs/pandas-dev/bin/activate
           python -m pip install --no-cache-dir --no-deps -U pip wheel setuptools
           python -m pip install --no-cache-dir versioneer[toml] cython numpy python-dateutil pytz pytest>=7.0.0 pytest-xdist>=2.2.0 pytest-asyncio>=0.17 hypothesis>=6.46.1

.github/workflows/wheels.yml

@@ -55,7 +55,7 @@ jobs:
         - [windows-2019, win_amd64]
         - [windows-2019, win32]
         # TODO: support PyPy?
-        python: [["cp38", "3.8"], ["cp39", "3.9"], ["cp310", "3.10"],  ["cp311", "3.11"]]# "pp38", "pp39"]
+        python: [["cp39", "3.9"], ["cp310", "3.10"],  ["cp311", "3.11"]]# "pp38", "pp39"]
     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' }}
@@ -152,7 +152,7 @@ jobs:
           auto-update-conda: true
           # Really doesn't matter what version we upload with
           # just the version we test with
-          python-version: '3.8'
+          python-version: '3.10'
           channels: conda-forge
           channel-priority: true
           # mamba fails to solve, also we really don't need this since we're just installing python

ci/deps/actions-38-downstream_compat.yaml → ci/deps/actions-39-downstream_compat.yaml

@@ -3,7 +3,7 @@ name: pandas-dev
 channels:
   - conda-forge
 dependencies:
-  - python=3.8
+  - python=3.9
 
   # build dependencies
   - versioneer[toml]

ci/deps/actions-38-minimum_versions.yaml → ci/deps/actions-39-minimum_versions.yaml

@@ -4,7 +4,7 @@ name: pandas-dev
 channels:
   - conda-forge
 dependencies:
-  - python=3.8.0
+  - python=3.9
 
   # build dependencies
   - versioneer[toml]

ci/deps/actions-pypy-38.yaml → ci/deps/actions-pypy-39.yaml

@@ -5,7 +5,7 @@ dependencies:
   # TODO: Add the rest of the dependencies in here
   # once the other plentiful failures/segfaults
   # with base pandas has been dealt with
-  - python=3.8[build=*_pypy] # TODO: use this once pypy3.8 is available
+  - python=3.9[build=*_pypy]
 
   # build dependencies
   - versioneer[toml]

ci/deps/circle-38-arm64.yaml → ci/deps/circle-39-arm64.yaml

@@ -2,7 +2,7 @@ name: pandas-dev
 channels:
   - conda-forge
 dependencies:
-  - python=3.8
+  - python=3.9
 
   # build dependencies
   - versioneer[toml]

doc/source/conf.py

@@ -76,6 +76,7 @@
     # to ensure that include files (partial pages) aren't built, exclude them
     # https://github.com/sphinx-doc/sphinx/issues/1965#issuecomment-124732907
     "**/includes/**",
+    "**/api/pandas.Series.dt.rst",
 ]
 try:
     import nbconvert

environment.yml

@@ -3,7 +3,7 @@ name: pandas-dev
 channels:
   - conda-forge
 dependencies:
-  - python=3.8
+  - python=3.10
   - pip
 
   # build dependencies
@@ -38,7 +38,7 @@ dependencies:
   - matplotlib>=3.6.1
   - numba>=0.55.2
   - numexpr>=2.8.0  # pin for "Run checks on imported code" job
-  - openpyxl<3.1.1, >=3.0.7
+  - openpyxl>=3.0.10
   - odfpy>=1.4.1
   - py
   - psycopg2>=2.9.3

pandas/_libs/tslibs/timestamps.pyi

@@ -158,7 +158,9 @@ class Timestamp(datetime):
     def __hash__(self) -> int: ...
     def weekday(self) -> int: ...
     def isoweekday(self) -> int: ...
-    def isocalendar(self) -> tuple[int, int, int]: ...
+    # Return type "Tuple[int, int, int]" of "isocalendar" incompatible with return
+    # type "_IsoCalendarDate" in supertype "date"
+    def isocalendar(self) -> tuple[int, int, int]: ...  # type: ignore[override]
     @property
     def is_leap_year(self) -> bool: ...
     @property

pandas/conftest.py

@@ -84,7 +84,7 @@
 zoneinfo = None
 if compat.PY39:
     # Import "zoneinfo" could not be resolved (reportMissingImports)
-    import zoneinfo  # type: ignore[no-redef]
+    import zoneinfo  # type: ignore[assignment]
 
     # Although zoneinfo can be imported in Py39, it is effectively
     # "not available" without tzdata/IANA tz data.
@@ -1964,7 +1964,9 @@ def using_copy_on_write() -> bool:
 
 warsaws = ["Europe/Warsaw", "dateutil/Europe/Warsaw"]
 if zoneinfo is not None:
-    warsaws.append(zoneinfo.ZoneInfo("Europe/Warsaw"))
+    warsaws.append(
+        zoneinfo.ZoneInfo("Europe/Warsaw")  # pyright: ignore[reportGeneralTypeIssues]
+    )
 
 
 @pytest.fixture(params=warsaws)

pandas/core/generic.py

@@ -11755,8 +11755,7 @@ def __iand__(self, other) -> Self:
 
     @final
     def __ior__(self, other) -> Self:
-        # error: Unsupported left operand type for | ("Type[NDFrame]")
-        return self._inplace_method(other, type(self).__or__)  # type: ignore[operator]
+        return self._inplace_method(other, type(self).__or__)
 
     @final
     def __ixor__(self, other) -> Self:

pandas/plotting/_core.py

@@ -1831,7 +1831,9 @@ def _load_backend(backend: str) -> types.ModuleType:
     if hasattr(eps, "select"):
         entry = eps.select(group=key)  # pyright: ignore[reportGeneralTypeIssues]
     else:
-        entry = eps.get(key, ())
+        # Argument 2 to "get" of "dict" has incompatible type "Tuple[]";
+        # expected "EntryPoints"  [arg-type]
+        entry = eps.get(key, ())  # type: ignore[arg-type]
     for entry_point in entry:
         found_backend = entry_point.name == backend
         if found_backend:

pandas/tests/arrays/test_datetimes.py

@@ -1,13 +1,16 @@
 """
 Tests for DatetimeArray
 """
+from __future__ import annotations
+
 from datetime import timedelta
 import operator
 
 try:
     from zoneinfo import ZoneInfo
 except ImportError:
-    ZoneInfo = None
+    # Cannot assign to a type
+    ZoneInfo = None  # type: ignore[misc, assignment]
 
 import numpy as np
 import pytest
@@ -712,7 +715,9 @@ def test_tz_localize_t2d(self):
             # no tzdata
             pass
         else:
-            easts.append(tz)
+            # Argument 1 to "append" of "list" has incompatible type "ZoneInfo";
+            # expected "str"
+            easts.append(tz)  # type: ignore[arg-type]
 
     @pytest.mark.parametrize("tz", easts)
     def test_iter_zoneinfo_fold(self, tz):

pandas/tests/indexes/datetimes/test_constructors.py

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from datetime import (
     datetime,
     timedelta,

pandas/tests/indexes/datetimes/test_timezones.py

@@ -22,7 +22,8 @@
 try:
     from zoneinfo import ZoneInfo
 except ImportError:
-    ZoneInfo = None
+    # Cannot assign to a type  [misc]
+    ZoneInfo = None  # type: ignore[misc, assignment]
 
 from pandas._libs.tslibs import (
     conversion,

pandas/tests/scalar/timestamp/test_constructors.py

@@ -848,7 +848,10 @@ def test_timestamp_constructor_retain_fold(tz, fold):
 _tzs = ["dateutil/Europe/London"]
 if PY39:
     try:
-        _tzs = ["dateutil/Europe/London", zoneinfo.ZoneInfo("Europe/London")]
+        _tzs = [
+            "dateutil/Europe/London",
+            zoneinfo.ZoneInfo("Europe/London"),  # type: ignore[list-item]
+        ]
     except zoneinfo.ZoneInfoNotFoundError:
         pass
 

pandas/tests/scalar/timestamp/test_timezones.py

@@ -34,7 +34,8 @@
 try:
     from zoneinfo import ZoneInfo
 except ImportError:
-    ZoneInfo = None
+    # Cannot assign to a type
+    ZoneInfo = None  # type: ignore[misc, assignment]
 
 
 class TestTimestampTZOperations: