chore: dropped python 3.9 support, added python 3.14 and 3.14t support

CHANGELOG.rst

@@ -135,6 +135,13 @@ Bug fixes
   behavior, where ``None`` values have always been supported to represent NULL
   values.
 
+Python Version Support
+~~~~~~~~~~~~~~~~~~~~~~
+
+* Added support for Python 3.14 on all platforms and 3.14t (free threaded) on
+  all platforms except Windows.
+* Dropped support for Python 3.9 (end of life).
+
 4.0.0 (2025-10-17)
 ------------------
 

ci/pip_install_deps.py

@@ -88,12 +88,17 @@ def main(args):
     is_64bits = sys.maxsize > 2 ** 32
     is_cpython = platform.python_implementation() == 'CPython'
     is_final = sys.version_info.releaselevel == 'final'
+    py_version = (sys.version_info.major, sys.version_info.minor)
     if on_linux_is_glibc and is_64bits and is_cpython and is_final:
         # Ensure that we've managed to install the expected dependencies.
         import pandas
         import numpy
         import pyarrow
-        import fastparquet
+
+        # Temporarily don't require fastparquet on 3.14
+        # Compat will still be tested on older releases.
+        if py_version < (3, 14):
+            import fastparquet
 
 
 if __name__ == "__main__":

ci/run_tests_pipeline.yaml

@@ -82,17 +82,17 @@ stages:
             submodules: true
           - task: UsePythonVersion@0
             inputs:
-              versionSpec: "3.9"
+              versionSpec: "3.10"
           - script: |
               python3 --version
               python3 -m pip install uv
               sudo apt-get install -y libopenblas-dev pkg-config
             displayName: "Install uv"
-          - script: uv run --with 'numpy==1.21.0' test/test.py -v TestBufferProtocolVersionV2
+          - script: uv run --python python --with 'numpy==1.21.0' test/test.py -v TestBufferProtocolVersionV2
             displayName: "Test vs numpy 1.21"
-          - script: uv run --with 'numpy==1.24.0' test/test.py -v TestBufferProtocolVersionV2
+          - script: uv run --python python --with 'numpy==1.24.0' test/test.py -v TestBufferProtocolVersionV2
             displayName: "Test vs numpy 1.24"
-          - script: uv run --with 'numpy==1.26.0' test/test.py -v TestBufferProtocolVersionV2
+          - script: uv run --python python --with 'numpy==1.26.0' test/test.py -v TestBufferProtocolVersionV2
             displayName: "Test vs numpy 1.26"
       - job: TestsAgainstVariousNumpyVersion2x
         pool:
@@ -112,9 +112,9 @@ stages:
               python3 -m pip install uv
               sudo apt-get install -y libopenblas-dev pkg-config
             displayName: "Install uv"
-          - script: uv run --with 'numpy==2.0.0' test/test.py -v TestBufferProtocolVersionV2
+          - script: uv run --python python --with 'numpy==2.0.0' test/test.py -v TestBufferProtocolVersionV2
             displayName: "Test vs numpy 2.0"
-          - script: uv run --with 'numpy==2.2.0' test/test.py -v TestBufferProtocolVersionV2
+          - script: uv run --python python --with 'numpy==2.2.0' test/test.py -v TestBufferProtocolVersionV2
             displayName: "Test vs numpy 2.2"
-          - script: uv run --with 'numpy==2.3.0' test/test.py -v TestBufferProtocolVersionV2
+          - script: uv run --python python --with 'numpy==2.3.0' test/test.py -v TestBufferProtocolVersionV2
             displayName: "Test vs numpy 2.3"

pyproject.toml

@@ -1,7 +1,7 @@
 [project]
 # See: https://packaging.python.org/en/latest/specifications/declaring-project-metadata/
 name = "questdb"
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 version = "4.1.0"
 description = "QuestDB client library for Python"
 readme = "README.rst"
@@ -66,9 +66,9 @@ skip = [
     # Those builds are named `*win32*` in cibuildwheel.
     "*i686*",
 
-    # Skip Python 3.14 builds until the dependencies catch up
-    "cp314-*",
-    "cp314t-*"
+    # Temporarily skip the 3.14 free-threaded built on Windows.
+    # Pandas dependencies missing.
+    "*314t-win*"
 ]
 
 # [tool.cibuildwheel.windows]

test/test.py

@@ -1478,6 +1478,11 @@ class TestBufferProtocolVersionV2(TestBases.TestBuffer):
     version = 2
 
 
+class TestBufferProtocolVersionV3(TestBases.TestBuffer):
+    name = 'protocol version 3'
+    version = 3
+
+
 if __name__ == '__main__':
     if os.environ.get('TEST_QUESTDB_PROFILE') == '1':
         import cProfile