BLD: Drop support for Python 3.9 in databento

Author: nmacholl

.github/workflows/release.yml

@@ -13,10 +13,10 @@ jobs:
     if: ${{ github.event.workflow_run.conclusion == 'success' }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-python@v5
         with:
-          python-version: "3.10"
+          python-version: "3.12"
       - uses: snok/install-poetry@v1
         with:
           virtualenvs-create: true
@@ -32,7 +32,7 @@ jobs:
           sed -n '/^## /{n; :a; /^## /q; p; n; ba}' CHANGELOG.md >> NOTES.md
 
       - name: Release
-        uses: softprops/action-gh-release@v1
+        uses: softprops/action-gh-release@v2
         with:
           fail_on_unmatched_files: true
           append_body: true

.github/workflows/test.yml

@@ -10,12 +10,12 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
     name: build - Python ${{ matrix.python-version }} (${{ matrix.os }})
     runs-on: ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}

CHANGELOG.md

@@ -8,6 +8,9 @@
 #### Enhancements
 - Added export of `CBBOMsg` and `BBOMsg` from `databento_dbn` to the root `databento` package
 
+#### Breaking changes
+- Removed support for Python 3.9 due to end of life
+
 ## 0.64.0 - 2025-09-30
 
 #### Enhancements

README.md

@@ -28,9 +28,9 @@ You can find our full client API reference on the [Historical Reference](https:/
 [Examples](https://databento.com/docs/examples?historical=python&live=python) section for various tutorials and code samples.
 
 ## Requirements
-The library is fully compatible with the latest distribution of Anaconda 3.9 and above.
+The library is fully compatible with distributions of Anaconda 2023.x and above.
 The minimum dependencies as found in the `pyproject.toml` are also listed below:
-- python = "^3.9"
+- python = "^3.10"
 - aiohttp = "^3.8.3"
 - databento-dbn = "~0.42.0"
 - numpy = ">=1.23.5"

pyproject.toml

@@ -1,15 +1,11 @@
-[tool.poetry]
+[project]
 name = "databento"
 version = "0.64.0"
 description = "Official Python client library for Databento"
-authors = [
-    "Databento <[email protected]>",
-]
-license = "Apache License 2.0"
-packages = [
-    {include = "databento"},
-    {include = "databento/py.typed"},
-]
+readme = "README.md"
+requires-python = ">=3.10"
+license = "Apache-2.0"
+authors = [{ name = "Databento", email = "[email protected]" }]
 classifiers = [
     "Development Status :: 4 - Beta",
     "Operating System :: OS Independent",
@@ -18,30 +14,34 @@ classifiers = [
     "Topic :: Office/Business :: Financial",
     "Topic :: Office/Business :: Financial :: Investment",
 ]
-readme = "README.md"
-documentation = "https://databento.com/docs"
-homepage = "https://databento.com"
-repository = "https://github.com/databento/databento-python"
+dependencies = [
+    "aiohttp>=3.8.3,<4.0.0; python_version < '3.12'",
+    "aiohttp>=3.9.0,<4.0.0; python_version >= '3.12'",
+    "databento-dbn~=0.42.0",
+    "numpy>=1.23.5; python_version < '3.12'",
+    "numpy>=1.26.0; python_version >= '3.12'",
+    "pandas>=1.5.3",
+    "pip-system-certs>=4.0; platform_system == 'Windows'",
+    "pyarrow>=13.0.0",
+    "requests>=2.27.0",
+    "zstandard>=0.21.0",
+]
 
-[tool.poetry.urls]
+[project.urls]
+Homepage = "https://databento.com"
+Documentation = "https://databento.com/docs"
+Repository = "https://github.com/databento/databento-python"
 "Bug Tracker" = "https://github.com/databento/databento-python/issues"
 
-[tool.poetry.dependencies]
-python = "^3.9"
-aiohttp = [
-    {version = "^3.8.3", python = "<3.12"},
-    {version = "^3.9.0", python = "^3.12"}
-]
-databento-dbn = "~=0.42.0"
-numpy = [
-    {version = ">=1.23.5", python = "<3.12"},
-    {version = ">=1.26.0", python = "^3.12"}
+[tool.poetry]
+requires-poetry = ">=2.0"
+packages = [
+    { include = "databento" },
+    { include = "databento/py.typed" },
 ]
-pandas = ">=1.5.3"
-pip-system-certs = {version=">=4.0", markers="platform_system == 'Windows'"}
-pyarrow = ">=13.0.0"
-requests = ">=2.27.0"
-zstandard = ">=0.21.0"
+
+[tool.poetry.dependencies]
+requires-python = ">=3.10,<3.14"
 
 [tool.poetry.group.dev.dependencies]
 black = "^23.9.1"
@@ -63,7 +63,7 @@ build-backend = "poetry.core.masonry.api"
 line_length = 100
 
 [tool.mypy]
-python_version = 3.9
+python_version = "3.10"
 disallow_untyped_defs = true
 disallow_any_generics = true
 disallow_subclassing_any = true