chore: Drop Python 3.9 support (#322)

Signed-off-by: Sreekanth <prsreekanth920@gmail.com>

Author: BulkBeing

.github/workflows/coverage.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.9"]
+        python-version: ["3.10"]
 
     steps:
     - uses: actions/checkout@v3

.github/workflows/pypi.yaml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ "3.9" ]
+        python-version: [ "3.10" ]
 
     name: Publish to PyPi
     steps:

.github/workflows/run-tests.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
 
     steps:
     - uses: actions/checkout@v3

.pre-commit-config.yaml

@@ -1,11 +1,11 @@
 default_language_version:
-    python: python3.9
+    python: python3.10
 repos:
 - repo: https://github.com/psf/black
   rev: 23.3.0
   hooks:
   -   id: black
-      language_version: python3.9
+      language_version: python3.10
       args: [--config=pyproject.toml, --diff, --color ]
 - repo: https://github.com/charliermarsh/ruff-pre-commit
   rev: 'v0.0.264'

packages/pynumaflow/docs/contributing.md

@@ -6,7 +6,7 @@ Thank you for your interest in contributing to pynumaflow! This guide will help
 
 ### Prerequisites
 
-- Python 3.9 or higher
+- Python 3.10 or higher
 - [Poetry](https://python-poetry.org/) for dependency management
 - Git
 

packages/pynumaflow/examples/sourcetransform/async_event_time_filter/pyproject.toml

@@ -7,7 +7,7 @@ readme = "README.md"
 packages = [{include = "mapt_event_time_filter"}]
 
 [tool.poetry.dependencies]
-python = ">=3.9, <3.12"
+python = ">=3.10, <3.12"
 pynumaflow = { path = "../../../"}
 
 [build-system]

packages/pynumaflow/examples/sourcetransform/event_time_filter/pyproject.toml

@@ -7,7 +7,7 @@ readme = "README.md"
 packages = [{include = "mapt_event_time_filter"}]
 
 [tool.poetry.dependencies]
-python = ">=3.9, <3.12"
+python = ">=3.10, <3.12"
 pynumaflow = { path = "../../../"}
 
 [build-system]

packages/pynumaflow/poetry.lock

@@ -1,5 +1,5 @@
 from dataclasses import dataclass, field
-from typing import Optional
+
 from pynumaflow.proto.common import metadata_pb2
 
 """
@@ -48,7 +48,7 @@ def keys(self, group: str) -> list[str]:
         """
         return list(self._data.get(group, {}).keys())
 
-    def value(self, group: str, key: str) -> Optional[bytes]:
+    def value(self, group: str, key: str) -> bytes | None:
         """
         Returns the value for a given group and key.
         """
@@ -108,7 +108,7 @@ def __len__(self) -> int:
         """
         return len(self._data)
 
-    def value(self, group: str, key: str) -> Optional[bytes]:
+    def value(self, group: str, key: str) -> bytes | None:
         """
         Returns the value for a given group and key.
         If the group or key does not exist, returns None.
@@ -124,7 +124,7 @@ def add_key(self, group: str, key: str, value: bytes):
         """
         self._data.setdefault(group, {})[key] = value
 
-    def remove_key(self, group: str, key: str) -> Optional[bytes]:
+    def remove_key(self, group: str, key: str) -> bytes | None:
         """
         Removes the key and its value for a given group and returns the value.
         If this key is the only key in the group, the group will be removed.
@@ -138,7 +138,7 @@ def remove_key(self, group: str, key: str) -> Optional[bytes]:
             self._data[group] = group_data
         return value
 
-    def remove_group(self, group: str) -> Optional[dict[str, bytes]]:
+    def remove_group(self, group: str) -> dict[str, bytes] | None:
         """
         Removes the group and all its keys and values and returns the data.
         Returns None if the group does not exist.