build: drop Python 3.8 support (#8978)

* draft

* readd typing_extensions

* small fix + release note

* remove ruff target-version

* Update releasenotes/notes/drop-python-3.8-868710963e794c83.yaml

Co-authored-by: David S. Batista <dsbatista@gmail.com>

---------

Co-authored-by: David S. Batista <dsbatista@gmail.com>

haystack/core/component/component.py

@@ -70,7 +70,6 @@ method decorated with `@component.input`. This dataclass contains:
 """
 
 import inspect
-import sys
 from collections.abc import Callable
 from contextlib import contextmanager
 from contextvars import ContextVar
@@ -157,11 +156,7 @@ class Component(Protocol):
     # arguments. Even defining here a method with `**kwargs` doesn't work as the
     # expected signature must be identical.
     # This makes most Language Servers and type checkers happy and shows less errors.
-    # NOTE: This check can be removed when we drop Python 3.8 support.
-    if sys.version_info >= (3, 9):
-        run: Callable[..., Dict[str, Any]]
-    else:
-        run: Callable
+    run: Callable[..., Dict[str, Any]]
 
 
 class ComponentMeta(type):

haystack/core/component/types.py

@@ -3,9 +3,9 @@
 # SPDX-License-Identifier: Apache-2.0
 
 from dataclasses import dataclass, field
-from typing import Any, Iterable, List, Type, TypeVar, get_args
+from typing import Annotated, Any, Iterable, List, Type, TypeVar, get_args
 
-from typing_extensions import Annotated, TypeAlias  # Python 3.8 compatibility
+from typing_extensions import TypeAlias  # Python 3.9 compatibility
 
 HAYSTACK_VARIADIC_ANNOTATION = "__haystack__variadic_t"
 HAYSTACK_GREEDY_VARIADIC_ANNOTATION = "__haystack__greedy_variadic_t"

pyproject.toml

@@ -8,7 +8,7 @@ dynamic = ["version"]
 description = "LLM framework to build customizable, production-ready LLM applications. Connect components (models, vector DBs, file converters) to pipelines or agents that can interact with your data."
 readme = "README.md"
 license = "Apache-2.0"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 authors = [{ name = "deepset.ai", email = "malte.pietsch@deepset.ai" }]
 keywords = [
   "BERT",
@@ -34,7 +34,6 @@ classifiers = [
   "Operating System :: OS Independent",
   "Programming Language :: Python",
   "Programming Language :: Python :: 3",
-  "Programming Language :: Python :: 3.8",
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
@@ -53,7 +52,7 @@ dependencies = [
   "pyyaml",
   "more-itertools",         # TextDocumentSplitter
   "networkx",               # Pipeline graphs
-  "typing_extensions>=4.7", # typing support for Python 3.8
+  "typing_extensions>=4.7", # typing support for Python 3.9
   "requests",
   "numpy",
   "python-dateutil",
@@ -289,7 +288,6 @@ ignore_missing_imports = true
 
 [tool.ruff]
 line-length = 120
-target-version = "py38"
 exclude = [".github", "proposals"]
 
 [tool.ruff.format]

releasenotes/notes/drop-python-3.8-868710963e794c83.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Starting from Haystack 2.11.0 Python 3.8 is no longer supported.
+    Python 3.8 reached its end of life on October 2024.

test/components/converters/test_markdown_to_document.py

@@ -54,8 +54,9 @@ class TestMarkdownToDocument:
 
         converter = MarkdownToDocument()
 
-        with patch("haystack.components.converters.markdown.normalize_metadata") as normalize_metadata, patch(
-            "haystack.components.converters.markdown.MarkdownIt"
+        with (
+            patch("haystack.components.converters.markdown.normalize_metadata") as normalize_metadata,
+            patch("haystack.components.converters.markdown.MarkdownIt"),
         ):
             converter.run(sources=[bytestream, test_files_path / "markdown" / "sample.md"], meta={"language": "it"})
 

test/core/component/test_component.py

@@ -496,8 +496,9 @@ def test_pre_init_hooking_variadic_positional_args():
     assert c.kwarg1 is None
     assert c.kwarg2 == "string"
 
-    with pytest.raises(ComponentError), _hook_component_init(
-        partial(pre_init_hook, expected_params={"args": (1, 2), "kwarg1": None})
+    with (
+        pytest.raises(ComponentError),
+        _hook_component_init(partial(pre_init_hook, expected_params={"args": (1, 2), "kwarg1": None})),
     ):
         _ = MockComponent(1, 2, kwarg1=None)
 

test/tools/test_from_function.py

@@ -2,12 +2,7 @@ import pytest
 
 from haystack.tools.from_function import create_tool_from_function, _remove_title_from_schema, tool
 from haystack.tools.errors import SchemaGenerationError
-from typing import Literal, Optional
-
-try:
-    from typing import Annotated
-except ImportError:
-    from typing_extensions import Annotated
+from typing import Annotated, Literal, Optional
 
 
 def function_with_docstring(city: str) -> str: