chore(package): drop Python 3.8 support

stainless-app[bot] · stainless-app[bot] · commit e9af5d3676a0 · 2025-11-10T11:34:38.000Z
diff --git a/README.md b/README.md
@@ -3,7 +3,7 @@
 <!-- prettier-ignore -->
 [![PyPI version](https://img.shields.io/pypi/v/anthropic.svg?label=pypi%20(stable))](https://pypi.org/project/anthropic/)
 
-The Anthropic Python library provides convenient access to the Anthropic REST API from any Python 3.8+
+The Anthropic Python library provides convenient access to the Anthropic REST API from any Python 3.9+
 application. It includes type definitions for all request params and response fields,
 and offers both synchronous and asynchronous clients powered by [httpx](https://github.com/encode/httpx).
 
@@ -867,7 +867,7 @@ print(anthropic.__version__)
 
 ## Requirements
 
-Python 3.8 or higher.
+Python 3.9 or higher.
 
 ## Contributing
 
diff --git a/pyproject.toml b/pyproject.toml
@@ -17,11 +17,10 @@ dependencies = [
     "jiter>=0.4.0, <1",
     "docstring-parser>=0.15,<1",
 ]
-requires-python = ">= 3.8"
+requires-python = ">= 3.9"
 classifiers = [
   "Typing :: Typed",
   "Intended Audience :: Developers",
-  "Programming Language :: Python :: 3.8",
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
@@ -136,7 +135,7 @@ format-command="ruff format --stdin-filename {filename}"
 # there are a couple of flags that are still disabled by
 # default in strict mode as they are experimental and niche.
 typeCheckingMode = "strict"
-pythonVersion = "3.8"
+pythonVersion = "3.9"
 
 exclude = [
     ".git",
diff --git a/requirements-dev.lock b/requirements-dev.lock
@@ -3,22 +3,14 @@
 -e .
 annotated-types==0.7.0
     # via pydantic
-anyio==4.5.2 ; python_full_version < '3.9'
-    # via
-    #   anthropic
-    #   httpx
-anyio==4.8.0 ; python_full_version >= '3.9'
+anyio==4.8.0
     # via
     #   anthropic
     #   httpx
 asttokens==3.0.0
     # via inline-snapshot
-astunparse==1.6.3 ; python_full_version < '3.9'
-    # via griffe
-boto3-stubs==1.40.54
-botocore-stubs==1.38.30 ; python_full_version < '3.9'
-    # via boto3-stubs
-botocore-stubs==1.40.54 ; python_full_version >= '3.9'
+boto3-stubs==1.40.69
+botocore-stubs==1.40.69
     # via boto3-stubs
 certifi==2024.12.14
     # via
@@ -41,8 +33,7 @@ execnet==2.1.1
     # via pytest-xdist
 executing==2.2.1
     # via inline-snapshot
-griffe==1.4.0 ; python_full_version < '3.9'
-griffe==1.13.0 ; python_full_version >= '3.9'
+griffe==1.13.0
 h11==0.16.0
     # via httpcore
 httpcore==1.0.9
@@ -55,14 +46,11 @@ idna==3.10
     # via
     #   anyio
     #   httpx
-importlib-metadata==8.5.0 ; python_full_version < '3.9'
-importlib-metadata==8.6.1 ; python_full_version >= '3.9'
+importlib-metadata==8.6.1
 iniconfig==2.0.0
     # via pytest
-inline-snapshot==0.30.0
-jiter==0.9.1 ; python_full_version < '3.9'
-    # via anthropic
-jiter==0.11.0 ; python_full_version >= '3.9'
+inline-snapshot==0.31.1
+jiter==0.12.0
     # via anthropic
 markdown-it-py==3.0.0
     # via rich
@@ -77,62 +65,46 @@ packaging==24.2
     # via pytest
 pluggy==1.5.0
     # via pytest
-pydantic==2.10.6 ; python_full_version < '3.9'
-    # via anthropic
-pydantic==2.11.9 ; python_full_version >= '3.9'
+pydantic==2.10.3
     # via anthropic
-pydantic-core==2.27.2 ; python_full_version < '3.9'
-    # via pydantic
-pydantic-core==2.33.2 ; python_full_version >= '3.9'
+pydantic-core==2.27.1
     # via pydantic
 pygments==2.19.1
     # via
     #   pytest
     #   rich
 pyright==1.1.399
-pytest==8.3.5 ; python_full_version < '3.9'
-    # via
-    #   inline-snapshot
-    #   pytest-asyncio
-    #   pytest-xdist
-pytest==8.4.1 ; python_full_version >= '3.9'
+pytest==8.4.1
     # via
     #   inline-snapshot
     #   pytest-asyncio
     #   pytest-xdist
 pytest-asyncio==0.24.0
-pytest-xdist==3.6.1 ; python_full_version < '3.9'
-pytest-xdist==3.7.0 ; python_full_version >= '3.9'
+pytest-xdist==3.7.0
 python-dateutil==2.9.0.post0
     # via time-machine
-pytz==2024.2 ; python_full_version < '3.9'
-    # via dirty-equals
 respx==0.22.0
 rich==13.9.4
     # via inline-snapshot
 ruff==0.9.4
 six==1.17.0
-    # via
-    #   astunparse
-    #   python-dateutil
+    # via python-dateutil
 sniffio==1.3.1
     # via
     #   anthropic
     #   anyio
-time-machine==2.15.0 ; python_full_version < '3.9'
-time-machine==2.16.0 ; python_full_version >= '3.9'
+time-machine==2.16.0
 tomli==2.2.1 ; python_full_version < '3.11'
     # via
     #   inline-snapshot
     #   mypy
     #   pytest
-types-awscrt==0.28.1
+types-awscrt==0.28.2
     # via botocore-stubs
 types-s3transfer==0.14.0
     # via boto3-stubs
 typing-extensions==4.12.2
     # via
-    #   annotated-types
     #   anthropic
     #   anyio
     #   boto3-stubs
@@ -141,12 +113,5 @@ typing-extensions==4.12.2
     #   pydantic-core
     #   pyright
     #   rich
-    #   typing-inspection
-typing-inspection==0.4.1 ; python_full_version >= '3.9'
-    # via pydantic
-wheel==0.45.1 ; python_full_version < '3.9'
-    # via astunparse
-zipp==3.20.2 ; python_full_version < '3.9'
-    # via importlib-metadata
-zipp==3.21.0 ; python_full_version >= '3.9'
+zipp==3.21.0
     # via importlib-metadata
diff --git a/scripts/test b/scripts/test
@@ -68,8 +68,8 @@ if [[ -n "$UV_PYTHON" ]]; then
 else
   # If UV_PYTHON is not set, run the command for min and max versions
 
-  echo "==> Running tests for Python 3.8"
-  UV_PYTHON=3.8 run_tests "$@"
+  echo "==> Running tests for Python 3.9"
+  UV_PYTHON=3.9 run_tests "$@"
 
   echo "==> Running tests for Python 3.13"
   UV_PYTHON=3.13 run_tests "$@"
diff --git a/src/anthropic/_utils/_sync.py b/src/anthropic/_utils/_sync.py
@@ -1,10 +1,8 @@
 from __future__ import annotations
 
-import sys
 import asyncio
 import functools
-import contextvars
-from typing import Any, TypeVar, Callable, Awaitable
+from typing import TypeVar, Callable, Awaitable
 from typing_extensions import ParamSpec
 
 import anyio
@@ -15,34 +13,11 @@
 T_ParamSpec = ParamSpec("T_ParamSpec")
 
 
-if sys.version_info >= (3, 9):
-    _asyncio_to_thread = asyncio.to_thread
-else:
-    # backport of https://docs.python.org/3/library/asyncio-task.html#asyncio.to_thread
-    # for Python 3.8 support
-    async def _asyncio_to_thread(
-        func: Callable[T_ParamSpec, T_Retval], /, *args: T_ParamSpec.args, **kwargs: T_ParamSpec.kwargs
-    ) -> Any:
-        """Asynchronously run function *func* in a separate thread.
-
-        Any *args and **kwargs supplied for this function are directly passed
-        to *func*. Also, the current :class:`contextvars.Context` is propagated,
-        allowing context variables from the main thread to be accessed in the
-        separate thread.
-
-        Returns a coroutine that can be awaited to get the eventual result of *func*.
-        """
-        loop = asyncio.events.get_running_loop()
-        ctx = contextvars.copy_context()
-        func_call = functools.partial(ctx.run, func, *args, **kwargs)
-        return await loop.run_in_executor(None, func_call)
-
-
 async def to_thread(
     func: Callable[T_ParamSpec, T_Retval], /, *args: T_ParamSpec.args, **kwargs: T_ParamSpec.kwargs
 ) -> T_Retval:
     if sniffio.current_async_library() == "asyncio":
-        return await _asyncio_to_thread(func, *args, **kwargs)
+        return await asyncio.to_thread(func, *args, **kwargs)
 
     return await anyio.to_thread.run_sync(
         functools.partial(func, *args, **kwargs),
@@ -53,10 +28,7 @@ async def to_thread(
 def asyncify(function: Callable[T_ParamSpec, T_Retval]) -> Callable[T_ParamSpec, Awaitable[T_Retval]]:
     """
     Take a blocking function and create an async one that receives the same
-    positional and keyword arguments. For python version 3.9 and above, it uses
-    asyncio.to_thread to run the function in a separate thread. For python version
-    3.8, it uses locally defined copy of the asyncio.to_thread function which was
-    introduced in python 3.9.
+    positional and keyword arguments.
 
     Usage:
 
diff --git a/uv.lock b/uv.lock
