Drop python 3.8. Add python 3.13

Author: schloerke

.github/py-shiny/setup/action.yaml

@@ -39,12 +39,6 @@ runs:
         run: |
           make ci-install-wheel
 
-      - name: Install backports.tarfile
-        if: ${{ startsWith(inputs.python-version, '3.8') }}
-        shell: bash
-        run: |
-          uv pip install backports.tarfile
-
       - name: Pip list
         shell: bash
         run: |

.github/workflows/pytest.yaml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       matrix:
         # "3.10" must be a string; otherwise it is interpreted as 3.1.
-        python-version: ["3.12", "3.11", "3.10", "3.9", "3.8"]
+        python-version: ["3.13", "3.12", "3.11", "3.10", "3.9"]
         os: [ubuntu-latest, windows-latest, macOS-latest]
         exclude:
           - python-version: ${{ github.event.pull_request.draft && '3.11' }}
@@ -108,7 +108,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.12", "3.11", "3.10", "3.9", "3.8"]
+        python-version: ["3.13", "3.12", "3.11", "3.10", "3.9"]
         browser: ["chromium", "firefox", "webkit"]
         exclude:
           - python-version: ${{ github.event.pull_request.draft && '3.11' }}
@@ -118,8 +118,6 @@ jobs:
           - browser: ${{ github.event.pull_request.draft && 'webkit' }}
           # There are many unexplained tests that fail on webkit w/ python 3.8, 3.9
           # Given the more recent versions of python work, we will exclude this combination
-          - browser: "webkit"
-            python-version: "3.8"
           - browser: "webkit"
             python-version: "3.9"
       fail-fast: false
@@ -158,7 +156,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        python-version: ["3.12", "3.11", "3.10", "3.9", "3.8"]
+        python-version: ["3.13", "3.12", "3.11", "3.10", "3.9"]
         browser: ["chromium", "firefox", "webkit"]
         exclude:
           - python-version: ${{ github.event.pull_request.draft && '3.11' }}

pyproject.toml

@@ -15,18 +15,18 @@ dynamic = ["version"]
 authors = [{ name = "Winston Chang", email = "[email protected]" }]
 description = "A web development framework for Python."
 readme = "README.md"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 license = { text = "MIT" }
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Intended Audience :: Developers",
     "License :: OSI Approved :: MIT License",
     "Natural Language :: English",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
 ]
 dependencies = [
     "typing-extensions>=4.10.0",

shiny/_datastructures.py

@@ -15,8 +15,6 @@ class PriorityQueueFIFO(Generic[T]):
     """
 
     def __init__(self) -> None:
-        # Using Tuple instead of tuple because in Python 3.8 and earlier, tuple isn't
-        # generic
         self._pq: PriorityQueue[tuple[int, int, T]] = PriorityQueue()
         self._counter: int = 0
 

shiny/_utils.py

@@ -72,16 +72,14 @@ def sort_keys_length(x: dict[str, T], descending: bool = False) -> dict[str, T]:
 
 
 def guess_mime_type(
-    url: "str | os.PathLike[str]",
+    url: str | os.PathLike[str],
     default: str = "application/octet-stream",
     strict: bool = True,
 ) -> str:
     """
     Guess the MIME type of a file. This is a wrapper for mimetypes.guess_type, but it
     only returns the type (and not encoding), and it allows a default value.
     """
-    # Note that in the parameters above, "os.PathLike[str]" is in quotes to avoid
-    # "TypeError: 'ABCMeta' object is not subscriptable", in Python<=3.8.
     if url:
         # Work around issue #1601, some installations of Windows 10 return text/plain
         # as the mime type for .js files

shiny/render/_render.py

@@ -4,9 +4,6 @@
 import os
 import sys
 import typing
-
-# `typing.Dict` sed for python 3.8 compatibility
-# Can use `dict` in python >= 3.9
 from typing import TYPE_CHECKING, Any, Callable, Literal, Optional, Union, cast
 
 from htmltools import Tag, TagAttrValue, TagChild

tests/pytest/test_chat.py

@@ -1,6 +1,5 @@
 from __future__ import annotations
 
-import sys
 from datetime import datetime
 from typing import Union, cast, get_args, get_origin
 
@@ -202,10 +201,6 @@ def test_langchain_normalization():
 
 
 def test_google_normalization():
-    # Not available for Python 3.8
-    if sys.version_info < (3, 9):
-        return
-
     from google.generativeai import (  # pyright: ignore[reportMissingTypeStubs]
         GenerativeModel,
     )
@@ -362,16 +357,12 @@ def test_as_anthropic_message():
 
 
 def test_as_google_message():
-    from shiny.ui._chat_provider_types import as_google_message
-
-    # Not available for Python 3.8
-    if sys.version_info < (3, 9):
-        return
-
     from google.generativeai import (  # pyright: ignore[reportMissingTypeStubs]
         GenerativeModel,
     )
 
+    from shiny.ui._chat_provider_types import as_google_message
+
     generate_content = GenerativeModel.generate_content  # type: ignore
 
     assert generate_content.__annotations__["contents"] == "content_types.ContentsType"