Increase minimum version of Python to 3.9 (#77)

.github/workflows/tests.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ "3.12", "3.8" ]
+        python-version: [ "3.12", "3.9" ]
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python-version }}
@@ -34,7 +34,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ "3.12", "3.8" ]
+        python-version: [ "3.12", "3.9" ]
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python-version }}
@@ -55,7 +55,7 @@ jobs:
     strategy:
       matrix:
         os: [ ubuntu-latest, windows-latest, macos-latest ]
-        python-version: [ "3.8", "3.9", "3.10", "3.11", "3.12" ]
+        python-version: [ "3.9", "3.10", "3.11", "3.12" ]
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python-version }}

pyproject.toml

@@ -5,7 +5,7 @@ build-backend = "setuptools.build_meta:__legacy__"
 
 [tool.black]
 line-length = 100
-target-version = ["py38", "py39", "py310", "py311", "py312"]
+target-version = ["py39", "py310", "py311", "py312"]
 
 [tool.isort]
 profile = "black"

setup.cfg

@@ -32,7 +32,6 @@ classifiers =
     License :: OSI Approved :: MIT License
     Operating System :: OS Independent
     Programming Language :: Python
-    Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
@@ -44,13 +43,12 @@ keywords =
 
 [options]
 install_requires =
-    pickle5; python_version < "3.8"
     click
     requests
     tqdm
 
 zip_safe = false
-python_requires = >=3.7
+python_requires = >=3.9
 
 # Where is my code
 packages = find:

src/pystow/cache.py

@@ -5,6 +5,7 @@
 import functools
 import json
 import logging
+import pickle
 from abc import ABC, abstractmethod
 from pathlib import Path
 from typing import (
@@ -21,11 +22,6 @@
     cast,
 )
 
-try:
-    import pickle5 as pickle
-except ImportError:
-    import pickle
-
 if TYPE_CHECKING:
     import pandas as pd