Fix version handling (#372)

.github/workflows/tests.yml

@@ -19,14 +19,14 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: ["3.8", "3.11"]
+        python-version: ["3.8", "3.12"]
         include:
           - os: windows-latest
             python-version: "3.9"
           - os: ubuntu-latest
             python-version: "pypy-3.8"
           - os: ubuntu-latest
-            python-version: "3.12.0-beta.1"
+            python-version: "3.11"
           - os: macos-latest
             python-version: "3.10"
     steps:

nbformat/_version.py

@@ -1,13 +1,9 @@
 """The version information for nbformat."""
 # Use "hatchling version xx.yy.zz" to handle version changes
 import re
+from importlib.metadata import version
 
-try:
-    from importlib.metadata import version
-except ImportError:
-    from importlib_metadata import version  # type:ignore
-
-__version__ = version("nbformat")
+__version__ = version("nbformat") or "0.0.0"
 
 # matches tbump regex in pyproject.toml
 _version_regex = re.compile(

pyproject.toml

@@ -18,7 +18,8 @@ classifiers = [
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
-    "Programming Language :: Python :: 3.11"
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12"
 ]
 requires-python = ">=3.8"
 dependencies = [
@@ -151,11 +152,11 @@ ignore_missing_imports = true
 [tool.black]
 line-length = 100
 skip-string-normalization = true
-target-version = ["py37"]
+target-version = ["py38"]
 extend-exclude = "^/tests.*ipynb$"
 
 [tool.ruff]
-target-version = "py37"
+target-version = "py38"
 line-length = 100
 select = [
   "A", "B", "C", "DTZ", "E", "EM", "F", "FBT", "I", "ICN", "ISC", "N",