packaging is a dependency

pyproject.toml

@@ -32,10 +32,11 @@ classifiers = [
 ]
 dependencies = [
     "nbformat",
-    "pyyaml",
-    "toml",
     "mdit_py_plugins",
     "markdown-it-py>=1.0.0",
+    "packaging",
+    "pyyaml",
+    "toml",
 ]
 dynamic = ["version"]
 

src/jupytext/cell_reader.py

@@ -5,16 +5,16 @@
 from copy import copy
 
 from nbformat.v4.nbbase import new_code_cell, new_markdown_cell, new_raw_cell
+from packaging.version import parse
 
 from .doxygen import doxygen_to_markdown
 from .languages import _SCRIPT_EXTENSIONS
-from .parse_version import parse_version
 
 # Sphinx Gallery is an optional dependency. And we intercept the SyntaxError for #301
 try:
     from sphinx_gallery import __version__ as sg_version
 
-    if parse_version(sg_version) <= parse_version("0.7.0"):
+    if parse(sg_version) <= parse("0.7.0"):
         from sphinx_gallery.notebook import rst2md
     else:
         warnings.warn(

src/jupytext/pandoc.py

@@ -8,8 +8,7 @@
 # Copy nbformat reads and writes to avoid them being patched in the contents manager!!
 from nbformat import reads as ipynb_reads
 from nbformat import writes as ipynb_writes
-
-from .parse_version import parse_version as parse
+from packaging.version import parse
 
 
 class PandocError(OSError):

src/jupytext/quarto.py

@@ -8,8 +8,7 @@
 # Copy nbformat reads and writes to avoid them being patched in the contents manager!!
 from nbformat import reads as ipynb_reads
 from nbformat import writes as ipynb_writes
-
-from .parse_version import parse_version as parse
+from packaging.version import parse
 
 QUARTO_MIN_VERSION = "0.2.134"