Skip pinning of deps when running python >= 3.12

charmtools/build/tactics.py

@@ -1253,6 +1253,9 @@ def __call__(self):
             ).exit_on_error()()
         if self.upgrade_deps:
             utils.upgrade_venv_core_packages(self._venv, env=self._get_env())
+        elif utils.get_python_version(self._venv,
+                                      env=self._get_env()) >= utils.PY312:
+            pass
         else:
             utils.pin_setuptools_for_pep440(self._venv, env=self._get_env())
         log.debug(

charmtools/utils.py

@@ -20,6 +20,7 @@
 from path import Path as path
 
 log = logging.getLogger('utils')
+PY312 = (3, 12, 0)
 
 
 @contextmanager
@@ -702,3 +703,24 @@ def get_venv_package_list(venv_dir, env=None):
     if result:
         return result.output
     result.exit_on_error()
+
+
+def get_python_version(venv_dir, env=None):
+    """Get the Python interpreter version in the virtualenv.
+
+    :param venv_dir: Full path to virtualenv in which packages will be listed
+    :type venv_dir: str
+    :param env: Environment to use when executing command
+    :type env: Optional[Dict[str,str]]
+    :returns: Tuple with major, minor and microversion
+    :rtype: Tuple[str]
+    """
+    result = Process((os.path.join(venv_dir, 'bin/python3'), '--version'),
+                     env=env)()
+    m = re.match(r'^Python[ ]+(\d+)\.(\d+)\.(\d+).*', result)
+    if not m:
+        raise ValueError('Cannot identify the python version: %s' % result)
+
+    return (int(m.group(1)),
+            int(m.group(2)),
+            int(m.group(3)))