Duplicated alias for commands are skipped

In 3.11 a bug with duplicated names/aliases of subparsers was fixed in
python/cpython#83897. This leads to an argument
error being raised whenever a duplicate is found. In previous python
versions additional parsers were just overridden without a warning.

b2/console_tool.py

@@ -524,13 +524,19 @@ def get_parser(cls, subparsers=None, parents=None, for_docs=False):
             )
         else:
             name, alias = cls.name_and_alias()
-            parser = subparsers.add_parser(
-                name,
-                description=description,
-                parents=parents,
-                aliases=[alias] if alias is not None and not for_docs else (),
-                for_docs=for_docs,
-            )
+            try:
+                parser = subparsers.add_parser(
+                    name,
+                    description=description,
+                    parents=parents,
+                    aliases=[alias] if alias is not None and not for_docs else (),
+                    for_docs=for_docs,
+                )
+            except argparse.ArgumentError:
+                # In 3.11 a bug with duplicated subparsers was fixed https://github.com/python/cpython/issues/83897
+                # This leads to argument error, since all our parsers are registered for both name and alias.
+                # Whenever a name appears again an ArgumentError is raised, and we simply skip it.
+                return
 
         cls._setup_parser(parser)
 

noxfile.py

@@ -8,7 +8,6 @@
 #
 ######################################################################
 
-import io
 import os
 import pkg_resources
 import platform
@@ -24,7 +23,13 @@
 NO_STATICX = os.environ.get('NO_STATICX') is not None
 NOX_PYTHONS = os.environ.get('NOX_PYTHONS')
 
-PYTHON_VERSIONS = ['3.7', '3.8', '3.9', '3.10'] if NOX_PYTHONS is None else NOX_PYTHONS.split(',')
+PYTHON_VERSIONS = [
+    '3.7',
+    '3.8',
+    '3.9',
+    '3.10',
+    '3.11',
+] if NOX_PYTHONS is None else NOX_PYTHONS.split(',')
 PYTHON_DEFAULT_VERSION = PYTHON_VERSIONS[-1]
 
 PY_PATHS = ['b2', 'test', 'noxfile.py', 'setup.py']