feat(python-namespaces)!: add validation for namespace names

Added more strict validation for namespaces names to PythonNamespace
than before and updated error messages.
All tests depending on this were updated to the new behavior.

tests/unit/core/python/namespaces/test_PythonModuleNamespace.py

@@ -28,7 +28,6 @@ class StrSubclass(str): ...
     'namespace,expected_name',
     [
         (PythonModuleNamespace('a'), 'a'),
-        (PythonModuleNamespace('1'), '1'),
         (PythonModuleNamespace(StrSubclass('a')), StrSubclass('a')),
     ],
 )
@@ -41,11 +40,7 @@ def test_PythonModuleNamespace_name_attribute(namespace, expected_name):
     [
         (PythonModuleNamespace('a'), PythonModuleNamespace('a'), True),
         (PythonModuleNamespace('b'), PythonModuleNamespace('b'), True),
-        (PythonModuleNamespace('1'), PythonModuleNamespace('1'), True),
-        (PythonModuleNamespace('42'), PythonModuleNamespace('42'), True),
         (PythonModuleNamespace('a'), PythonModuleNamespace('b'), False),
-        (PythonModuleNamespace('0'), PythonModuleNamespace('-0'), False),
-        (PythonModuleNamespace('1'), PythonModuleNamespace('a'), False),
         (PythonModuleNamespace('a'), 'a', False),
         (PythonModuleNamespace('a'), 'b', False),
         (PythonModuleNamespace('a'), PythonPackageNamespace('a', []), False),
@@ -61,7 +56,6 @@ def test_PythonModuleNamespace___eq__(namespace1, namespace2, expected):
     'namespace,expected',
     [
         (PythonModuleNamespace('a'), "PythonModuleNamespace('a')"),
-        (PythonModuleNamespace('1'), "PythonModuleNamespace('1')"),
         (
             PythonModuleNamespace(StrSubclass('a')),
             "PythonModuleNamespace('a')",

tests/unit/core/python/namespaces/test_PythonNamespace.py

@@ -24,7 +24,6 @@ class StrSubclass(str): ...
     'namespace,expected_name',
     [
         (PythonNamespace('a'), 'a'),
-        (PythonNamespace('1'), '1'),
         (PythonNamespace(StrSubclass('a')), StrSubclass('a')),
     ],
 )
@@ -36,7 +35,6 @@ def test_PythonNamespace_name_attribute(namespace, expected_name):
     'namespace,expected',
     [
         (PythonNamespace('a'), "PythonNamespace('a')"),
-        (PythonNamespace('1'), "PythonNamespace('1')"),
         (PythonNamespace(StrSubclass('a')), "PythonNamespace('a')"),
     ],
 )

tests/unit/core/python/namespaces/test_PythonPackageNamespace.py

@@ -38,13 +38,6 @@ class StrSubclass(str): ...
             ),
             'a',
         ),
-        (
-            PythonPackageNamespace(
-                '1',
-                [],
-            ),
-            '1',
-        ),
         (
             PythonPackageNamespace(
                 StrSubclass('a'),
@@ -291,10 +284,6 @@ def test_PythonPackageNamespace___eq__(namespace1, namespace2, expected):
             PythonPackageNamespace('a', []),
             "PythonPackageNamespace('a', [])",
         ),
-        (
-            PythonPackageNamespace('1', []),
-            "PythonPackageNamespace('1', [])",
-        ),
         (
             PythonPackageNamespace(StrSubclass('a'), []),
             "PythonPackageNamespace('a', [])",