allow alternative extensions to .py

split_settings/tools.py

@@ -11,7 +11,9 @@
 import inspect
 import os
 import sys
-from importlib.util import module_from_spec, spec_from_file_location
+from importlib.util import module_from_spec, spec_from_loader
+from importlib.machinery import SourceFileLoader
+
 
 __all__ = ('optional', 'include')  # noqa: WPS410
 
@@ -114,8 +116,9 @@ def include(*args: str, **kwargs) -> None:  # noqa: WPS210, WPS231, C901
                 rel_path[:rel_path.rfind('.')].replace('/', '.'),
             )
 
-            spec = spec_from_file_location(
-                module_name, included_file,
+            spec = spec_from_loader(
+                module_name,
+                SourceFileLoader(os.path.basename(included_file).split('.')[0], included_file),
             )
             module = module_from_spec(spec)
             sys.modules[module_name] = module

tests/test_split_settings.py

@@ -12,7 +12,7 @@ def test_alt_ext(alt_ext):
     assert alt_ext.NO_EXT_INCLUDED
     assert alt_ext.DOT_CONF_INCLUDED
     assert alt_ext.DOUBLE_EXT_INCLUDED
-    assert alt_ext.OPTIONAl_INCLUDED
+    assert alt_ext.OPTIONAL_INCLUDED
 
 
 def test_override(merged, monkeypatch):