Try something else

examples/libcalc/py_over_so.py

@@ -1,30 +1,19 @@
-# Copied from https://stackoverflow.com/questions/56074754/python-force-import-to-prefer-py-over-so
-import glob, importlib, importlib.util, sys
-
-def hook(name):
-    if name != '.':
-        raise ImportError()
-    modnames = set(f.rstrip('.py') for f in glob.glob('*.py'))
-    return Finder(modnames)
-sys.path_hooks.insert(1, hook)
-sys.path.insert(0, '.')
-
-class Finder(object):
-    def __init__(self, modnames):
-        self.modnames = modnames
-    def find_spec(self, modname, target=None):
-        if modname in self.modnames:
-            origin = './' + modname + '.py'
-            loader = Loader()
-            return importlib.util.spec_from_loader(modname, loader, origin=origin)
-        else:
-            return None
-
-class Loader(object):
-    def create_module(self, target):
-        return None
-    def exec_module(self, module):
-        with open(module.__spec__.origin, 'r', encoding='utf-8') as f:
-            code = f.read()
-        compile(code, module.__spec__.origin, 'exec')
-        exec(code, module.__dict__)
+from importlib.abc import Loader, MetaPathFinder
+from importlib.util import module_from_spec, spec_from_file_location
+import sys
+
+
+overridden_modules = []
+
+
+def override_module(name):
+    overriden_modules += name
+
+
+class PyFinder(MetaPathFinder):
+    def find_spec(self, fullname, path, target=None):
+        if fullname in overridden_modules:
+            return spec_from_file_location(fullname, "./%s.py" % fullname)
+
+
+sys.meta_path.insert(0, PyFinder())