Some changes

1. Add a NEWS entry

2. __import__ and find_module will now normalize their
   arguments as needed

3. Update the importlib documentation to note that the
   name passed to finders must be normalized.

Author: ronaldoussoren

Doc/library/importlib.rst

@@ -256,6 +256,9 @@ ABC hierarchy::
       :func:`importlib.util.spec_from_loader` may be useful for implementing
       concrete ``MetaPathFinders``.
 
+      *Fullname* must be normalized in NFKC to match the normalization
+      done by the Python parser.
+
       .. versionadded:: 3.4
 
    .. method:: invalidate_caches()
@@ -290,6 +293,9 @@ ABC hierarchy::
       guess about what spec to return. :func:`importlib.util.spec_from_loader`
       may be useful for implementing concrete ``PathEntryFinders``.
 
+      *Fullname* must be normalized in NFKC to match the normalization
+      done by the Python parser.
+
       .. versionadded:: 3.4
 
    .. method:: invalidate_caches()

Lib/importlib/_bootstrap.py

@@ -26,6 +26,13 @@ def _object_name(obj):
     except AttributeError:
         return type(obj).__qualname__
 
+def _normalize(name):
+    """ Normalize 'name' in NKFC form """
+    global _unicodedata_normalize
+    if _unicodedata_normalize is None:
+        from unicodedata import _normalize
+    return _unicodedata_normalize('NFKC', name)
+
 # Bootstrap-related code ######################################################
 
 # Modules injected manually by _setup()
@@ -36,6 +43,8 @@ def _object_name(obj):
 # Import done by _install_external_importers()
 _bootstrap_external = None
 
+# Import done as needed by _normalize
+_unicodedata_normalize = None
 
 def _wrap(new, old):
     """Simple substitute for functools.update_wrapper."""
@@ -1381,7 +1390,15 @@ def _gcd_import(name, package=None, level=0):
     the loader did not.
 
     """
+    global _unicodedata
     _sanity_check(name, package, level)
+
+    if not name.isascii():
+        name = _normalize(name)
+
+    if package is not None and not package.isascii():
+        package = _normalize(package)
+
     if level > 0:
         name = _resolve_name(name, package, level)
     return _find_and_load(name, _gcd_import)

Misc/NEWS.d/next/Library/2023-12-29-13-09-44.gh-issue-84013.rUaxkr.rst

@@ -0,0 +1,3 @@
+It is now possible to import modules from the filesystem regardless of how
+the name is normalized in the filesystem. This in particular affects
+importing modules with a name that contains accented latin characters.