Add importlib pointer

Author: jeanas

source/discussions/distribution-package-vs-import-package.rst

@@ -82,7 +82,7 @@ How do distribution package names and import package names compare?
 
 Import packages should have valid Python identifiers as their name (the
 :ref:`exact rules <python:identifiers>` are found in the Python
-documentation). In particular, they use underscores ``_`` as word
+documentation) #[non-identifier-mod-name]_. In particular, they use underscores ``_`` as word
 separator and they are case-sensitive.
 
 On the other hand, distribution packages can use hyphens ``-`` or
@@ -95,6 +95,16 @@ precise rules are given in the :ref:`name normalization specification
 <name-normalization>`).
 
 
+
+-
+---------------------------
+
+.. [#non-identifier-mod-name] Although is technically possible
+   to import packages/modules that do not have a valid Python identifier as
+   their name, using :doc:`importlib <python:library/importlib>`,
+   this is vanishingly rare and strongly discouraged.
+
+
 .. _distro: https://en.wikipedia.org/wiki/Linux_distribution
 .. _PyPI: https://pypi.org
 .. _Pillow: https://pypi.org/project/Pillow