bpo-16355: Clarify when inspect.getcomments() returns None (#428) (#690)
Initial patch by Vajrasky Kok.
(cherry picked from commit 3f2155ffe683080f2a1b28408fa48d43ba92f943)
diff --git a/Doc/library/inspect.rst b/Doc/library/inspect.rst
index 3fa44a0..4ff2187 100644
--- a/Doc/library/inspect.rst
+++ b/Doc/library/inspect.rst
@@ -442,7 +442,9 @@
Return in a single string any lines of comments immediately preceding the
object's source code (for a class, function, or method), or at the top of the
- Python source file (if the object is a module).
+ Python source file (if the object is a module). If the object's source code
+ is unavailable, return ``None``. This could happen if the object has been
+ defined in C or the interactive shell.
.. function:: getfile(object)