Note that sys._getframe is not guaranteed to exist in all implementations of Python...

diff --git a/Doc/library/inspect.rst b/Doc/library/inspect.rst
index bea12c9f634bf5157203643d721d1dcd4bf63527..ac89850639f3270b1747785dc171b61f2f5cf6dc 100644 (file)
--- a/Doc/library/inspect.rst
+++ b/Doc/library/inspect.rst
@@ -567,6 +567,11 @@ line.
 
    Return the frame object for the caller's stack frame.
 
+   This function relies on Python stack frame support in the interpreter, which
+   isn't guaranteed to exist in all implementations of Python. If running in
+   an implmentation without Python stack frame support this function returns
+   ``None``.
+
 
 .. function:: stack([context])
 

diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
index 0005792774eb1b8a6ae09eb4109fa8c6f6523b04..7a3f642e4219a21241184b9037f25ca17039d4e2 100644 (file)
--- a/Doc/library/sys.rst
+++ b/Doc/library/sys.rst
@@ -417,7 +417,8 @@ always available.
    that is deeper than the call stack, :exc:`ValueError` is raised.  The default
    for *depth* is zero, returning the frame at the top of the call stack.
 
-   This function should be used for internal and specialized purposes only.
+   This function should be used for internal and specialized purposes only. It
+   is not guaranteed to exist in all implementations of Python.
 
 
 .. function:: getprofile()