Show make Python exceptions visible executing `ob-python' blocks

README.org

@@ -3650,6 +3650,43 @@ define the [[https://orgmode.org/][Org mode]] =kbd= macro in listing
      (latex (format "@@latex:\\colorbox{PowderBlue}{\\texttt{%s}}@@" keys)))))
 #+end_src
 
+*** Handle Python exceptions in ~ob-python~
+:PROPERTIES:
+:CUSTOM_ID: sec:handle-python-exceptions
+:END:
+
+Python exceptions are never visible while executing Python ~org-src-mode~
+blocks.  Redirecting Python exceptions is a way to make them visible.  Listing
+[[lst:redirect-python-exceptions]] redirects Python exceptions to the file
+~stderr.arm~, listing [[lst:open-python-exceptions]] opens the file ~stderr.arm~ in
+~auto-revert-mode~, and listing [[lst:demo-python-exceptions]] demonstrates the
+redirection of Python exceptions to the file ~stderr.arm~.
+
+#+caption[Redirect Python exceptions to a file]:
+#+caption: Redirect Python exceptions to a file:
+#+name: lst:redirect-python-exceptions
+#+begin_src python -i -n :results silent :session :tangle no
+import sys
+
+file = open("stderr.arm", "w")
+sys.stderr = file
+#+end_src
+
+#+caption[Open the redirected file in ~auto-revert-mode~]:
+#+caption: Open the redirected file in ~auto-revert-mode~.
+#+name: lst:open-python-exceptions
+#+begin_src emacs-lisp -n :results silent :tangle no
+(find-file "stderr.arm")
+(auto-revert-mode)
+#+end_src
+
+#+caption[Demonstrate the redirection of Python exceptions to a file]:
+#+caption: Demonstrate the redirectio of Python exceptions to a file.
+#+name: lst:demo-python-exceptions
+#+begin_src python -i -n :results silent :session :tangle no
+variable
+#+end_src
+
 *** [[https://orgmode.org/worg/org-tests/index.html][Testing Org]]
 :PROPERTIES:
 :CUSTOM_ID: sec:testing-org