From a623ca8f8032d0b8b1312e5eb0d0c799922f5efd Mon Sep 17 00:00:00 2001
From: Fred Drake <fdrake@acm.org>
Date: Mon, 11 Jun 2001 14:57:07 +0000
Subject: [PATCH] Merge in recent changes from development branch:  add warning
 about being sure that code only runs once when using the module as both a
 module and a script.

---
 Doc/lib/libdoctest.tex | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Doc/lib/libdoctest.tex b/Doc/lib/libdoctest.tex
index 6d19259d257e..9b99b9d51d25 100644
--- a/Doc/lib/libdoctest.tex
+++ b/Doc/lib/libdoctest.tex
@@ -406,6 +406,17 @@ often contrive doctest examples to produce numbers of that form:
 
 Simple fractions are also easier for people to understand, and that makes
 for better documentation.
+
+\item Be careful if you have code that must only execute once.
+
+If you have module-level code that must only execute once, a more foolproof
+definition of \function{_test()} is
+
+\begin{verbatim}
+def _test():
+    import doctest, sys
+    doctest.testmod(sys.modules["__main__"])
+\end{verbatim}
 \end{enumerate}
 
 
-- 
2.47.3