Added \versionchanged comment to os.popen() noting that it was unreliable
in earlier versions of Python; this is useful information for people
interested in writing code that is portable across Python versions.
Suggested by Peter Funk <pf@artcom-gmbh.de>.
diff --git a/Doc/lib/libos.tex b/Doc/lib/libos.tex
index 0586905..073d859 100644
--- a/Doc/lib/libos.tex
+++ b/Doc/lib/libos.tex
@@ -284,6 +284,12 @@
object, except that when the exit status is zero (termination without
errors), \code{None} is returned.
Availability: \UNIX{}, Windows.
+
+\versionchanged[This function worked unreliably under Windows in
+ earlier versions of Python. This was due to the use of the
+ \cfunction{_popen()} function from the libraries provided with
+ Windows. Newer versions of Python do not use the broken
+ implementation from the Windows libraries]{2.0}
\end{funcdesc}
\begin{funcdesc}{tmpfile}{}