Expose Subversion revision number (calculated via "svnversion .") to Python.
Add C API function Py_GetBuildNumber(), add it to the interactive prompt
banner (i.e. Py_GetBuildInfo()), and add it as the sys.build_number
attribute. The build number is a string instead of an int because it may
contain a trailing 'M' if there are local modifications.
diff --git a/Doc/lib/libsys.tex b/Doc/lib/libsys.tex
index 4efe5f6..7ffa35d 100644
--- a/Doc/lib/libsys.tex
+++ b/Doc/lib/libsys.tex
@@ -27,6 +27,12 @@
\versionadded{2.0}
\end{datadesc}
+\begin{datadesc}{build_number}
+ A string representing the Subversion revision that this Python executable
+ was built from. This number is a string because it may contain a trailing
+ 'M' if Python was built from a mixed revision source tree.
+\end{datadesc}
+
\begin{datadesc}{builtin_module_names}
A tuple of strings giving the names of all modules that are compiled
into this Python interpreter. (This information is not available in