Merged revisions 86223-86224,86226,86234 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r86223 | eric.araujo | 2010-11-06 00:51:56 +0100 (sam., 06 nov. 2010) | 2 lines

  Always close files in distutils code and tests (#10252).
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  r86224 | eric.araujo | 2010-11-06 00:58:34 +0100 (sam., 06 nov. 2010) | 2 lines

  Add missing entry for r86223.
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  r86226 | eric.araujo | 2010-11-06 00:59:32 +0100 (sam., 06 nov. 2010) | 2 lines

  Of course, I forgot one file in r86223.
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  r86234 | eric.araujo | 2010-11-06 03:10:32 +0100 (sam., 06 nov. 2010) | 2 lines

  Also close file descriptors from os.popen and subprocess.Popen
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diff --git a/Lib/sysconfig.py b/Lib/sysconfig.py
index c40bb03..33b2791 100644
--- a/Lib/sysconfig.py
+++ b/Lib/sysconfig.py
@@ -635,13 +635,16 @@
                 # behaviour.
                 pass
             else:
-                m = re.search(
-                        r'<key>ProductUserVisibleVersion</key>\s*' +
-                        r'<string>(.*?)</string>', f.read())
-                f.close()
-                if m is not None:
-                    macrelease = '.'.join(m.group(1).split('.')[:2])
-                # else: fall back to the default behaviour
+                try:
+                    m = re.search(
+                            r'<key>ProductUserVisibleVersion</key>\s*' +
+                            r'<string>(.*?)</string>', f.read())
+                    f.close()
+                    if m is not None:
+                        macrelease = '.'.join(m.group(1).split('.')[:2])
+                    # else: fall back to the default behaviour
+                finally:
+                    f.close()
 
         if not macver:
             macver = macrelease