diff -r 6b70f16d585a Lib/tarfile.py
--- a/Lib/tarfile.py	Wed Apr 15 10:27:58 2015 -0400
+++ b/Lib/tarfile.py	Wed Apr 15 22:44:52 2015 -0500
@@ -64,7 +64,10 @@
     pass
 
 # from tarfile import *
-__all__ = ["TarFile", "TarInfo", "is_tarfile", "TarError"]
+__all__ = ["TarFile", "TarInfo", "is_tarfile", "TarError", "ReadError",
+           "CompressionError", "StreamError", "ExtractError", "HeaderError",
+           "ENCODING", "USTAR_FORMAT", "GNU_FORMAT", "PAX_FORMAT",
+           "DEFAULT_FORMAT", "open"]
 
 #---------------------------------------------------------
 # tar constants
diff -r 6b70f16d585a Lib/test/test_tarfile.py
--- a/Lib/test/test_tarfile.py	Wed Apr 15 10:27:58 2015 -0400
+++ b/Lib/test/test_tarfile.py	Wed Apr 15 22:44:52 2015 -0500
@@ -1962,6 +1962,32 @@
         with self.assertRaises(ValueError):
             tarfile.itn(0x10000000000, 6, tarfile.GNU_FORMAT)
 
+    def test_all(self):
+        blacklist = {'REGTYPE', 'bltn_open', 'LNKTYPE', 'symlink_exception',
+                     'FIFOTYPE', 'BLOCKSIZE', 'PAX_NUMBER_FIELDS',
+                     'AREGTYPE', 'version', 'LENGTH_NAME', 'LENGTH_PREFIX',
+                     'GNUTYPE_LONGNAME', 'LENGTH_LINK', 'GNU_MAGIC',
+                     'GNU_TYPES', 'SOLARIS_XHDTYPE', 'RECORDSIZE', 'NUL',
+                     'CONTTYPE', 'GNUTYPE_SPARSE', 'PAX_FIELDS',
+                     'DIRTYPE', 'POSIX_MAGIC', 'GNUTYPE_LONGLINK',
+                     'XGLTYPE', 'CHRTYPE', 'SYMTYPE', 'XHDTYPE',
+                     'REGULAR_TYPES', 'PAX_NAME_FIELDS', 'BLKTYPE',
+                     'SUPPORTED_TYPES', 'nts', 'main', 'EOFHeaderError',
+                     'TruncatedHeaderError', 'InvalidHeaderError',
+                     'ExFileObject', 'EmptyHeaderError', 'itn',
+                     'calc_chksums', 'copyfileobj', 'TarIter',
+                     'SubsequentHeaderError', 'nti', 'stn', 'filemode'}
+        exported = set(tarfile.__all__)
+        possible_exports = set()
+        import types
+        for name, value in tarfile.__dict__.items():
+            if name.startswith('_'):
+                continue
+            if isinstance(value, (types.ModuleType,)):
+                continue
+            possible_exports.add(name)
+        self.assertEqual(exported, possible_exports - blacklist)
+
 
 class CommandLineTest(unittest.TestCase):