Print out encoded samples during python tests

implementations/python/test_preserves.py

@@ -35,10 +35,19 @@ def _d(bs):
     d = Decoder(bs)
     return d.next()
 
+_all_encoded = set()
+
+def tearDownModule():
+    print()
+    for bs in sorted(_all_encoded):
+        print(_hex(bs))
+
 def _e(v):
     e = Encoder()
     e.append(v)
-    return e.contents()
+    bs = e.contents()
+    _all_encoded.add(bs)
+    return bs
 
 def _R(k, *args):
     return Record(Symbol(k), args)