diff --git a/python/test/test_case.py b/python/test/test_case.py
index d754fb0b..a08c6ce1 100644
--- a/python/test/test_case.py
+++ b/python/test/test_case.py
@@ -5,6 +5,7 @@ from nose import main
 from nose.tools import *
 from msgpack import packs, unpacks
 
+
 def check(length, obj):
     v = packs(obj)
     assert_equal(len(v), length, "%r length should be %r but get %r" % (obj, length, len(v)))
@@ -54,7 +55,7 @@ def test_raw32():
 
 
 def check_array(overhead, num):
-    check(num + overhead, [None] * num)
+    check(num + overhead, (None,) * num)
 
 def test_fixarray():
     check_array(1, 0)
@@ -86,9 +87,9 @@ def test_match():
         (-129, '\xd1\xff\x7f'),
         ({1:1}, '\x81\x01\x01'),
         (1.0, "\xcb\x3f\xf0\x00\x00\x00\x00\x00\x00"),
-        ([], '\x90'),
-        (range(15),"\x9f\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e"),
-        (range(16),"\xdc\x00\x10\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f"),
+        ((), '\x90'),
+        (tuple(range(15)),"\x9f\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e"),
+        (tuple(range(16)),"\xdc\x00\x10\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f"),
         ({}, '\x80'),
         (dict([(x,x) for x in range(15)]), '\x8f\x00\x00\x01\x01\x02\x02\x03\x03\x04\x04\x05\x05\x06\x06\x07\x07\x08\x08\t\t\n\n\x0b\x0b\x0c\x0c\r\r\x0e\x0e'),
         (dict([(x,x) for x in range(16)]), '\xde\x00\x10\x00\x00\x01\x01\x02\x02\x03\x03\x04\x04\x05\x05\x06\x06\x07\x07\x08\x08\t\t\n\n\x0b\x0b\x0c\x0c\r\r\x0e\x0e\x0f\x0f'),
diff --git a/python/test/test_format.py b/python/test/test_format.py
index 009a7646..562ef54a 100644
--- a/python/test/test_format.py
+++ b/python/test/test_format.py
@@ -10,21 +10,21 @@ def check(src, should):
 
 def testSimpleValue():
     check("\x93\xc0\xc2\xc3", 
-            [None, False, True])
+            (None, False, True,))
 
 def testFixnum():
     check("\x92\x93\x00\x40\x7f\x93\xe0\xf0\xff",
-          [[0,64,127], [-32,-16,-1]]
+          ((0,64,127,), (-32,-16,-1,),)
           )
 
 def testFixArray():
     check("\x92\x90\x91\x91\xc0",
-          [[],[[None]]],
+          ((),((None,),),),
           )
 
 def testFixRaw():
     check("\x94\xa0\xa1a\xa2bc\xa3def",
-          ["", "a", "bc", "def"],
+          ("", "a", "bc", "def",),
           )
 
 def testFixMap():
@@ -38,25 +38,26 @@ def testUnsignedInt():
           "\x99\xcc\x00\xcc\x80\xcc\xff\xcd\x00\x00\xcd\x80\x00"
           "\xcd\xff\xff\xce\x00\x00\x00\x00\xce\x80\x00\x00\x00"
           "\xce\xff\xff\xff\xff",
-          [0, 128, 255, 0, 32768, 65535, 0, 2147483648, 4294967295],
+          (0, 128, 255, 0, 32768, 65535, 0, 2147483648, 4294967295,),
           )
 
 def testSignedInt():
     check("\x99\xd0\x00\xd0\x80\xd0\xff\xd1\x00\x00\xd1\x80\x00"
           "\xd1\xff\xff\xd2\x00\x00\x00\x00\xd2\x80\x00\x00\x00"
           "\xd2\xff\xff\xff\xff",
-          [0, -128, -1, 0, -32768, -1, 0, -2147483648, -1])
+          (0, -128, -1, 0, -32768, -1, 0, -2147483648, -1,))
 
 def testRaw():
     check("\x96\xda\x00\x00\xda\x00\x01a\xda\x00\x02ab\xdb\x00\x00"
         "\x00\x00\xdb\x00\x00\x00\x01a\xdb\x00\x00\x00\x02ab",
-        ["", "a", "ab", "", "a", "ab"])
+        ("", "a", "ab", "", "a", "ab"))
 
 def testArray():
     check("\x96\xdc\x00\x00\xdc\x00\x01\xc0\xdc\x00\x02\xc2\xc3\xdd\x00"
         "\x00\x00\x00\xdd\x00\x00\x00\x01\xc0\xdd\x00\x00\x00\x02"
         "\xc2\xc3",
-        [[], [None], [False,True], [], [None], [False,True]])
+        ((), (None,), (False,True), (), (None,), (False,True))
+        )
 
 def testMap():
     check(
@@ -67,8 +68,8 @@ def testMap():
             "\xdf\x00\x00\x00\x00"
             "\xdf\x00\x00\x00\x01\xc0\xc2"
             "\xdf\x00\x00\x00\x02\xc0\xc2\xc3\xc2",
-        [{}, {None: False}, {True: False, None: False}, {},
-            {None: False}, {True: False, None: False}])
+        ({}, {None: False}, {True: False, None: False}, {},
+            {None: False}, {True: False, None: False}))
 
 if __name__ == '__main__':
     main()
diff --git a/python/test/test_pack.py b/python/test/test_pack.py
index 86badb5d..5dec0680 100644
--- a/python/test/test_pack.py
+++ b/python/test/test_pack.py
@@ -17,7 +17,7 @@ def testPack():
             1.0,
         "", "a", "a"*31, "a"*32,
         None, True, False,
-        [], [[]], [[], None], 
+        (), ((),), ((), None,), 
         {None: 0}, 
         (1<<23), 
         ]