diff --git a/python/msgpack/_msgpack.pyx b/python/msgpack/_msgpack.pyx
index 85d717e6..c887127b 100644
--- a/python/msgpack/_msgpack.pyx
+++ b/python/msgpack/_msgpack.pyx
@@ -12,7 +12,7 @@ cdef extern from "Python.h":
     cdef unsigned long long PyLong_AsUnsignedLongLong(object o)
 
     cdef bint PyBool_Check(object o)
-    cdef bint PyMapping_Check(object o)
+    cdef bint PyDict_Check(object o)
     cdef bint PySequence_Check(object o)
     cdef bint PyLong_Check(object o)
     cdef bint PyInt_Check(object o)
@@ -69,13 +69,14 @@ cdef class Packer(object):
     def __dealloc__(self):
         free(self.pk.buf);
 
-    cdef int __pack(self, object o) except -1:
+    cdef int _pack(self, object o) except -1:
         cdef long long llval
         cdef unsigned long long ullval
         cdef long longval
         cdef double fval
         cdef char* rawval 
         cdef int ret
+        cdef dict d
 
         if o is None:
             ret = msgpack_pack_nil(&self.pk)
@@ -109,19 +110,20 @@ cdef class Packer(object):
             ret = msgpack_pack_raw(&self.pk, len(o))
             if ret == 0:
                 ret = msgpack_pack_raw_body(&self.pk, rawval, len(o))
-        elif PyMapping_Check(o):
-            ret = msgpack_pack_map(&self.pk, len(o))
+        elif PyDict_Check(o):
+            d = o
+            ret = msgpack_pack_map(&self.pk, len(d))
             if ret == 0:
-                for k,v in o.iteritems():
-                    ret = self.__pack(k)
+                for k,v in d.items():
+                    ret = self._pack(k)
                     if ret != 0: break
-                    ret = self.__pack(v)
+                    ret = self._pack(v)
                     if ret != 0: break
         elif PySequence_Check(o):
             ret = msgpack_pack_array(&self.pk, len(o))
             if ret == 0:
                 for v in o:
-                    ret = self.__pack(v)
+                    ret = self._pack(v)
                     if ret != 0: break
         else:
             # TODO: Serialize with defalt() like simplejson.
@@ -130,7 +132,7 @@ cdef class Packer(object):
 
     def pack(self, object obj):
         cdef int ret
-        ret = self.__pack(obj)
+        ret = self._pack(obj)
         if ret:
             raise TypeError
         buf = PyBytes_FromStringAndSize(self.pk.buf, self.pk.length)
diff --git a/python/test3/test_case.py b/python/test3/test_case.py
new file mode 100644
index 00000000..53dfcaf0
--- /dev/null
+++ b/python/test3/test_case.py
@@ -0,0 +1,102 @@
+#!/usr/bin/env python
+# coding: utf-8
+
+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)))
+    assert_equal(unpacks(v), obj)
+
+def test_1():
+    for o in [None, True, False, 0, 1, (1 << 6), (1 << 7) - 1, -1,
+              -((1<<5)-1), -(1<<5)]:
+        check(1, o)
+
+def test_2():
+    for o in [1 << 7, (1 << 8) - 1,
+              -((1<<5)+1), -(1<<7)
+             ]:
+        check(2, o)
+
+def test_3():
+    for o in [1 << 8, (1 << 16) - 1,
+              -((1<<7)+1), -(1<<15)]:
+        check(3, o)
+
+def test_5():
+    for o in [1 << 16, (1 << 32) - 1,
+              -((1<<15)+1), -(1<<31)]:
+        check(5, o)
+
+def test_9():
+    for o in [1 << 32, (1 << 64) - 1,
+              -((1<<31)+1), -(1<<63),
+              1.0, 0.1, -0.1, -1.0]:
+        check(9, o)
+
+
+def check_raw(overhead, num):
+    check(num + overhead, b" " * num)
+
+def test_fixraw():
+    check_raw(1, 0)
+    check_raw(1, (1<<5) - 1)
+
+def test_raw16():
+    check_raw(3, 1<<5)
+    check_raw(3, (1<<16) - 1)
+
+def test_raw32():
+    check_raw(5, 1<<16)
+
+
+def check_array(overhead, num):
+    check(num + overhead, (None,) * num)
+
+def test_fixarray():
+    check_array(1, 0)
+    check_array(1, (1 << 4) - 1)
+
+def test_array16():
+    check_array(3, 1 << 4)
+    check_array(3, (1<<16)-1)
+
+def test_array32():
+    check_array(5, (1<<16))
+
+
+def match(obj, buf):
+    assert_equal(packs(obj), buf)
+    assert_equal(unpacks(buf), obj)
+
+def test_match():
+    cases = [
+        (None, b'\xc0'),
+        (False, b'\xc2'),
+        (True, b'\xc3'),
+        (0, b'\x00'),
+        (127, b'\x7f'),
+        (128, b'\xcc\x80'),
+        (256, b'\xcd\x01\x00'),
+        (-1, b'\xff'),
+        (-33, b'\xd0\xdf'),
+        (-129, b'\xd1\xff\x7f'),
+        ({1:1}, b'\x81\x01\x01'),
+        (1.0, b"\xcb\x3f\xf0\x00\x00\x00\x00\x00\x00"),
+        ((), b'\x90'),
+        (tuple(range(15)),b"\x9f\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e"),
+        (tuple(range(16)),b"\xdc\x00\x10\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f"),
+        ({}, b'\x80'),
+        (dict([(x,x) for x in range(15)]), b'\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)]), b'\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'),
+        ]
+
+    for v, p in cases:
+        match(v, p)
+
+if __name__ == '__main__':
+    main()
diff --git a/python/test3/test_except.py b/python/test3/test_except.py
new file mode 100644
index 00000000..574728fb
--- /dev/null
+++ b/python/test3/test_except.py
@@ -0,0 +1,14 @@
+#!/usr/bin/env python
+# coding: utf-8
+
+from nose.tools import *
+from msgpack import packs, unpacks
+
+import datetime
+
+def test_raise_on_find_unsupported_value():
+    assert_raises(TypeError, packs, datetime.datetime.now())
+
+if __name__ == '__main__':
+    from nose import main
+    main()
diff --git a/python/test3/test_format.py b/python/test3/test_format.py
new file mode 100644
index 00000000..022e6801
--- /dev/null
+++ b/python/test3/test_format.py
@@ -0,0 +1,75 @@
+#!/usr/bin/env python
+# coding: utf-8
+
+from nose import main
+from nose.tools import *
+from msgpack import unpacks
+
+def check(src, should):
+    assert_equal(unpacks(src), should)
+
+def testSimpleValue():
+    check(b"\x93\xc0\xc2\xc3", 
+            (None, False, True,))
+
+def testFixnum():
+    check(b"\x92\x93\x00\x40\x7f\x93\xe0\xf0\xff",
+          ((0,64,127,), (-32,-16,-1,),)
+          )
+
+def testFixArray():
+    check(b"\x92\x90\x91\x91\xc0",
+          ((),((None,),),),
+          )
+
+def testFixRaw():
+    check(b"\x94\xa0\xa1a\xa2bc\xa3def",
+          (b"", b"a", b"bc", b"def",),
+          )
+
+def testFixMap():
+    check(
+          b"\x82\xc2\x81\xc0\xc0\xc3\x81\xc0\x80",
+          {False: {None: None}, True:{None:{}}},
+          )
+
+def testUnsignedInt():
+    check(
+          b"\x99\xcc\x00\xcc\x80\xcc\xff\xcd\x00\x00\xcd\x80\x00"
+          b"\xcd\xff\xff\xce\x00\x00\x00\x00\xce\x80\x00\x00\x00"
+          b"\xce\xff\xff\xff\xff",
+          (0, 128, 255, 0, 32768, 65535, 0, 2147483648, 4294967295,),
+          )
+
+def testSignedInt():
+    check(b"\x99\xd0\x00\xd0\x80\xd0\xff\xd1\x00\x00\xd1\x80\x00"
+          b"\xd1\xff\xff\xd2\x00\x00\x00\x00\xd2\x80\x00\x00\x00"
+          b"\xd2\xff\xff\xff\xff",
+          (0, -128, -1, 0, -32768, -1, 0, -2147483648, -1,))
+
+def testRaw():
+    check(b"\x96\xda\x00\x00\xda\x00\x01a\xda\x00\x02ab\xdb\x00\x00"
+        b"\x00\x00\xdb\x00\x00\x00\x01a\xdb\x00\x00\x00\x02ab",
+        (b"", b"a", b"ab", b"", b"a", b"ab"))
+
+def testArray():
+    check(b"\x96\xdc\x00\x00\xdc\x00\x01\xc0\xdc\x00\x02\xc2\xc3\xdd\x00"
+        b"\x00\x00\x00\xdd\x00\x00\x00\x01\xc0\xdd\x00\x00\x00\x02"
+        b"\xc2\xc3",
+        ((), (None,), (False,True), (), (None,), (False,True))
+        )
+
+def testMap():
+    check(
+        b"\x96"
+            b"\xde\x00\x00"
+            b"\xde\x00\x01\xc0\xc2"
+            b"\xde\x00\x02\xc0\xc2\xc3\xc2"
+            b"\xdf\x00\x00\x00\x00"
+            b"\xdf\x00\x00\x00\x01\xc0\xc2"
+            b"\xdf\x00\x00\x00\x02\xc0\xc2\xc3\xc2",
+        ({}, {None: False}, {True: False, None: False}, {},
+            {None: False}, {True: False, None: False}))
+
+if __name__ == '__main__':
+    main()
diff --git a/python/test3/test_pack.py b/python/test3/test_pack.py
new file mode 100644
index 00000000..c861704b
--- /dev/null
+++ b/python/test3/test_pack.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python
+# coding: utf-8
+
+from nose import main
+from nose.tools import *
+
+from msgpack import packs, unpacks
+
+def check(data):
+    re = unpacks(packs(data))
+    assert_equal(re, data)
+
+def testPack():
+    test_data = [
+            0, 1, 127, 128, 255, 256, 65535, 65536,
+            -1, -32, -33, -128, -129, -32768, -32769,
+            1.0,
+        b"", b"a", b"a"*31, b"a"*32,
+        None, True, False,
+        (), ((),), ((), None,), 
+        {None: 0}, 
+        (1<<23), 
+        ]
+    for td in test_data:
+        check(td)
+
+if __name__ == '__main__':
+    main()
diff --git a/python/test3/test_sequnpack.py b/python/test3/test_sequnpack.py
new file mode 100644
index 00000000..5fd377c4
--- /dev/null
+++ b/python/test3/test_sequnpack.py
@@ -0,0 +1,36 @@
+#!/usr/bin/env python
+# coding: utf-8
+
+
+
+from msgpack import Unpacker
+
+def test_foobar():
+    unpacker = Unpacker(read_size=3)
+    unpacker.feed(b'foobar')
+    assert unpacker.unpack() == ord(b'f')
+    assert unpacker.unpack() == ord(b'o')
+    assert unpacker.unpack() == ord(b'o')
+    assert unpacker.unpack() == ord(b'b')
+    assert unpacker.unpack() == ord(b'a')
+    assert unpacker.unpack() == ord(b'r')
+    try:
+        o = unpacker.unpack()
+        print(("Oops!", o))
+        assert 0
+    except StopIteration:
+        assert 1
+    else:
+        assert 0
+    unpacker.feed(b'foo')
+    unpacker.feed(b'bar')
+
+    k = 0
+    for o, e in zip(unpacker, b'foobarbaz'):
+        assert o == e
+        k += 1
+    assert k == len(b'foobar')
+
+if __name__ == '__main__':
+    test_foobar()
+