#format python
import unittest

class SeqDict(dict):
    """dictionary that perserve the setted sequence
    """
    def __init__(self):
        self._seq=list()
    def __setitem__(self, key, value):
        self._seq.append(key)
        dict.__setitem__(self, key, value)
    def keys(self):
        return self._seq
    def values(self):
        result=list()
        for key in self.keys():
            result.append(self[key])
        return result

class SeqDictTest(unittest.TestCase):
    def test1(self):
        sd = SeqDict()
        sd['one'] = 1
        sd['two'] = 2
        sd['three'] = 3
        self.assertEquals(['one','two','three'], sd.keys())
        self.assertEquals([1,2,3], sd.values())

class ValueSizedSeqDict(SeqDict):
    """To be continue..."""

if __name__=='__main__':
    unittest.main(argv=('','-v'))