*scratch*.el

In [23]: from pyethereum import trie

In [24]: t=trie.Trie("foo2")

In [25]: t.__dict__
Out[25]: {'db': <pyethereum.trie.DB at 0x128a950>, 'debug': False, 'root': ''}

In [26]: t.update("foo", "bar")

In [27]: t.__dict__
Out[27]: 
{'db': <pyethereum.trie.DB at 0x128a950>,
 'debug': False,
 'root': [' foo', 'bar']}

In [28]: t.update("foob", "bar")

In [29]: t.__dict__
Out[29]: 
{'db': <pyethereum.trie.DB at 0x128a950>,
 'debug': False,
 'root': '\xd0K<\xe8\xa1\x0eWD\x91\x15\xfe\xfa8\x93a,\xeb\xbf\xe4\xc9@\xb1\xdc\x02M\xfa\xc3\x188\xcd~\x7f'}