Don't understand behavior; instance form a class in another class' instance

[Martin P. Hellwig]

Hi all,

When I run the following snippet (drastically simplified, to just show 
what I mean):
>>
import platform, sys
class One(object):
    def __init__(self):
        self.one = True

    def change(self):
        self.one = False

class Two(object):
    def __init__(self):
        self._instance_one = One()
        self.one = self._instance_one.one
        self.change = self._instance_one.change

if __name__ == '__main__':
    print(sys.version)
    print(platform.machine())
    print(80*'#')
    TEST1 = One()
    print(TEST1.one)
    TEST1.change()
    print(TEST1.one)
    TEST1 = None
    print(80*'#')
    TEST2 = Two()
    print(TEST2.one)
    TEST2.change()
    print(TEST2.one
>>

I get the following result:

<<
[GCC 4.2.1 20070719  [FreeBSD]]
amd64
################################################################################
True
False
################################################################################
True
True
################################################################################
<<

What I don't understand why in the second test, the last boolean is True 
instead of (what I expect) False.
Could somebody enlighten me please as this has bitten me before and I am 
confused by this behavior.

Thanks in advance

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