[Tutor] Help with dictionary

[Gordon W. Ayers]

PythonWin 2.2 (#28, Dec 21 2001, 12:21:22) [MSC 32 bit (Intel)] on
win32.
Portions Copyright 1994-2001 Mark Hammond (mhammond@skippinet.com.au) -
see 'Help/About PythonWin' for further copyright information.
>>> a =
{"server":"mpilgrim","database":"master","uid":"sa","pwd":"secret"}
>>> a
{'pwd': 'secret', 'database': 'master', 'uid': 'sa', 'server':
'mpilgrim'}
>>>

In the above session, why is the dictionary contents reversed when I
redisplay
the dictionary?
TIA
                                            Gord