Remembered arguments to a function

[wruuqr ewfjbc]

Should I have expected the behavior of this function? 
Is this a bug?  Is it wise to exploit this behavior?

def test(a, b, d={}):
	'''
	sample output:

	Python 2.1.3 (#35, Apr  8 2002, 17:47:50) [MSC 32 bit
(Intel)] on win32
	Type "copyright", "credits" or "license" for more
information.
	>>> x = test(1, 2)
	>>> x
	{1: 2}
	>>> x = test(3, 4)
	>>> x
	{3: 4, 1: 2}
	>>> y = test(5, 6)
	>>> y
	{5: 6, 3: 4, 1: 2}
	>>> test(7, 8)
	{7: 8, 5: 6, 3: 4, 1: 2}
	'''
	d[a] = b
	return d

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