[Python] Python function strange behavior with arguments [duplicate]

Possible Duplicate:
“Least Astonishment” in Python: The Mutable Default Argument
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In the following code, should the output not be 6 6 7 6? But the actual output is very different, as mentioned below:

i = 5

def fs(args=i):
print args
print i

i = 6
fs()
fs(7)


The actual output is:

5 6 7 6

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