file closing

[Skip Montanaro]

    [second case]
    >> file('test.dat','w').write(chr(0)*1000000)

    >> where the second one relies on garbage collection?

    Laotseu> Yes, AFAIK.

More precisely, it relies on reference counting.  There's no cycle which
needs to be broken, so CPython's cyclical garbage collection isn't involved.

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