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Comment by anewaccountname | Hacker News Reader

Give me one example where you would ever want a copy of a tuple rather than another reference to it.

That wasn't my point. My point was that [:] conserves the type of sequence.

Also [:] returns a reference to the existing tuple instead of a copy:

    >>> a = (1, 2, 3)

    >>> id(a)
    3081276268L

    >>> id(a[:])
    3081276268L