[Chicago] is there really no built-in file/iter split() thing?

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    Ian> One thing I've noticed is that some string operations are fairly
    Ian> efficient in this case, because they notice when they wouldn't do
    Ian> anything and don't create a new string.

    ...

    >>> x.split()[0] is x
    False

Patch here:

    http://bugs.python.org/issue1538

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