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I am skeptical that such a note will help. The iterator behavior is clearly pointed out in the Python Tutorial [1] and in the IOBase documentation [2]. I suspect this bad code pattern is just being copied and pasted from other sources without folks ever even looking at the Python documentation.
[1] http://docs.python.org/dev/tutorial/inputoutput.html?highlight=readlines#methods-of-file-objects
[2] http://docs.python.org/dev/library/io.html#io.IOBase