Silly question re: 'for i in sys.stdin'?

[Jeff Epler]

The iterator for files is a little bit like this generator function:
    def lines(f):
        while 1:
            chunk = f.readlines(sizehint)
            for line in chunk: yield line
Inside file.readlines, the read from the tty will block until sizehint
bytes have been read or EOF is seen.

If you want this kind of line-at-a-time functionality, then you could
use the iter(callable, sentinel) form, and switch between it and the
readlines method based on a commandline flag or whether the file
satisfies 'os.isatty()':
    def lines(f):  # untested
        """lines(f)
If f is a terminal, then return an iterator that gives a value after
each line is entered.  Otherwise, return the efficient iterator for
files."""
        if hasattr(f, "fileno") and isatty(f.fileno()):
            return iter(f.readline, '')
        return iter(f)

    for line in lines(sys.stdin):
        doSomethingWith(line)

Jeff
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