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Fri Sep 2 23:10:18 EDT 2005 · http://mail.python.org/pipermail/python-list/2005-September/316703.html

I think you still have to roll your own.

Here's a start:
	def ireadlines(f, s='\n', bs=4096):
	    if not s: raise ValueError, "separator must not be empty"
	    r = []
	    while 1:
		b = f.read(bs)
		if not b: break
		ofs = 0
		while 1:
		    next = b.find(s, ofs)
		    if next == -1: break
		    next += len(s)
		    yield ''.join(r) + b[ofs:next]
		    del r[:]
		    ofs = next
		r.append(b[ofs:])
	    yield ''.join(r)

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Record separator for readlines()