您可以使用生成器：
def myreadlines(f, newline): buf = "" while True: while newline in buf: pos = buf.index(newline) yield buf[:pos] buf = buf[pos + len(newline):] chunk = f.read(4096) if not chunk: yield buf break buf += chunkwith open('file') as f: for line in myreadlines(f, "."): print line
