文件对象本身已经是可迭代的。
>>> f = open('1.txt')
>>> f
<_io.TextIOWrapper name='1.txt' encoding='UTF-8'>
>>> next(f)
'1,B,-0.0522642316338,0.997268450092\n'
>>> next(f)
'2,B,-0.081127897359,2.05114559572\n'
用于itertools.islice从可迭代对象中获取任意元素。
>>> f.seek(0)
0
>>> next(islice(f, 7, None))
'8,A,-0.0518101108474,12.094341554\n'
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