What substitutes xreadlines() in Python 3?

Question

In Python 2, file objects had an xreadlines() method which returned an iterator that would read the file one line at a time. In Python 3, the xreadlines() method no longer e

Answer 1

The file object itself is already an iterable.

>>> 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'

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Use itertools.islice to get an arbitrary element from an iterable.

>>> f.seek(0)
0
>>> next(islice(f, 7, None))
'8,A,-0.0518101108474,12.094341554\n'