What substitutes xreadlines() in Python 3?

iterator, python, python-3.x, readlines

Solution

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'

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'

Problem

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 exists, and realines() still returns a list (not an iterator). Does Python 3 has something similar to xreadlines()? I know I can do ``` for line in f: ``` instead of ``` for line in f.xreadlines(): ``` But I would also like to use xreadlines() without a for loop: ``` print(f.xreadlines()[7]) #read lines 0 to 7 and prints line 7 ```

Original source