Serhiy Storchaka added the comment:
This is because the file is buffered.
>>> open('temp.txt', 'w').write('ABCDE\nFGHIJ\nKLMNO\nPQRST\nUVWXY\nZ\n')
32
>>> f = open('temp.txt', 'r+')
>>> f.readline()
'ABCDE\n'
>>> f.tell()
6
>>> f.buffer.tell()
32
>>> f.buffer.raw.tell()
32
The documentation needs a clarification.
----------
assignee: -> docs@python
components: +Documentation
nosy: +benjamin.peterson, docs@python, haypo, pitrou, serhiy.storchaka,
steve.dower, stutzbach
versions: +Python 2.7, Python 3.6 -Python 3.4
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26158>
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