New submission from PEW's Corner <pewscor...@gmail.com>:
When a file is opened in binary append+read mode, i.e. open('file', 'a+b'), and
a write (i.e. append) operation is performed while the file pointer is not at
the end of the file (e.g. after a seek(0)), tell() will subsequently return the
wrong value in Python 3 (but not in Python 2).
See this SO question:
https://stackoverflow.com/questions/51010322/python-3-tell-gets-out-of-sync-with-file-pointer-in-appendread-mode
----------
components: IO
messages: 338709
nosy: pewscorner
priority: normal
severity: normal
status: open
title: Python 3 f.tell() gets out of sync with file pointer in binary
append+read mode
type: behavior
versions: Python 3.6, Python 3.7
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36411>
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