[issue36411] Python 3 f.tell() gets out of sync with file pointer in binary append+read mode

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan <tir.karthi at gmail.com>:


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nosy: +martin.panter, serhiy.storchaka

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36411>
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