[issue26158] File truncate() not defaulting to current position as documented

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

This is not always possible. Consider following example:

>>> open('temp.txt', 'wb').write(b'+BDAEMQQyBDMENA-')
16
>>> f = open('temp.txt', 'r+', encoding='utf-7')
>>> f.read(2)
'аб'

What should be the result of truncating?

I think it would be better to not implement truncate() for text files at all.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26158>
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