Martin Panter <vadmium...@gmail.com> added the comment: This is the same as Issue 26158. Truncating text files is not clearly documented for a start, and truncating after reading doesn’t seem to be considered much in the implementations.
Your question is answered at <https://bugs.python.org/issue26158#msg258619>. Your code calls the C implementation of “io.TextIOWrapper.truncate”. This implementation does not consider that there are 8 unread bytes in a buffer, so it truncates the file at the end of the buffer (5 read + 8 unread = 13 bytes). ---------- nosy: +martin.panter resolution: -> duplicate stage: -> resolved status: open -> closed superseder: -> File truncate() not defaulting to current position as documented _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue35304> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
