Windson Yang <wiwind...@outlook.com> added the comment:
I'm not sure it's a bug. When you write binary data to file (use BufferedIOBase by default). It actually writes the data to a buffer. That is why tell() gets out of sync. You can follow the instrument belolw. For instance, call flush() after writing to get the `correct answer.` > When writing to this object, data is normally placed into an internal buffer. > The buffer will be written out to the underlying RawIOBase object under > various conditions, including: > when the buffer gets too small for all pending data; > when flush() is called; > when a seek() is requested (for BufferedRandom objects); > when the BufferedWriter object is closed or destroyed. 1. https://docs.python.org/3/library/io.html#io.BufferedWriter ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue36411> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
