TypeError: expected a character buffer object – while trying to save integer to textfile

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Have you checked the docstring of write()? It says:

write(str) -> None. Write string str to file.

Note that due to buffering, flush() or close() may be needed before
the file on disk reflects the data written.

So you need to convert y to str first.

Also note that the string will be written at the current position which will be at the end of the file, because you’ll already have read the old value. Use f.seek(0) to get to the beginning of the file.`

Edit: As for the IOError, this issue seems related. A cite from there:

For the modes where both read and writing (or appending) are allowed
(those which include a “+” sign), the stream should be flushed (fflush)
or repositioned (fseek, fsetpos, rewind) between either a reading
operation followed by a writing operation or a writing operation
followed by a reading operation.

So, I suggest you try f.seek(0) and maybe the problem goes away.

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