On Sat, 11 Feb 2023 at 07:36, Python <pyt...@bladeshadow.org> wrote:
> If it's the case that you simply want to know the length of the string
> that will be printed, you can, rather than expecting the I/O function
> to tell that to you, figure it out for yourself ahead of time, e.g.
> instead of:
>
> username = "John Smith"
> job = "Python programmer"
>
> # this doesn't work as desired
> len = print(f"{username} has occupation {job}.")
> print(len)
> ...
>
> You would do this instead:
>
> message = f"{username} has the occupation {job}."
> message_length = len(message)
> print(message)
> print(message_length)
> ...
>
It's worth noting WHY output functions often return a byte count. It's
primarily for use with nonblocking I/O, with something like this:
buffer = b".............."
buffer = buffer[os.write(fd, buffer):]
It's extremely important to be able to do this sort of thing, but not
with the print function, which has a quite different job.
ChrisA
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