On 16Jan2022 20:57, MRAB <pyt...@mrabarnett.plus.com> wrote: >There was a discussion on another forum that mentioned the 'input' >function, and it made me wonder whether 'input' should be printing the >prompt to stderr instead of stdout. > >The convention is for normal output to go to stdout and error messages >to go to stderr, so if a program needs to ask the user, shouldn't it be >using stderr for prompts in order not to mess up the normal output?
This is a good reason to avoid sending prompts to stdout. But stderr isn't necessarily right either. If stderr's attached to a tty (UNIX, different techiness for Windows) you could reasonably send to stderr, otherwise you might be better opening /dev/tty (if you're allowed to, and if you have one). Etc etc. There was a long thread in the "Core Development" forum just the other day about this, here: https://discuss.python.org/t/builtin-function-input-writes-its-prompt-to-sys-stderr-and-not-to-sys-stdout/12955 Have a read. Cheers, Cameron Simpson <c...@cskk.id.au> _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/NNK7KBEAOIHKHZVXLMDRAHQOIYYP6FSC/ Code of Conduct: http://python.org/psf/codeofconduct/
