Terry J. Reedy added the comment:
I like the idea, but doubt this can be implemented. Python assumes a
least-common-denominator dumb terminal. Program output is sent on stdout/err
and displayed read-only. Used input is read from stdin. It is put there
either key by key or after the Enter
New submission from Steven D'Aprano :
When asking for user input, it is often very helpful to be able to pre-populate
the user's input string and allow them to edit it, rather than expecting them
to re-type the input from scratch.
I propose that the input() built-in take a second optional arg
