On 10/25/2016 7:45 PM, BartC wrote:
On 25/10/2016 23:58, Chris Angelico wrote:
Yes, it does. Text does not include "Home" or "Delete", but it does
include all manner of symbols that aren't on everyone's keyboards. It
makes a huge difference.
Actually TXT files can include codes such as Carriage Return, Backspace
and Tab.
These are called 'control *characters*' because, like characters, they
are represented as encoded bytes or, now, as unicode codepoints. 'Home'
is not a control character. (I don't know if there is a unicode
codepoint for it.)
Of course, you might want to stick your head in the sand and pretend
that every character has a button on your keyboard.
I'm not sure of the relevance of that. There isn't a 1:1 correspondence
between key and character code. So 'a' and 'A' might both be entered by
pressing the key marked 'A'. With, possibly, some underlying translation
so that the 'A' key can vary locations by locale. That isn't new.
The translation used to be done by a physically separate terminal and
communication between computer and and terminal was via encoded bytes.
A program could not access keystrokes because the computer never saw
them. Python normally runs in a terminal or console that translates
keycodes to encoded bytes
It doesn't seem to me that anyone is denying that key-at-a-time access
is useful in a wide range of programs. They just seem to be unwilling to
let it be it available in a simple, standard form.
The simple, standard form for Python, as well as for tcl, perl, and
ruby, is as tk events. Python accesses then via tkinter. Other
languages have their own version of the API.
> We are expected to download wxPython first.
Since this is not true, why do you keep repeating it?
--
Terry Jan Reedy
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