[Tutor] Interactive editing of variables.

[mhysnm1964 at gmail.com]

As I thought. Easygui is not accessible at all with a screen reader due to
the underlying graphic library. Win32 could work if I could load it. Since
then I could use standard windows objects.

Note, I didn't see anything in the quick scan I did ion the API. 


Very frustrating and disappointing. 
-----Original Message-----
From: Tutor <tutor-bounces+mhysnm1964=gmail.com at python.org> On Behalf Of
Alan Gauld via Tutor
Sent: Saturday, 1 June 2019 4:50 PM
To: tutor at python.org
Subject: Re: [Tutor] Interactive editing of variables.

On 01/06/2019 03:53, mhysnm1964 at gmail.com wrote:

> I have no clue on how to achieve what I want to do and the code I have 
> creates an hash. As shown below:

Thats because what you want is not a standard feature of CLI apps.
You will need to do one of the following(in order of easiness):
1) Use a GUI - it then becomes a trivial matter
2) Use a pseudo GUI like curses to provide cursor control
3) Find a module that already does what you need
   (maybe readline can be made to work?)
4) Write a function yourself using screen primitives
   that manage the cursor


> for row in description:
>     text = description_rejex(row)
>     if text[0] not in narration: 
>         Result = input(text[0])
>         narration[result] = text

The standard tools allow you to input a new value and overwrite the existing
one. But there is no simple way to interactively modify an existing value
(and of course you would need to convert it to/from a string for that to be
possible)

> I have had a look and cannot find an example where I can interactively 
> edit a content of a variable at the command line. I do not want to use 
> GUI at all.

A GUI makes this a trivial problem. Simply display an edit control and
insert the current value as a string. Allow the user to modify it and when
done read the new value back. If you don't want to use a GUI you need to
provide GUI like controls yourself, either through an existing module or by
writing one. Something like easygui would be eminently suitable. But even
vanilla Tkinter is almost trivial.

The curses library will do it but that is not standard on Windows and I've
heard varying reports of how well it works there.

The readline library allows basic editing of the commands line but I'm not
sure how you would insert your variable into the command line initially...

For windows there are a couple of modules available that provide low level
cursor control and character input/output, so you could use one of those to
write such a function.

And if you search hard enough you should find that somebody, somewhere has
already done the work for you. But I don't know where...

--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.amazon.com/author/alan_gauld
Follow my photo-blog on Flickr at:
http://www.flickr.com/photos/alangauldphotos


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