[issue40738] backspace character \b not processed by IDLE

[Stan Hendryx]

Stan Hendryx  added the comment:

Hello Terry,

Thank you for your reply. I understand there are different interpretations of 
\b. IMHO, since IDLE is part of a python distribution, IDLE needs to be 
consistent with the native python interpreter on each platform. On Mac, IDLE 
gives
>>> print("deleted\b file")
deleted file

whereas on mac Terminal we get 
>>> print("deleted\b file")
delete file

JetBrains gives another vote for the native interpretation. I’ve been tutoring 
my grandson on python using JetBrains Academy’s python tutorials. 
They teach 
>>> print("deleted\b file")
delete file

That’s how I discovered the inconsistency.

Thank you,

Stan Hendryx

> On May 22, 2020, at 7:29 PM, Terry J. Reedy  wrote:
> 
> 
> Terry J. Reedy  added the comment:
> 
> I am considering terminal simulation as an option, but there is not exactly a 
> standard to emulate.  \b originally meant the same as the typewrite backspace 
> and modern US computer keyboard left arrow key <- (move cursor left without 
> erasing), which would result in 'delete filed' in insert mode, but sometimes 
> now is interpreted the same as modern US computer keyboard backspace (erase 
> and move left), as you expect.
> 
> --
> resolution:  -> duplicate
> stage:  -> resolved
> status: open -> closed
> superseder:  -> IDLE: Document how Shell displays user code output
> 
> ___
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> 
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[issue40738] backspace character \b not processed by IDLE

[Terry J. Reedy]

Terry J. Reedy  added the comment:

I am considering terminal simulation as an option, but there is not exactly a 
standard to emulate.  \b originally meant the same as the typewrite backspace 
and modern US computer keyboard left arrow key <- (move cursor left without 
erasing), which would result in 'delete filed' in insert mode, but sometimes 
now is interpreted the same as modern US computer keyboard backspace (erase and 
move left), as you expect.

--
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed
superseder:  -> IDLE: Document how Shell displays user code output

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[issue40738] backspace character \b not processed by IDLE

[Stan Hendryx]

New submission from Stan Hendryx :

The backspace character \b is not processed correctly in IDLE 3.8.2:
>>> print("deleted\b file")
deleted file

Running the interpreter from Terminal, it works:
>>> print("deleted\b file")
delete file

Same result on two systems: MacBook Pro, one on OSX 10.14.6 and another on 
10.13.6.

--
assignee: terry.reedy
components: IDLE
messages: 369685
nosy: stanhx, terry.reedy
priority: normal
severity: normal
status: open
title: backspace character \b not processed by IDLE
type: behavior
versions: Python 3.8

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