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comp / comp.lang.python / Re: IDLE: clearing the screen

SubjectAuthor
* Re: IDLE: clearing the screenRob Cliffe
`* Re: IDLE: clearing the screenMichael F. Stemper
 `* Re: IDLE: clearing the screenStefan Ram
  `- Re: IDLE: clearing the screenMichael F. Stemper

1
Subject: Re: IDLE: clearing the screen
From: Rob Cliffe
Newsgroups: comp.lang.python
Date: Sat, 8 Jun 2024 19:18 UTC
References: 1
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From: rob.cliffe@btinternet.com (Rob Cliffe)
Newsgroups: comp.lang.python
Subject: Re: IDLE: clearing the screen
Date: Sat, 8 Jun 2024 20:18:16 +0100
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OK, here is the advanced version:
import os
class _cls(object):
    def __repr__(self):
        os.system('cls')
        return ''
cls = _cls()

Now when you type
cls
it clears the screen.  The only flaw is that there is a blank line at
the very top of the screen, and the ">>>" prompt appears on the SECOND
line.
(This blank line is because the IDLE prints the blank value returned by
"return ''" and adds a newline to it, as it does when printing the value
of any expression.)

Best wishes
Rob Cliffe

Subject: Re: IDLE: clearing the screen
From: Michael F. Stemper
Newsgroups: comp.lang.python
Organization: A noiseless patient Spider
Date: Mon, 10 Jun 2024 13:55 UTC
References: 1 2
Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: michael.stemper@gmail.com (Michael F. Stemper)
Newsgroups: comp.lang.python
Subject: Re: IDLE: clearing the screen
Date: Mon, 10 Jun 2024 08:55:20 -0500
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On 08/06/2024 14.18, Rob Cliffe wrote:
> OK, here is the advanced version:
> import os
> class _cls(object):
>     def __repr__(self):
>         os.system('cls')
>         return ''
> cls = _cls()
>
> Now when you type
> cls
> it clears the screen.  The only flaw is that there is a blank line at the very top of the screen, and the ">>>" prompt appears on the SECOND line.
> (This blank line is because the IDLE prints the blank value returned by "return ''" and adds a newline to it, as it does when printing the value of any expression.)

Why have it return anything at all?

--
Michael F. Stemper
Indians scattered on dawn's highway bleeding;
Ghosts crowd the young child's fragile eggshell mind.

Subject: Re: IDLE: clearing the screen
From: Stefan Ram
Newsgroups: comp.lang.python
Organization: Stefan Ram
Date: Mon, 10 Jun 2024 14:32 UTC
References: 1 2
Path: eternal-september.org!news.eternal-september.org!feeder3.eternal-september.org!fu-berlin.de!uni-berlin.de!not-for-mail
From: ram@zedat.fu-berlin.de (Stefan Ram)
Newsgroups: comp.lang.python
Subject: Re: IDLE: clearing the screen
Date: 10 Jun 2024 14:32:41 GMT
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"Michael F. Stemper" <michael.stemper@gmail.com> wrote or quoted:
>On 08/06/2024 14.18, Rob Cliffe wrote:
>> OK, here is the advanced version:
>> import os
>> class _cls(object):
>>     def __repr__(self):
>>         os.system('cls')
>>         return ''
>> cls = _cls()
....
>Why have it return anything at all?

Because __repr__ needs to return a str.

Subject: Re: IDLE: clearing the screen
From: Michael F. Stemper
Newsgroups: comp.lang.python
Organization: A noiseless patient Spider
Date: Mon, 10 Jun 2024 15:49 UTC
References: 1 2 3 4
Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: michael.stemper@gmail.com (Michael F. Stemper)
Newsgroups: comp.lang.python
Subject: Re: IDLE: clearing the screen
Date: Mon, 10 Jun 2024 10:49:42 -0500
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On 10/06/2024 09.32, Stefan Ram wrote:
> "Michael F. Stemper" <michael.stemper@gmail.com> wrote or quoted:
>> On 08/06/2024 14.18, Rob Cliffe wrote:
>>> OK, here is the advanced version:
>>> import os
>>> class _cls(object):
>>>     def __repr__(self):
>>>         os.system('cls')
>>>         return ''
>>> cls = _cls()
> ...
>> Why have it return anything at all?
>
> Because __repr__ needs to return a str.

Got it. Thanks for clarifying.

--
Michael F. Stemper
87.3% of all statistics are made up by the person giving them.

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