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Re: unable to resolve readline issues

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From: eryksun@gmail.com (Eryk Sun)
Newsgroups: comp.lang.python
Subject: Re: unable to resolve readline issues
Date: Sun, 4 Dec 2022 14:08:36 -0600
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by: Eryk Sun - Sun, 4 Dec 2022 20:08 UTC

On 12/2/22, biglee12672@gmail.com <biglee12672@gmail.com> wrote:
>
> From this point on Python became unusable as I uninstalled rebooted then
> reinstalled to find I have the same issues as stated. Finally uninstalled
> Python as it doesn't perform as usual especially trying to understand the
> use of pyreadline, gnureadline and or just readline.

When Python runs interactively, it implicitly tries to import the
readline module. On POSIX, Python has a builtin readline module that
usually uses the GNU Readline library.

On Windows, Python does not include a readline module. Instead, if
standard I/O is a console, the high-level WinAPI ReadConsoleW()
function is used, which implements its own line editor and
command-line history. It's not as general, flexible, or capable as the
readline interface, so a third-party pyreadline package was
implemented for Windows. However, as far as I know, pyreadline is no
longer actively developed. Thus it has out-of-date code, which may be
broken in newer releases of Python, such as isinstance(x,
collections.Callable).

Your choice is to either patch pyreadline to fix the bug or uninstall it.

Re: unable to resolve readline issues

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From: salmodovar@ligumu.com (Sabrina Almodóvar)
Newsgroups: comp.lang.python
Subject: Re: unable to resolve readline issues
Date: Sun, 4 Dec 2022 20:36:19 -0300
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by: Sabrina Almodóvar - Sun, 4 Dec 2022 23:36 UTC

On 04/12/2022 17:08, Eryk Sun wrote:
> On 12/2/22, biglee12672@gmail.com <biglee12672@gmail.com> wrote:
>>
>> From this point on Python became unusable as I uninstalled rebooted then
>> reinstalled to find I have the same issues as stated. Finally uninstalled
>> Python as it doesn't perform as usual especially trying to understand the
>> use of pyreadline, gnureadline and or just readline.
>
> When Python runs interactively, it implicitly tries to import the
> readline module. On POSIX, Python has a builtin readline module that
> usually uses the GNU Readline library.
>
> On Windows, Python does not include a readline module. Instead, if
> standard I/O is a console, the high-level WinAPI ReadConsoleW()
> function is used, which implements its own line editor and
> command-line history. It's not as general, flexible, or capable as the
> readline interface, so a third-party pyreadline package was
> implemented for Windows. However, as far as I know, pyreadline is no
> longer actively developed. Thus it has out-of-date code, which may be
> broken in newer releases of Python, such as isinstance(x,
> collections.Callable).
>
> Your choice is to either patch pyreadline to fix the bug or uninstall it.

(*) How to patch it

Open the file

Lib/site-packages/pyreadline/py3k_compat.py

and locate the procedure

def callable(x):
return isinstance(x, collections.Callable)

Change it to

def callable(x):
return isinstance(x, collections.abc.Callable)

You're done.

Let's call it an accidental feature. -- Larry Wall

devel / comp.lang.python / Re: unable to resolve readline issues

devel / comp.lang.python / Re: unable to resolve readline issues

Subject	Author
Re: unable to resolve readline issues	Eryk Sun
Re: unable to resolve readline issues	Sabrina Almodóvar