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bug#71440: Python Inferior Mode Can’t Recognize My Prompt
From: |
kobarity |
Subject: |
bug#71440: Python Inferior Mode Can’t Recognize My Prompt |
Date: |
Wed, 12 Jun 2024 22:09:45 +0900 |
User-agent: |
Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (Gojō) APEL-LB/10.8 EasyPG/1.0.0 Emacs/30.0.50 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) |
Eli Zaretskii wrote:
>
> > Date: Wed, 12 Jun 2024 01:24:39 +0900
> > From: kobarity <kobarity@gmail.com>
> > Cc: 71440@debbugs.gnu.org
> >
> >
> > > Eli Zaretskii wrote:
> > > > > > I wonder how PS1 and PS2 are at all relevant when using
> > > > > > python-shell-send-buffer? That function sends the buffer
> > > > > > text to Python, so where do PS1 and PS2 come into play,
> > > > > > and why does Python say "__PYTHON_EL_eval is not defined"
> > > > > > just because you have PS1 and PS2 customized?
> >
> > PS1 and PS2 are set to `comint-prompt-regexp', and used to identify
> > execution completion. The prompts must also be identified to
> > determine if the command can be sent.
> >
> > Python REPL cannot accept the Python code as is. For example, try
> > pasting the following code to the REPL:
> >
> > if True:
> > print("True")
> > print("Hi")
> >
> > You should see the message "SyntaxError: invalid syntax". This is
> > because the REPL requires an empty line to recognize the completion of
> > a block. For such reasons, `python-shell-send-*' sends a string as
> > the argument to __PYTHON_EL_eval instead of sending the code as is.
> >
> > __PYTHON_EL_eval is defined during the initialization of inferior
> > Python, but if the prompt is not recognized, its definition cannot be
> > done either.
> >
> > The prompts are recognized by `python-shell-prompt-detect'. A small
> > Python code sends PS1, etc. to Emacs as an array of JSON strings.
> > However, the JSON strings are hand-crafted for compatibility, as noted
> > in the comments below.
> >
> > ;; JSON is built manually for compatibility
> >
> > The json package was added in Python 2.6, so I assume it is to support
> > Python 2.5 and earlier. This is fine for prompts consisting only of
> > ordinary characters, but will not result in a correct JSON string if
> > it contains escape sequences.
> >
> > The attached improved patch uses the json package if available, so it
> > can handle escape sequences; without the json package, it works as
> > before. It means that prompts containing escape sequences can be
> > recognized in Python 2.6 or later. I have also added an ERT to check
> > this.
>
> Thanks, but what do you mean by "json package" here? Emacs nowadays
> has JSON capabilities built in, so no optional features should be
> required. I did I misunderstand what you say above?
I meant the json package of the Python standard library. A small
Python code is embedded in python.el. I changed this Python code to
use the json package of the Python standard library if available.
It may be easier to see the actual code:
(let* ((code (concat
"import sys\n"
"ps = [getattr(sys, 'ps%s' % i, '') for i in range(1,4)]\n"
"try:\n"
" import json\n"
" ps_json = '\\n' + json.dumps(ps)\n"
"except ImportError:\n"
;; JSON is built manually for compatibility
" ps_json = '\\n[\"%s\", \"%s\", \"%s\"]\\n' %
tuple(ps)\n"
"\n"
"print (ps_json)\n"
"sys.exit(0)\n"))
- bug#71440: Re: Re: bug#71440: Python Inferior Mode Can’t Recognize My Prompt, (continued)
- bug#71440: Re: Re: bug#71440: Python Inferior Mode Can’t Recognize My Prompt, shynur ., 2024/06/08
- bug#71440: Re: Re: Re: bug#71440: Python Inferior Mode Can’t Recognize My Prompt, Eli Zaretskii, 2024/06/09
- bug#71440: Python Inferior Mode Can’t Recognize My Prompt, shynur ., 2024/06/09
- bug#71440: Re: bug#71440: Python Inferior Mode Can’t Recognize My Prompt, Eli Zaretskii, 2024/06/09
- bug#71440: Python Inferior Mode Can’t Recognize My Prompt, shynur ., 2024/06/09
- bug#71440: Re: bug#71440: Python Inferior Mode Can’t Recognize My Prompt, Eli Zaretskii, 2024/06/09
- bug#71440: Python Inferior Mode Can’t Recognize My Prompt, kobarity, 2024/06/09
- bug#71440: Python Inferior Mode Canʼt Recognize My Prompt, shynur ., 2024/06/09
- bug#71440: Python Inferior Mode Can’t Recognize My Prompt, kobarity, 2024/06/11
- bug#71440: Python Inferior Mode Can’t Recognize My Prompt, Eli Zaretskii, 2024/06/12
- bug#71440: Python Inferior Mode Can’t Recognize My Prompt,
kobarity <=
- bug#71440: Python Inferior Mode Can’t Recognize My Prompt, shynur ., 2024/06/12
- bug#71440: Python Inferior Mode Can’t Recognize My Prompt, kobarity, 2024/06/13
- bug#71440: Python Inferior Mode Can’t Recognize My Prompt, Eli Zaretskii, 2024/06/15