Customizable venv prompt prefix and suffix

Feature or enhancement

Proposal:

In venv activate PS1 is updated with the fixed format.

Some user like me doesn't like such format for some reason.

For my case, I'd like to keep empty line between the previous output and the current prompt like

[/tmp]                                                                                                                                                                                                                                                                                                                                                                                                                                  
<username>@<hostname>% python --version
Python 3.14.2

[/tmp]                                                                                                                                                                                                                                                                                                                                                                                                                                  
<username>@<hostname>% 

If I enable venv, it breaks my preference like

(.python.venv.default.3.14.2) 
[/tmp]                                                                                                                                                                                                                                                                                                                                                                                                                                  
<username>@<hostname>% python --version
Python 3.14.2
(.python.venv.default.3.14.2) 
[/tmp]                                                                                                                                                                                                                                                                                                                                                                                                                                  
<username>@<hostname>% 

I want to keep empty like between previous output and commands like

(.python.venv.default.3.14.2) 
[/tmp]                                                                                                                                                                                                                                                                                                                                                                                                                                  
<username>@<hostname>% python --version
Python 3.14.2

(.python.venv.default.3.14.2) 
[/tmp]                                                                                                                                                                                                                                                                                                                                                                                                                                  
<username>@<hostname>% 

This can be easily achieved keeping the compatibility by taking prefix and suffix for venv name in activate to set PS1 instaed of current "(" and ") ".

It makes someone to use explain venv name as their preferred way like

(Python env: /home/<...>/.venv)
[/tmp]                                                                                                                                                                                                                                                                                                                                                                                                                                  
<username>@<hostname>% python --version
Python 3.14.2

(Python env: /home/<...>/.venv) 
[/tmp]                                                                                                                                                                                                                                                                                                                                                                                                                                  
<username>@<hostname>% 

with

# Auto activate .venv in the new dir
function chpwd() {
    if [[ -d "`pwd`/.venv" ]]; then
        VIRTUAL_ENV_PROMPT_PREFIX="
(Python env: `pwd`/" source `pwd`/.venv/bin/activate
    fi
}

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

Linked PRs

• gh-144205

從提案中引用的 venv 啟用腳本開始，檢查它目前如何設定 PS1。將所要求的可設定前綴和後綴行為與 gh-144205 中連結的工作進行比較；完成標準是在保留現有預設行為的同時，允許使用範例中所示的提示字元格式。