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

从提案中引用的 venv 激活脚本开始，检查它目前如何设置 PS1。将所请求的可配置前缀和后缀行为与 gh-144205 中链接的工作进行比较；完成标准是在保留现有默认行为的同时，允许使用示例中所示的提示符格式。