[GRASS-git] [OSGeo/grass] 78edff: init: Fix SyntaxWarning: invalid escape sequence i...

[Dung Ho]

  Branch: refs/heads/main
  Home:   https://github.com/OSGeo/grass
  Commit: 78edffdc0d74224bff44c84cbd6ccf9b711cd61b
      https://github.com/OSGeo/grass/commit/78edffdc0d74224bff44c84cbd6ccf9b711cd61b
  Author: Dung Ho <htdung820 at gmail.com>
  Date:   2025-08-21 (Thu, 21 Aug 2025)

  Changed paths:
    M lib/init/grass.py

  Log Message:
  -----------
  init: Fix SyntaxWarning: invalid escape sequence in grass.py (#6239)

# Fix SyntaxWarning: invalid escape sequence in grass.py

## Problem
Python script generates SyntaxWarning and RuntimeError on Windows:

```
C:\opt\grass\build\output\bin\grass85.py:2095: SyntaxWarning: invalid escape sequence '\o'
  GRASS_PYDIR = os.path.normpath("C:\opt\grass\build\output\lib\grass85\etc\python")
Traceback (most recent call last):
  File "C:\opt\grass\build\output\bin\grass85.py", line 2473, in <module>
    main()
    ~~~~^^
  File "C:\opt\grass\build\output\bin\grass85.py", line 2118, in main
    find_grass_python_package()
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "C:\opt\grass\build\output\bin\grass85.py", line 2106, in find_grass_python_package
    raise RuntimeError(msg)
RuntimeError: The grass Python package is missing. Is the installation of GRASS complete?
```


## Solution
Convert string literal to raw string to properly handle backslashes in Windows paths.

## Changes
- Changed `"@GRASS_PYDIR@"` to `r"@GRASS_PYDIR@"` in the `find_grass_python_package()` function

This eliminates the SyntaxWarning about invalid escape sequence `\o` and ensures proper path handling on Windows systems.

Fixes Python syntax warning that occurs during GRASS GIS initialization on Windows.



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