error rendering to pdf when including Python error message with containing \ as e.g. np.testing.assert_equal

[kandolfp]

Bug description

Important

In short the problem is that some Python error messages contain \ (backslash) that needs to be translated to \textbackslash{} for LaTeX output

Note

Follow up to #10891.

When rendering the following code chunk with #| error: true and the Python code that uses the numpy.testing.assert_equal.

The problem is with the error message itself

---------------------------------------------------------------------------
AssertionError                            Traceback (most recent call last)
Cell In[2], line 6
      4 A = np.random.rand(3, 3)
      5 X = LA.inv(A)
----> 6 np.testing.assert_equal(A @ X, np.eye(A.shape[0]))

    [... skipping hidden 1 frame]

File .venv/lib/python3.12/site-packages/numpy/_utils/__init__.py:85, in _rename_parameter.<locals>.decorator.<locals>.wrapper(*args, **kwargs)
     83             raise TypeError(msg)
     84         kwargs[new_name] = kwargs.pop(old_name)
---> 85 return fun(*args, **kwargs)

    [... skipping hidden 1 frame]

File .venv/lib/python3.12/site-packages/numpy/testing/_private/utils.py:884, in assert_array_compare(comparison, x, y, err_msg, verbose, header, precision, equal_nan, equal_inf, strict, names)
    879         err_msg += '\n' + '\n'.join(remarks)
    880         msg = build_err_msg([ox, oy], err_msg,
    881                             verbose=verbose, header=header,
    882                             names=names,
    883                             precision=precision)
--> 884         raise AssertionError(msg)
    885 except ValueError:
    886     import traceback

AssertionError: 
Arrays are not equal

Mismatched elements: 7 / 9 (77.8%)
Max absolute difference among violations: 1.21927e-16
Max relative difference among violations: 1.11022302e-16
 ACTUAL: array([[ 1.000000e+00,  4.295956e-18,  1.526214e-17],
       [ 1.433446e-17,  1.000000e+00, -1.007895e-16],
       [ 4.090201e-17, -1.219270e-16,  1.000000e+00]])
 DESIRED: array([[1., 0., 0.],
       [0., 1., 0.],
       [0., 0., 1.]])

that contains two \n in the line 879 err_msg += '\n' + '\n'.join(remarks).
This gets translated to

\textcolor{QuartoInternalColor2}{}\textcolor{QuartoInternalColor4}{    884}\textcolor{QuartoInternalColor2}{         err_msg }\textcolor{QuartoInternalColor8}{+}\textcolor{QuartoInternalColor2}{}\textcolor{QuartoInternalColor8}{=}\textcolor{QuartoInternalColor2}{ }\textcolor{QuartoInternalColor6}{'}\textcolor{QuartoInternalColor2}{}\textcolor{QuartoInternalColor16}{\n}\textcolor{QuartoInternalColor2}{}\textcolor{QuartoInternalColor6}{'}\textcolor{QuartoInternalColor2}{ }\textcolor{QuartoInternalColor8}{+}\textcolor{QuartoInternalColor2}{ }\textcolor{QuartoInternalColor6}{'}\textcolor{QuartoInternalColor2}{}\textcolor{QuartoInternalColor16}{\n}\textcolor{QuartoInternalColor2}{}\textcolor{QuartoInternalColor6}{'}\textcolor{QuartoInternalColor2}{}\textcolor{QuartoInternalColor8}{.}\textcolor{QuartoInternalColor2}{join(remarks)}

and here we have a problem with the \n that can be fixed by replacing it with \textbackslash{}n.

Steps to reproduce

--- 
title: "foo"
---

```{python}
#| error: true
import numpy as np
from numpy import linalg as LA

A = np.random.rand(3, 3)
X = LA.inv(A)
np.testing.assert_equal(A @ X, np.eye(A.shape[0]))
```                 

Expected behavior

I run:

quarto render file.qmd --debug --to pdf

I expected a pdf to be produced, containing the Python error message and traceback.

Actual behavior

quarto render file.qmd --to pdf

Starting python3 kernel...Done

Executing 'file.quarto_ipynb'
  Cell 1/1: ''...Done

pandoc 
  to: latex
  output-file: file.tex
  standalone: true
  pdf-engine: xelatex
  variables:
    graphics: true
    tables: true
  default-image-extension: pdf
  
metadata
  documentclass: scrartcl
  classoption:
    - DIV=11
    - numbers=noendperiod
  papersize: letter
  header-includes:
    - \KOMAoption{captions}{tableheading}
  block-headings: true
  title: foo
  

Rendering PDF
running xelatex - 1
  This is XeTeX, Version 3.141592653-2.6-0.999995 (TeX Live 2023/Debian) (preloaded format=xelatex)
   restricted \write18 enabled.
  entering extended mode
  
updating tlmgr

updating existing packages
ERROR: 
compilation failed- error
Undefined control sequence.
<argument> \n 
              
l.252 ...olor{QuartoInternalColor2}{join(remarks)}
                                                   

see file.log for more information.

Your environment

• Ubuntu 24.04
• Quarto > 1.6.39 (tested also with latest build on github)

Quarto check output

quarto check
Quarto 1.7.3
[✓] Checking environment information...
      Quarto cache location: ~/.cache/quarto
[✓] Checking versions of quarto binary dependencies...
      Pandoc version 3.4.0: OK
      Dart Sass version 1.70.0: OK
      Deno version 1.46.3: OK
      Typst version 0.11.0: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
      Version: 1.7.3
      Path: /tmp/quartodebug/.venv/lib/python3.12/site-packages/quarto_cli/quarto-1.7.3/bin

[✓] Checking tools....................OK
      TinyTeX: (not installed)
      Chromium: (not installed)

[✓] Checking LaTeX....................OK
      Using: Installation From Path
      Path: /usr/bin
      Version: 2023

[✓] Checking basic markdown render....OK

[✓] Checking Python 3 installation....OK
      Version: 3.12.3
      Path: /tmp/quartodebug/.venv/bin/python3
      Jupyter: 5.7.2
      Kernels: python3

[✓] Checking Jupyter engine render....OK

[✓] Checking R installation...........(None)

      Unable to locate an installed version of R.
      Install R from https://cloud.r-project.org/