How can python code be used to generate rows in a tabularray?

[kiryph]

pythontex describes two options to use python code within a tabular environment:

• The tabular environment can conflict with PythonTeX under some circumstances, due to how tabular functions. Among other things, printing within a tabular environment can cause errors, because printing involves bringing in external content via \InputIfFileExists, but that macro is not expandable. There are a few different ways to work around the limitations of tabular.
  • Put the printed content in a macro definition, and use the macro in tabular. You will have to create a dummy version of the macro, to avoid errors before the macro is defined by PythonTeX. An example is given below. The \global\def is needed so that the macro is defined outside of the pycode environment.

   \let\row\relax
   \begin{pycode}
   print("\\global\\def\\row{a & b & c & d & e \\\\}")
   \end{pycode}
  
   \begin{tabular}{|c|c|c|c|c|}
   \row
   \end{tabular} 

  • Use \py. The end-of-row \\ must be outside of the command. Example:

   \begin{tabular}{|c|c|c|c|c|}
   \py{"a & b & c & d & e"} \\
   \end{tabular} 

Unfortunately, both do not work with tabularray.

Is there anything else to consider?

IMHO using an embedded scripting language is in particular useful for tables.
Other options might be luatex or perltex. However, I import a graphml file with networkx which makes python the right choice of scripting language.
The end goal is a similar matrix as following one

https://commons.wikimedia.org/wiki/File:Z2%5E4;_Lattice_of_subgroups_Hasse_diagram_adjacency_matrix.svg

Minimal Failing Example using Pyluatex

(single lualatex run to generate pdf)

%! TeX program = lualatex
\documentclass{article}
\usepackage{pyluatex}
\usepackage{tabularray}

\begin{document}
% needs to be after document
\let\row\relax
\begin{python}
print("\\global\\def\\row{a & b & c & d & e \\\\}")
\end{python}

\begin{tblr}{|c|c|c|c|c|}
a & b & c & d & e \\
\row
\end{tblr}

\end{document}

❯ lualatex --output-format=pdf --shell-escape pythontex-tabularray.tex
This is LuaHBTeX, Version 1.15.0 (TeX Live 2022)
 system commands enabled.
(./pythontex-tabularray.tex
LaTeX2e <2021-11-15> patch level 1
 L3 programming layer <2022-02-24>
(/usr/local/texlive/2022/texmf-dist/tex/latex/base/article.cls
Document Class: article 2021/10/04 v1.4n Standard LaTeX document class
(/usr/local/texlive/2022/texmf-dist/tex/latex/base/size10.clo))
(/usr/local/texlive/2022/texmf-dist/tex/lualatex/pyluatex/pyluatex.sty
(/usr/local/texlive/2022/texmf-dist/tex/latex/l3kernel/expl3.sty
(/usr/local/texlive/2022/texmf-dist/tex/latex/l3backend/l3backend-luatex.def))
(/usr/local/texlive/2022/texmf-dist/tex/latex/kvoptions/kvoptions.sty
(/usr/local/texlive/2022/texmf-dist/tex/latex/graphics/keyval.sty)
(/usr/local/texlive/2022/texmf-dist/tex/generic/ltxcmds/ltxcmds.sty)
(/usr/local/texlive/2022/texmf-dist/tex/generic/kvsetkeys/kvsetkeys.sty))
(/usr/local/texlive/2022/texmf-dist/tex/latex/base/atveryend-ltx.sty))
(/usr/local/texlive/2022/texmf-dist/tex/latex/tabularray/tabularray.sty)
(./pythontex-tabularray.aux)
(/usr/local/texlive/2022/texmf-dist/tex/latex/base/ts1cmr.fd)
! Misplaced alignment tab character &.
\row ->a &
           b & c & d & e \\
l.17 \end
       {tblr}
?

[lvjr]

Sorry, I am not able to visit wikimedia website.

You need to use outer key expand with tblr environment:

 \begin{tblr}[expand=\row]{|c|c|c|c|c|}
 \row
 \end{tblr} 

Also you can use functional library of tabularray package to build table rows. See the manual and this example https://tex.stackexchange.com/questions/645074/generate-tabularray-and-compute-sub-result-for-each-row-using-functional-library

[kiryph]

Sorry, I am not able to visit wikimedia website.

I have inserted a screenshot.