Pas de résultat avec pythontex

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\documentclass[12pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[french]{babel}
\usepackage[T1]{fontenc}
\usepackage{mathtools}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{pythontex}
\begin{document}
\begin{pycode}
from sympy import *
x, y = symbols('x y')
\end{pycode}
\section{Développements, factorisations...}
Une expression : $x(x + 2y)$
\begin{pycode}
exp = x*(x + 2*y)
dev_exp = expand(exp)
\end{pycode}
La dérivée de la fonction définie par $\cos(x)$ est : $\py{latex(diff(cos(x), x))}$
Une primitive de la fonction définie par $\cos(x)$ est : $\py{latex(integrate(cos(x), x))}$
La limite de la fonction $\frac{ln(x)}{x}$ en $+\infty$ est : $\py{latex(limit(ln(x)/x, x, oo))}$
La limite de la fonction $\frac{1}{x}$ en $0^{+}$ est : $\py{latex(limit(1/x, x, 0, '+'))}$
La limite de la fonction $\frac{1}{x}$ en $0^{-}$ est : $\py{latex(limit(1/x, x, 0, '-'))}$
\end{document}
 
 
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Voici le fichier log :

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This is pdfTeX, Version 3.14159265-2.6-1.40.21 (TeX Live 2020) (preloaded format=pdflatex 2020.10.4)  6 OCT 2020 17:04
entering extended mode
 write18 enabled.
 %&-line parsing enabled.
**compilation_pythontex.tex
(./compilation_pythontex.tex
LaTeX2e <2020-10-01>
L3 programming layer <2020-09-24> xparse <2020-03-03>
(/usr/local/texlive/2020/texmf-dist/tex/latex/base/article.cls
Document Class: article 2020/04/10 v1.4m Standard LaTeX document class
(/usr/local/texlive/2020/texmf-dist/tex/latex/base/size12.clo
File: size12.clo 2020/04/10 v1.4m Standard LaTeX file (size option)
)
c@part=count175
c@section=count176
c@subsection=count177
c@subsubsection=count178
c@paragraph=count179
c@subparagraph=count180
c@figure=count181
c@table=count182
abovecaptionskip=skip47
belowcaptionskip=skip48
bibindent=dimen138
)
(/usr/local/texlive/2020/texmf-dist/tex/latex/base/inputenc.sty
Package: inputenc 2020/08/01 v1.3d Input encoding file
inpenc@prehook=toks15
inpenc@posthook=toks16
)
(/usr/local/texlive/2020/texmf-dist/tex/generic/babel/babel.sty
Package: babel 2020/10/03 3.49 The Babel package
(/usr/local/texlive/2020/texmf-dist/tex/generic/babel/babel.def
File: babel.def 2020/10/03 3.49 Babel common definitions
babel@savecnt=count183
U@D=dimen139
l@babelnohyphens=language86
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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ubuntu 20.04 texlive 2020

commande texstudio : pdflatex --shell-escape -synctex=1 -interaction=nonstopmode %.tex |python3 /usr/local/bin/pythontex.py %.tex|pdflatex --shell-escape -synctex=1 -interaction=nonstopmode %.tex|"/usr/bin/evince" %.pdf

En exécutant les trois étapes, et avec pythontex :

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This is PythonTeX 0.17
multiprocessing.pool.RemoteTraceback: 
"""
Traceback (most recent call last):
  File "/usr/local/texlive/2020/texmf-dist/scripts/pythontex/pythontex3.py", line 1560, in run_code
    proc = subprocess.Popen(exec_cmd, stdout=out_file, stderr=err_file)
  File "/usr/lib/python3.8/subprocess.py", line 854, in init
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/usr/lib/python3.8/subprocess.py", line 1702, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'python'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/usr/lib/python3.8/multiprocessing/pool.py", line 125, in worker
    result = (True, func(args, *kwds))
  File "/usr/local/texlive/2020/texmf-dist/scripts/pythontex/pythontex3.py", line 1563, in run_code
    except WindowsError as e:
NameError: name 'WindowsError' is not defined
"""
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
  File "/usr/local/bin/pythontex", line 62, in 
    pythontex.main()
  File "/usr/local/texlive/2020/texmf-dist/scripts/pythontex/pythontex3.py", line 2811, in main
    do_multiprocessing(data, temp_data, old_data, engine_dict)
  File "/usr/local/texlive/2020/texmf-dist/scripts/pythontex/pythontex3.py", line 1383, in do_multiprocessing
    result = task.get()
  File "/usr/lib/python3.8/multiprocessing/pool.py", line 768, in get
    raise self._value
 
 
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