import os

commandes = [ "pdflatex trigo.tex",
              "magick convert trigo.pdf im-%02d.jpg",
              "magick convert im-*.jpg trigo.gif",
              "del *.aux, *.log, *.pdf, *.jpg"
            ]
for cmd in commandes:
    texte = 'echo '+cmd[0]
    os.system(texte)
    os.system(cmd[1])

run = 'trigo.gif'
os.system(run)