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   "source": [
    "[prev: Les générateurs](generator.ipynb) | [home](../index.ipynb)"
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   "source": [
    "# Rendre un script importable\n"
   ]
  },
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   "metadata": {},
   "source": [
    "Voici le contenu typique d'un script python\n",
    "\n",
    "``` python\n",
    "## fichier: mon_script_bof.py\n",
    "\n",
    "...  # on fait des trucs compliqués\n",
    "print(\"message important\")\n",
    "```\n",
    "\n",
    "Le problème avec \"mon_script_bof.py\" : on ne peut pas faire `import mon_script_bof` sans lancer effectivement le calcul.\n",
    "\n",
    "La solution est dans la formule magique : `if __name__ == '__main__': ...`.\n",
    "Ce qui suit le `if` n'est pas exécuter lors de `import`.\n",
    "\n",
    "``` python\n",
    "## fichier: mon_script_bien.py\n",
    "\n",
    "def main():\n",
    "    ...  # on fait des trucs compliqués\n",
    "    print(\"message important\")\n",
    "    \n",
    "    \n",
    "if __name__ == '__main__':\n",
    "    main()\n",
    "```"
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