12_for_create_list.ipynb

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    "# 12. What a mess at the bookstore!\n",
    "\n",
    "## For loop to create new lists\n",
    "\n",
    "[Learn Python with Jupyter](https://learnpythonwithjupyter.com/) by [Serena Bonaretti](https://sbonaretti.github.io/)   \n",
    "Narrative license: [CC BY-NC-SA](https://creativecommons.org/licenses/by-nc-sa/2.0/). Code license: [GNU-GPL v3](https://www.gnu.org/licenses/gpl-3.0.en.html)  \n"
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    "---"
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    "- There were many customers in the shop today, and they mixed up the books whose authors’ last names start with A and S:"
   ]
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   "source": [
    "authors = [\"Alcott\", \"Saint-Exupery\", \"Arendt\", \"Sepulveda\", \"Shakespeare\"]"
   ]
  },
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    "- So you have to put the books whose authors’ last name starts with A on one shelf, and the books whose authors’ last name starts with S on another shelf:"
   ]
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    "# initialize the variables as empty lists\n",
    "shelf_a = []\n",
    "shelf_s = []\n",
    "\n",
    "# for each position in the list\n",
    "for i in range (len(authors)):\n",
    "    \n",
    "    # print out the current element\n",
    "    print (\"The current author is: \" + authors[i])\n",
    "    \n",
    "    # get the initial of the current author\n",
    "    author_initial = authors[i][0] \n",
    "    print (\"The author's initial is: \" + author_initial)\n",
    "    \n",
    "    # if the author's initial is A\n",
    "    if author_initial == \"A\": \n",
    "        # add the author to the shelf a\n",
    "        shelf_a.append(authors[i])\n",
    "        print (\"The shelf A now contains: \" + str(shelf_a) + \"\\n\")\n",
    "    \n",
    "    # otherwise (author's initial is not A)\n",
    "    else:\n",
    "        # add the author to the shelf s\n",
    "        shelf_s = shelf_s + [authors[i]]\n",
    "        print (\"The shelf S now contains: \" + str(shelf_s) + \"\\n\")\n",
    "\n",
    "# print out the final shelves\n",
    "print (\"The authors on the shelf A are: \" + str(shelf_a))\n",
    "print (\"The authors on the shelf S are: \" + str(shelf_s))      "
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