03_list_if_in_else.ipynb

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   "source": [
    "# 3. In a bookstore\n",
    "\n",
    "## Lists and if... in... / else...\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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  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "---"
   ]
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   "cell_type": "markdown",
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   "source": [
    "- You are the owner of a bookstore. n the programming shelf there are:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "programming_books = [\"Learn python\", \"Python for all\",  \"Intro to python\"]\n",
    "print (programming_books)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "- A new customer comes in, and you ask what book she wants:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "wanted_book = input(\"Hi! What book would you like to buy?\")\n",
    "print (wanted_book)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "- You check if you have the book, and you reply accordingly:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "if wanted_book in programming_books:\n",
    "    print (\"Yes, we sell it!\")\n",
    "else:\n",
    "    print (\"Sorry, we don't sell that book\")"
   ]
  }
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