Parte 1 - Expressões e Variáveis.ipynb

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   "cell_type": "markdown",
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   "source": [
    "## Expressões\n",
    "Os programas são compostos de expressões, que descrevem ao computador como combinar partes de dados."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
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      "text/plain": [
       "12"
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     "execution_count": 1,
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   "source": [
    "3 * 4"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
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     "ename": "SyntaxError",
     "evalue": "invalid syntax (<ipython-input-2-012ea60b41dd>, line 1)",
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      "\u001b[1;36m  File \u001b[1;32m\"<ipython-input-2-012ea60b41dd>\"\u001b[1;36m, line \u001b[1;32m1\u001b[0m\n\u001b[1;33m    3 * * 4\u001b[0m\n\u001b[1;37m        ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m invalid syntax\n"
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   "source": [
    "3 * * 4"
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  {
   "cell_type": "code",
   "execution_count": null,
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    "3 ** 4"
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   "cell_type": "code",
   "execution_count": null,
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   "source": [
    "1 + 2 * 3 * 4 * 5 / 6 ** 3 + 7 + 8 - 9 + 10"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "1 + 2 * (3 * 4 * 5 / 6) ** 3 + 7 + 8 - 9 + 10"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Variáveis\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "a = 10\n",
    "b = 20\n",
    "a + b"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "quarter = 1/4\n",
    "half = 2 * quarter\n",
    "half"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "quarter = 4\n",
    "half"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Examplo\n",
    "purchase_price = 5\n",
    "state_tax_rate = 0.075\n",
    "county_tax_rate = 0.02\n",
    "city_tax_rate = 0\n",
    "sales_tax_rate = state_tax_rate + county_tax_rate + city_tax_rate\n",
    "sales_tax = purchase_price * sales_tax_rate\n",
    "sales_tax"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Aumento"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "####  Taxas de crescimento"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "initial = 2766000\n",
    "changed = 2814000\n",
    "(changed - initial) / initial"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Também podermos fazer\n",
    "(changed/initial) - 1"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Exemplos"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "1) Em dez anos, o número de funcionários do Governo Federal dos EUA aumentou em apenas 1,74%. Durante esse período, o total de despesas do governo federal dos EUA aumentou de US 2,37 trilhões para $3,38 trilhões em 2012."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "initial = 2.37\n",
    "changed = 3.38\n",
    "(changed/initial) - 1"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "2) O número de trabalhos na indústria transformadora nos EUA diminuiu de 15,3 milhões em 2002 para 11,9 milhões em 2012, uma taxa de crescimento de -22,2%"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "initial = 15.3\n",
    "changed = 11.9\n",
    "(changed/initial) - 1"
   ]
  }
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