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   "source": [
    "Ámbito y variables en funciones\n",
    "===\n",
    "\n",
    "* Duración de la lección: 7:24 min"
   ]
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     "text": [
      "wick.john\n"
     ]
    }
   ],
   "source": [
    "#\n",
    "# Accesso a variables definidas fuera del ámbito de la función\n",
    "# =============================================================================\n",
    "#\n",
    "username = \"wick.john\"\n",
    "\n",
    "\n",
    "def print_username():\n",
    "    print(username)\n",
    "\n",
    "\n",
    "print_username()"
   ]
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    "Explicación:\n",
    "\n",
    "     \n",
    "     +-- Ambiente del módulo -------------+      +-- Ambiente de la función ------------------+        \n",
    "     | {                                  |      | creado con la llamada a la funcion         |\n",
    "     |     'username': \"wick.john\",       |      | {                                          |\n",
    "     |     'print_username': #function,   | <=== |     'ambiente_padre': ambiente del modulo  |\n",
    "     | }                                  |      | }                                          |\n",
    "     +------------------------------------+      +--------------------------------------------+\n",
    "    \n",
    "    "
   ]
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  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "75efc879-a4ea-44bb-b079-872ed614af4f",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "inside: 3\n",
      "outside: 5\n"
     ]
    }
   ],
   "source": [
    "#\n",
    "# Ambito de las variables\n",
    "# =============================================================================\n",
    "#\n",
    "int_var = 5\n",
    "\n",
    "\n",
    "def my_function(int_var):\n",
    "    int_var = 3\n",
    "    print(\"inside:\", int_var)\n",
    "\n",
    "\n",
    "my_function(int_var)\n",
    "print(\"outside:\", int_var)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "be3d14a5-532d-485d-ad0b-86f34a5ac539",
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   "source": [
    "    Codigo                Memoria\n",
    "    -----------------------------------------------------------\n",
    "                          ambiente = {}, funcion = {}\n",
    "    int_var = 5\n",
    "                          ambiente = {'int_var': 5}, funcion = {}\n",
    "    my_function(int_var)\n",
    "                          ambiente = {'int_var': 5}, funcion = {'int_var': 5}\n",
    "        (cuerpo de la funcion)\n",
    "        int_var = 3\n",
    "                          ambiente = {'int_var': 5}, funcion = {'int_var': 3}"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "f8056636-5404-41b3-901f-65f1daba139e",
   "metadata": {},
   "source": [
    "## Comandos global y nonlocal"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "348668ed-65a4-4cc0-926b-a2560a3605b4",
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   "source": [
    "#\n",
    "# Se define la variable como global\n",
    "#\n",
    "global_var = 0\n",
    "\n",
    "\n",
    "def user_function():\n",
    "    \"\"\"Cambia el valor de la variable global\"\"\"\n",
    "    global global_var\n",
    "    global_var += 1\n",
    "\n",
    "\n",
    "display(global_var)\n",
    "user_function()\n",
    "display(global_var)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "43933540-696e-46e0-a3a8-78714360fae9",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "2\n",
      "1\n"
     ]
    }
   ],
   "source": [
    "#\n",
    "# Sin nonlocal\n",
    "#\n",
    "def outer():\n",
    "    n = 1\n",
    "\n",
    "    def inner():\n",
    "        n = 2\n",
    "        print(n)\n",
    "\n",
    "    inner()\n",
    "    print(n)\n",
    "\n",
    "\n",
    "outer()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "407d6463-4e5a-455f-9566-c5e6a655fdac",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "2\n",
      "2\n"
     ]
    }
   ],
   "source": [
    "#\n",
    "# Con nonlocal\n",
    "#\n",
    "def outer():\n",
    "    n = 1\n",
    "\n",
    "    def inner():\n",
    "        nonlocal n\n",
    "        n = 2\n",
    "        print(n)\n",
    "\n",
    "    inner()\n",
    "    print(n)\n",
    "\n",
    "\n",
    "outer()"
   ]
  }
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