{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "0ff51f78-7a53-437f-822a-e0ade6730946",
   "metadata": {
    "tags": []
   },
   "source": [
    "Iteradores --- 5:38 min\n",
    "===\n",
    "\n",
    "* 05:38 min | Última modificación: Octubre 5, 2021"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "d47b1829-5214-4be6-99cf-c1feb2af9403",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "a\n",
      "b\n",
      "c\n",
      "d\n",
      "e\n",
      "f\n",
      "g\n"
     ]
    }
   ],
   "source": [
    "#\n",
    "# Estructura típica de un ciclo for\n",
    "# =============================================================================\n",
    "#\n",
    "letter_list = [\"a\", \"b\", \"c\", \"d\", \"e\", \"f\", \"g\"]\n",
    "for letter in letter_list:\n",
    "    print(letter)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "ddea5a84-5959-496a-b024-09829927f090",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'a'"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "'b'"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "'c'"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "#\n",
    "# Construcción de un iterador\n",
    "# =============================================================================\n",
    "#\n",
    "letter_iterator = iter(letter_list)\n",
    "\n",
    "#\n",
    "# Extracción de los elementos usando next()\n",
    "#\n",
    "display(\n",
    "    next(letter_iterator),\n",
    "    next(letter_iterator),\n",
    "    next(letter_iterator),\n",
    ")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "53c1a977-e8fa-42fe-b07e-e139ecd8e63b",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'d'"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "'e'"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "'f'"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "'g'"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "#\n",
    "# Iteración con *\n",
    "# =============================================================================\n",
    "# El operador * extrae todos los elementos de una vez\n",
    "#\n",
    "display(*letter_iterator)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "d1b087fa-e40e-4918-a6d1-6caad41f3b63",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "a 1\n",
      "b 2\n",
      "c 3\n"
     ]
    }
   ],
   "source": [
    "#\n",
    "# Iteración sobre un diccionario\n",
    "# =============================================================================\n",
    "#\n",
    "my_dict = {\n",
    "    \"a\": 1,\n",
    "    \"b\": 2,\n",
    "    \"c\": 3,\n",
    "}\n",
    "\n",
    "for key, value in my_dict.items():\n",
    "    print(key, value)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "5fb04429-c6d5-4deb-adc4-c141b0453f40",
   "metadata": {},
   "outputs": [],
   "source": [
    "#\n",
    "# Iteración sobre conexiones de artchivos\n",
    "# =============================================================================\n",
    "#"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "b32db6ff-53b0-4fe1-815a-9a8b233fa0bd",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Overwriting /tmp/demo.txt\n"
     ]
    }
   ],
   "source": [
    "%%writefile /tmp/demo.txt\n",
    "linea 1\n",
    "linea 2\n",
    "linea 3\n",
    "linea 4"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "dcbe1e32-dac2-4e62-b38f-e5f16208be1c",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'linea 1\\n'"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "'linea 2\\n'"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "file = open(\"/tmp/demo.txt\", \"r\")\n",
    "display(\n",
    "    next(file),\n",
    "    next(file),\n",
    ")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "id": "75895b6d-237b-4864-be6a-788b74b2d2d5",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "0"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "1"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "2"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "#\n",
    "# Iteración sobre un rango\n",
    "# =============================================================================\n",
    "#\n",
    "range_iterator = iter(range(4))\n",
    "display(\n",
    "    next(range_iterator),\n",
    "    next(range_iterator),\n",
    "    next(range_iterator),\n",
    ")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "id": "9dfa8cc9-5a08-4e81-b6bf-2b3fa857bef3",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[0, 1, 2, 3]"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "#\n",
    "# Conversión de un objeto rango a una lista\n",
    "# =============================================================================\n",
    "#\n",
    "list(range(4))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "id": "3e7b997a-ee9b-4706-b4ab-a243a8309931",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "enumerate"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "[(0, 'a'), (1, 'b'), (2, 'c'), (3, 'd'), (4, 'e'), (5, 'f'), (6, 'g')]"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "#\n",
    "# Construcción de una enumeración\n",
    "# # =============================================================================\n",
    "#\n",
    "letter_list = [\"a\", \"b\", \"c\", \"d\", \"e\", \"f\", \"g\"]\n",
    "enum = enumerate(letter_list)\n",
    "display(\n",
    "    type(enum),\n",
    "    list(enum),\n",
    ")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "id": "5eba8464-bb1a-4514-9e46-ed84608b5590",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0 a\n",
      "1 b\n",
      "2 c\n",
      "3 d\n",
      "4 e\n",
      "5 f\n",
      "6 g\n"
     ]
    }
   ],
   "source": [
    "#\n",
    "# Uso de enumerate en un ciclo for\n",
    "#\n",
    "for i_letter, letter in enumerate(letter_list):\n",
    "    print(i_letter, letter)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "id": "93b39202-00cd-4e78-8bd7-417c5c820050",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "10 a\n",
      "11 b\n",
      "12 c\n",
      "13 d\n",
      "14 e\n",
      "15 f\n",
      "16 g\n"
     ]
    }
   ],
   "source": [
    "#\n",
    "# Uso de enumerate en un ciclo for\n",
    "#\n",
    "for i_letter, letter in enumerate(letter_list, start=10):\n",
    "    print(i_letter, letter)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "id": "78ca247e-00ab-471d-9755-01d0a5490767",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "zip"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "[('A', 'a'), ('B', 'b'), ('C', 'c'), ('D', 'd'), ('E', 'e')]"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "#\n",
    "# Función zip()\n",
    "# =============================================================================\n",
    "#\n",
    "uppercase = [\"A\", \"B\", \"C\", \"D\", \"E\"]\n",
    "lowercase = [\"a\", \"b\", \"c\", \"d\", \"e\"]\n",
    "zipped = zip(uppercase, lowercase)\n",
    "display(\n",
    "    type(zipped),\n",
    "    list(zipped),\n",
    ")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "id": "89eee2db-3577-4d04-b34c-ba8300001efa",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "('A', 'a')"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "('B', 'b')"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "('C', 'c')"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "('D', 'd')"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "('E', 'e')"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "#\n",
    "# Uso de * con zip\n",
    "# =============================================================================\n",
    "#\n",
    "zipped = zip(uppercase, lowercase)\n",
    "display(*zipped)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "id": "c467c167-2f6e-4d13-bed5-803a786c2b95",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "('A', 'a')"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "('B', 'b')"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "('C', 'c')"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "('D', 'd')"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "('E', 'e')"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "#\n",
    "# Uso en un ciclo for\n",
    "#\n",
    "for items in zip(uppercase, lowercase):\n",
    "    display(items)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "id": "220573ee-0c11-413c-8397-b54faa14c1d3",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'A a'"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "'B b'"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "'C c'"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "'D d'"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "'E e'"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "#\n",
    "# Forma más comun\n",
    "#\n",
    "for item1, item2 in zip(uppercase, lowercase):\n",
    "    display(item1 + \" \" + item2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "id": "ba06789f-0756-42da-8f47-e19ac92baa4c",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "('A', 'B', 'C', 'D', 'E')"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "('a', 'b', 'c', 'd', 'e')"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "zipped = zip(uppercase, lowercase)\n",
    "a, b = zip(*zipped)\n",
    "display(a, b)"
   ]
  }
 ],
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   "display_name": "Python 3",
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