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January 27, 2022 02:19
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enumerate.ipynb
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{ | |
"cells": [ | |
{ | |
"cell_type": "code", | |
"execution_count": 3, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"<enumerate at 0x1baadf7a140>" | |
] | |
}, | |
"execution_count": 3, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"numeros = [5,1,-4,8,9,12,0,3,-1,8]\n", | |
"\n", | |
"enumerate(numeros)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 4, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"[(0, 5),\n", | |
" (1, 1),\n", | |
" (2, -4),\n", | |
" (3, 8),\n", | |
" (4, 9),\n", | |
" (5, 12),\n", | |
" (6, 0),\n", | |
" (7, 3),\n", | |
" (8, -1),\n", | |
" (9, 8)]" | |
] | |
}, | |
"execution_count": 4, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"# Como puedes ver es un tipo de dato especial llamado enumerate\n", | |
"# ¿Pero y si lo transformamos a lista?\n", | |
"\n", | |
"list(enumerate(numeros))" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 5, | |
"metadata": {}, | |
"outputs": [], | |
"source": [ | |
"# Fíjate como tenemos en este punto una lista con tuplas (a, b)\n", | |
"# El primer valor \"a\" de cada tupla hace referencia a su posición en la lista\n", | |
"# El segundo valor \"b\" de cada tupla hace referencia a su valor en la lista" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 6, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"name": "stdout", | |
"output_type": "stream", | |
"text": [ | |
"Pepe 24\n", | |
"Juan 31\n", | |
"María 25\n" | |
] | |
} | |
], | |
"source": [ | |
"# Ahora falta entender cómo el for toma estos valores de la lista con tuplas\n", | |
"# Y lo hace ni más ni menos que por orden en función de las variables definidas\n", | |
"# Imagina esta lista de tuplas\n", | |
"\n", | |
"personas = [(\"Pepe\", 24), (\"Juan\", 31), (\"María\", 25)]\n", | |
"\n", | |
"# El primer valor de las tuplas hace referencia a un nombre\n", | |
"# El segundo valor de las tuplas hace referencia a una edad\n", | |
"for nombre, edad in personas:\n", | |
" print(nombre, edad)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 7, | |
"metadata": {}, | |
"outputs": [], | |
"source": [ | |
"# Como ves podemos recorrer dinámicamente los valores de las tuplas\n", | |
"# almacenándolos a su vez en las variables del for nombre,edad " | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 10, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"name": "stdout", | |
"output_type": "stream", | |
"text": [ | |
"0 5\n", | |
"1 1\n", | |
"2 -4\n", | |
"3 8\n", | |
"4 9\n", | |
"5 12\n", | |
"6 0\n", | |
"7 3\n", | |
"8 -1\n", | |
"9 8\n" | |
] | |
} | |
], | |
"source": [ | |
"# Por tanto \"enumerate\" transforma la lista a una lista de posiciones y valores\n", | |
"# permitiéndonos almacenarlas en dos variables para hacer lo que necesitemos\n", | |
"\n", | |
"numeros = [5,1,-4,8,9,12,0,3,-1,8]\n", | |
"\n", | |
"for VALOR_1, VALOR_2 in enumerate(numeros):\n", | |
" print(VALOR_1, VALOR_2)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": null, | |
"metadata": {}, | |
"outputs": [], | |
"source": [ | |
"# Pero para entendernos mejor nombramos las variables acorde a lo que contienen\n", | |
"for indice, numero in enumerate(numeros):\n", | |
" print(indice, numero)" | |
] | |
} | |
], | |
"metadata": { | |
"kernelspec": { | |
"display_name": "Python 3", | |
"language": "python", | |
"name": "python3" | |
}, | |
"language_info": { | |
"codemirror_mode": { | |
"name": "ipython", | |
"version": 3 | |
}, | |
"file_extension": ".py", | |
"mimetype": "text/x-python", | |
"name": "python", | |
"nbconvert_exporter": "python", | |
"pygments_lexer": "ipython3", | |
"version": "3.9.1" | |
} | |
}, | |
"nbformat": 4, | |
"nbformat_minor": 4 | |
} |
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