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danielomiya/a2_python_exerc.ipynb

Created February 23, 2023 21:27
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A2_Python_Exerc.ipynb
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a2_python_exerc.ipynb
{
"nbformat": 4,
"nbformat_minor": 0,
"metadata": {
"colab": {
"name": "A2_Python_Exerc.ipynb",
"provenance": [],
"include_colab_link": true
},
"kernelspec": {
"name": "python3",
"display_name": "Python 3"
},
"language_info": {
"name": "python"
}
},
"cells": [
{
"cell_type": "markdown",
"metadata": {
"id": "view-in-github",
"colab_type": "text"
},
"source": [
"<a href=\"https://colab.research.google.com/gist/gwyddie/6f3a77a7174026872850f8c2533bc1b0/a2_python_exerc.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
]
},
{
"cell_type": "markdown",
"metadata": {
"id": "pqEhMdFQO3A-"
},
"source": [
"<head>\n",
" <meta name=\"author\" content=\"Rogério de Oliveira\">\n",
" <meta institution=\"author\" content=\"Universidade Presbiteriana Mackenzie\">\n",
"</head>\n",
"\n",
"<img src=\"http://meusite.mackenzie.br/rogerio/mackenzie_logo/UPM.2_horizontal_vermelho.jpg\" width=300, align=\"right\"> \n",
"\n",
"\n",
"\n",
"<br>\n",
"<br>\n",
"\n",
"<br>\n",
"<br>\n",
"\n",
"\n",
"<br>\n",
"<br>\n",
"\n",
"---\n"
]
},
{
"cell_type": "markdown",
"metadata": {
"id": "42yF1G-yHu98"
},
"source": [
"# Exercícios"
]
},
{
"cell_type": "markdown",
"metadata": {
"id": "BDm3FTRtWXCY"
},
"source": [
"Em todos os exercícios execute o código abaixo como a primeira instrução e uma única vez para gerar os valores de `letras` e `lista`.\n",
"\n",
"Todos exercícios possuem várias soluções possíveis, mas não se preocupe com isso. A melhor solução é primeiro, a que funciona para você!"
]
},
{
"cell_type": "code",
"metadata": {
"colab": {
"base_uri": "https://localhost:8080/"
},
"id": "xBjopVrbVgb5",
"outputId": "0c35b3b7-376c-4075-fa9c-7fd073d2a87c"
},
"source": [
"import numpy as np\n",
"import random\n",
"from random import choices\n",
"import string\n",
"\n",
"random.seed(1234)\n",
"letras = choices(string.ascii_lowercase,k=100)\n",
"lista = random.sample(range(1, 10000), 1000)\n",
"print(np.array(lista).sum() == 5244799) # precisa retornar True!"
],
"execution_count": 1,
"outputs": [
{
"output_type": "stream",
"name": "stdout",
"text": [
"True\n"
]
}
]
},
{
"cell_type": "markdown",
"metadata": {
"id": "XEngnerfXmKX"
},
"source": [
"1. Dos valores [9887, 3233, 813] qual o índice dos valores presentes em `lista`? "
]
},
{
"cell_type": "code",
"metadata": {
"id": "8KlbNKnHR6VZ",
"colab": {
"base_uri": "https://localhost:8080/",
"height": 218
},
"outputId": "c341ef69-02a6-435e-d05e-c0eac5c159b9"
},
"source": [
"for idx in (9887, 3233, 813):\n",
" print(lista.index(idx))"
],
"execution_count": 2,
"outputs": [
{
"output_type": "stream",
"name": "stdout",
"text": [
"877\n",
"680\n"
]
},
{
"output_type": "error",
"ename": "ValueError",
"evalue": "ignored",
"traceback": [
"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
"\u001b[0;31mValueError\u001b[0m Traceback (most recent call last)",
"\u001b[0;32m<ipython-input-2-526df33b4abd>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m 1\u001b[0m \u001b[0;32mfor\u001b[0m \u001b[0midx\u001b[0m \u001b[0;32min\u001b[0m \u001b[0;34m(\u001b[0m\u001b[0;36m9887\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;36m3233\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0;36m813\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 2\u001b[0;31m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mlista\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mindex\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0midx\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[0;31mValueError\u001b[0m: 813 is not in list"
]
}
]
},
{
"cell_type": "markdown",
"metadata": {
"id": "95H7DlB_YARA"
},
"source": [
"2. Quais os dois primeiros valores maiores que 2046 em `lista`?"
]
},
{
"cell_type": "code",
"metadata": {
"id": "BknXd3WYST7B",
"colab": {
"base_uri": "https://localhost:8080/"
},
"outputId": "63af9e7b-75e8-4dce-bdc5-ffd247d0831b"
},
"source": [
"tmp = iter(sorted(elem for elem in lista if elem > 2046))\n",
"next(tmp), next(tmp)"
],
"execution_count": 3,
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": [
"(2055, 2064)"
]
},
"metadata": {},
"execution_count": 3
}
]
},
{
"cell_type": "markdown",
"metadata": {
"id": "_i-bSWW9YNa_"
},
"source": [
"3. Quais os valores mínimo e máximo em `lista`? "
]
},
{
"cell_type": "code",
"metadata": {
"id": "wnhzxGXfQr6Q",
"colab": {
"base_uri": "https://localhost:8080/"
},
"outputId": "2885278e-73c5-48ad-9f56-692c870ce7e8"
},
"source": [
"min(lista), max(lista)"
],
"execution_count": 4,
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": [
"(4, 9998)"
]
},
"metadata": {},
"execution_count": 4
}
]
},
{
"cell_type": "markdown",
"metadata": {
"id": "Fs5Ys1kybzDz"
},
"source": [
"4. Quais as 4 letras que mais aparecem em `letras`?\n",
"\n",
"<small> ( Existe várias formas de fazer isso, mas fica aqui a sugestão: se você implementar um dicionário *letra:quantidade* poderá empregar a mesma solução na tarefa de aprofundamento! ) </small> "
]
},
{
"cell_type": "code",
"metadata": {
"id": "dna43p-3TcPH",
"colab": {
"base_uri": "https://localhost:8080/"
},
"outputId": "2c10b2de-701b-4434-870f-48cab94a7379"
},
"source": [
"from collections import defaultdict\n",
"from operator import itemgetter\n",
"\n",
"\n",
"freq = defaultdict(lambda: 0)\n",
"for letra in letras:\n",
" freq[letra] += 1\n",
"\n",
"\n",
"tmp = iter(sorted(freq.items(), key=itemgetter(1), reverse=True))\n",
"next(tmp), next(tmp), next(tmp), next(tmp)"
],
"execution_count": 5,
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": [
"(('e', 8), ('v', 8), ('m', 7), ('a', 6))"
]
},
"metadata": {},
"execution_count": 5
}
]
},
{
"cell_type": "markdown",
"metadata": {
"id": "cdADnpZFZKxg"
},
"source": [
"5. Qual a soma dos valores pares de `lista`?"
]
},
{
"cell_type": "code",
"metadata": {
"id": "2MOHct7HZIWo",
"colab": {
"base_uri": "https://localhost:8080/"
},
"outputId": "3099ddeb-dcf0-4ba5-b71c-ed419b4391df"
},
"source": [
"acc = 0\n",
"\n",
"for elem in lista:\n",
" if elem % 2 == 0:\n",
" acc += elem\n",
"\n",
"acc"
],
"execution_count": 6,
"outputs": [
{
"output_type": "execute_result",
"data": {
"text/plain": [
"2687196"
]
},
"metadata": {},
"execution_count": 6
}
]
}
]
}
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