Cap04-11-Erros-Excecoes-Try-Except-Finally.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# <font color='blue'>Python Fundamentos - Capítulo 4</font>\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Versão da Linguagem Python Usada Neste Jupyter Notebook: 3.7.6\n"
     ]
    }
   ],
   "source": [
    "# Versão da Linguagem Python\n",
    "from platform import python_version\n",
    "print('Versão da Linguagem Python Usada Neste Jupyter Notebook:', python_version())"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Erros e Exceções"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "ename": "SyntaxError",
     "evalue": "EOL while scanning string literal (<ipython-input-2-8a4956c51ec3>, line 2)",
     "output_type": "error",
     "traceback": [
      "\u001b[0;36m  File \u001b[0;32m\"<ipython-input-2-8a4956c51ec3>\"\u001b[0;36m, line \u001b[0;32m2\u001b[0m\n\u001b[0;31m    print('Olá)\u001b[0m\n\u001b[0m               ^\u001b[0m\n\u001b[0;31mSyntaxError\u001b[0m\u001b[0;31m:\u001b[0m EOL while scanning string literal\n"
     ]
    }
   ],
   "source": [
    "# Erro\n",
    "print('Olá)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Criando uma função\n",
    "def numDiv (num1, num2):\n",
    "    resultado = num1 / num2\n",
    "    print(resultado)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "2.0\n"
     ]
    }
   ],
   "source": [
    "# Execução não gera erro\n",
    "numDiv(4,2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "ename": "ZeroDivisionError",
     "evalue": "division by zero",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mZeroDivisionError\u001b[0m                         Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-5-b0b571bcf93d>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m      1\u001b[0m \u001b[0;31m# Execução gerando erro\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[0mnumDiv\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;36m4\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0;36m0\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[0;32m<ipython-input-3-b4d5bff9dfcf>\u001b[0m in \u001b[0;36mnumDiv\u001b[0;34m(num1, num2)\u001b[0m\n\u001b[1;32m      1\u001b[0m \u001b[0;31m# Criando uma função\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      2\u001b[0m \u001b[0;32mdef\u001b[0m \u001b[0mnumDiv\u001b[0m \u001b[0;34m(\u001b[0m\u001b[0mnum1\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mnum2\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----> 3\u001b[0;31m     \u001b[0mresultado\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mnum1\u001b[0m \u001b[0;34m/\u001b[0m \u001b[0mnum2\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m      4\u001b[0m     \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mresultado\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
      "\u001b[0;31mZeroDivisionError\u001b[0m: division by zero"
     ]
    }
   ],
   "source": [
    "# Execução gerando erro por exceção\n",
    "numDiv(4,0)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Try, Except, Finally"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "ename": "TypeError",
     "evalue": "unsupported operand type(s) for +: 'int' and 'str'",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-6-963470595b1e>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0;36m8\u001b[0m \u001b[0;34m+\u001b[0m \u001b[0;34m's'\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[0;31mTypeError\u001b[0m: unsupported operand type(s) for +: 'int' and 'str'"
     ]
    }
   ],
   "source": [
    "8 + 's'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Operação não permitida\n"
     ]
    }
   ],
   "source": [
    "# Utilizando try e except\n",
    "try:\n",
    "    8 + 's'\n",
    "except TypeError:\n",
    "    print(\"Operação não permitida\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Conteúdo gravado com sucesso!\n"
     ]
    }
   ],
   "source": [
    "# Utilizando try, except e else\n",
    "try:\n",
    "    f = open('arquivos/testandoerros.txt','w')\n",
    "    f.write('Gravando no arquivo')\n",
    "except IOError:\n",
    "   print (\"Erro: arquivo não encontrado ou não pode ser salvo.\")\n",
    "else:\n",
    "   print (\"Conteúdo gravado com sucesso!\")\n",
    "   f.close()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Erro: arquivo não encontrado ou não pode ser lido.\n"
     ]
    }
   ],
   "source": [
    "# Utilizando try, except e else\n",
    "try:\n",
    "    f = open('arquivos/testandoerros','r')\n",
    "except IOError:\n",
    "   print (\"Erro: arquivo não encontrado ou não pode ser lido.\")\n",
    "else:\n",
    "   print (\"Conteúdo gravado com sucesso!\")\n",
    "   f.close()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Conteúdo gravado com sucesso!\n",
      "Comandos no bloco finally são sempre executados!\n"
     ]
    }
   ],
   "source": [
    "try:\n",
    "    f = open('arquivos/testandoerros.txt','w')\n",
    "    f.write('Gravando no arquivo')\n",
    "except IOError:\n",
    "   print (\"Erro: arquivo não encontrado ou não pode ser salvo.\")\n",
    "else:\n",
    "   print (\"Conteúdo gravado com sucesso!\")\n",
    "   f.close()\n",
    "finally:\n",
    "   print (\"Comandos no bloco finally são sempre executados!\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [],
   "source": [
    "def askint():\n",
    "        try:\n",
    "            val = int((input(\"Digite um número: \")))\n",
    "        except UnboundLocalError:\n",
    "            print (\"Você não digitou um número!\")\n",
    "        finally:\n",
    "            print (\"Obrigado!\")\n",
    "        print (val) "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Digite um número: 7\n",
      "Obrigado!\n",
      "7\n"
     ]
    }
   ],
   "source": [
    "askint()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [],
   "source": [
    "def askint():\n",
    "        try:\n",
    "            val = int(input(\"Digite um número: \"))\n",
    "        except:\n",
    "            print (\"Você não digitou um número!\")\n",
    "            val = int(input(\"Tente novamente. Digite um número: \"))\n",
    "        finally:\n",
    "            print (\"Obrigado!\")\n",
    "        print (val) "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Digite um número: 9\n",
      "Obrigado!\n",
      "9\n"
     ]
    }
   ],
   "source": [
    "askint()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [],
   "source": [
    "def askint():\n",
    "    while True:\n",
    "        try:\n",
    "            val = int(input(\"Digite um número: \"))\n",
    "        except:\n",
    "            print (\"Você não digitou um número!\")\n",
    "            continue\n",
    "        else:\n",
    "            print (\"Obrigado por digitar um número!\")\n",
    "            break\n",
    "        finally:\n",
    "            print(\"Fim da execução!\")\n",
    "        print (val) "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Digite um número: 8\n",
      "Obrigado por digitar um número!\n",
      "Fim da execução!\n"
     ]
    }
   ],
   "source": [
    "askint()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Erro:  'tuple' object has no attribute 'append'\n"
     ]
    }
   ],
   "source": [
    "tuple = (1,2,3,4,5)\n",
    "try:\n",
    "    tuple.append(6)\n",
    "    for each in tuple:\n",
    "        print(each)\n",
    "except AttributeError as e:\n",
    "    print('Erro: ', e)\n",
    "except IOError as e:\n",
    "    print('Erro de I/O:', e)"
   ]
  }
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