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sarincrsarincr
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Try error exceptions
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+362
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Diff for: ‎.ipynb_checkpoints/10.Exceptions-checkpoint.ipynb

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{
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"cells": [],
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"metadata": {},
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"cells": [
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{
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"cell_type": "code",
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"execution_count": 1,
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"metadata": {},
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"outputs": [],
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"source": [
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"import sys"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 2,
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"metadata": {},
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"outputs": [],
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"source": [
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"x = ['a', 0, 2]"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 3,
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"['a', 0, 2]"
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]
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},
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"execution_count": 3,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"x"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 4,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"The entry is a\n",
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"Oops! <class 'ValueError'> occured.\n",
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"Next entry.\n",
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"\n",
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"The entry is 0\n",
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"Oops! <class 'ZeroDivisionError'> occured.\n",
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"Next entry.\n",
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"\n",
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"The entry is 2\n",
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"The reciprocal of 2 is 0.5\n"
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]
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}
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],
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"source": [
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"for entry in x:\n",
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" try:\n",
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" print(\"The entry is\", entry)\n",
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" r = 1/int(entry)\n",
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" break\n",
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" except:\n",
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" print(\"Oops!\",sys.exc_info()[0],\"occured.\")\n",
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" print(\"Next entry.\")\n",
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" print()\n",
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"print(\"The reciprocal of\",entry,\"is\",r)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 5,
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"metadata": {},
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"outputs": [
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{
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"ename": "KeyboardInterrupt",
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"evalue": "",
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"output_type": "error",
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"traceback": [
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"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[0;31mKeyboardInterrupt\u001b[0m Traceback (most recent call last)",
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"\u001b[0;32m<ipython-input-5-c761920b81b0>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0;32mraise\u001b[0m \u001b[0mKeyboardInterrupt\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
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"\u001b[0;31mKeyboardInterrupt\u001b[0m: "
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]
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}
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],
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"source": [
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"raise KeyboardInterrupt"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 6,
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"metadata": {},
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"outputs": [
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{
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"ename": "MemoryError",
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"evalue": "This is an argument",
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"output_type": "error",
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"traceback": [
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"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[0;31mMemoryError\u001b[0m Traceback (most recent call last)",
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"\u001b[0;32m<ipython-input-6-51782e52f201>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0;32mraise\u001b[0m \u001b[0mMemoryError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"This is an argument\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
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"\u001b[0;31mMemoryError\u001b[0m: This is an argument"
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]
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}
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],
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"source": [
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"raise MemoryError(\"This is an argument\")"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 7,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Enter a positive integer: 3.0\n",
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"invalid literal for int() with base 10: '3.0'\n"
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]
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}
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],
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"source": [
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"try:\n",
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" a = int(input(\"Enter a positive integer: \"))\n",
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" if a <= 0:\n",
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" raise ValueError(\"That is not a positive number!\")\n",
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"except ValueError as ve:\n",
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" print(ve)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 8,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Enter a positive integer: 5\n"
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]
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}
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],
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"source": [
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"try:\n",
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" a = int(input(\"Enter a positive integer: \"))\n",
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" if a <= 0:\n",
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" raise ValueError(\"That is not a positive number!\")\n",
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"except ValueError as ve:\n",
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" print(ve)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 9,
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"metadata": {},
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"outputs": [],
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"source": [
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" try:\n",
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" f = open(\"test.txt\",encoding = 'utf-8')\n",
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" # perform file operations\n",
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" finally:\n",
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" f.close()"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 10,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Second element = 2\n",
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"An error occurred\n"
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]
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}
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],
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"source": [
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"a = [1, 2, 3] \n",
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"try:\n",
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" print(\"Second element = %d\" %(a[1]) )\n",
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" print(\"Fourth element = %d\" %(a[3]) )\n",
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"except IndexError: \n",
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" print(\"An error occurred\")\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 11,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"\n",
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"Error Occurred and Handled\n"
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]
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}
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],
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"source": [
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"try :\n",
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" a = 3\n",
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" if a < 4 : \n",
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" b = a/(a-3)\n",
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" print(\"Value of b = \", b )\n",
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"\n",
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"except(ZeroDivisionError, NameError):\n",
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" print(\"\\nError Occurred and Handled\")\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 12,
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"metadata": {},
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"outputs": [],
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"source": [
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"def funb(a , b): \n",
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" try:\n",
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" c = ((a+b) / (a-b)) \n",
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" except ZeroDivisionError:\n",
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" print(\"a/b result in 0\")\n",
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" else:\n",
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" print(c)\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 13,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"-5.0\n"
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]
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}
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],
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"source": [
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"funb(2.0, 3.0) "
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]
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},
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{
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"cell_type": "code",
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"execution_count": 14,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"a/b result in 0\n"
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]
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}
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],
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"source": [
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"funb(3.0, 3.0) "
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]
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},
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{
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"cell_type": "code",
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"execution_count": 15,
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"An exception\n"
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]
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},
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{
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"ename": "NameError",
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"evalue": "Hi there",
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"output_type": "error",
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"traceback": [
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"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[0;31mNameError\u001b[0m Traceback (most recent call last)",
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"\u001b[0;32m<ipython-input-15-d3e1cb263964>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m 1\u001b[0m \u001b[0;32mtry\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[0;32mraise\u001b[0m \u001b[0mNameError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"Hi there\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m 3\u001b[0m \u001b[0;32mexcept\u001b[0m \u001b[0mNameError\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 4\u001b[0m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"An exception\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 5\u001b[0m \u001b[0;32mraise\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
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"\u001b[0;31mNameError\u001b[0m: Hi there"
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]
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}
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],
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"source": [
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"try:\n",
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" raise NameError(\"Hi there\") \n",
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"except NameError:\n",
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" print(\"An exception\")\n",
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" raise"
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]
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.7.3"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 2
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}

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