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+{
+ "metadata": {
+ "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chapter 4: Loops"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 4.1, page no. 139"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\"\"\"\n",
+ "List ten integers\n",
+ "\"\"\"\n",
+ "\n",
+ "for count in range (1, 11):\n",
+ " print count,\n",
+ "print \"\\nAfter the loop count has the value %d.\" %count"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "1 2 3 4 5 6 7 8 9 10 \n",
+ "After the loop count has the value 10.\n"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 4.2, page no. 140"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\"\"\"\n",
+ "Drawing a box\n",
+ "\"\"\"\n",
+ "\n",
+ "print \"**************\"\n",
+ "for count in range(1, 9):\n",
+ " print \"* *\"\n",
+ "print \"**************\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "**************\n",
+ "* *\n",
+ "* *\n",
+ "* *\n",
+ "* *\n",
+ "* *\n",
+ "* *\n",
+ "* *\n",
+ "* *\n",
+ "**************\n"
+ ]
+ }
+ ],
+ "prompt_number": 2
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 4.3, page no. 144"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\"\"\"\n",
+ "Sum the integers from 1 to a user-specified number\n",
+ "\"\"\"\n",
+ "\n",
+ "sum = 0\n",
+ "\n",
+ "print \"Enter the number of integers you want to sum: \",\n",
+ "count = int(raw_input())\n",
+ " \n",
+ "for i in range(1, count+1):\n",
+ " sum = sum + i\n",
+ " \n",
+ "print \"Total of the first %d numbers is %d\" %(count, sum)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter the number of integers you want to sum: "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "10\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " Total of the first 10 numbers is 55\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 4.4, page no. 144"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\"\"\"\n",
+ "Sum the integers from 1 to a user-specified number (compact version)\n",
+ "note: the way specified in book is not possible in Python, it will be same as\n",
+ "previous progam\n",
+ "\"\"\"\n",
+ "\n",
+ "sum = 0\n",
+ "\n",
+ "print \"Enter the number of integers you want to sum: \",\n",
+ "count = int(raw_input())\n",
+ " \n",
+ "for i in range(1, count+1):\n",
+ " sum = sum + i\n",
+ " \n",
+ "print \"Total of the first %d numbers is %d\" %(count, sum)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter the number of integers you want to sum: "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "10\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " Total of the first 10 numbers is 55\n"
+ ]
+ }
+ ],
+ "prompt_number": 5
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 4.5, page no. 147"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\"\"\"\n",
+ "summing the integers backward\n",
+ "\"\"\"\n",
+ "\n",
+ "sum = 0\n",
+ "\n",
+ "print \"Enter the number of integers you want to sum: \",\n",
+ "count = int(raw_input())\n",
+ "for i in range(count, 0, -1):\n",
+ " sum = sum + i\n",
+ "print \"Total of the first %d numbers is %d\" %(count, sum)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter the number of integers you want to sum: "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "10\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " Total of the first 10 numbers is 55\n"
+ ]
+ }
+ ],
+ "prompt_number": 6
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 4.6, page no. 148"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\"\"\"\n",
+ "The almost indefinite loop - computing an average\n",
+ "note: there cannot be infinit for loop in python, we will use while loop\n",
+ "\"\"\"\n",
+ "\n",
+ "print \"This program calculates the average of any number of values.\"\n",
+ "total = 0\n",
+ "count = 0\n",
+ "while True: # infinite loop\n",
+ " print \"\\nEnter a value: \",\n",
+ " value = float(raw_input())\n",
+ " total += value\n",
+ " count += 1\n",
+ " \n",
+ " print \"Do you want to enter another value? (Y or N): \", \n",
+ " answer = raw_input()\n",
+ " if(answer.lower() == 'n'):\n",
+ " break\n",
+ "\n",
+ "print \"The average is %.2f\" %(total/count)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "This program calculates the average of any number of values.\n",
+ "\n",
+ "Enter a value: "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "10\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " Do you want to enter another value? (Y or N): "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "y\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " \n",
+ "Enter a value: "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "8\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " Do you want to enter another value? (Y or N): "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "y\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " \n",
+ "Enter a value: "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "6\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " Do you want to enter another value? (Y or N): "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "n\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " The average is 8.00\n"
+ ]
+ }
+ ],
+ "prompt_number": 7
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 4.7, page no. 151"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\"\"\"\n",
+ "A Guessing Game\n",
+ "\"\"\"\n",
+ "import sys\n",
+ "\n",
+ "chosen = 15\n",
+ "guess = 0\n",
+ "count = 3\n",
+ " \n",
+ "print \"This is a guessing game.\"\n",
+ "print \"I have chosen a number between 1 and 20 which you must guess.\"\n",
+ "\n",
+ "for i in range(count, 0, -1):\n",
+ " print \"You have %d tr%s left.\" %(i, (\"y\" if i == 1 else \"ies\"));\n",
+ " print \"\\nEnter a guess: \",\n",
+ " guess = int(raw_input())\n",
+ " if(guess == chosen):\n",
+ " print \"Congratulations. You guessed it!\"\n",
+ " sys.exit()\n",
+ " elif(guess < 1 or guess > 20):\n",
+ " print \"I said the number is between 1 and 20.\"\n",
+ " else:\n",
+ " print \"Sorry, %d is wrong. My number is %s than that.\\n\" %(guess, (\"greater\" if chosen > guess else \"less\"))\n",
+ "print \"You have had three tries and failed. The number was %d\" % chosen"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "This is a guessing game.\n",
+ "I have chosen a number between 1 and 20 which you must guess.\n",
+ "You have 3 tries left.\n",
+ "\n",
+ "Enter a guess: "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "5\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " Sorry, 5 is wrong. My number is greater than that.\n",
+ "\n",
+ "You have 2 tries left.\n",
+ "\n",
+ "Enter a guess: "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "9\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " Sorry, 9 is wrong. My number is greater than that.\n",
+ "\n",
+ "You have 1 try left.\n",
+ "\n",
+ "Enter a guess: "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "14\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " Sorry, 14 is wrong. My number is greater than that.\n",
+ "\n",
+ "You have had three tries and failed. The number was 15\n"
+ ]
+ }
+ ],
+ "prompt_number": 8
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 4.7A, page no. 154"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\"\"\"\n",
+ "A More Interesting Guessing Game\n",
+ "\"\"\"\n",
+ "\n",
+ "from random import *\n",
+ "\n",
+ "guess = 0\n",
+ "count = 3\n",
+ "limit = 20\n",
+ "\n",
+ "chosen = 1 + randint(1, limit) #Random int 1 to limit\n",
+ " \n",
+ "print \"This is a guessing game.\"\n",
+ "print \"I have chosen a number between 1 and 20 which you must guess.\"\n",
+ "\n",
+ "for i in range(count, 0, -1):\n",
+ " print \"You have %d tr%s left.\" %(i, (\"y\" if i == 1 else \"ies\"));\n",
+ " print \"Enter a guess: \",\n",
+ " guess = int(raw_input())\n",
+ " if(guess == chosen):\n",
+ " print \"Congratulations. You guessed it!\"\n",
+ " sys.exit()\n",
+ " elif(guess < 1 or guess > 20):\n",
+ " print \"I said the number is between 1 and 20.\"\n",
+ " else:\n",
+ " print \"Sorry, %d is wrong. My number is %s than that.\\n\" %(guess, (\"greater\" if chosen > guess else \"less\"))\n",
+ "print \"You have had three tries and failed. The number was %d\" % chosen"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "This is a guessing game.\n",
+ "I have chosen a number between 1 and 20 which you must guess.\n",
+ "You have 3 tries left.\n",
+ "Enter a guess: "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "6\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " Sorry, 6 is wrong. My number is greater than that.\n",
+ "\n",
+ "You have 2 tries left.\n",
+ "Enter a guess: "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "14\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " Sorry, 14 is wrong. My number is greater than that.\n",
+ "\n",
+ "You have 1 try left.\n",
+ "Enter a guess: "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "16\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " Sorry, 16 is wrong. My number is greater than that.\n",
+ "\n",
+ "You have had three tries and failed. The number was 20\n"
+ ]
+ }
+ ],
+ "prompt_number": 11
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 4.8, page no. 158"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\"\"\"\n",
+ "While programming and summing integers\n",
+ "\"\"\"\n",
+ "\n",
+ "sum = 0\n",
+ "i = 1\n",
+ "\n",
+ "print \"Enter the number of integers you want to sum: \",\n",
+ "count = int(raw_input())\n",
+ " \n",
+ "while(i <= count):\n",
+ " sum += i\n",
+ " i += 1\n",
+ " \n",
+ "print \"Total of the first %d numbers is %d\" %(count, sum)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter the number of integers you want to sum: "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "10\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " Total of the first 10 numbers is 55\n"
+ ]
+ }
+ ],
+ "prompt_number": 9
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 4.9, page no. 161"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\"\"\"\n",
+ "Output a box with given width and height\n",
+ "\"\"\"\n",
+ "\n",
+ "MIN_SIZE = 3;\n",
+ " \n",
+ "print \"Enter values for the width and height (minimum of %d): \" % MIN_SIZE\n",
+ "width = int(raw_input(\"Width: \"))\n",
+ "height = int(raw_input(\"Height: \"))\n",
+ " \n",
+ "if(width < MIN_SIZE):\n",
+ " print \"Width value of %d is too small. Setting it to %d.\" %(width, MIN_SIZE)\n",
+ " width = MIN_SIZE\n",
+ "if(height < MIN_SIZE):\n",
+ " print \"Height value of %d is too small. Setting it to %d.\" %(height, MIN_SIZE)\n",
+ " height = MIN_SIZE\n",
+ "\n",
+ "\n",
+ "for i in range(0, width):\n",
+ " print \"*\",\n",
+ "print \"\\n\"\n",
+ "for j in range(0, height-2):\n",
+ " print \"*\",\n",
+ " for i in range(0, width-2):\n",
+ " print \" \",\n",
+ " print \"*\"\n",
+ "\n",
+ "print \"\\n\"\n",
+ "for i in range(0, width):\n",
+ " print \"*\","
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter values for the width and height (minimum of 3): \n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Width: 24\n"
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Height: 7\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "* * * * * * * * * * * * * * * * * * * * * * * * \n",
+ "\n",
+ "* *\n",
+ "* *\n",
+ "* *\n",
+ "* *\n",
+ "* *\n",
+ "\n",
+ "\n",
+ "* * * * * * * * * * * * * * * * * * * * * * * *\n"
+ ]
+ }
+ ],
+ "prompt_number": 17
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 4.10, page no. 162"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\"\"\"\n",
+ "Sums of successive integer sequences\n",
+ "\"\"\"\n",
+ "\n",
+ "sum = 0\n",
+ "count = 0\n",
+ "\n",
+ "print \"Enter the number of integers you want to sum: \",\n",
+ "count = int(raw_input())\n",
+ " \n",
+ "for i in range(1, count+1):\n",
+ " sum = 0\n",
+ " for j in range(1, i+1):\n",
+ " sum += j\n",
+ " print \"%d\\t%5d\" %(i, sum)\n",
+ "print \"\\n\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter the number of integers you want to sum: "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "10\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " 1\t 1\n",
+ "2\t 3\n",
+ "3\t 6\n",
+ "4\t 10\n",
+ "5\t 15\n",
+ "6\t 21\n",
+ "7\t 28\n",
+ "8\t 36\n",
+ "9\t 45\n",
+ "10\t 55\n",
+ "\n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 18
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 4.11, page no. 164"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\"\"\"\n",
+ "Sums of integers with a while loop nested in a for loop\n",
+ "\"\"\"\n",
+ "\n",
+ "print \"Enter the number of integers you want to sum: \",\n",
+ "count = int(raw_input())\n",
+ "\n",
+ "for i in range(1, count+1):\n",
+ " sum = 1\n",
+ " j = 1\n",
+ " print \"1\",\n",
+ " while(j < i):\n",
+ " j += 1\n",
+ " sum += j\n",
+ " print \"+ %d\" % j,\n",
+ " print \"= %d\" % sum\n",
+ "print \"\\n\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Enter the number of integers you want to sum: "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "10\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " 1 = 1\n",
+ "1 + 2 = 3\n",
+ "1 + 2 + 3 = 6\n",
+ "1 + 2 + 3 + 4 = 10\n",
+ "1 + 2 + 3 + 4 + 5 = 15\n",
+ "1 + 2 + 3 + 4 + 5 + 6 = 21\n",
+ "1 + 2 + 3 + 4 + 5 + 6 + 7 = 28\n",
+ "1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 = 36\n",
+ "1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45\n",
+ "1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55\n",
+ "\n",
+ "\n"
+ ]
+ }
+ ],
+ "prompt_number": 19
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Program 4.12, page no. 167"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\"\"\"\n",
+ "Reversing the digits\n",
+ "\"\"\"\n",
+ "rebmun = 0\n",
+ "print \"\\nEnter a positive integer: \",\n",
+ "number = int(raw_input())\n",
+ "temp = number\n",
+ "while(temp):\n",
+ " rebmun = 10*rebmun + temp % 10\n",
+ " temp = temp/10\n",
+ "\n",
+ "print \"The number %d reversed is %d rebmun ehT\" %(number, rebmun)"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "\n",
+ "Enter a positive integer: "
+ ]
+ },
+ {
+ "name": "stdout",
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "7\n"
+ ]
+ },
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ " The number 7 reversed is 7 rebmun ehT\n"
+ ]
+ }
+ ],
+ "prompt_number": 20
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+} \ No newline at end of file