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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 3: Simple Programs"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 1, Page number: 67"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Calculation and result\n",
+      "pi = 3.141\n",
+      "num = int(raw_input('Enter your favorite number: '))\n",
+      "print ('You have entered your favorite number as %d' % num)\n",
+      "c = raw_input('Enter your favorite character: ')\n",
+      "print ('You have entered your favorite character as %c' % c)\n",
+      "print ('The value of pi is %.3f ' % pi)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter your favorite number: 3\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "You have entered your favorite number as 3\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter your favorite character: m\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "You have entered your favorite character as m\n",
+        "The value of pi is 3.141 \n"
+       ]
+      }
+     ],
+     "prompt_number": 14
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.1, Page number: 70"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "a = int(raw_input('Enter first number '))\n",
+      "b = int(raw_input('Enter second number '))\n",
+      "\n",
+      "# Calculation\n",
+      "som = a+b\n",
+      "\n",
+      "# Result\n",
+      "print ('The sum of %d + %d = %d ' % (a, b, som))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter first number 67\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter second number 990\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The sum of 67 + 990 = 1057 \n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.2, Page number: 71"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "a = int(raw_input('Enter first number '))\n",
+      "b = int(raw_input('Enter second number '))\n",
+      "\n",
+      "# Calculation and result\n",
+      "if a>b :\n",
+      "   print ('The greater number is %d ' % a)\n",
+      "else :\n",
+      "   print ('The greater number is %d ' % b)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter first number 78\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter second number 190\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The greater number is 190 \n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.3, Page number: 72"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "a = int(raw_input('Enter first number '))\n",
+      "b = int(raw_input('Enter second number '))\n",
+      "\n",
+      "# Calculation and result\n",
+      "if a==b :\n",
+      "   print ('Both numbers are equal ')\n",
+      "else :\n",
+      "   if a>b :\n",
+      "      print ('The greater number is %d ' % a)\n",
+      "   else :\n",
+      "      print ('The greater number is %d ' % b)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter first number 78\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter second number 78\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Both numbers are equal \n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.4, Page number: 73"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "a = int(raw_input('Enter first number '))\n",
+      "b = int(raw_input('Enter second number '))\n",
+      "c = int(raw_input('Enter third number '))\n",
+      "\n",
+      "# Calculation and result\n",
+      "if a>b :\n",
+      "   if a>c :\n",
+      "      print ('The greatest number is %d ' % a)\n",
+      "   else :\n",
+      "      print ('The greatest number is %d ' % c)\n",
+      "\n",
+      "else :\n",
+      "   if b>c :\n",
+      "      print ('The greatest number is %d ' % b)\n",
+      "   else : \n",
+      "      print ('The greatest number is %d ' % c)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter first number 45\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter second number 128\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter third number 90\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The greatest number is 128 \n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.5, Page number: 74"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter any number '))\n",
+      "\n",
+      "# Calculation and result\n",
+      "print ('Counting upto %d ' % n)\n",
+      "\n",
+      "for i in range (1, n+1) :\n",
+      "   print ('%d ' % i),"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter any number 7\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Counting upto 7 \n",
+        "1  2  3  4  5  6  7 \n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.6, Page number: 75"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter any number '))\n",
+      "\n",
+      "# Calculation and result\n",
+      "print ('Even numbers upto %d ' % n)\n",
+      "\n",
+      "for i in range (2, n+1, 2) :\n",
+      "   print ('%d ' % i),"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter any number 10\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Even numbers upto 10 \n",
+        "2  4  6  8  10 \n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.7, Page number: 75"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter any number '))\n",
+      "\n",
+      "# Calculation and result\n",
+      "print ('Odd numbers upto %d ' % n)\n",
+      "\n",
+      "for i in range (1, n+1, 2) :\n",
+      "   print ('%d ' % i),"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter any number 10\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Odd numbers upto 10 \n",
+        "1  3  5  7  9 \n"
+       ]
+      }
+     ],
+     "prompt_number": 13
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.8, Page number: 76"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter any number '))\n",
+      "\n",
+      "# Calculation and result\n",
+      "print ('Number line upto %d ' % n)\n",
+      "\n",
+      "for i in range (-n, n+1) :\n",
+      "   print ('%d ' % i),"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter any number 7\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Number line upto 7 \n",
+        "-7  -6  -5  -4  -3  -2  -1  0  1  2  3  4  5  6  7 \n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.9, Page number: 77"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter any number '))\n",
+      "sum = 0\n",
+      "\n",
+      "# Calculation\n",
+      "for i in range (1, n+1) :\n",
+      "   sum = sum + i\n",
+      "\n",
+      "# Result\n",
+      "print ('Sum of %d natural numbers is %d ' % (n, sum))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter any number 6\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Sum of 6 natural numbers is 21 \n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.10, Page number: 78"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter any number '))\n",
+      "\n",
+      "# Calculation and result\n",
+      "print ('The factors of %d are ' % n)\n",
+      "\n",
+      "for i in range (1, n+1) :\n",
+      "   if n%i == 0 :\n",
+      "      print ('%d ' % i),"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter any number 28\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The factors of 28 are \n",
+        "1  2  4  7  14  28 \n"
+       ]
+      }
+     ],
+     "prompt_number": 7
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.11, Page number: 79"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter any number '))\n",
+      "\n",
+      "# Calculation and result\n",
+      "print ('The first 10 multiples of %d are ' % n)\n",
+      "\n",
+      "for i in range (1, 11) :\n",
+      "   print ('%d X %d = %d ' % (n, i, n*i))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter any number 6\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The first 10 multiples of 6 are \n",
+        "6 X 1 = 6 \n",
+        "6 X 2 = 12 \n",
+        "6 X 3 = 18 \n",
+        "6 X 4 = 24 \n",
+        "6 X 5 = 30 \n",
+        "6 X 6 = 36 \n",
+        "6 X 7 = 42 \n",
+        "6 X 8 = 48 \n",
+        "6 X 9 = 54 \n",
+        "6 X 10 = 60 \n"
+       ]
+      }
+     ],
+     "prompt_number": 8
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.12, Page number: 80"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter any number '))\n",
+      "i = 1\n",
+      "sum = 0\n",
+      "\n",
+      "# Calculation\n",
+      "print ('The sum of digits of %d is' % n),\n",
+      "\n",
+      "while n > 0 :\n",
+      "   sum = sum + n%10\n",
+      "   n = n/10\n",
+      "\n",
+      "# Result\n",
+      "print ('%d' % sum)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter any number 5214\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The sum of digits of 5214 is 12\n"
+       ]
+      }
+     ],
+     "prompt_number": 12
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.13, Page number: 81"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter any number '))\n",
+      "flag = 1\n",
+      "\n",
+      "# Calculation\n",
+      "for i in range (2, n) :\n",
+      "   if flag == 1 :\n",
+      "      if n%i == 0 :\n",
+      "         flag = 0\n",
+      "\n",
+      "# Result\n",
+      "if flag :\n",
+      "   print ('%d is Prime ' % n)\n",
+      "else :\n",
+      "   print ('%d is Composite ' % n)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter any number 41\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "41 is Prime \n"
+       ]
+      }
+     ],
+     "prompt_number": 10
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.14, Page number: 82"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter any number '))\n",
+      "first = 0\n",
+      "second = 1\n",
+      "count = 3\n",
+      "\n",
+      "# Calculation and result\n",
+      "print ('%d Fibonacci terms are ' % n)\n",
+      "print ('%d  %d ' % (first, second)),\n",
+      "\n",
+      "while count<=n :\n",
+      "   third = first + second\n",
+      "   first = second\n",
+      "   second = third\n",
+      "   print ('%d ' % third),\n",
+      "   count = count + 1"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter any number 10\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "10 Fibonacci terms are \n",
+        "0  1  1  2  3  5  8  13  21  34 \n"
+       ]
+      }
+     ],
+     "prompt_number": 14
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.15, Page number: 83"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter any number '))\n",
+      "sum = n\n",
+      "\n",
+      "# Calculation\n",
+      "print ('Sum of digits of %d is' % n),\n",
+      "\n",
+      "while sum>=10 :\n",
+      "   sum = 0\n",
+      "   while n>0 :\n",
+      "      sum = sum + n%10\n",
+      "      n = n/10\n",
+      "   n = sum\n",
+      "\n",
+      "# Result\n",
+      "print ('%d' % sum)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter any number 8626\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Sum of digits of 8626 is 4\n"
+       ]
+      }
+     ],
+     "prompt_number": 15
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.16, Page number: 84"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter any number '))\n",
+      "\n",
+      "# Calculation and result\n",
+      "print ('Prime numbers upto %d are ' % n)\n",
+      "\n",
+      "for num in range (2, n+1) :\n",
+      "   flag = 1\n",
+      "   for i in range (2, num) :\n",
+      "      if num % i == 0 : \n",
+      "         flag = 0\n",
+      "   if flag :\n",
+      "      print ('%d ' % num),"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter any number 12\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Prime numbers upto 12 are \n",
+        "2  3  5  7  11 \n"
+       ]
+      }
+     ],
+     "prompt_number": 16
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.17, Page number: 85"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter a number '))\n",
+      "\n",
+      "# Calculation and result\n",
+      "for lin in range (1, n+1) :\n",
+      "   for count in range (1, lin+1) :\n",
+      "      print ('%d ' % count),\n",
+      "   print"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a number 6\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "1 \n",
+        "1  2 \n",
+        "1  2  3 \n",
+        "1  2  3  4 \n",
+        "1  2  3  4  5 \n",
+        "1  2  3  4  5  6 \n"
+       ]
+      }
+     ],
+     "prompt_number": 17
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.18, Page number: 86"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter a number '))\n",
+      "\n",
+      "# Calculation and result\n",
+      "for lin in range (1, n+1) :\n",
+      "   for count in range (lin, 2*lin) :\n",
+      "      print ('%d ' % count),\n",
+      "   print"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a number 6\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "1 \n",
+        "2  3 \n",
+        "3  4  5 \n",
+        "4  5  6  7 \n",
+        "5  6  7  8  9 \n",
+        "6  7  8  9  10  11 \n"
+       ]
+      }
+     ],
+     "prompt_number": 18
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.19, Page number: 87"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter a number '))\n",
+      "\n",
+      "# Calculation and result\n",
+      "for lin in range (1, n+1) :\n",
+      "   for blk in range (1, n-lin+1) :\n",
+      "      print ' ',\n",
+      "   for up in range (1, lin+1) :\n",
+      "      print ('%d' % up),\n",
+      "   down = lin-1\n",
+      "   while down>0 :\n",
+      "      print ('%d' % down),\n",
+      "      down = down-1\n",
+      "   print"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a number 6\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "          1\n",
+        "        1 2 1\n",
+        "      1 2 3 2 1\n",
+        "    1 2 3 4 3 2 1\n",
+        "  1 2 3 4 5 4 3 2 1\n",
+        "1 2 3 4 5 6 5 4 3 2 1\n"
+       ]
+      }
+     ],
+     "prompt_number": 19
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 3.20, Page number: 88"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter a number '))\n",
+      "\n",
+      "# Calculation and result\n",
+      "for lin in range (1, n+1) :\n",
+      "   for blk in range (1, n-lin+1) :\n",
+      "      print ' ',\n",
+      "   for up in range (lin, 2*lin) :\n",
+      "      print ('%d' % (up%10)),\n",
+      "   down = 2*lin-2\n",
+      "   while down>=lin :\n",
+      "      print ('%d' % (down%10)),\n",
+      "      down = down-1\n",
+      "   print"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a number 6\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "          1\n",
+        "        2 3 2\n",
+        "      3 4 5 4 3\n",
+        "    4 5 6 7 6 5 4\n",
+        "  5 6 7 8 9 8 7 6 5\n",
+        "6 7 8 9 0 1 0 9 8 7 6\n"
+       ]
+      }
+     ],
+     "prompt_number": 20
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
\ No newline at end of file