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@@ -0,0 +1,1070 @@
+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 4: Functions"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.1, Page number: 91"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Function declaration and result\n",
+      "a = 5\n",
+      "c = 'h'\n",
+      "b = 3.14\n",
+      "def myfunction (x, ch, fl) :\n",
+      "    print ('%d %c %.2f ' % (x, ch, fl))\n",
+      "    \n",
+      "myfunction (a, c, b)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "5 h 3.14 \n"
+       ]
+      }
+     ],
+     "prompt_number": 21
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.2, Page number: 92"
+     ]
+    },
+    {
+     "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",
+      "# Function declaration, calculation and result\n",
+      "def add (a, b) :\n",
+      "   som = a + b\n",
+      "   return som\n",
+      "\n",
+      "print ('The sum of %d and %d is %d' % (a, b, (add (a, b))))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter first number: 7\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter second number: 8\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The sum of 7 and 8 is 15\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.3, Page number: 99"
+     ]
+    },
+    {
+     "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",
+      "# Function declaration, calculation and result\n",
+      "def greater (a, b) :\n",
+      "   if a > b :\n",
+      "      return a\n",
+      "   else :\n",
+      "      return b\n",
+      "\n",
+      "print ('The greater number is %d' % (greater (a, 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": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.4, Page number: 100"
+     ]
+    },
+    {
+     "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",
+      "# Function declaration, calculation and result\n",
+      "def greater (a, b) :\n",
+      "   if a == b :\n",
+      "      print ('Both numbers are equal')\n",
+      "   elif a > b :\n",
+      "      print ('The greater number is %d' % a)\n",
+      "   else :\n",
+      "      print ('The greater number is %d' % b)\n",
+      "   return\n",
+      "\n",
+      "greater (a, b)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter first number: 20\n"
+       ]
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter second number: 20\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Both numbers are equal\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.5, Page number: 102"
+     ]
+    },
+    {
+     "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",
+      "# Function declaration, calculation and result\n",
+      "def greatest (a, b, c) :\n",
+      "   if a > b :\n",
+      "      if a > c :\n",
+      "         return a\n",
+      "      else :\n",
+      "         return c\n",
+      "   else :\n",
+      "      if b > c :\n",
+      "         return b\n",
+      "      else :\n",
+      "         return c\n",
+      "\n",
+      "print ('The greatest number is %d' % (greatest (a, b, 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: 190\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The greatest number is 190\n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.6, Page number: 104"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter a number: '))\n",
+      "\n",
+      "# Function declaration, calculation and result\n",
+      "def printnum (n) :\n",
+      "   print ('Counting upto %d' % n)   \n",
+      "   for i in range (1, n+1) :\n",
+      "      print i,\n",
+      "\n",
+      "printnum (n)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a number: 7\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Counting upto 7\n",
+        "1 2 3 4 5 6 7\n"
+       ]
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.7, Page number: 105"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter a number: '))\n",
+      "\n",
+      "# Function declaration, calculation and result\n",
+      "def printeven (n) :\n",
+      "   print ('Even numbers upto %d' % n)   \n",
+      "   for i in range (2, n+1, 2) :\n",
+      "      print i,\n",
+      "\n",
+      "printeven (n)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a number: 7\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Even numbers upto 7\n",
+        "2 4 6\n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.8, Page number: 107"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter a number: '))\n",
+      "\n",
+      "# Function declaration, calculation and result\n",
+      "def printodd (n) :\n",
+      "   print ('Odd numbers upto %d' % n)   \n",
+      "   for i in range (1, n+1, 2) :\n",
+      "      print i,\n",
+      "\n",
+      "printodd (n)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a number: 7\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Odd numbers upto 7\n",
+        "1 3 5 7\n"
+       ]
+      }
+     ],
+     "prompt_number": 7
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.9, Page number: 108"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter a number: '))\n",
+      "\n",
+      "# Function declaration, calculation and result\n",
+      "def printnum (n) :\n",
+      "   print ('Number line for %d' % n)   \n",
+      "   for i in range (-n, n+1) :\n",
+      "      print i,\n",
+      "\n",
+      "printnum (n)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a number: 4\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Number line for 4\n",
+        "-4 -3 -2 -1 0 1 2 3 4\n"
+       ]
+      }
+     ],
+     "prompt_number": 8
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.10, Page number: 110"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter a number: '))\n",
+      "\n",
+      "# Function declaration, calculation and result\n",
+      "def summate (n) :\n",
+      "   total = 0\n",
+      "   for i in range (1, n+1) :\n",
+      "      total = total + i\n",
+      "   return total\n",
+      "\n",
+      "print('Sum of first %d natural numbers is %d' % (n, summate (n)))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a number: 6\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Sum of first 6 natural numbers is 21\n"
+       ]
+      }
+     ],
+     "prompt_number": 9
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.11, Page number: 111"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter a number: '))\n",
+      "\n",
+      "# Function declaration, calculation and result\n",
+      "def factors (n) :\n",
+      "   print ('The factors of %d are' % n)\n",
+      "   for i in range (1, n+1) :\n",
+      "      if n%i == 0 :\n",
+      "         print i,\n",
+      "\n",
+      "factors (n)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a number: 28\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The factors of 28 are\n",
+        "1 2 4 7 14 28\n"
+       ]
+      }
+     ],
+     "prompt_number": 10
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.12, Page number: 113"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter a number: '))\n",
+      "\n",
+      "# Function declaration, calculation and result\n",
+      "def multiple (n) :\n",
+      "   print ('The first 10 multiples of %d are' % n)\n",
+      "   for i in range (1, 11) :\n",
+      "         print('%d X %d = %d' % (n, i, n*i))\n",
+      "\n",
+      "multiple (n)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a 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": 11
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.13, Page number: 114"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter a number: '))\n",
+      "\n",
+      "# Function declaration, calculation and result\n",
+      "def sumofdigit (n) :\n",
+      "   sum = 0\n",
+      "   while n>0 :\n",
+      "      sum = sum + n%10\n",
+      "      n = n/10\n",
+      "   return sum\n",
+      "\n",
+      "print ('The sum of digits of %d is %d' % (n, sumofdigit (n)))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a 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 4.14, Page number: 116"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter a number: '))\n",
+      "\n",
+      "# Function declaration, calculation and result\n",
+      "def prime (n) :\n",
+      "   count = 0\n",
+      "   for i in range (2, n) :\n",
+      "      if n%i == 0 :\n",
+      "         count = count + 1\n",
+      "         break\n",
+      "\n",
+      "   if count == 0 :\n",
+      "      print ('The number %d is prime' % n)\n",
+      "   else :\n",
+      "      print ('The number %d is composite' % n)\n",
+      "\n",
+      "prime (n)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a number: 14\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The number 14 is composite\n"
+       ]
+      }
+     ],
+     "prompt_number": 13
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.15, Page number: 118"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter a number: '))\n",
+      "\n",
+      "# Function declaration, calculation and result\n",
+      "print ('%d terms of Fibonacci series are ' % n)\n",
+      "\n",
+      "def printfibo (n) :\n",
+      "   first = 0\n",
+      "   second = 1\n",
+      "   count = 3\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\n",
+      "\n",
+      "printfibo (n)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a number: 10\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "10 terms of Fibonacci series are \n",
+        "0  1   1   2   3   5   8   13   21   34 \n"
+       ]
+      }
+     ],
+     "prompt_number": 15
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.16, Page number: 120"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter a number: '))\n",
+      "\n",
+      "# Function declaration, calculation and result\n",
+      "def sumofdigit (n) :\n",
+      "   sum = 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",
+      "   return sum\n",
+      "\n",
+      "print ('Sum of digits of %d is %d' % (n, sumofdigit (n)))"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a number: 8626\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Sum of digits of 8626 is 4\n"
+       ]
+      }
+     ],
+     "prompt_number": 16
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.17, Page number: 122"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter a number: '))\n",
+      "\n",
+      "# Function declaration, calculation and result\n",
+      "print ('Prime numbers upto %d are ' % n)\n",
+      "\n",
+      "def printprime (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),\n",
+      "\n",
+      "printprime (n)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a number: 40\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Prime numbers upto 40 are \n",
+        "2  3  5  7  11  13  17  19  23  29  31  37 \n"
+       ]
+      }
+     ],
+     "prompt_number": 18
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.18, Page number: 124"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter a number: '))\n",
+      "\n",
+      "# Function declaration, calculation and result\n",
+      "def pattern (n) :\n",
+      "   for lin in range (1, n+1) :\n",
+      "      for count in range (1, lin+1) :\n",
+      "         print ('%d ' % count),\n",
+      "      print\n",
+      "\n",
+      "pattern (n)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a number: 4\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "1 \n",
+        "1  2 \n",
+        "1  2  3 \n",
+        "1  2  3  4 \n"
+       ]
+      }
+     ],
+     "prompt_number": 20
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.19, Page number: 126"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter a number: '))\n",
+      "\n",
+      "# Function declaration, calculation and result\n",
+      "def pattern (n) :\n",
+      "   for lin in range (1, n+1) :\n",
+      "      for count in range (lin, 2*lin) :\n",
+      "         print ('%d ' % count),\n",
+      "      print\n",
+      "\n",
+      "pattern (n)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a number: 4\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "1 \n",
+        "2  3 \n",
+        "3  4  5 \n",
+        "4  5  6  7 \n"
+       ]
+      }
+     ],
+     "prompt_number": 21
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.20, Page number: 128"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter a number: '))\n",
+      "\n",
+      "# Function declaration, calculation and result\n",
+      "def pattern (n) :\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\n",
+      "\n",
+      "pattern (n)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a number: 4\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"
+       ]
+      }
+     ],
+     "prompt_number": 23
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 4.21, Page number: 131"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "# Variable declaration\n",
+      "n = int(raw_input('Enter a number: '))\n",
+      "\n",
+      "# Function declaration, calculation and result\n",
+      "def pattern (n) :\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\n",
+      "\n",
+      "pattern (n)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter a number: 4\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"
+       ]
+      }
+     ],
+     "prompt_number": 24
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
\ No newline at end of file