{
"metadata": {
"name": "",
"signature": "sha256:f41d93d043c68dcb6af847a40af38d47fc3a3d45c60675afb574707e38d804d9"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h1>Chapter 5: Arrays ans Strings<h1>"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 5.1, Page Number: 82<h3>\n",
" "
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"#Variable declaration\n",
"sample = range(10) #Declares an array [0,1,2,3,4,5,6,7,8,9]\n",
"\n",
"#Displays the array\n",
"for t in range(10):\n",
" print sample[t],\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"0 1 2 3 4 5 6 7 8 9\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 5.2, Page Number: 83<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"import random\n",
"\n",
"#Variable declaration\n",
"list = [] #List of integers\n",
"\n",
"for i in range(10):\n",
" list.append(random.randint(0,1000)) #randomely assigning integers\n",
" \n",
"#Finding the minimum value\n",
"min_value = list[0]\n",
"\n",
"for i in range(10):\n",
" if min_value>list[i]:\n",
" min_value=list[i]\n",
"print \"minimum value: \",min_value #Result:Minimum value\n",
"\n",
"#Finding maximum value\n",
"max_value = list[0]\n",
"\n",
"for i in range(10):\n",
" if max_value<list[i]:\n",
" max_value=list[i]\n",
"print \"maximum value: \",max_value #Result:Maximum value\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"minimum value: 192\n",
"maximum value: 684\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 5.3, Page Number: 85<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"\n",
"import random\n",
"\n",
"#Variable declaration\n",
"nums = []\n",
"size = 10\n",
"\n",
"#Initializing list with random numbers\n",
"for t in range(size):\n",
" nums.append(random.randint(0,1000))\n",
"\n",
"#Displays original array\n",
"print \"Original array is: \"\n",
"print nums\n",
"\n",
"#Bubble Sort\n",
"for a in range(size):\n",
" for b in xrange(size-1,a,-1):\n",
" if nums[b-1]>nums[b]:\n",
" t=nums[b-1]\n",
" nums[b-1]=nums[b]\n",
" nums[b] = t\n",
"\n",
"#Display sorted array\n",
"print \"Sorted array is: \"\n",
"print nums\n",
"\n",
" \n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Original array is: \n",
"[388, 661, 218, 595, 167, 46, 704, 140, 559, 428]\n",
"Sorted array is: \n",
"[46, 140, 167, 218, 388, 428, 559, 595, 661, 704]\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 5.4, Page Number: 87<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"#Variable decleration\n",
"str = \"Hello\"\n",
"\n",
"#Result\n",
"print \"Here is your string:\",\n",
"print str\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Here is your string: Hello\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 5.5, Page Number: 88<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"\n",
"print \"Enter a string: \"\n",
"\n",
" \n",
"str = \"Hello\"\n",
"\n",
"#Result\n",
"print \"Here is your string:\",\n",
"print str\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter a string: \n",
"Here is your string: Hello\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 5.6, Page Number: 89<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"#Variable decleration\n",
"s=str\n",
"str = s #copying s into str\n",
"\n",
"#Result\n",
"print str\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Hello\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 5.7, Page Number: 89<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"#Variable decleration\n",
"s1 = \"Hello\"\n",
"s2 = \" There\"\n",
"\n",
"#Concatenation\n",
"s1+=s2\n",
"\n",
"#Result\n",
"print s1\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Hello There\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 5.8, Page Number: 90<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"def password():\n",
" print \"Enter password: \" #User input for password\n",
" s= \"pass\"\n",
" if s==\"password\":\n",
" return True\n",
" else:\n",
" print \"Invalid password.\"\n",
" return False\n",
"\n",
"#Result\n",
"if password() :\n",
" print \"Logged On.\"\n",
"else:\n",
" print \"Access denied\"\n",
" \n",
" \n",
" \n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter password: \n",
"Invalid password.\n",
"Access denied\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 5.9, Page Number: 91<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import string\n",
"\n",
" s=raw_input(\"Enter a string: \") #User input of string;\n",
" if s==\"quit\": #Sting comparison\n",
" break\n",
" \n",
" \n",
"\n",
" \n",
" \n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter a string: ddc\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter a string: hello\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter a string: quit\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 5.10, Page Number: 91<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"#Variable declaration\n",
"str = \"Hello\"\n",
"\n",
"#Result\n",
"print \"Length is: \",len(str)\n",
" \n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Length is: 5\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 5.11, Page Number: 92<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"str = \"Hello World\"\n",
"\n",
"#Reversing a String\n",
"rev = str[::-1]\n",
"\n",
"#Result\n",
"print rev\n",
"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"dlroW olleH\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 5.12, Page Number: 92<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"s1 = \"Hello\"\n",
"s2 = \"there\"\n",
"\n",
"#Printing lengths\n",
"print \"lengths: \",len(s1),' ',len(s2)\n",
"\n",
"#Comparing\n",
"if(s1==s2):\n",
" print \"The strings are equal\"\n",
"else:\n",
" print \"not equal\"\n",
"\n",
"#Concatenation\n",
"s1+=s2\n",
"print s1\n",
"\n",
"\n",
"#Copying\n",
"s1=s2\n",
"\n",
"#Result\n",
"print s1,\"and\",s2,\" are now the same\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"lengths: 5 5\n",
"not equal\n",
"Hellothere\n",
"there and there are now the same\n"
]
}
],
"prompt_number": 9
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 5.13, Page Number: 93<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"import string\n",
"\n",
"#Variable Initialization\n",
"str= \"this is a test\"\n",
"\n",
"str=string.upper(str)\n",
"\n",
"#Result\n",
"print str\n",
" "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"THIS IS A TEST\n"
]
}
],
"prompt_number": 12
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 5.14, Page Number: 94<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"arr=[] #The 2-D list\n",
"new=[] #The nested list\n",
"\n",
"#Initializing the 2-D array\n",
"for i in range(3):\n",
" new=[]\n",
" for j in range(4):\n",
" new.append(i*4+j+1)\n",
" arr.append(new)\n",
"\n",
"#Result\n",
"for i in range(3):\n",
" for j in range(4):\n",
" print arr[i][j],\n",
" print"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"1 2 3 4\n",
"5 6 7 8\n",
"9 10 11 12\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 5.15, Page Number: 98<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"#Variabe Initialzation\n",
"sqrs= [[1,1],[2,4],[3,9],[4,16],[5,25],\n",
" [6,36],[7,49],[8,64],[9,81],[10,100]] #Array storing the squares\n",
"i=6 #User input of number whose square is to be looked up\n",
"\n",
"#Search for the number\n",
"for j in range(10):\n",
" if sqrs[j][0]==i:\n",
" break\n",
" \n",
"#Result\n",
"print \"The square of \",i,\" is \", sqrs[j][1]"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The square of 6 is 36\n"
]
}
],
"prompt_number": 15
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 5.16, Page Number: 99<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"def f1():\n",
" s=\"this is a test\" #initial s\n",
" print s\n",
" s=\"CHANGED\" #s is now changed \n",
" print s\n",
"\n",
"#Calling the function twice\n",
"f1()\n",
"f1()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"this is a test\n",
"CHANGED\n",
"this is a test\n",
"CHANGED\n"
]
}
],
"prompt_number": 17
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 5.17, Page Number: 101<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"#Variable decleration\n",
"text=[]\n",
"str=['eat','play','work'] #user input of strings\n",
"p=len(str)\n",
"\n",
"for t in range(p):\n",
" print t,\":\"\n",
" text.append(str[t]) #Here, user input taken from the list\n",
" \n",
"#Result; redisplay the strings\n",
"for i in range(p):\n",
" print text[i]\n",
" "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"0 :\n",
"1 :\n",
"2 :\n",
"eat\n",
"play\n",
"work\n"
]
}
],
"prompt_number": 18
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 5.18, Page Number: 103<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"import random \n",
"\n",
"#Variable decleration\n",
"name=[] #this list holds employee names\n",
"wage=[] #their phone numbers\n",
"phone=[] #hours worked per week\n",
"hours=[] #wage\n",
"num=0 #User choice\n",
"\n",
"#Menu \n",
"def menu():\n",
" global num #All options are chosen one by one\n",
" print \"0.Quit.\"\n",
" print \"1.Enter information\"\n",
" print \"2.Report information\"\n",
" print \"Choose one: \"\n",
" num=int(input())\n",
" return num #Return users selction\n",
"\n",
"#Enter information\n",
"def enter():\n",
" for i in range(10):\n",
" n=raw_input(\"Enter your name: \")\n",
" name.append(n)\n",
" phone.append(int(input(\"Enter your phone number\")))\n",
" hours.append(int(input(\"Enter number of hours worked: \")))\n",
" wage.append(int(input(\"Enter wage: \")))\n",
"\n",
"#Display report\n",
"def report():\n",
" p=len(name)\n",
" for i in range(p):\n",
" print name[i],' ',phone[i]\n",
" print \"Pay for the week: \",wage[i]*hours[i]\n",
"\n",
"\n",
"while True:\n",
" ch=menu() #get selection\n",
" if ch==0:\n",
" break\n",
" elif ch==1:\n",
" enter()\n",
" elif ch==2:\n",
" report()\n",
" else:\n",
" print \"Try again.\"\n",
" if ch==0:\n",
" break\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"0.Quit.\n",
"1.Enter information\n",
"2.Report information\n",
"Choose one: \n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"1\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your name: Anny\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your phone number987654321\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter number of hours worked: 10\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter wage: 50\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your name: Billy\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your phone number9456783652\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter number of hours worked: 10\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter wage: 50\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your name: Catherene\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your phone number9476836578\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter number of hours worked: 10\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter wage: 50\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your name: Dolly\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your phone number9831356748\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter number of hours worked: 15\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter wage: 50\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your name: Emily\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your phone number9576843721\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter number of hours worked: 15\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter wage: 40\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your name: Jack\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your phone number9485738567\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter number of hours worked: 10\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter wage: 45\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your name: Kevin\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your phone number9345678923\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter number of hours worked: 10\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter wage: 45\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your name: Lily\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your phone number9345672831\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter number of hours worked: 10\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter wage: 45\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your name: Monica\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your phone number9475867483\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter number of hours worked: 10\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter wage: 50\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your name: Irene\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your phone number5674356776\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter number of hours worked: 10\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter wage: 20\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"0.Quit.\n",
"1.Enter information\n",
"2.Report information\n",
"Choose one: \n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"2\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Anny 987654321\n",
"Pay for the week: 500\n",
"Billy 9456783652\n",
"Pay for the week: 500\n",
"Catherene 9476836578\n",
"Pay for the week: 500\n",
"Dolly 9831356748\n",
"Pay for the week: 750\n",
"Emily 9576843721\n",
"Pay for the week: 600\n",
"Jack 9485738567\n",
"Pay for the week: 450\n",
"Kevin 9345678923\n",
"Pay for the week: 450\n",
"Lily 9345672831\n",
"Pay for the week: 450\n",
"Monica 9475867483\n",
"Pay for the week: 500\n",
"Irene 5674356776\n",
"Pay for the week: 200\n",
"0.Quit.\n",
"1.Enter information\n",
"2.Report information\n",
"Choose one: \n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"0\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "code",
"collapsed": false,
"input": [],
"language": "python",
"metadata": {},
"outputs": []
}
],
"metadata": {}
}
]
}