{
"metadata": {
"name": "",
"signature": "sha256:f0e84b29896f17b0ff44f8bccf20cf041a408375d83b3bc2290848ec54364369"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 9 - Functions"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 9.1, page no. 179"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"def main(): #defining a function \n",
" print \"Hello World!\"\n",
"\n",
"main()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Hello World!\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 9.2, page no. 180"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"def printMessage(): # defining function\n",
" print \"Hello world!\"\n",
"\n",
"printMessage() # calling the function"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Hello world!\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 9.3, page no. 181"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"printMessage();\n",
"\n",
"def printMessage():\n",
" print \"Hello world!\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Hello world!\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 9.4, page no. 182"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"def printMessage():\n",
" print \"Hello world!\"\n",
"\n",
"printMessage()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Hello world!\n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 9.5, page no. 184"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"def printMessage():\n",
" times += 1\n",
" print \"This function called \", times, \" times\"\n",
"\n",
"\n",
"times = 0\n",
"choice = '1'\n",
"while(choice != 'Q'):\n",
" print \"Enter Q to quit, any other character to continue: \",\n",
" choice = raw_input()\n",
" if (choice == 'Q'):\n",
" print \"Input stopped\"\n",
" else:\n",
" printMessage()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter Q to quit, any other character to continue: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"e\n"
]
},
{
"ename": "UnboundLocalError",
"evalue": "local variable 'times' referenced before assignment",
"output_type": "pyerr",
"traceback": [
"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mUnboundLocalError\u001b[0m Traceback (most recent call last)",
"\u001b[1;32m<ipython-input-8-42e131eb489c>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m 17\u001b[0m \u001b[1;32mprint\u001b[0m \u001b[1;34m\"Input stopped\"\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 18\u001b[0m \u001b[1;32melse\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m---> 19\u001b[1;33m \u001b[0mprintMessage\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[1;32m<ipython-input-8-42e131eb489c>\u001b[0m in \u001b[0;36mprintMessage\u001b[1;34m()\u001b[0m\n\u001b[0;32m 5\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 6\u001b[0m \u001b[1;32mdef\u001b[0m \u001b[0mprintMessage\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 7\u001b[1;33m \u001b[0mtimes\u001b[0m \u001b[1;33m+=\u001b[0m \u001b[1;36m1\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m 8\u001b[0m \u001b[1;32mprint\u001b[0m \u001b[1;34m\"This function called \"\u001b[0m\u001b[1;33m,\u001b[0m \u001b[0mtimes\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;34m\" times\"\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 9\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n",
"\u001b[1;31mUnboundLocalError\u001b[0m: local variable 'times' referenced before assignment"
]
}
],
"prompt_number": 8
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 9.6, page no. 185"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"def printMessage():\n",
" times = 0\n",
" times += 1\n",
" print \"This function called \", times, \" times\"\n",
"\n",
"\n",
"choice = '1'\n",
"while(choice != 'Q'):\n",
" print \"Enter Q to quit, any other character to continue: \",\n",
" choice = raw_input()\n",
" if (choice == 'Q'):\n",
" print \"Input stopped\"\n",
" else:\n",
" printMessage()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Enter Q to quit, any other character to continue: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"w\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" This function called 1 times\n",
"Enter Q to quit, any other character to continue: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"q\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" This function called 1 times\n",
"Enter Q to quit, any other character to continue: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Q\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Input stopped\n"
]
}
],
"prompt_number": 9
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 9.7, page no. 186"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"times = 0\n",
"def printMessage():\n",
" global times\n",
" times += 1\n",
" print \"This function called \", times, \" times\"\n",
"\n",
"\n",
"choice = '1'\n",
"while(choice != 'Q'):\n",
" print \"Enter Q to quit, any other character to continue: \",\n",
" choice = raw_input()\n",
" if (choice == 'Q'):\n",
" print \"Input stopped\"\n",
" else:\n",
" printMessage()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter Q to quit, any other character to continue: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"w\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" This function called 1 times\n",
"Enter Q to quit, any other character to continue: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"t\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" This function called 2 times\n",
"Enter Q to quit, any other character to continue: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"u\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" This function called 3 times\n",
"Enter Q to quit, any other character to continue: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Q\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Input stopped\n"
]
}
],
"prompt_number": 11
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 9.8, page no. 189"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"times = 0\n",
"def printMessage():\n",
" global times\n",
" times += 1\n",
" print \"This function called \", times, \" times\"\n",
"\n",
"\n",
"choice = '1'\n",
"while(choice != 'Q'):\n",
" print \"Enter Q to quit, any other character to continue: \",\n",
" choice = raw_input()\n",
" if (choice == 'Q'):\n",
" print \"Input stopped\"\n",
" else:\n",
" printMessage()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter Q to quit, any other character to continue: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"w\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" This function called 1 times\n",
"Enter Q to quit, any other character to continue: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"r\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" This function called 2 times\n",
"Enter Q to quit, any other character to continue: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"t\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" This function called 3 times\n",
"Enter Q to quit, any other character to continue: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Q\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Input stopped\n"
]
}
],
"prompt_number": 12
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 9.9, page no. 190"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"def printMessage():\n",
" print \"You inputted \", str\n",
"\n",
"print \"Enter a string: \",\n",
"str = raw_input()\n",
"printMessage()\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter a string: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Jeff\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" You inputted Jeff\n"
]
}
],
"prompt_number": 22
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 9.10, page no. 191"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"def printMessage(s):\n",
" print \"You inputted \", s\n",
"\n",
"print \"Enter a string: \",\n",
"str = raw_input()\n",
"printMessage(str)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter a string: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Jeff\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" You inputted Jeff\n"
]
}
],
"prompt_number": 21
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 9.11, page no. 193"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"def printMessage(firstName, lastName):\n",
" print \"Your name is \", firstName, \" \", lastName\n",
"\n",
"print \"Enter first name:\",\n",
"name1 = raw_input()\n",
"print \"Enter last name:\",\n",
"name2 = raw_input()\n",
"printMessage(name1, name2)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter first name:"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Jeff\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Enter last name:"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Kent\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Your name is Jeff Kent\n"
]
}
],
"prompt_number": 20
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 9.12, page no. 194"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"def printMessage(thename, theage):\n",
" print \"Your name is \", thename, \" and your age is\", theage\n",
"\n",
"print \"Enter name:\",\n",
"name = raw_input()\n",
"print \"Enter age:\",\n",
"age = int(raw_input())\n",
"printMessage(name, age)\n",
"printMessage(age, name)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter name:"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Jeff\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Enter age:"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"34\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Your name is Jeff and your age is 34\n",
"Your name is 34 and your age is Jeff\n"
]
}
],
"prompt_number": 17
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 9.13, page no. 195"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"def doubleIt(x):\n",
" print \"The number to be doubled is \", x\n",
" x *= 2\n",
" print \"The number doubled in doubleIt is \", x\n",
"\n",
"print \"Enter number: \",\n",
"num = int(raw_input())\n",
"doubleIt(num)\n",
"print \"The number doubled outside the function is \", num,"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter number: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"34\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" The number to be doubled is 34\n",
"The number doubled in doubleIt is 68\n",
"The number doubled outside the function is 34\n"
]
}
],
"prompt_number": 18
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 9.14, page no. 196"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"li = [0]\n",
"def doubleIt():\n",
" print \"The number to be doubled is \", li[0]\n",
" li[0] *= 2\n",
" print \"The number doubled in doubleIt is \", li[0]\n",
" \n",
"print \"Enter number: \",\n",
"num = int(raw_input())\n",
"li[0] = num\n",
"doubleIt()\n",
"print \"The number doubled outside the function is \", li[0]"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter number: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"5\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" The number to be doubled is 5\n",
"The number doubled in doubleIt is 10\n",
"The number doubled outside the function is 10\n"
]
}
],
"prompt_number": 19
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 9.15, page no. 197"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"z = []\n",
"def addNumbers (a, b):\n",
" z.append(a + b)\n",
"\n",
"\n",
"print \"Enter first number: \",\n",
"firstNum = int(raw_input())\n",
"print \"Enter second number: \",\n",
"secondNum = int(raw_input())\n",
"addNumbers(firstNum, secondNum)\n",
"print firstNum, \" + \", secondNum, \" = \", z[0]"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter first number: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"3\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Enter second number: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"4\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" 3 + 4 = 7\n"
]
}
],
"prompt_number": 23
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"example 9.16, page no. 199"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"def addNumbers(x, y):\n",
" return x + y\n",
"\n",
"print \"Enter first number: \",\n",
"firstNum = int(raw_input())\n",
"print \"Enter second number: \",\n",
"secondNum = int(raw_input())\n",
"sum = addNumbers(firstNum, secondNum)\n",
"print firstNum, \" + \", secondNum, \" = \", sum\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter first number: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"4\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Enter second number: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"5\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" 4 + 5 = 9\n"
]
}
],
"prompt_number": 24
}
],
"metadata": {}
}
]
}