{
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"worksheets": [
{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h1>Chapter 7: Functions,Part One: The Fundamentals<h1>"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.1, Page Number: 129<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"def f1():\n",
" print \"Enter something: \"\n",
" str= \"Hello\" #User-input\n",
" print str\n",
" \n",
"#Variable decleration\n",
"str=\"This is str in main\"\n",
"\n",
"print str\n",
"f1() #function call\n",
"print str"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"This is str in main\n",
"Enter something: \n",
"Hello\n",
"This is str in main\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.2, Page Number: 130<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"#Variable decleration\n",
"choice=0\n",
"\n",
"print \"(1) add numbers or (2) concatenate strings?: \"\n",
"choice=2 #User Input taken as 2\n",
"\n",
"if choice==1:\n",
" print \"Enter two numbers: \"\n",
" a=5 #Variable decleration; User Input\n",
" b=7\n",
" print a+b #Result\n",
"else :\n",
" print \"Enter two strings: \"\n",
" s1=\"Hello\" #Variable decleration; User Input\n",
" s2=\"World\"\n",
" s1+=s2 #Concatenation\n",
" print s1 #Result"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"(1) add numbers or (2) concatenate strings?: \n",
"Enter two strings: \n",
"HelloWorld\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.3, Page Number: 131<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"#Variable decleration\n",
"i=10\n",
"j=100\n",
"\n",
"if j>0:\n",
" i=None \n",
" i= j/2\n",
" print \"inner i: \",i #Result\n",
"\n",
"print \"outer i: \",i #Result"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"inner i: 50\n",
"outer i: 50\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.4, Page Number: 132<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"a=5 #Variable decleration; user input\n",
"\n",
"b=10 #declaration of another variable; user input\n",
"\n",
"#Result\n",
"print \"Product: \",a*b"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Product: 50\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.5, Page Number: 134<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"import random\n",
"\n",
"#Variable decleration\n",
"count=None\n",
"num_right=0\n",
"\n",
"#Function for the drill\n",
"def drill():\n",
" #Generate two numbers between 0 and 99.\n",
" a=random.randint(0,99)\n",
" b=random.randint(0,99)\n",
" #The user gets three tries to get it right.\n",
" for count in range(3):\n",
" print \"What is \",a,\" + \",b,\"? \"\n",
" ans = random.randint(0,200) #user input\n",
" if ans==a+b:\n",
" print \"Right\"\n",
" num_right+=1\n",
" print \"You've used up all your tries.\"\n",
" print \"The answer is \",a+b\n",
" \n",
"#Main function \n",
"print \"How many practice problems: \"\n",
"count=2 #User input taken as 2\n",
"num_right=0\n",
"while True:\n",
" drill()\n",
" count-=1\n",
" if(count==0):\n",
" break\n",
" \n",
"#Result\n",
"print \"You got \",num_right,\" right. \" \n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"How many practice problems: \n",
"What is 9 + 89 ? \n",
"What is 9 + 89 ? \n",
"What is 9 + 89 ? \n",
"You've used up all your tries.\n",
"The answer is 98\n",
"What is 85 + 98 ? \n",
"What is 85 + 98 ? \n",
"What is 85 + 98 ? \n",
"You've used up all your tries.\n",
"The answer is 183\n",
"You got 0 right. \n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.6, Page Number: 136<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"from ctypes import *\n",
" \n",
"def f(j):\n",
" j[0]=100 #j is assigned 100\n",
"\n",
"#Variable decleration\n",
"i=c_int(1)\n",
"p=pointer(i)\n",
"\n",
"#Calling the function\n",
"f(p) \n",
"\n",
"print i"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"c_long(100)\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.7, Page Number: 137<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"from ctypes import *\n",
"\n",
" \n",
"def f(j):\n",
" j[0]=100 #j is assigned 100\n",
"\n",
"#Variable decleration\n",
"i=c_int(1)\n",
"p=pointer(i)\n",
"\n",
"#Calling the function\n",
"f(p) \n",
"\n",
"print i"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"c_long(100)\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.8, Page Number: 137<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"def display(num):\n",
" for i in range(10):\n",
" print num[i],\n",
" \n",
"#Variable declaration\n",
"t=[]\n",
"\n",
"for i in range(10):\n",
" t.append(i)\n",
"#Pass list to a function\n",
"display(t)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"0 1 2 3 4 5 6 7 8 9\n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.9, Page Number: 138<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"def display(num):\n",
" print num,\n",
"\n",
"#Variable declaration\n",
"t=[]\n",
"\n",
"for i in range(10):\n",
" t.append(i)\n",
" \n",
"#Printing without passing entire list\n",
"for i in range(10):\n",
" display(t[i])"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"0 1 2 3 4 5 6 7 8 9\n"
]
}
],
"prompt_number": 8
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.10, Page Number: 139<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"def cube(n,num):\n",
" num-=1\n",
" while num:\n",
" n[num]=n[num]*n[num]*n[num]\n",
" num-=1\n",
"\n",
"#Variable declaration\n",
"nums=[]\n",
"\n",
"for i in range(10):\n",
" nums.append(i+1)\n",
" \n",
"print \"Original contents: \",\n",
"for i in range(10):\n",
" print nums[i],\n",
"print\n",
"\n",
"cube(nums,10) #Compute cubes\n",
"\n",
"#Result\n",
"print \"Altered contents: \",\n",
"for i in range(10):\n",
" print nums[i],"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Original contents: 1 2 3 4 5 6 7 8 9 10\n",
"Altered contents: 1 8 27 64 125 216 343 512 729 1000\n"
]
}
],
"prompt_number": 10
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.11, Page Number: 140<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"import string\n",
"\n",
"def stringupper(str):\n",
" str=string.upper(str) #convert to uppercase\n",
" return str\n",
"\n",
"#Variable declaration \n",
"str=\"this is a test\"\n",
"\n",
"#Calling the function\n",
"str=stringupper(str)\n",
"\n",
"#Result\n",
"print str"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"THIS IS A TEST\n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.12, Page Number: 141<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"def mystrlen(str):\n",
" l=len(str)\n",
" return l\n",
"\n",
"#Result\n",
"print \"Length of Hello There is: \",\n",
"print mystrlen(\"Hello There\")"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Length of Hello There is: 11\n"
]
}
],
"prompt_number": 11
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.13, Page Number: 142<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"import sys\n",
"\n",
"def main():\n",
" if len(sys.argv)!=2:\n",
" print \"You forgot to type your name.\" #CHECK!!!!\n",
" return\n",
" #Result\n",
" print \"Hello \",sys.argv[1]\n",
"\n",
"main()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"You forgot to type your name.\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.14, Page Number: 143<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import sys\n",
"\n",
"#Result\n",
"for t in range(len(sys.argv)):\n",
" i=0\n",
" print sys.argv[t] "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"-c\n",
"-f\n",
"C:\\Users\\Anandi\\.ipython\\profile_default\\security\\kernel-6e851974-75ff-4911-bdf9-e089a03e5741.json\n",
"--KernelApp.parent_appname='ipython-notebook'\n",
"--interrupt=904\n",
"--parent=876\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.15, Page Number: 144<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"import sys\n",
"\n",
"if len(sys.argv)!=3:\n",
" print \"usage: add num num\" \n",
"else :\n",
" #Variable Decleration\n",
" a=sys.argv[1]\n",
" b=sys.argv[2]\n",
" #Result\n",
" print a+b\n",
" \n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"usage: add num num\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.16, Page Number: 145<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"import string\n",
"\n",
"#Variable Decleration\n",
"i=string.atoi(\"100\")\n",
"j=string.atoi(\"100000\")\n",
"k=string.atof(\"-0.123\")\n",
"\n",
"#Result\n",
"print i,\" \",j,\" \",k"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"100 100000 -0.123\n"
]
}
],
"prompt_number": 13
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.17, Page Number: 147<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"#Variable Decleration\n",
"i=abs(-10)\n",
"\n",
"#Result\n",
"print abs(-23)\n",
"abs(100)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"23\n"
]
},
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 5,
"text": [
"100"
]
}
],
"prompt_number": 5
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.18, Page Number: 148<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"def find_substr(sub,str):\n",
" l=str.find(sub)\n",
" return l\n",
"\n",
"#Variable decleration;Calling the function\n",
"index=find_substr(\"three\",\"one two three four\")\n",
"\n",
"#Result\n",
"print \"Index of three is \",index"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Index of three is 8\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.19, Page Number: 149<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"import sys\n",
"\n",
"def print_vertical(str):\n",
" l=len(str)\n",
" for i in range(l):\n",
" print str[i],\n",
" \n",
"print_vertical(sys.argv[1])\n",
" "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"- f\n"
]
}
],
"prompt_number": 14
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.20, Page Number: 150<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"def find_substr(sub,str):\n",
" return str.find(sub)\n",
"\n",
"#Variable declaration\n",
"s=\"one two three four\"\n",
"\n",
"substr = find_substr(\"three\",s)\n",
"\n",
"#Result\n",
"print \"substring found:\",s[substr:]\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"substring found: three four\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.21, Page Number: 154<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"def factr(n):\n",
" if n==1:\n",
" return 1\n",
" answer=factr(n-1)*n\n",
" return answer\n",
"\n",
"#Iterative version\n",
"def fact(n):\n",
" answer=1\n",
" for t in range(n):\n",
" answer=answer*(t+1)\n",
" return answer\n",
"\n",
"#Using recursion version\n",
"print \"4 factorial is \",factr(4)\n",
"\n",
"#Using iterative version\n",
"print \"4 factorial is \",fact(4)\n",
"\n",
" "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"4 factorial is 24\n",
"4 factorial is 24\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 7.22, Page Number: 155<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"def reverse(s):\n",
" r = \"\"\n",
" for c in s:\n",
" r=c+r\n",
" print r\n",
" \n",
"#VariabDecleration \n",
"str=\"this is a test\"\n",
"\n",
"#Calling function\n",
"reverse(str)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"tset a si siht\n"
]
}
],
"prompt_number": 9
},
{
"cell_type": "code",
"collapsed": false,
"input": [],
"language": "python",
"metadata": {},
"outputs": []
}
],
"metadata": {}
}
]
}