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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"1: Overview of Data Structures and Algorithms"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1: Page 20"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"class Thermostat:\n",
"\t\"\"\"A simple thermostat class\"\"\"\n",
" \n",
"\t#since private instance variables don't exist in Python,\n",
" #hence using a convention: name prefixed with an underscore, to treat them as non-public part\n",
"\t_currentTemp = 0.0\n",
"\t_desiredTemp = 0.0\n",
"\n",
"\tdef furnace_on(self):\n",
"\t\t#method body goes here\n",
"\t\tpass\n",
"\n",
"\tdef furnace_off(self):\n",
"\t\t#method body goes here\n",
"\t\tpass\n",
" \n",
"#end class Thermostat"
],
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 2: Page 22"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#demonstrates basic OOP syntax\n",
"\n",
"class BankAccount:\n",
"\t\"\"\"A simple bank account class\"\"\"\n",
"\t\n",
"\tdef __init__(self, openingBalance):\t#special method to create objects\n",
" #with instances customized to a specific initial state\n",
"\t\t\n",
" #since private instance variables don't exist in Python,\n",
" #hence using a convention: name prefixed with an underscore, to treat them as non-public part\n",
"\t self._balance = openingBalance\t#account balance\n",
"\n",
"\tdef deposit(self, amount):\t#makes deposit\n",
"\t\tself._balance = self._balance + amount\n",
"\n",
"\tdef withdraw(self, amount):\t#makes withdrawl\n",
"\t\tself._balance = self._balance - amount\n",
"\n",
"\tdef display(self):\t#displays balance\n",
"\t\tprint 'Balance=', self._balance\n",
" \n",
"#end class BankAccount\n",
"\n",
"ba1 = BankAccount(100.00)\t#create account\n",
"\n",
"print 'Before transactions, ',\n",
"ba1.display()\t#display balance\n",
"\n",
"ba1.deposit(74.35)\t#make deposit\n",
"ba1.withdraw(20.00)\t#make withdrawl\n",
"\n",
"print 'After transactions, ',\n",
"ba1.display()\t#display balance\n",
"#end"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Before transactions, Balance= 100.0\n",
"After transactions, Balance= 154.35\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 3: Page 25"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#creating string objects\n",
"str1 = ''\n",
"str2 = 'George'\n",
"\n",
"#verifying results\n",
"print str1\n",
"print str2\n",
"\n",
"#naming string object\n",
"str3 = 'amanuensis'\n",
"\n",
"#verifying results\n",
"print str3\n",
"\n",
"#accessing specific characters from string using [] operator\n",
"ch1 = str2[3]\n",
"\n",
"#verifying results\n",
"print ch1\n",
"\n",
"#finding and printing number of characters in a string\n",
"print len(str1)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"George\n",
"amanuensis\n",
"r\n",
"0\n"
]
}
],
"prompt_number": 3
}
],
"metadata": {}
}
]
}
|
