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{
"metadata": {
"name": "",
"signature": "sha256:d3ec56f0fb1e7a95eb53ee17745721c0f8fa66da6256b85d8eb402b33b736e2d"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Hour 20 : Understanding Unions"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 20.1, Page No 335"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"class menu:\n",
" def __init__(self,name,price):\n",
" self.name = name\n",
" self.price = price\n",
"if __name__ == '__main__':\n",
" print \"The content assigned to the union separately:\\n\"\n",
" dish = menu(\"Sweet and Sour Chicken\",9.95)\n",
" print \"Dish Name: \",dish.name\n",
" print \"Dish Price: \",dish.price"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The content assigned to the union separately:\n",
"\n",
"Dish Name: Sweet and Sour Chicken\n",
"Dish Price: 9.95\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 20.2, Page No 338"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"class employee:\n",
" def __init__(self,start_year,dpt_code,id_number):\n",
" self.start_year = start_year\n",
" self.dpt_code = dpt_code\n",
" self.id_number = id_number\n",
"if __name__ == '__main__':\n",
" info = employee(1997,8,1234)\n",
" print \"Start Year: \",info.start_year,\"\\n\"\n",
" print \"Dpt. Code: \",info.dpt_code,\"\\n\"\n",
" print \"ID Number: \",info.id_number,\"\\n\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Start Year: 1997 \n",
"\n",
"Dpt. Code: 8 \n",
"\n",
"ID Number: 1234 \n",
"\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 20.3, page no. 340"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import sys\n",
"class u:\n",
" def __init__(self,x,y):\n",
" self.x = x\n",
" self.y = y\n",
"class s:\n",
" def __init__(self,x,y):\n",
" self.x = x\n",
" self.y = y\n",
"if __name__ == '__main__':\n",
" a_union = u(10,20)\n",
" a_struct = s(10,20)\n",
" #print \"The size of double: \",sys.getsizeof(double),\"byte\\n\" Double is not in python\n",
" print \"The size of int: \",sys.getsizeof(int),\"byte\\n\"\n",
" print \"The size of union: \",sys.getsizeof(a_union),\"byte\\n\"\n",
" print \"The size of struct: \",sys.getsizeof(a_struct),\"byte\\n\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The size of int: 872 byte\n",
"\n",
"The size of union: 72 byte\n",
"\n",
"The size of struct: 72 byte\n",
"\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 20.4, Page No 341"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"class u:\n",
" ch = [0, 0]\n",
" num = 0\n",
"\n",
"def UnionInitialize(val):\n",
" val.ch[0] = 'H'\n",
" val.ch[1] = 'I'\n",
" return val.ch\n",
"if __name__ == '__main__':\n",
" val = u()\n",
" x = UnionInitialize(val)\n",
" print \"The two characters held by the union:\\n\"\n",
" print x[0],\"\\n\"\n",
" print x[1],\"\\n\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The two characters held by the union:\n",
"\n",
"H \n",
"\n",
"I \n",
"\n"
]
}
],
"prompt_number": 11
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 20.5, Page No 344"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"class survey:\n",
" def __init__(self,name,c_d_p,age,hour_per_week):\n",
" self.name = name\n",
" self.c_d_p = c_d_p\n",
" self.age = age\n",
" self.hour_per_week = hour_per_week\n",
" class provider:\n",
" def __init__(self,cable_company,dish_company):\n",
" self.cable_company = cable_company\n",
" self.dish_company = dish_company\n",
"def DataEnter(ptr):\n",
" is_yes = raw_input(\"Are you using cable at home? (Yes or No): \")\n",
" if is_yes == 'Y' or is_yes == 'y':\n",
" ptr.provider.cable_company = raw_input(\"Enter the cable company name: \")\n",
" ptr.c_d_p = 'c'\n",
" else:\n",
" is_yes = raw_input(\"Are you using a satellite dish? (Yes or No): \")\n",
" if is_yes == 'Y' or is_yes == 'y':\n",
" ptr.provider.dish_company = raw_input(\"Enter the satellite dish company name: \")\n",
" ptr.c_d_p = 'd'\n",
" else:\n",
" ptr.c_d_p = 'p'\n",
" ptr.name = raw_input(\"Please enter your name: \")\n",
" ptr.age = int(raw_input(\"Your age : \"))\n",
" ptr.hour_per_week = int(raw_input(\"How many hours you spend on watching TV per week: \"))\n",
"def DataDisplay(ptr):\n",
" print \"\\nHere\u2019s what you\u2019ve entered:\\n\"\n",
" print \"Name: \",ptr.name,\"\\n\"\n",
" print \"Age: \",ptr.age,\"\\n\"\n",
" print \"Hour per week: \",ptr.hour_per_week,\"\\n\"\n",
" if ptr.c_d_p == 'c':\n",
" print \"Your cable company is: \",ptr.provider.cable_company,\"\\n\"\n",
" elif ptr.c_d_p == 'd':\n",
" print \"Your satellite dish company is: \",ptr.provider.dish_company,\"\\n\"\n",
" else:\n",
" print \"You don\u2019t have cable or a satellite dish.\\n\"\n",
" print \"\\nThanks and Bye!\\n\"\n",
"if __name__ == '__main__':\n",
" tv = survey(\"\",\"\",\"\",\"\")\n",
" DataEnter(tv)\n",
" DataDisplay(tv)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Are you using cable at home? (Yes or No): N\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Are you using a satellite dish? (Yes or No): Y\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter the satellite dish company name: ABCD Company\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Please enter your name: Tony Zhang\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Your age : 30\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"How many hours you spend on watching TV per week: 8\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" \n",
"Here\u2019s what you\u2019ve entered:\n",
"\n",
"Name: Tony Zhang \n",
"\n",
"Age: 30 \n",
"\n",
"Hour per week: 8 \n",
"\n",
"Your satellite dish company is: ABCD Company \n",
"\n",
"\n",
"Thanks and Bye!\n",
"\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 20.6, Page No 348"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"class bit_field:\n",
" def __init__(self,cable,dish):\n",
" self.cable = cable\n",
" self.dish = dish\n",
" cable = 1\n",
" dish = 1\n",
"class survey:\n",
" def __init__(self,name,age,hour_per_week):\n",
" self.name = name\n",
" self.age = age\n",
" self.hour_per_week = hour_per_week\n",
" c_d = bit_field(\"\",\"\")\n",
" class provider:\n",
" def __init__(self,cable_company,dish_company):\n",
" self.cable_company = cable_company\n",
" self.dish_company = dish_company\n",
"def DataEnter(ptr):\n",
" is_yes = raw_input(\"Are you using cable at home? (Yes or No): \")\n",
" if is_yes == 'Y' or is_yes == 'y':\n",
" ptr.provider.cable_company = raw_input(\"Enter the cable company name: \")\n",
" ptr.c_d.cable = 1\n",
" ptr.c_d.dish = 0\n",
" else:\n",
" is_yes = raw_input(\"Are you using a satellite dish? (Yes or No): \")\n",
" if is_yes == 'Y' or is_yes == 'y':\n",
" ptr.provider.dish_company = raw_input(\"Enter the satellite dish company name: \")\n",
" ptr.c_d.cable = 0\n",
" ptr.c_d.dish = 1\n",
" else:\n",
" ptr.c_d.cable = 0\n",
" ptr.c_d.dish = 0\n",
" ptr.name = raw_input(\"Please enter your name: \")\n",
" ptr.age = int(raw_input(\"Your age : \"))\n",
" ptr.hour_per_week = int(raw_input(\"How many hours you spend on watching TV per week: \"))\n",
"def DataDisplay(ptr):\n",
" print \"\\nHere\u2019s what you\u2019ve entered:\\n\"\n",
" print \"Name: \",ptr.name,\"\\n\"\n",
" print \"Age: \",ptr.age,\"\\n\"\n",
" print \"Hour per week: \",ptr.hour_per_week,\"\\n\"\n",
" if ptr.c_d.cable and not ptr.c_d.dish:\n",
" print \"Your cable company is: \",ptr.provider.cable_company,\"\\n\"\n",
" elif not ptr.c_d.cable and ptr.c_d.dish:\n",
" print \"Your satellite dish company is: \",ptr.provider.dish_company,\"\\n\"\n",
" else:\n",
" print \"You don\u2019t have cable or a satellite dish.\\n\"\n",
" print \"\\nThanks and Bye!\\n\"\n",
"if __name__ == '__main__':\n",
" tv = survey(\"\",\"\",\"\")\n",
" DataEnter(tv)\n",
" DataDisplay(tv)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Are you using cable at home? (Yes or No): N\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Are you using a satellite dish? (Yes or No): Y\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter the satellite dish company name: ABCD Company\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Please enter your name: Tony Zhang\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Your age : 30\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"How many hours you spend on watching TV per week: 8\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Here\u2019s what you\u2019ve entered:\n",
"\n",
"Name: Tony Zhang \n",
"\n",
"Age: 30 \n",
"\n",
"Hour per week: 8 \n",
"\n",
"Your satellite dish company is: ABCD Company \n",
"\n",
"\n",
"Thanks and Bye!\n",
"\n"
]
}
],
"prompt_number": 6
}
],
"metadata": {}
}
]
}
|
