{
"metadata": {
"name": "",
"signature": "sha256:a9141c3e95bf9510ebd3627775c232beb902109a956e0bd2f7e906b08fe40884"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 13: The Preprocessor and Debugging"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Program 13.2, page no. 576"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"y = 5\n",
"for x in range(20):\n",
" print \"x = %d y = %d\" %(x, y)\n",
" assert(x < y)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"ename": "AssertionError",
"evalue": "",
"output_type": "pyerr",
"traceback": [
"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[0;31mAssertionError\u001b[0m Traceback (most recent call last)",
"\u001b[0;32m<ipython-input-2-e6459a3dedb4>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m 2\u001b[0m \u001b[0;32mfor\u001b[0m \u001b[0mx\u001b[0m \u001b[0;32min\u001b[0m \u001b[0mrange\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;36m20\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 3\u001b[0m \u001b[0;32mprint\u001b[0m \u001b[0;34m\"x = %d y = %d\"\u001b[0m \u001b[0;34m%\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mx\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0my\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 4\u001b[0;31m \u001b[0;32massert\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mx\u001b[0m \u001b[0;34m<\u001b[0m \u001b[0my\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
"\u001b[0;31mAssertionError\u001b[0m: "
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"x = 0 y = 5\n",
"x = 1 y = 5\n",
"x = 2 y = 5\n",
"x = 3 y = 5\n",
"x = 4 y = 5\n",
"x = 5 y = 5\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Program 13.3, page no. 578"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"import time\n",
"import datetime\n",
"import math\n",
"\n",
"calendar_start = datetime.datetime.now()\n",
"cpu_start = time.time()\n",
"count = 0\n",
"iterations = 1000000\n",
"answer = 'y'\n",
"x = 0.0\n",
"print \"Initial clock time = \", cpu_start, \" Initial calendar time = \", calendar_start\n",
"while(answer.lower() == 'y'):\n",
" for i in range(iterations):\n",
" x = math.sqrt(3.14159265)\n",
" count += 1\n",
" print \"%d square roots completed.\\n\" %(iterations*count)\n",
" print \"Do you want to run some more(y or n)? \"\n",
" answer = raw_input()\n",
"\n",
"cpu_end = time.time()\n",
"calendar_end = datetime.datetime.now()\n",
"\n",
"\n",
"print \"Final clock time = \", cpu_end, \" Final calendar time = \", calendar_end\n",
"print \"CPU time for %d iterations is %.2f seconds\" %(count*iterations, (float(cpu_end-cpu_start)/time.clock()))\n",
"print \"Elapsed calendar time to execute the program is\", calendar_end-calendar_start, \" seconds\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Initial clock time = 1387828819.12 Initial calendar time = 2013-12-24 01:30:19.115309\n",
"1000000 square roots completed.\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Do you want to run some more(y or n)? \n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"y\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"2000000 square roots completed.\n",
"\n",
"Do you want to run some more(y or n)? \n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"n\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Final clock time = 1387828824.23 Final calendar time = 2013-12-24 01:30:24.232139\n",
"CPU time for 2000000 iterations is 4.49 seconds\n",
"Elapsed calendar time to execute the program is 0:00:05.116830 seconds\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Program 13.4, page no. 583"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"from datetime import *\n",
"import time\n",
"\n",
"day = [\"Monday\", \"Tuesday\", \"Wednesday\", \"Thursday\", \"Friday\", \"Saturday\", \"Sunday\"]\n",
"month = [\"January\", \"February\", \"March\", \"April\", \"May\", \"June\", \"July\", \"August\",\n",
" \"September\", \"October\", \"November\", \"December\"]\n",
" \n",
"now = datetime.now()\n",
"suffix = \"\"\n",
"\n",
"today = day[datetime.today().weekday()]\n",
"curr_month = month[now.month-1]\n",
"\n",
"if now.day == 1 or now.day == 21 or now.day == 31:\n",
" suffix= \"st\"\n",
"elif now.day == 2 or now.day == 22:\n",
" suffix= \"nd\"\n",
"elif now.day == 3 or now.day == 23:\n",
" suffix = \"rd\"\n",
"else:\n",
" suffix= \"th\"\n",
" \n",
"print \"Today is \", today, \" the \",str(now.day)+suffix, curr_month, str(now.year)+\".\", \"The time is \", time.strftime(\"%H:%M:%S\")"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Today is Tuesday the 24th December 2013. The time is 01:30:43\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Program 13.5, page no. 586"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"from datetime import *\n",
"import time\n",
"\n",
"day = [\"Monday\", \"Tuesday\", \"Wednesday\", \"Thursday\", \"Friday\", \"Saturday\", \"Sunday\"]\n",
"month = [\"January\", \"February\", \"March\", \"April\", \"May\", \"June\", \"July\", \"August\",\n",
" \"September\", \"October\", \"November\", \"December\"]\n",
" \n",
"now = datetime.now()\n",
"suffix = \"\"\n",
"\n",
"curr_month = month[now.month-1]\n",
"\n",
"print \"Enter a name: \",\n",
"name = raw_input()\n",
"print \"Enter a DOB for \", name\n",
"dob_day = int(raw_input(\"Day: \"))\n",
"dob_month = int(raw_input(\"Month: \"))\n",
"dob_year = int(raw_input(\"Year: \"))\n",
"dob_date = date(dob_year, dob_month, dob_day)\n",
"\n",
"if dob_day == 1 or dob_day == 21 or dob_day == 31:\n",
" suffix= \"st\"\n",
"elif dob_day == 2 or dob_day == 22:\n",
" suffix= \"nd\"\n",
"elif dob_day == 3 or dob_day == 23:\n",
" suffix = \"rd\"\n",
"else:\n",
" suffix= \"th\"\n",
"\n",
"dob_month = month[dob_month-1]\n",
"print name, \"Was born on \", str(dob_day)+suffix, dob_month, dob_year, \"which was a \", day[date.weekday(dob_date)]"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter a name: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Ricky\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Enter a DOB for Ricky\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Day: 5\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Month: 8\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Year: 1970\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Ricky Was born on 5th August 1970 which was a Wednesday\n"
]
}
],
"prompt_number": 4
}
],
"metadata": {}
}
]
}