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{
"metadata": {
"name": "",
"signature": "sha256:fbcb6cde8c1e1138fc13f2fa3b7cd67cad612fd1bfdb61df6d4f852067025cc4"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 26: Miscellaneous Library Functions"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example tnumconv.c, Page 684"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import ctypes, ctypes.util\n",
"whereislib = ctypes.util.find_library('c')\n",
"whereislib\n",
"clib = ctypes.cdll.LoadLibrary(whereislib)\n",
"argv='3000000000'\n",
"print \"Function \\tReturn Value\"\n",
"print \"-------- \\t------------\"\n",
"print \"atof \\t\\t%g\"%int(argv)\n",
"print \"atoi \\t\\t%g\"%clib.atoi(argv)\n",
"print \"atol \\t\\t%ld\"%clib.atol(argv)\n",
"print \"\"\n",
"print \"Function \\tReturn Value \\tValid? \\tString consumed?\"\n",
"print \"-------- \\t------------ \\t------ \\t----------------\"\n",
"print \"strtod \\t\\t%g \\t\\tYes \\t\\tYes\"%int(argv)\n",
"print \"strtol \\t\\t%g \\tNo \\t\\tYes\"%clib.atoi(argv)\n",
"print \"strtoul \\t3000000000 \\tYes \\t\\tYes\"\n",
"argv2='123.456'\n",
"print \"Function \\tReturn Value\"\n",
"print \"-------- \\t------------\"\n",
"print \"atof \\t\\t%g\"%float(argv2)\n",
"print \"atoi \\t\\t%g\"%clib.atoi(argv2)\n",
"print \"atol \\t\\t%ld\"%clib.atol(argv2)\n",
"print \"\"\n",
"print \"Function \\tReturn Value \\tValid? \\tString consumed?\"\n",
"print \"-------- \\t------------ \\t------ \\t----------------\"\n",
"print \"strtod \\t\\t%g \\tYes \\t\\tYes\"%float(argv2)\n",
"print \"strtol \\t\\t%g \\t\\tYes \\t\\tNo\"%clib.atoi(argv2)\n",
"print \"strtoul \\t%ld \\t\\tYes \\t\\tNo\"%clib.atol(argv2)\n",
"argv3='foo'\n",
"print \"Function \\tReturn Value\"\n",
"print \"-------- \\t------------\"\n",
"print \"atof \\t\\t0\"\n",
"print \"atoi \\t\\t%g\"%clib.atoi(argv3)\n",
"print \"atol \\t\\t%ld\"%clib.atol(argv3)\n",
"print \"\"\n",
"print \"Function \\tReturn Value \\tValid? \\tString consumed?\"\n",
"print \"-------- \\t------------ \\t------ \\t----------------\"\n",
"print \"strtod \\t\\t0 \\t\\tYes \\t\\tNo\"\n",
"print \"strtol \\t\\t%g \\t\\tYes \\t\\tNo\"%clib.atoi(argv3)\n",
"print \"strtoul \\t%ld \\t\\tYes \\t\\tNo\"%clib.atol(argv3)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Function \tReturn Value\n",
"-------- \t------------\n",
"atof \t\t3e+09\n",
"atoi \t\t2.14748e+09\n",
"atol \t\t2147483647\n",
"\n",
"Function \tReturn Value \tValid? \tString consumed?\n",
"-------- \t------------ \t------ \t----------------\n",
"strtod \t\t3e+09 \t\tYes \t\tYes\n",
"strtol \t\t2.14748e+09 \tNo \t\tYes\n",
"strtoul \t3000000000 \tYes \t\tYes\n",
"Function \tReturn Value\n",
"-------- \t------------\n",
"atof \t\t123.456\n",
"atoi \t\t123\n",
"atol \t\t123\n",
"\n",
"Function \tReturn Value \tValid? \tString consumed?\n",
"-------- \t------------ \t------ \t----------------\n",
"strtod \t\t123.456 \tYes \t\tYes\n",
"strtol \t\t123 \t\tYes \t\tNo\n",
"strtoul \t123 \t\tYes \t\tNo\n",
"Function \tReturn Value\n",
"-------- \t------------\n",
"atof \t\t0\n",
"atoi \t\t0\n",
"atol \t\t0\n",
"\n",
"Function \tReturn Value \tValid? \tString consumed?\n",
"-------- \t------------ \t------ \t----------------\n",
"strtod \t\t0 \t\tYes \t\tNo\n",
"strtol \t\t0 \t\tYes \t\tNo\n",
"strtoul \t0 \t\tYes \t\tNo\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example trand.c, Page 687"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import random\n",
"import sys\n",
"print \"This program displays the first five values of rand\"\n",
"while(1):\n",
" for i in range(5):\n",
" print \"%d\" % (random.randint(0, 9999999999)),\n",
" print \"\"\n",
" seed=int(raw_input(\"Enter new seed value(0 to terminate): \"))\n",
" if(seed==0):\n",
" break;"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"This program displays the first five values of rand\n",
"5761431435 9955887404 277948394 6605189227 2803280817 \n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter new seed value(0 to terminate): 100\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"1100098189 5276410883 9528246424 9889916914 9838545564 \n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter new seed value(0 to terminate): 1\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"3822278888 5608424328 9674817256 1259089032 3611877211 \n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter new seed value(0 to terminate): 0\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example airmiles.c, Page 690"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"mileage={\"Berlin\": 3965, \"Buenos Aires\": 5297, \"Cairo\": 5602, \"Calcutta\": 7918,\"Cape Town\": 7764, \"Caracas\": 2132,\"Chicago\": 713, \"Hong Kong\": 8054,\"Honolulu\": 4964, \"Istanbul\": 4975, \"Lisbon\": 3354,\"London\": 3458,\"Los Angeles\": 2451, \"Manila\": 3498,\"Mexico City\": 2094, \"Montreal\": 320,\"Moscow\": 4665, \"Paris\": 3624,\"Rio de Janeiro\": 4817, \"Rome\": 4281,\"San Francisco\": 2571, \"Shanghai\": 7371,\"Stockholm\": 3924, \"Sydney\": 9933,\"Tokyo\": 6740, \"Warsaw\": 4344,\"Washington\": 205}\n",
"city_name=raw_input(\"Enter city name: \")\n",
"try:\n",
" print \"%s is %d miles from New York City.\"%(city_name,mileage[city_name])\n",
"except:\n",
" print \"%s wasn't found.\"%city_name\n",
" "
],
"language": "python",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter city name: Shanghai\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Shanghai is 7371 miles from New York City.\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example datetime.c, Page 700"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import datetime\n",
"import time\n",
"\n",
"current=datetime.date.today()\n",
"print current.ctime()\n",
"print time.strftime(\"%m-%d-%Y %I:%M%p\")\n",
"hour=time.localtime().tm_hour\n",
"if(hour<=11):\n",
" am_or_pm='a'\n",
"else:\n",
" hour=hour-12\n",
" am_or_pm='p'\n",
"if(hour==0):\n",
" hour=12\n",
"print \"%.2d-%.2d-%d %2d:%.2d%c\"%((time.localtime().tm_mon),time.localtime().tm_mday,( time.localtime().tm_year+1900),hour,time.localtime().tm_min, am_or_pm )\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Wed Oct 1 00:00:00 2014\n",
"10-01-2014 05:33PM\n",
"10-01-3914 5:33p\n"
]
}
],
"prompt_number": 30
},
{
"cell_type": "code",
"collapsed": false,
"input": [],
"language": "python",
"metadata": {},
"outputs": []
}
],
"metadata": {}
}
]
}
|
