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{
"metadata": {
"name": "",
"signature": "sha256:275b458b34ae91067224e50705db107812d45fc58e5291ede57a7d2fe00a2167"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 14: Advanced and Specialized Topics"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Program 14.1, page no. 592"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"import string\n",
"import sys\n",
"\n",
"print \"Enter a character: \",\n",
"ch = raw_input()\n",
"\n",
"if ch.isalnum():\n",
" if ch.isdigit():\n",
" print \"You entered the digit \", ch\n",
" elif ch.islower():\n",
" print \"You entered a lower case \", ch.upper()\n",
" elif ch.isupper():\n",
" print \"You entered a upper case \", ch.lower()\n",
" elif ch in string.punctuation:\n",
" print \"You entered a punctuation character \", ch\n",
" else:\n",
" print \"You entered \", ch, \"but I don't know what it is!\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter a character: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"g\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" You entered a lower case G\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Program 14.2, page no. 596"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"print \"Enter a string of less than 100 characters: \",\n",
"text = raw_input()\n",
"\n",
"print \"Enter the string sought: \",\n",
"sought = raw_input()\n",
"sought = sought.lower()\n",
"count = 0\n",
"\n",
"sought_len = len(sought)\n",
"\n",
"for i in range(len(text)):\n",
" substr = text[i:sought_len+i]\n",
" if substr == sought:\n",
" count += 1\n",
"\n",
"print \"First string entered: \", text\n",
"print \"Second string entered: \", sought\n",
"print \"The second string was found in first %d times\" %count\n",
"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter a string of less than 100 characters: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Smith, where Jones had had, \"had\", had had \"had had\". Enter the string sought (less than 40 characters): Had\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Enter the string sought: "
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"had\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
" First string entered: Smith, where Jones had had, \"had\", had had \"had had\". Enter the string sought (less than 40 characters): Had\n",
"Second string entered: had\n",
"The second string was found in first 7 times\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Program 14.3, page no. 606"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"cx = 1.0 + 3.0j\n",
"cy = 1.0 - 4.0j\n",
"\n",
"sum = cx + cy\n",
"diff = cx - cy\n",
"product = cx * cy\n",
"quotient = cy/cy\n",
"conjugate = cx.conjugate()\n",
"\n",
"print \"Complex numbers are supported\"\n",
"print \"Working with complex numbers: \"\n",
"print \"Starting values: cx = %.2f%+.2fi cy = %.2f%+.2fi\" %(cx.real, cx.imag, cy.real, cy.imag)\n",
"print \"The sum cx + cy = %.2f%+.2fi\" %(sum.real, sum.imag)\n",
"print \"The difference cx - cy = %.2f%+.2fi\" %(diff.real, diff.imag)\n",
"print \"The product cx * cy = %.2f%+.2fi\" %(product.real, product.imag)\n",
"print \"The quotient cx / cy = %.2f%+.2fi\" %(quotient.real, quotient.imag)\n",
"print \"The conjugate of cx = %.2f%+.2fi\" %(conjugate.real, conjugate.imag)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Complex numbers are supported\n",
"Working with complex numbers: \n",
"Starting values: cx = 1.00+3.00i cy = 1.00-4.00i\n",
"The sum cx + cy = 2.00-1.00i\n",
"The difference cx - cy = 0.00+7.00i\n",
"The product cx * cy = 13.00-1.00i\n",
"The quotient cx / cy = 1.00-0.00i\n",
"The conjugate of cx = 1.00-3.00i\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Program 14.4, page no. 610"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"from threading import Thread\n",
"\n",
"def get_data(pdata):\n",
" pd = pdata\n",
" print \"The get_data thread received: data.a=%d and data.b=%d\" %(pd[0], pd[1])\n",
" pd[0] *= 3\n",
" print \"The get_data thread makes it: data.a=%d and data.b=%d \" %(pd[0], pd[1])\n",
" \n",
"def process_data(pdata):\n",
" pd = pdata\n",
" print \"The process_data thread received: data.a=%d and data.b=%d \"%(pd[0], pd[1])\n",
" \n",
"mydata = [123, 345]\n",
"print \"Before starting the get_data thread: mydata.a=%d and mydata. b=%d\" %(mydata[0], mydata[1])\n",
"print \"get_data thread started.\"\n",
"t1 = Thread(target=get_data, args=(mydata,))\n",
"t1.start()\n",
"Thread.join(t1)\n",
"print \"process_data thread started.\"\n",
"t2 = Thread(target=process_data, args=(mydata,))\n",
"t2.start()\n",
"Thread.join(t2)\n",
"print \"After both threads finish executing: mydata.a=%d and mydata. b=%d\" %(mydata[0], mydata[1])"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Before starting the get_data thread: mydata.a=123 and mydata. b=345\n",
"get_data thread started.\n",
"The get_data thread received: data.a=123 and data.b=345\n",
"The get_data thread makes it: data.a=369 and data.b=345 \n",
"process_data thread started.\n",
"The process_data thread received: data.a=369 and data.b=345 \n",
"After both threads finish executing: mydata.a=369 and mydata. b=345\n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Program 14.5, page no. 616"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"from threading import Thread\n",
"import math\n",
"import time\n",
"\n",
"thread_count = 5\n",
"\n",
"thread_id = []\n",
"task = 0\n",
"\n",
"def execute_task():\n",
" global task\n",
" task += 1\n",
" print \"Task %d started.\" %task\n",
" time.sleep(1)\n",
" for i in range(1000000):\n",
" x = math.sqrt(3.1415926)\n",
" print \"Task %d finished\" %task\n",
" \n",
"\n",
"for i in range(thread_count):\n",
" thread_id.append(Thread(target=execute_task))\n",
" thread_id[i].start()\n",
" \n",
"for j in range(thread_count):\n",
" Thread.join(thread_id[j])"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Task 1 started.\n",
"Task 2 started.\n",
"Task 3 started.\n",
"Task 4 started.\n",
"Task 5 started.\n",
"Task 5 finished\n",
"Task 5 finished\n",
"Task 5 finished\n",
"Task 5 finished\n",
"Task 5 finished\n"
]
}
],
"prompt_number": 9
}
],
"metadata": {}
}
]
}
|
