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-{
- "metadata": {
- "name": "",
- "signature": "sha256:aed4cbb1750b5cf45152f9d0ded2a9f36978f3177285c38b159fb79a8b0d35e4"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
- {
- "cells": [
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h1>Chapter 20: Namespaces and Other Advanced Topics<h1>"
- ]
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 20.1, Page Number:474<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "\n",
- "\n",
- "class CounterNameSpace:\n",
- " upperbound=None\n",
- " lowerbound=None\n",
- " class counter:\n",
- " def __init__(self,n):\n",
- " if n<=CounterNameSpace.upperbound:\n",
- " self.count=n\n",
- " else:\n",
- " self.count=CounterNameSpace.upperbound\n",
- " def reset(self,n):\n",
- " if n<=CounterNameSpace.upperbound:\n",
- " self.count=n\n",
- " def run(self):\n",
- " if self.count>CounterNameSpace.lowerbound:\n",
- " self.count-=1\n",
- " return self.count\n",
- " else:\n",
- " return CounterNameSpace.lowerbound\n",
- " \n",
- "CounterNameSpace.upperbound=100\n",
- "CounterNameSpace.lowerbound=0\n",
- "\n",
- "\n",
- "ob1=CounterNameSpace.counter(10)\n",
- "while True:\n",
- " i=ob1.run()\n",
- " print i,\n",
- " if i<=CounterNameSpace.lowerbound:\n",
- " break \n",
- "print\n",
- "\n",
- "\n",
- "ob2=CounterNameSpace.counter(20)\n",
- "while True:\n",
- " i=ob2.run()\n",
- " print i,\n",
- " if i<=CounterNameSpace.lowerbound:\n",
- " break \n",
- "print\n",
- "\n",
- "\n",
- "ob2.reset(100)\n",
- "CounterNameSpace.lowerbound=90\n",
- "while True:\n",
- " i=ob2.run()\n",
- " print i,\n",
- " if i<=CounterNameSpace.lowerbound:\n",
- " break "
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "9 8 7 6 5 4 3 2 1 0\n",
- "19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0\n",
- "99 98 97 96 95 94 93 92 91 90\n"
- ]
- }
- ],
- "prompt_number": 1
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 20.2, Page Number:476<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- " \n",
- "class CounterNameSpace:\n",
- " upperbound=None\n",
- " lowerbound=None\n",
- " class counter:\n",
- " def __init__(self,n):\n",
- " if n<=c.upperbound:\n",
- " self.count=n\n",
- " else:\n",
- " self.count=c.upperbound\n",
- " def reset(self,n):\n",
- " if n<=c.upperbound:\n",
- " self.count=n\n",
- " def run(self):\n",
- " if self.count>c.lowerbound:\n",
- " self.count-=1\n",
- " return self.count\n",
- " else:\n",
- " return c.lowerbound\n",
- "\n",
- "#Use only upperbound using c\n",
- "c=CounterNameSpace()\n",
- "c.upperbound=100\n",
- "CounterNameSpace.lowerbound=0\n",
- "\n",
- "\n",
- "ob1=CounterNameSpace.counter(10)\n",
- "while True:\n",
- " i=ob1.run()\n",
- " print i,\n",
- " if i<=CounterNameSpace.lowerbound:\n",
- " break \n",
- "print\n",
- "\n",
- "#Now use entre CounterName Space using c\n",
- "\n",
- "ob2=c.counter(20)\n",
- "while True:\n",
- " i=ob2.run()\n",
- " print i,\n",
- " if i<=c.lowerbound:\n",
- " break \n",
- "print\n",
- "\n",
- "\n",
- "ob2.reset(100)\n",
- "c.lowerbound=90\n",
- "while True:\n",
- " i=ob2.run()\n",
- " print i,\n",
- " if i<=c.lowerbound:\n",
- " break "
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "9 8 7 6 5 4 3 2 1 0\n",
- "19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0\n",
- "99 98 97 96 95 94 93 92 91 90\n"
- ]
- }
- ],
- "prompt_number": 2
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 20.3, Page Number:479<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "\n",
- "#User-input\n",
- "print \"Enter a number:\"\n",
- "val= 10.00\n",
- "\n",
- "#Result\n",
- "print \"This is your number:\",val"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter a number:\n",
- "This is your number: 10.0\n"
- ]
- }
- ],
- "prompt_number": 3
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 20.4, Page Number:479<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "\n",
- "import sys\n",
- "\n",
- "#User-input\n",
- "sys.stdout.write(\"Enter a number:\")\n",
- "val= 10.00\n",
- "\n",
- "#Result\n",
- "sys.stdout.write(\"\\nThis is your number: \")\n",
- "sys.stdout.write(str(val))"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter a number:\n",
- "This is your number: 10.0"
- ]
- }
- ],
- "prompt_number": 5
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 20.5, Page Number:479<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "from sys import stdout\n",
- "\n",
- "#User-input\n",
- "stdout.write(\"Enter a number:\")\n",
- "val= 10.00\n",
- "\n",
- "#Result\n",
- "stdout.write(\"\\nThis is your number: \")\n",
- "stdout.write(str(val))"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Enter a number:\n",
- "This is your number: 10.0"
- ]
- }
- ],
- "prompt_number": 6
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 20.6, Page Number:480<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- " \n",
- "def vline(i):\n",
- " for j in xrange(i,0,-1):\n",
- " print \"|\"\n",
- "def hline(i):\n",
- " for j in xrange(i,0,-1):\n",
- " print \"-\",\n",
- " print \n",
- "\n",
- "p=vline #p points to vline\n",
- "p(4) #call vline()\n",
- "\n",
- "p=hline #p now points to hline\n",
- "p(3) #call hline"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "|\n",
- "|\n",
- "|\n",
- "|\n",
- "- - -\n"
- ]
- }
- ],
- "prompt_number": 7
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 20.7, Page Number:482<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "\n",
- "import string\n",
- "\n",
- "def qsort(p):\n",
- " if p == []: \n",
- " return []\n",
- " else:\n",
- " pivot = p[0]\n",
- " lesser = qsort([x for x in p[1:] if x < pivot])\n",
- " greater = qsort([x for x in p[1:] if x >= pivot])\n",
- " return lesser + [pivot] + greater\n",
- " \n",
- "#Variable Declaration \n",
- "str=\"Function pointers provide flexibility.\" \n",
- "\n",
- "#sorting the string\n",
- "str=qsort(str)\n",
- "str=string.join(str)\n",
- "\n",
- "#Result\n",
- "print \"sorted strng: \",str\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "sorted strng: . F b c d e e e f i i i i i i l l n n n o o o p p r r s t t t u v x y\n"
- ]
- }
- ],
- "prompt_number": 8
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 20.8, Page Number:482<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "import string\n",
- "\n",
- "def qsort(p):\n",
- " \"\"\"Quicksort using list comprehensions\"\"\"\n",
- " if p == []: \n",
- " return []\n",
- " else:\n",
- " pivot = p[0]\n",
- " lesser = qsort([x for x in p[1:] if x < pivot])\n",
- " greater = qsort([x for x in p[1:] if x >= pivot])\n",
- " return lesser + [pivot] + greater\n",
- " \n",
- "#Variable Declaration \n",
- "num=[10,4,3,6,5,7,8]\n",
- "\n",
- "#sorting the string\n",
- "num=qsort(num)\n",
- "\n",
- "#Result\n",
- "for i in range(7):\n",
- " print num[i],\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "3 4 5 6 7 8 10\n"
- ]
- }
- ],
- "prompt_number": 9
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 20.9, Page Number:484<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "def space(count,ch=None):\n",
- " if ch==None:\n",
- " for i in xrange(count,0,-1):\n",
- " print '',\n",
- " else:\n",
- " for i in xrange(count,0,-1):\n",
- " print ch,\n",
- " \n",
- "\n",
- "fp1=space\n",
- "fp2=space\n",
- "\n",
- "fp1(22) #outputs 20 spaces\n",
- "print \"|\\n\" \n",
- "\n",
- "fp2(30,'x') #output 30 xs \n",
- "print \"|\\n\"\n",
- " "
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- " |\n",
- "\n",
- "x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x |\n",
- "\n"
- ]
- }
- ],
- "prompt_number": 10
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 20.10, Page Number:485<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "num=None #static variable\n",
- "\n",
- "class ShareVar:\n",
- " def setnum(i=0):\n",
- " global num\n",
- " num=i\n",
- " def shownum(self):\n",
- " global num\n",
- " print num\n",
- " \n",
- "#Variables declaration\n",
- "a=ShareVar()\n",
- "b=ShareVar()\n",
- "\n",
- "a.shownum() #prints None\n",
- "b.shownum() #prints None\n",
- "\n",
- "num=10 #set static num to 10\n",
- "\n",
- "a.shownum() #prints 10\n",
- "b.shownum() #prints 10\n",
- " "
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "None\n",
- "None\n",
- "10\n",
- "10\n"
- ]
- }
- ],
- "prompt_number": 11
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 20.11, Page Number:487<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "class Demo:\n",
- " i=None\n",
- " j=None\n",
- " def geti(self):\n",
- " return self.i\n",
- " def seti(self,x):\n",
- " self.i=x\n",
- " \n",
- "ob=Demo()\n",
- "\n",
- "ob.seti(1900)\n",
- "print ob.geti()\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "1900\n"
- ]
- }
- ],
- "prompt_number": 12
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 20.12, Page Number:488<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "class myclass:\n",
- " def __init__(self,x):\n",
- " self.__a=x\n",
- " def geta(self):\n",
- " return self.__a\n",
- " \n",
- "#Variable declaration\n",
- "ob=myclass(4)\n",
- "\n",
- "#Result\n",
- "print ob.geta()"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "4\n"
- ]
- }
- ],
- "prompt_number": 15
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 20.13, Page Number:489<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "\n",
- "class myclass:\n",
- " def __init__(self,x):\n",
- " self.__a=x\n",
- " def geta():\n",
- " return self.__a\n",
- " \n",
- "ob = myclass(110)"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [],
- "prompt_number": 2
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 20.14, Page Number:490<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "class myclass:\n",
- " def __init__(self,i):\n",
- " self.__num=i\n",
- " def getnum(self):\n",
- " return self.__num\n",
- " \n",
- "#Variable declaration\n",
- "o=myclass(10)\n",
- "\n",
- "print o.getnum() #display 10\n",
- "\n",
- "o=myclass(1000)\n",
- "\n",
- "print o.getnum() #display 1000"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "10\n",
- "1000\n"
- ]
- }
- ],
- "prompt_number": 3
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 20.15, Page Number:491<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "class myclass:\n",
- " def __init__(self,x,y):\n",
- " self.__numA=x\n",
- " self.__numB=y\n",
- " def getnumA(self):\n",
- " return self.__numA\n",
- " def getnumB(self):\n",
- " return self.__numB\n",
- " \n",
- "#Variable declaration\n",
- "ob1=myclass(7,9)\n",
- "ob2=myclass(5,2)\n",
- "\n",
- "#Result\n",
- "print \"Values in ob1 are \",ob1.getnumB(),\"and\",ob1.getnumA()\n",
- "print \"Values in ob2 are \",ob2.getnumB(),\"and\",ob2.getnumA()\n",
- "\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Values in ob1 are 9 and 7\n",
- "Values in ob2 are 2 and 5\n"
- ]
- }
- ],
- "prompt_number": 16
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 20.16, Page Number:492<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "class myclass:\n",
- " def __init__(self,x,y):\n",
- " self.__numA=x\n",
- " self.__numB=y\n",
- " def getnumA(self):\n",
- " return self.__numA\n",
- " def getnumB(self):\n",
- " return self.__numB\n",
- " \n",
- "#Variable declaration\n",
- "ob1=myclass(7,9)\n",
- "ob2=myclass(5,2)\n",
- "\n",
- "#Result\n",
- "print \"Values in ob1 are \",ob1.getnumB(),\"and\",ob1.getnumA()\n",
- "print \"Values in ob2 are \",ob2.getnumB(),\"and\",ob2.getnumA()\n",
- "\n"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Values in ob1 are 9 and 7\n",
- "Values in ob2 are 2 and 5\n"
- ]
- }
- ],
- "prompt_number": 17
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 20.17, Page Number:494<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "def myfunc():\n",
- " print \"This links as a C function.\"\n",
- " \n",
- "myfunc()"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "This links as a C function.\n"
- ]
- }
- ],
- "prompt_number": 18
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 20.18, Page Number:495<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "from ctypes import *\n",
- "\n",
- "class myclass: \n",
- " sum=c_int(0)\n",
- " def sum_it(self,x):\n",
- " for i in range(x+1):\n",
- " self.sum.value+=i\n",
- " fp=sum_it #pointer to function\n",
- "\n",
- "#Variable declaration\n",
- "c=myclass()\n",
- "fp=myclass.sum_it #get address of function\n",
- "dp=pointer(c.sum) #address of data\n",
- "c.fp(7) #compute summation of 7\n",
- "\n",
- "\n",
- "#Result\n",
- "print \"summation of 7 is\",dp[0]\n",
- " "
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "summation of 7 is 28\n"
- ]
- }
- ],
- "prompt_number": 4
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 20.19, Page Number:496<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "from ctypes import *\n",
- "\n",
- "class myclass:\n",
- " sum=c_int(0)\n",
- " def sum_it(self,x): \n",
- " for i in range(x+1):\n",
- " self.sum.value+=i\n",
- " fp=sum_it #pointer to function\n",
- "\n",
- "#Variable declaration\n",
- "d=myclass()\n",
- "c=[d] #ponter to object\n",
- "fp=myclass.sum_it #get address of function\n",
- "dp=pointer(c[0].sum) #get address of data\n",
- "\n",
- "c[0].fp(7) #compute summation of 7\n",
- "\n",
- "\n",
- "#Result\n",
- "print \"summation of 7 is\",dp[0]\n",
- " "
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- " summation of 7 is 28\n"
- ]
- }
- ],
- "prompt_number": 6
- },
- {
- "cell_type": "markdown",
- "metadata": {},
- "source": [
- "<h3>Example 20.20, Page Number:497<h3>"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "\n",
- "class three_d:\n",
- " def __init__(self,a,b,c): #3D coordinates\n",
- " self.x=a\n",
- " self.y=b\n",
- " self.z=c\n",
- " #Display x,y,z coordinates - three_d inserter.\n",
- " def __repr__(self):\n",
- " return str(self.x)+\", \"+str(self.y)+\", \"+str(self.z)+\"\\n\"\n",
- " def __add__(self,op2):\n",
- " if isinstance(op2,int):\n",
- " c=self.x*self.y*self.z+op2\n",
- " return c\n",
- " temp=three_d(self.x+op2.x,self.y+op2.y,self.z+op2.z)\n",
- " return temp\n",
- " \n",
- "a=three_d(1,2,3)\n",
- "b=three_d(2,3,4)\n",
- "\n",
- "print a,b,\n",
- "\n",
- "print b+100 #displays 124 because of conversion to int\n",
- "\n",
- "a=a+b #add two three_d objects - no conversion\n",
- "\n",
- "print a #displays 3,5,7"
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "1, 2, 3\n",
- " 2, 3, 4\n",
- " 124\n",
- "3, 5, 7\n",
- "\n"
- ]
- }
- ],
- "prompt_number": 1
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [],
- "language": "python",
- "metadata": {},
- "outputs": []
- }
- ],
- "metadata": {}
- }
- ]
-} \ No newline at end of file
generated by cgit (git 2.34.1) at 2024-12-19 17:49:27 +0000