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{
"metadata": {
"name": "Chapter 16"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": "<h1>Chapter 16: Templates<h1>"
},
{
"cell_type": "markdown",
"metadata": {},
"source": "<h3>Example 16.1, Page Number: 376<h3>"
},
{
"cell_type": "code",
"collapsed": false,
"input": "'''Implementation of templates'''\n\n#The concept of template in in-built in python,hence this is a function template\ndef swapargs(a,b):\n temp=a[0]\n a[0]=b[0]\n b[0]=temp\n\n#Variable declaration\ni=[10]\nj=[20]\nx=[10.1]\ny=[23.3]\na=['x']\nb=['z']\n\nprint \"Original i, j: \",i[0],j[0]\nprint \"Original x,y: \",x[0],y[0]\nprint \"Original a,b: \",a[0],b[0]\n\nswapargs(i,j) #swap integers\nswapargs(x,y) #swap floats\nswapargs(a,b) #swap chars\n\n#Result\nprint \"Swapped i, j: \",i[0],j[0]\nprint \"Swapped x,y: \",x[0],y[0]\nprint \"Swapped a,b: \",a[0],b[0]",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Original i, j: 10 20\nOriginal x,y: 10.1 23.3\nOriginal a,b: x z\nSwapped i, j: 20 10\nSwapped x,y: 23.3 10.1\nSwapped a,b: z x\n"
}
],
"prompt_number": 1
},
{
"cell_type": "markdown",
"metadata": {},
"source": "<h3>Example 16.2, Page Number: 378<h3>"
},
{
"cell_type": "code",
"collapsed": false,
"input": "'''Template for two generic types'''\n\ndef myfunc(x,y):\n print x,y\n \nmyfunc(10,\"hi\")\nmyfunc(0.23,10L)",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "10 hi\n0.23 10\n"
}
],
"prompt_number": 3
},
{
"cell_type": "markdown",
"metadata": {},
"source": "<h3>Example 16.3, Page Number: 379<h3>"
},
{
"cell_type": "code",
"collapsed": false,
"input": "'''Overloading generic functions'''\n\ndef swapargs(a,b):\n if isinstance(a[0],int): #integer version\n temp=a[0]\n a[0]=b[0]\n b[0]=temp\n print \"Inside swapargs int specialization.\"\n else: #generic version\n temp=a[0]\n a[0]=b[0]\n b[0]=temp\n print \"Inside template swapargs.\"\n\n#Variable declaration\ni=[10]\nj=[20]\nx=[10.1]\ny=[23.3]\na=['x']\nb=['z']\n\nprint \"Original i, j: \",i[0],j[0]\nprint \"Original x,y: \",x[0],y[0]\nprint \"Original a,b: \",a[0],b[0]\n\nswapargs(i,j) #calls explicitly overloaded swapargs()\nswapargs(x,y) #calls generic swapargs()\nswapargs(a,b) #calls generic swapargs()\n\n#Result\nprint \"Swapped i, j: \",i[0],j[0]\nprint \"Swapped x,y: \",x[0],y[0]\nprint \"Swapped a,b: \",a[0],b[0]",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Original i, j: 10 20\nOriginal x,y: 10.1 23.3\nOriginal a,b: x z\nInside swapargs int specialization.\nInside template swapargs.\nInside template swapargs.\nSwapped i, j: 20 10\nSwapped x,y: 23.3 10.1\nSwapped a,b: z x\n"
}
],
"prompt_number": 2
},
{
"cell_type": "markdown",
"metadata": {},
"source": "<h3>Example 16.4, Page Number: 381<h3>"
},
{
"cell_type": "code",
"collapsed": false,
"input": "'''Overload a function template declaration'''\n\n#Function version of f() template\ndef f(a,b=None):\n if(b==None): #First version of f()\n print \"Inside f(X a)\"\n else: #Second version of f()\n print \"Inside f(X a, Y b)\"\n \nf(10) #calls f(X)\nf(10,20) #calls f(X,Y)",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Inside f(X a)\nInside f(X a, Y b)\n"
}
],
"prompt_number": 4
},
{
"cell_type": "markdown",
"metadata": {},
"source": "<h3>Example 16.5, Page Number: 382<h3>"
},
{
"cell_type": "code",
"collapsed": false,
"input": "'''Implementing templates in python'''\n\n#Display data specified number of times.\ndef repeat(data,times):\n while times:\n print data\n times-=1\n \nrepeat(\"This is a test\",3)\nrepeat(100,5)\nrepeat(99.0/2, 4)\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "This is a test\nThis is a test\nThis is a test\n100\n100\n100\n100\n100\n49.5\n49.5\n49.5\n49.5\n"
}
],
"prompt_number": 5
},
{
"cell_type": "markdown",
"metadata": {},
"source": "<h3>Example 16.6, Page Number: 383<h3>"
},
{
"cell_type": "code",
"collapsed": false,
"input": "'''A generic version of myabs()'''\n\ndef myabs(val):\n if val<0:\n return -val\n else:\n return val\n\n#Result\nprint myabs(-10)\nprint myabs(-10.0)\nprint myabs(-10L)\nprint myabs(-10.0)\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "10\n10.0\n10\n10.0\n"
}
],
"prompt_number": 6
},
{
"cell_type": "markdown",
"metadata": {},
"source": "<h3>Example 16.7, Page Number: 385<h3>"
},
{
"cell_type": "code",
"collapsed": false,
"input": "'''Implementing a generic queue class'''\n\ndef SIZE():\n return 100\nclass queue:\n def __init__(self):\n self.q=[]\n self.sloc=self.rloc=0\n #Put an object into the queue\n def qput(self,i):\n if self.sloc==SIZE():\n print \"Queue is full.\"\n return\n self.sloc+=1\n self.q.append(i)\n #Get an object from the queue.\n def qget(self):\n if self.rloc==self.sloc:\n print \"Queue Underflow.\"\n return\n a=self.rloc\n self.rloc+=1\n return self.q[a]\n \n#Create two integer queues\na=queue()\nb=queue()\na.qput(10)\nb.qput(19)\na.qput(20)\nb.qput(1)\n\nprint a.qget(),\nprint a.qget(),\nprint b.qget(),\nprint b.qget()\n\n#Create two double queues\nc=queue()\nd=queue()\nc.qput(10.12)\nd.qput(19.99)\nc.qput(-20.0)\nd.qput(0.986)\n\nprint c.qget(),\nprint c.qget(),\nprint d.qget(),\nprint d.qget()\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "10 20 19 1\n10.12 -20.0 19.99 0.986\n"
}
],
"prompt_number": 7
},
{
"cell_type": "markdown",
"metadata": {},
"source": "<h3>Example 16.8, Page Number: 387<h3>"
},
{
"cell_type": "code",
"collapsed": false,
"input": "'''Two generic types in a class'''\n\nclass myclass:\n def __init__(self,a,b):\n self.__i=a\n self.__j=b\n def show(self):\n print self.__i,self.__j\n\nob1=myclass(10,0.23)\nob2=myclass('X',\"This is a test\")\n\n#Result\nob1.show() #Show int,double\nob2.show() #Show char.char*\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "10 0.23\nX This is a test\n"
}
],
"prompt_number": 8
},
{
"cell_type": "markdown",
"metadata": {},
"source": "<h3>Example 16.9, Page Number: 388<h3>"
},
{
"cell_type": "code",
"collapsed": false,
"input": "'''A generic safe array example'''\n\n#Defining constant\ndef SIZE():\n return 10\n\nclass atype:\n def __init__(self):\n self.a=[]\n for i in range(SIZE()):\n self.a.append(i)\n #Implementing the [] overloading\n def op1(self,i,j):\n if (i<0 or i>=SIZE()):\n print \"\\nIndex value of \",\n print i,\" is out-of-bounds.\"\n return \n self.a[i]=j\n def op2(self,i):\n if (i<0 or i>SIZE()-1):\n print \"\\nIndex value of \",\n print i,\" is out-of-bounds.\"\n return\n return self.a[i]\n \n#Variable declaration\nintob=atype()\ndoubleob=atype()\n \nprint \"Integer array: \",\nfor i in range(SIZE()):\n intob.op1(i,i)\nfor i in range(SIZE()):\n print intob.op2(i),\n \nprint \"\"\n\nprint \"Double array: \",\nfor i in range(SIZE()):\n doubleob.op1(i,float(i)/3)\nfor i in range(SIZE()):\n print doubleob.op2(i),\n \nintob.op1(12,100)",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Integer array: 0 1 2 3 4 5 6 7 8 9 \nDouble array: 0.0 0.333333333333 0.666666666667 1.0 1.33333333333 1.66666666667 2.0 2.33333333333 2.66666666667 3.0 \nIndex value of 12 is out-of-bounds.\n"
}
],
"prompt_number": 1
},
{
"cell_type": "markdown",
"metadata": {},
"source": "<h3>Example 16.10, Page Number: 389<h3>"
},
{
"cell_type": "code",
"collapsed": false,
"input": "'''Implementing non-type template arguments'''\n\nclass atype:\n def __init__(self,size):\n self.a=[]\n self.size=size\n for i in range(size):\n self.a.append(i)\n #Implementing the [] overloading\n def op1(self,i,j):\n if (i<0 or i>self.size-1):\n print \"\\nIndex value of \",\n print i,\" is out-of-bounds.\"\n return\n self.a[i]=j\n def op2(self,i):\n if (i<0 or i>self.size-1):\n print \"\\nIndex value of \",\n print i,\" is out-of-bounds.\"\n return\n return self.a[i]\n \n#Variable declaration\nintob=atype(10)\ndoubleob=atype(15)\n \nprint \"Integer array: \",\nfor i in range(10):\n intob.op1(i,i)\nfor i in range(10):\n print intob.op2(i),\n \nprint \"\"\n\nprint \"Double array: \",\nfor i in range(15):\n doubleob.op1(i,float(i)/3)\nfor i in range(15):\n print doubleob.op2(i),\n \nintob.op1(12,100) #generates runtime error\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Integer array: 0 1 2 3 4 5 6 7 8 9 \nDouble array: 0.0 0.333333333333 0.666666666667 1.0 1.33333333333 1.66666666667 2.0 2.33333333333 2.66666666667 3.0 3.33333333333 3.66666666667 4.0 4.33333333333 4.66666666667 \nIndex value of 12 is out-of-bounds.\n"
}
],
"prompt_number": 2
},
{
"cell_type": "markdown",
"metadata": {},
"source": "<h3>Example 16.11, Page Number: 391<h3>"
},
{
"cell_type": "code",
"collapsed": false,
"input": "'''A generic safe array example with default arguments'''\n\nclass atype:\n def __init__(self,size=10):\n self.a=[]\n for i in range(size):\n self.a.append(i)\n #Implementing the [] overloading\n def op1(self,i,j):\n if (i<0 and i>SIZE()-1):\n print \"Index value of \"\n print i,\" is out-of-bounds.\"\n exit(1)\n self.a[i]=j\n def op2(self,i):\n if (i<0 and i>SIZE()-1):\n print \"Index value of \"\n print i,\" is out-of-bounds.\"\n exit()\n return self.a[i]\n \n#Variable declaration\nintob=atype(100)\ndoubleob=atype()\ndefarray=atype()\n \nprint \"Integer array: \",\nfor i in range(100):\n intob.op1(i,i)\nfor i in range(100):\n print intob.op2(i),\n \nprint \"\"\n\nprint \"Double array: \",\nfor i in range(10):\n doubleob.op1(i,float(i)/3)\nfor i in range(10):\n print doubleob.op2(i),\n \nprint \"\"\n\nprint \"Defarray array: \",\nfor i in range(10):\n doubleob.op1(i,i)\nfor i in range(10):\n print doubleob.op2(i),\n\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Integer array: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 \nDouble array: 0.0 0.333333333333 0.666666666667 1.0 1.33333333333 1.66666666667 2.0 2.33333333333 2.66666666667 3.0 \nDefarray array: 0 1 2 3 4 5 6 7 8 9\n"
}
],
"prompt_number": 3
},
{
"cell_type": "markdown",
"metadata": {},
"source": "<h3>Example 16.12, Page Number: 393<h3>"
},
{
"cell_type": "code",
"collapsed": false,
"input": "'''Demonstrate class specialization'''\n\nclass myclass:\n def __init__(self,a):\n if isinstance(a,int):\n print \"Inside myclass<int>specialization\"\n self.__x=a*a\n else:\n print \"Inside generic myclass\"\n self.__x=a\n def getx(self):\n return self.__x\n \nd=myclass(10.1)\nprint \"double: \",d.getx(),\"\\n\"\n\ni=myclass(5)\nprint \"int: \",i.getx()\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": "Inside generic myclass\ndouble: 10.1 \n\nInside myclass<int>specialization\nint: 25\n"
}
],
"prompt_number": 4
},
{
"cell_type": "code",
"collapsed": false,
"input": "",
"language": "python",
"metadata": {},
"outputs": []
}
],
"metadata": {}
}
]
}
|
