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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h1>Chapter 13: Operator Overloading<h1>"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 13.1, Page Number: 300<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"class three_d:\n",
" def __init__(self,i=None,j=None,k=None):\n",
" if i==None:\n",
" self.x=self.y=self.z=0\n",
" else:\n",
" self.x=i\n",
" self.y=j\n",
" self.z=k\n",
" #Overload +\n",
" def __add__(self,op2):\n",
" temp=three_d()\n",
" temp.x=self.x + op2.x #These are integer additions\n",
" temp.y=self.y + op2.y #and the + retains its original\n",
" temp.z=self.z + op2.z #meaning relative to them.\n",
" return temp\n",
" #Overload assignment\n",
" def __assign__(self,op2):\n",
" self.x=op2.x #These are integer assignments\n",
" self.y=op2.y #and the = retains its original \n",
" self.z=op2.z #meaning relative to them\n",
" return self\n",
" #Show x,y,z coordinates\n",
" def show(self):\n",
" print self.x,\",\",self.y,\",\",self.z\n",
" \n",
"#Variable declaration\n",
"a=three_d(1,2,3)\n",
"b=three_d(10,10,10)\n",
"c=three_d()\n",
"\n",
"a.show()\n",
"b.show()\n",
"\n",
"#add a and b together\n",
"c=a+b\n",
"c.show()\n",
"\n",
"#add a,b and c together\n",
"c=a+b+c\n",
"c.show()\n",
"\n",
"#demonstrate multiple assignment\n",
"c=b=a\n",
"c.show()\n",
"b.show()\n",
" \n",
" "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"1 , 2 , 3\n",
"10 , 10 , 10\n",
"11 , 12 , 13\n",
"22 , 24 , 26\n",
"1 , 2 , 3\n",
"1 , 2 , 3\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 13.2, Page Number: 303<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"class three_d:\n",
" def __init__(self,i=None,j=None,k=None):\n",
" if i==None:\n",
" self.x=self.y=self.z=0\n",
" else:\n",
" self.x=i\n",
" self.y=j\n",
" self.z=k\n",
" #Overload +\n",
" def __add__(self,op2):\n",
" temp=three_d()\n",
" temp.x=self.x + op2.x #These are integer additions\n",
" temp.y=self.y + op2.y #and the + retains its original\n",
" temp.z=self.z + op2.z #meaning relative to them.\n",
" return temp\n",
" #Overload assignment\n",
" def __assign__(self,op2):\n",
" self.x=op2.x #These are integer assignments\n",
" self.y=op2.y #and the = retains its original \n",
" self.z=op2.z #meaning relative to them\n",
" return self\n",
" #Overload the increment operator\n",
" def __iadd__(self,op2):\n",
" self.x+=op2\n",
" self.y+=op2\n",
" self.z+=op2\n",
" return self\n",
" #Show x,y,z coordinates\n",
" def show(self):\n",
" print self.x,\",\",self.y,\",\",self.z\n",
" \n",
"a=three_d(1,2,3)\n",
"b=three_d(10,10,10)\n",
"c=three_d()\n",
"\n",
"a.show()\n",
"b.show()\n",
"\n",
"#add a and b together\n",
"c=a+b\n",
"c.show()\n",
"\n",
"#add a,b and c together\n",
"c=a+b+c\n",
"c.show()\n",
"\n",
"#demonstrate multiple assignment\n",
"c=b=a\n",
"c.show()\n",
"b.show()\n",
" \n",
"#Increment c\n",
"c+=1\n",
"c.show()\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"1 , 2 , 3\n",
"10 , 10 , 10\n",
"11 , 12 , 13\n",
"22 , 24 , 26\n",
"1 , 2 , 3\n",
"1 , 2 , 3\n",
"2 , 3 , 4\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 13.3, Page Number: 306<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"class three_d:\n",
" def __init__(self,i=None,j=None,k=None):\n",
" if i==None:\n",
" self.x=self.y=self.z=0\n",
" else:\n",
" self.x=i\n",
" self.y=j\n",
" self.z=k\n",
" #Overload +\n",
" def __add__(self,op2):\n",
" temp=three_d()\n",
" temp.x=self.x + op2.x #These are integer additions\n",
" temp.y=self.y + op2.y #and the + retains its original\n",
" temp.z=self.z + op2.z #meaning relative to them.\n",
" return temp\n",
" #Overload assignment\n",
" def __assign__(self,op2):\n",
" self.x=op2.x #These are integer assignments\n",
" self.y=op2.y #and the = retains its original \n",
" self.z=op2.z #meaning relative to them\n",
" return self\n",
" #Overload the increment operator\n",
" def __iadd__(self,op2):\n",
" self.x+=op2\n",
" self.y+=op2\n",
" self.z+=op2\n",
" return self\n",
" #Show x,y,z coordinates\n",
" def show(self):\n",
" print self.x,\",\",self.y,\",\",self.z\n",
" \n",
"a=three_d(1,2,3)\n",
"b=three_d(10,10,10)\n",
"c=three_d()\n",
"\n",
"a.show()\n",
"b.show()\n",
"\n",
"#add a and b together\n",
"c=a+b\n",
"c.show()\n",
"\n",
"#add a,b and c together\n",
"c=a+b+c\n",
"c.show()\n",
"\n",
"#demonstrate multiple assignment\n",
"c=b=a\n",
"c.show()\n",
"b.show()\n",
" \n",
"#Increment c (prefix)\n",
"c+=1\n",
"c.show()\n",
"\n",
"#Increment c (postfix)\n",
"c+=1\n",
"c.show()\n",
"\n",
"#Implementing prefix\n",
"c+=1\n",
"a=c\n",
"a.show()\n",
"c.show()\n",
"\n",
"#Implementing postfix\n",
"a=c\n",
"a.show()\n",
"c+=1\n",
"c.show()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"1 , 2 , 3\n",
"10 , 10 , 10\n",
"11 , 12 , 13\n",
"22 , 24 , 26\n",
"1 , 2 , 3\n",
"1 , 2 , 3\n",
"2 , 3 , 4\n",
"3 , 4 , 5\n",
"4 , 5 , 6\n",
"4 , 5 , 6\n",
"4 , 5 , 6\n",
"5 , 6 , 7\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 13.4, Page Number: 310<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"class three_d:\n",
" def __init__(self,i=None,j=None,k=None):\n",
" if i==None:\n",
" self.x=self.y=self.z=0\n",
" else:\n",
" self.x=i\n",
" self.y=j\n",
" self.z=k\n",
" #Overload +\n",
" def __add__(self,op2):\n",
" return add(self,op2)\n",
" #Overload assignment\n",
" def __assign__(self,op2):\n",
" self.x=op2.x #These are integer assignments\n",
" self.y=op2.y #and the = retains its original \n",
" self.z=op2.z #meaning relative to them\n",
" return self\n",
" #Show x,y,z coordinates\n",
" def show(self):\n",
" print self.x,\",\",self.y,\",\",self.z\n",
" \n",
"#friending the funcion\n",
"def add(op1,op2):\n",
" temp=three_d()\n",
" temp.x=op1.x + op2.x #These are integer additions\n",
" temp.y=op1.y + op2.y #and the + retains its original\n",
" temp.z=op1.z + op2.z #meaning relative to them.\n",
" return temp\n",
"\n",
"a=three_d(1,2,3)\n",
"b=three_d(10,10,10)\n",
"c=three_d()\n",
"\n",
"a.show()\n",
"b.show()\n",
"\n",
"#add a and b together\n",
"c=a+b\n",
"c.show()\n",
"\n",
"#add a,b and c together\n",
"c=a+b+c\n",
"c.show()\n",
"\n",
"#demonstrate multiple assignment\n",
"c=b=a\n",
"c.show()\n",
"b.show()\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"1 , 2 , 3\n",
"10 , 10 , 10\n",
"11 , 12 , 13\n",
"22 , 24 , 26\n",
"1 , 2 , 3\n",
"1 , 2 , 3\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 13.5, Page Number: 311<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"class CL:\n",
" def __init__(self):\n",
" self.count=0\n",
" def __assign__(self,obj):\n",
" self.count=obj.count\n",
" return self\n",
" def __add__(self,i): \n",
" return add(self,i)\n",
" def __radd__(self,i):\n",
" return radd(self,i)\n",
"\n",
"#This handles ob + int\n",
"def add(ob,i):\n",
" temp=CL()\n",
" temp.count=ob.count+i\n",
" return temp\n",
" \n",
"#This handles int + ob \n",
"def radd(ob,i):\n",
" temp=CL()\n",
" temp.count=i+ob.count\n",
" return temp\n",
"\n",
"#Variable declaration\n",
"o=CL()\n",
"o.count = 10\n",
"\n",
"#Result\n",
"print o.count, #outputs 10\n",
"o=10+o\n",
"print o.count, #outputs 20\n",
"o=o+12\n",
"print o.count #outputs 32\n",
"\n",
"\n",
" "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"10 20 32\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 13.6, Page Number: 314<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"class three_d:\n",
" def __init__(self,i=None,j=None,k=None):\n",
" if i==None:\n",
" self.x=self.y=self.z=0\n",
" else:\n",
" self.x=i\n",
" self.y=j\n",
" self.z=k\n",
" #Overload +\n",
" def __add__(self,op2):\n",
" return add(self,op2)\n",
" #Overload assignment\n",
" def __assign__(self,op2):\n",
" self.x=op2.x #These are integer assignments\n",
" self.y=op2.y #and the = retains its original \n",
" self.z=op2.z #meaning relative to them\n",
" return self\n",
" #Overload the increment operator\n",
" def __iadd__(self,op2):\n",
" return iadd(self,op2)\n",
" #Show x,y,z coordinates\n",
" def show(self):\n",
" print self.x,\",\",self.y,\",\",self.z\n",
"\n",
"#friending the funcion\n",
"def add(op1,op2):\n",
" temp=three_d()\n",
" temp.x=op1.x + op2.x #These are integer additions\n",
" temp.y=op1.y + op2.y #and the + retains its original\n",
" temp.z=op1.z + op2.z #meaning relative to them.\n",
" return temp\n",
"def iadd(op1,op2):\n",
" op1.x+=op2\n",
" op1.y+=op2\n",
" op1.z+=op2\n",
" return op1\n",
" \n",
"a=three_d(1,2,3)\n",
"b=three_d(10,10,10)\n",
"c=three_d()\n",
"\n",
"a.show()\n",
"b.show()\n",
"\n",
"#add a and b together\n",
"c=a+b\n",
"c.show()\n",
"\n",
"#add a,b and c together\n",
"c=a+b+c\n",
"c.show()\n",
"\n",
"#demonstrate multiple assignment\n",
"c=b=a\n",
"c.show()\n",
"b.show()\n",
" \n",
"#Increment c (prefix)\n",
"c+=1\n",
"c.show()\n",
"\n",
"#Increment c (postfix)\n",
"c+=1\n",
"c.show()\n",
"\n",
"#Implementing prefix\n",
"c+=1\n",
"a=c\n",
"a.show()\n",
"c.show()\n",
"\n",
"#Implementing postfix\n",
"a=c\n",
"a.show()\n",
"c+=1\n",
"c.show()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"1 , 2 , 3\n",
"10 , 10 , 10\n",
"11 , 12 , 13\n",
"22 , 24 , 26\n",
"1 , 2 , 3\n",
"1 , 2 , 3\n",
"2 , 3 , 4\n",
"3 , 4 , 5\n",
"4 , 5 , 6\n",
"4 , 5 , 6\n",
"4 , 5 , 6\n",
"5 , 6 , 7\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 13.7, Page Number: 318<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"class sample:\n",
" def __init__(self,ob=0):\n",
" if isinstance(ob,int):\n",
" #Normal constructor\n",
" self.__s=\"\"\n",
" return\n",
" else:\n",
" #Copy constructor\n",
" self.__s=obj._sample__s\n",
" return\n",
" def __del__(self):\n",
" print \"Freeing s\"\n",
" def show(self):\n",
" print self.__s\n",
" def set(self,str):\n",
" self.__s=str\n",
" def __assign__(self,ob): #Overload assignment\n",
" self.s=ob._sample__s\n",
" return self\n",
" \n",
"def input():\n",
" str=sample()\n",
" instr=\"Hello\" #User input\n",
" str.set(instr)\n",
" return str\n",
"\n",
"ob=sample()\n",
"\n",
"#assign returned object to ob\n",
"ob=input()\n",
"\n",
"#Result\n",
"ob.show()\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Freeing s\n",
"Freeing s\n",
"Hello\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 13.8, Page Number: 321<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"class atype:\n",
" def __init__(self):\n",
" self.__a=[]\n",
" for i in range(SIZE):\n",
" self.__a.append(i)\n",
" def a(self,i):\n",
" return self.__a[i]\n",
" \n",
"#Variable declaration\n",
"SIZE=3\n",
"ob=atype()\n",
"\n",
"#Result\n",
"print ob.a(2),\n",
"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"2\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 13.9, Page Number: 322<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"class atype:\n",
" def __init__(self):\n",
" self.__a=[]\n",
" for i in range(SIZE):\n",
" self.__a.append(i)\n",
" def a(self,i,j=None):\n",
" if j==None:\n",
" return self.__a[i]\n",
" else:\n",
" self.__a[i]=j\n",
" \n",
"#Variable declaration\n",
"SIZE=3 \n",
"ob=atype()\n",
"\n",
"print ob.a(2), #displays 2\n",
"\n",
"ob.a(2,25)\n",
"\n",
"print ob.a(2) #now displays 25"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"2 25\n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 13.10, Page Number: 323<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"class atype:\n",
" def __init__(self):\n",
" self.__a=[]\n",
" for i in range(SIZE):\n",
" self.__a.append(i)\n",
" def a(self,i,j=None):\n",
" if (i<0 or i>SIZE-1):\n",
" print \"Index value of\",\n",
" print i,\"is out of bounds.\"\n",
" return\n",
" if j==None:\n",
" return self.__a[i]\n",
" else:\n",
" self.__a[i]=j\n",
" \n",
"#Variable declaration\n",
"SIZE=3 \n",
"ob=atype()\n",
"\n",
"print ob.a(2), #displays 2\n",
"\n",
"ob.a(2,25)\n",
"\n",
"print ob.a(2) #now displays 25\n",
"\n",
"ob.a(44,3) #generates runtime error, 3 out of bounds"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"2 25\n",
"Index value of 44 is out of bounds.\n"
]
}
],
"prompt_number": 9
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 13.11, Page Number: 324<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"\n",
"class three_d:\n",
" def __init__(self,i=None,j=None,k=None):\n",
" if i==None:\n",
" self.x=self.y=self.z=0 #3-D coordinates\n",
" else:\n",
" self.x=i\n",
" self.y=j\n",
" self.z=k\n",
" #Show X,Y,Z coordinates\n",
" def show(self):\n",
" print self.x,\",\",self.y,\",\",self.z\n",
" #Overload ()\n",
" def a(self,a,b,c):\n",
" temp = three_d()\n",
" temp.x=self.x+a\n",
" temp.y=self.y+b\n",
" temp.z=self.z+c\n",
" return temp\n",
" \n",
"#Variable declaration\n",
"ob1=three_d(1,2,3)\n",
"\n",
"ob2=ob1.a(10,11,12) #invoke operator ()\n",
"\n",
"#Result\n",
"print \"ob1: \",\n",
"ob1.show()\n",
"print \"ob2: \",\n",
"ob2.show()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"ob1: 1 , 2 , 3\n",
"ob2: 11 , 13 , 15\n"
]
}
],
"prompt_number": 10
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<h3>Example 13.12, Page Number: 326<h3>"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"class str_type:\n",
" def __init__(self,str=\"\"):\n",
" self.__string=str\n",
" #String concatenation\n",
" def __add__(self,str):\n",
" temp=str_type()\n",
" if isinstance(str,str_type):\n",
" temp.__string=self.__string+str.__string\n",
" else:\n",
" temp.__string=self.__string+str\n",
" return temp\n",
" #String copy\n",
" def __assign__(self,str):\n",
" if isinstance(str,str_type):\n",
" self.__string=str.__string\n",
" else:\n",
" self.__string=str\n",
" return self\n",
" def show_str(self):\n",
" print self.__string\n",
" \n",
"a=str_type(\"Hello \")\n",
"b=str_type(\"There\")\n",
"c=a+b\n",
"c.show_str()\n",
"\n",
"a=str_type(\"to program in because\")\n",
"a.show_str()\n",
"\n",
"b=c=str_type(\"C++ is fun\")\n",
"\n",
"c=c+\" \"+a+\" \"+b\n",
"c.show_str()\n",
"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Hello There\n",
"to program in because\n",
"C++ is fun to program in because C++ is fun\n"
]
}
],
"prompt_number": 12
},
{
"cell_type": "code",
"collapsed": false,
"input": [],
"language": "python",
"metadata": {},
"outputs": []
}
],
"metadata": {}
}
]
}