{
"metadata": {
"name": "",
"signature": "sha256:d543de519ea53ce295e62c624f3b779f3394a58f64540659aef438fffab60f98"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"CHAPTER 9: PUPPETTING ON STRINGS"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"EXAMPLE ON PAGE:311"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"name=\"Klinsman\"\n",
"i=0\n",
"while i<=7:\n",
" print \"%c\" % (name[i]), #method of printing without line feed\n",
" i+=1\n",
"print \"\\n\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"K l i n s m a n \n",
"\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"EXAMPLE ON PAGE:311-312"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"name=\"Klinsman \"\n",
"i=0\n",
"while name[i]!=' ':\n",
" print \"%c\" % (name[i]), \n",
" i+=1\n",
"print \"\\n\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" K l i n s m a n \n",
"\n"
]
}
],
"prompt_number": 14
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"EXAMPLE ON PAGE:312"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"name=\"Klinsman \"\n",
"ptr=[]\n",
"ptr=name #store base address of string\n",
"i=0\n",
"while name[i]!=' ':\n",
" print \"%c\" % (ptr[i]), \n",
" i+=1\n",
"print \"\\n\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"K l i n s m a n \n",
"\n"
]
}
],
"prompt_number": 18
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"EXAMPLE ON PAGE:313"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"name=\"Klinsman\"\n",
"print \"%s\" % (name)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Klinsman\n"
]
}
],
"prompt_number": 19
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"EXAMPLE ON PAGE:313"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"print \"Enter your name\"\n",
"name=raw_input()\n",
"print \"Hello %s!\\n\" % (name)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your name\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Debashish\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Hello Debashish!\n",
"\n"
]
}
],
"prompt_number": 20
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"EXAMPLE ON PAGE:314"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"print \"Enter your full name:\"\n",
"name=raw_input()\n",
"print \"Hello!\"\n",
"print name"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your full name:\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"Debashish Roy\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Hello!\n",
"Debashish Roy\n"
]
}
],
"prompt_number": 21
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"EXAMPLE ON PAGE:315"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"str1=\"Hello\"\n",
"s=\"Good Morning\"\n",
"str2=str1 #No error in Python since all variables are by default pointers\n",
"q=s"
],
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"EXAMPLE ON PAGE:316"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"str1=\"Hello\"\n",
"p=\"Hello\"\n",
"str1=\"Bye\" #No error in python\n",
"p=\"Bye\""
],
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"EXAMPLE ON PAGE:317"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"arr=\"Bamboozled\"\n",
"len1=len(arr) #return length of string\n",
"len2=len(\"Humpty Dumpty\")\n",
"print \"string=%s length=%d\\n\" % (arr,len1)\n",
"print \"string=%s length=%d\\n\" % (\"Humpty Dumpty\",len2)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"string=Bamboozled length=10\n",
"\n",
"string=Humpty Dumpty length=13\n",
"\n"
]
}
],
"prompt_number": 22
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"EXAMPLE ON PAGE:317-318"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"def xstrlen(s):\n",
" length=0\n",
" for item in s:\n",
" if s!=\"\\0\":\n",
" length+=1\n",
" return length\n",
"arr=\"Bamboozled\"\n",
"len1=xstrlen(arr) \n",
"len2=xstrlen(\"Humpty Dumpty\")\n",
"print \"string=%s length=%d\\n\" % (arr,len1)\n",
"print \"string=%s length=%d\\n\" % (\"Humpty dumpty\",len2)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"string=Bamboozled length=10\n",
"\n",
"string=Humpty dumpty length=13\n",
"\n"
]
}
],
"prompt_number": 23
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"EXAMPLE ON PAGE:319"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"import copy\n",
"source=\"Sayonara\"\n",
"target=copy.copy(source) #copy string\n",
"print \"source string=%s\\n\" % (source)\n",
"print \"target string=%s\\n\" % (target)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"source string=Sayonara\n",
"\n",
"target string=Sayonara\n",
"\n"
]
}
],
"prompt_number": 24
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"EXAMPLE ON PAGE:319-320"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"def xstrcpy(t,s):\n",
" t=\"\\0\"\n",
" for item in s:\n",
" t=t+str(item)\n",
" return t\n",
"source=\"Sayonara\"\n",
"target=[]\n",
"target=xstrcpy(target,source)\n",
"print \"source string=%s\\n\" % (source)\n",
"print \"target string=%s\\n\" % (target)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"source string=Sayonara\n",
"\n",
"target string=\u0000Sayonara\n",
"\n"
]
}
],
"prompt_number": 25
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"EXAMPLE ON PAGE:321"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"pi=3.14\n",
"print \"Enter radius of circle\"\n",
"r=eval(raw_input())\n",
"a=pi*r*r\n",
"print \"Area of circle=%f\\n\" % (a)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter radius of circle\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"3\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Area of circle=28.260000\n",
"\n"
]
}
],
"prompt_number": 26
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"EXAMPLE ON PAGE:322"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"source=\"Folks!\"\n",
"target=\"Hello\"\n",
"target=target+source\n",
"print \"source string=%s\\n\" % (source)\n",
"print \"target string=%s\\n\" % (target)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"source string=Folks!\n",
"\n",
"target string=HelloFolks!\n",
"\n"
]
}
],
"prompt_number": 27
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"EXAMPLE ON PAGE:322-323"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"string1=\"Jerry\"\n",
"string2=\"Ferry\"\n",
"i=cmp(string1,\"Jerry\")\n",
"j=cmp(string1,string2)\n",
"k=cmp(string1,\"Jerry boy\")\n",
"print \"%d %d %d\\n\" % (i,j,k)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"0 1 -1\n",
"\n"
]
}
],
"prompt_number": 29
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"EXAMPLE ON PAGE:323-324"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"def FOUND():\n",
" return 1\n",
"def NOTFOUND():\n",
" return 0\n",
"masterlist=[\"akshay\",\"parag\",\"raman\",\"srinivas\",\"gopal\",\"rajesh\"]\n",
"print \"Enter your name\"\n",
"yourname=raw_input()\n",
"flag=NOTFOUND()\n",
"for i in range(0,6,1):\n",
" a=cmp(masterlist[i],yourname)\n",
" if a==0:\n",
" print \"Welcome,you can enter the palace\\n\"\n",
" flag=FOUND()\n",
" break\n",
"if flag==NOTFOUND():\n",
" print \"Sorry,you are a trespasser\\n\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter your name\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"gopal\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Welcome,you can enter the palace\n",
"\n"
]
}
],
"prompt_number": 51
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"EXAMPLE ON PAGE:327"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"names=[\"akshay\",\"parag\",\"raman\",\"srinivas\",\"gopal\",\"rajesh\"]\n",
"names = map(bytearray, names)\n",
"print \"Original:%s %s\\n\" % (names[2],names[3])\n",
"s = sorted((names[2], names[3]), key=len)\n",
"for i in range(len(s[1])):\n",
" try:\n",
" t=s[0][i]\n",
" s[0][i]=s[1][i]\n",
" s[1][i]=t\n",
" except IndexError:\n",
" for _ in range(i, len(s[1])):\n",
" #remove the items from the longer string to and append them to the shorter one.\n",
" s[0].append(s[1].pop(i)) \n",
"print \"New:%s %s\\n\" % (names[2],names[3])"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Original:raman srinivas\n",
"\n",
"New:srinivas raman\n",
"\n"
]
}
],
"prompt_number": 46
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"EXAMPLE ON PAGE-328"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"names=[\"akshay\",\"parag\",\"raman\",\"srinivas\",\"gopal\",\"rajesh\"]\n",
"print \"Original:%s %s\\n\" % (names[2],names[3])\n",
"t=names[2]\n",
"names[2]=names[3]\n",
"names[3]=t\n",
"print \"New:%s %s\\n\" % (names[2],names[3])"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Original:raman srinivas\n",
"\n",
"New:srinivas raman\n",
"\n"
]
}
],
"prompt_number": 48
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"EXAMPLE ON PAGE:329"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"names=[]\n",
"for i in range(6):\n",
" names.append(\"\\0\") \n",
"for i in range(0,6,1):\n",
" print \"Enter name\"\n",
" names[i]=raw_input()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter name\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"RAM\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter name\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"GOPAL\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter name\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"PANDEY\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter name\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"GOPU\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter name\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"CHOTU\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter name\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"RADHEY\n"
]
}
],
"prompt_number": 50
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"EXAMPLE ON PAGE:329-330"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"names=[]\n",
"for i in range(0,6):\n",
" names.append('\\0')\n",
"for i in range(0,6,1):\n",
" print \"Enter name\"\n",
" n=raw_input()\n",
" length=len(n)\n",
" import copy\n",
" p=copy.copy(n)\n",
" names[i]=p\n",
"for i in range(0,6,1):\n",
" print \"%s\\n\" % (names[i])"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter name\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"MUKUT\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter name\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"BIHARI\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter name\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"PANDEY\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter name\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"MADHUBALA\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter name\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"PANDEY\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Enter name\n"
]
},
{
"name": "stdout",
"output_type": "stream",
"stream": "stdout",
"text": [
"SUNITA\n"
]
},
{
"output_type": "stream",
"stream": "stdout",
"text": [
"MUKUT\n",
"\n",
"BIHARI\n",
"\n",
"PANDEY\n",
"\n",
"MADHUBALA\n",
"\n",
"PANDEY\n",
"\n",
"SUNITA\n",
"\n"
]
}
],
"prompt_number": 7
}
],
"metadata": {}
}
]
}