{
"metadata": {
"name": "",
"signature": "sha256:b5e96d8861a1f6c8945a488114c3e560525b59b81ecaf015f068a3722502da99"
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Hour 12 : Understnading Arrays"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 12.1, Page No 191"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"list_int=range(10)\n",
"\n",
"for i in range(10):\n",
" list_int[i]=i+1\n",
" print \"list_int[\"+str(i)+\"] is initialized with \"+str(list_int[i])+\"\\n\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"list_int[0] is initialized with 1\n",
"\n",
"list_int[1] is initialized with 2\n",
"\n",
"list_int[2] is initialized with 3\n",
"\n",
"list_int[3] is initialized with 4\n",
"\n",
"list_int[4] is initialized with 5\n",
"\n",
"list_int[5] is initialized with 6\n",
"\n",
"list_int[6] is initialized with 7\n",
"\n",
"list_int[7] is initialized with 8\n",
"\n",
"list_int[8] is initialized with 9\n",
"\n",
"list_int[9] is initialized with 10\n",
"\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 12.2, Page No 193"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import sys\n",
"list_int=range(10)\n",
"\n",
"total_byte= sys.getsizeof(int)*10\n",
"\n",
"print \"The size of int is \"+str(sys.getsizeof(int))+\" byte long\"\n",
"print \"The array of 10 ints has total \"+str(total_byte)+\" bytes\"\n",
"print \"The address of the first element: \"+str(id(list_int[0]))\n",
"print \"The address of the last element: \"+str(id(list_int[9]))"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The size of int is 436 byte long\n",
"The array of 10 ints has total 4360 bytes\n",
"The address of the first element: 21357036\n",
"The address of the last element: 21356928\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 12.3, Page No 195"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"list_int=range(10)\n",
"\n",
"for i in range(10):\n",
" list_int[i]=i+1\n",
"\n",
"ptr_int=list_int\n",
"print \"The start address of the array: \"+str(id(ptr_int[0]))\n",
"print \"The value of the first element: \"+str(ptr_int[0])\n",
"ptr_int=id(list_int[0])\n",
"print \"The address of the first element: \"+str(ptr_int)\n",
"print \"The value of the first element: \"+str(list_int[0])"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The start address of the array: 20177376\n",
"The value of the first element: 1\n",
"The address of the first element: 20177376\n",
"The value of the first element: 1\n"
]
}
],
"prompt_number": 8
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 12.4, Page No 196"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"array_ch=['H','e','l','l','o','!','\\0']\n",
"\n",
"for i in range(7):\n",
" print \"array_ch[\"+str(i)+\"] contains: \"+str(array_ch[i])\n",
" \n",
"'''Method I'''\n",
"print \"Put all elements together(Method I):\"\n",
"for ch in array_ch:\n",
" print ch,\n",
"\n",
"''' Method II'''\n",
"print \"\\nPut all elements together(Method II):\"\n",
"print \"\".join(array_ch)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"array_ch[0] contains: H\n",
"array_ch[1] contains: e\n",
"array_ch[2] contains: l\n",
"array_ch[3] contains: l\n",
"array_ch[4] contains: o\n",
"array_ch[5] contains: !\n",
"array_ch[6] contains: \u0000\n",
"Put all elements together(Method I):\n",
"H e l l o ! \u0000 \n",
"Put all elements together(Method II):\n",
"Hello!\u0000\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 12.5, Page No 198"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"array_ch=['C',' ','i','s',' ','p','o','w','e','r','f','u','l','!','\\0']\n",
"\n",
"i=0\n",
"while(array_ch[i]!='\\0'):\n",
" print \"\"+array_ch[i],\n",
" i=i+1\n",
"\n",
"print \"\\n\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"C i s p o w e r f u l ! \n",
"\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 12.6, Page No 200"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"two_dim=[[1,2,3,4,5],[10,20,30,40,50],[100,200,300,400,500]]\n",
"\n",
"for i in range(3):\n",
" print \"\\n\"\n",
" for j in range(5):\n",
" print \"%6u\" % two_dim[i][j],\n",
"print \"\\n\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"\n",
" 1 2 3 4 5 \n",
"\n",
" 10 20 30 40 50 \n",
"\n",
" 100 200 300 400 500 \n",
"\n"
]
}
],
"prompt_number": 17
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 12.7, Page No 202"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import sys\n",
"array_ch=['C',' ','i','s',' ','p','o','w','e','r','f','u','l','!','\\0']\n",
"\n",
"list_int=[[1,1,1],[2,2,8],[3,9,27],[4,16,64],[5,25,125],[6,36,216],[7,49,343]]\n",
"\n",
"print \"The size of array_ch[] is %d bytes.\\n\" %sys.getsizeof(array_ch)\n",
"print \"The size of list_int[][] is %d bytes.\\n\" %sys.getsizeof(list_int)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The size of array_ch[] is 96 bytes.\n",
"\n",
"The size of list_int[][] is 64 bytes.\n",
"\n"
]
}
],
"prompt_number": 2
}
],
"metadata": {}
}
]
}