05 - Dictionaries.ipynb

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    "Dictionaries"
   ]
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   "source": [
    "1.) Constructing a Dictionary\n",
    "2.) Accessing objects from a dictionary\n",
    "3.) Nesting Dictionaries\n",
    "4.) Basic Dictionary Methods"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "<class 'dict'>\n"
     ]
    }
   ],
   "source": [
    "#creating dictionary\n",
    "my_dict = {'key1':'value1','key2':'value2'}\n",
    "marks = {'1' :10 , '2' :23 ,'3' :21}\n",
    "price = {\"Pen\" :20 ,\"Pencil\" :5}\n",
    "print(type(price))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'value1'"
      ]
     },
     "execution_count": 2,
     "metadata": {},
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   "source": [
    "my_dict = {'key1':'value1','key2':'value2'}\n",
    "my_dict['key1']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "#calling through keys\n",
    "my_dict['key2']  =\"Python\" \n",
    "my_dict"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "price[\"Pencil\"]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "demo_dict = { 'a' : '10' , 'b' :20}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "demo_dict['a'] =16\n",
    "demo_dict"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "#creating nested dictionary\n",
    "my_dict = {'key1':123,\n",
    "           'key2':[12,23,33],\n",
    "           'key3':{'a' : '10' ,\n",
    "                   'b' :20}}\n",
    "my_dict['key3']['b']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "#Q : Print Daman\n",
    "\n",
    "my_dict = {'key1':123,\n",
    "           'key2':[12,23,33],\n",
    "           'key\\n3':{'a' : '10' , \n",
    "                     'b' :[2 , 4 ,\"Daman\"]}}\n",
    "\n",
    "type(my_dict['key\\n3']['b'][-1])\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "my_dict.keys()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "my_dict['key2'][1]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "#playing with nested dictionary\n",
    "my_dict['key3']\n",
    "my_dict['key3'][0]\n",
    "my_dict['key3'][0].upper()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Create a typical dictionary\n",
    "d = {'key1':1,'key2':2,'key3':3}\n",
    "# Method to return a list of all keys d.keys()\n",
    "d.keys()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Method to grab all values\n",
    "d.values()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Method to return tuples of all items\n",
    "d.items()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "dict_keys(['c1', 'c2', 'c3'])\n",
      "dict_values([13, 15, 17])\n",
      "dict_items([('c1', 13), ('c2', 15), ('c3', 17)])\n"
     ]
    }
   ],
   "source": [
    "cell = { 'c1' : 13 , 'c2' :15 , 'c3' :17} \n",
    "print(cell.keys())\n",
    "print(cell.values())\n",
    "print(cell.items())"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
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   "outputs": [],
   "source": [
    "cell['c1']"
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   "source": []
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   "execution_count": null,
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   "cell_type": "code",
   "execution_count": null,
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   "source": [
    "sample = {'key1':10 , 'key2' :20}\n",
    "sample['key1']\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "#Q - create a dict storing name and roll no of 3 students\n",
    "#roll no - key - 1,2,3\n",
    "#name -value - a,b , c\n",
    "\n",
    "#dict -->curly brackets\n",
    "#keys -->string\n",
    "\n",
    "student = {'1' :\"a\" ,\n",
    "           '2' :'b',\n",
    "           '3' :'c'}\n",
    "#Print the name of roll no 2\n",
    "student['2']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "#Q - create a dict storing no of reps u have done for each exercise in gym today\n",
    "#name of exercise - key - a , b , c\n",
    "#no of reps -value - 1 , 2 ,3\n",
    "\n",
    "#dict -->curly brackets\n",
    "#keys -->string\n",
    "gym = {'a' :1,\n",
    "       'b' :2,\n",
    "       'c' :3}"
   ]
  },
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   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "r= [1,2,3,4,5]\n",
    "m = [12,13,18,20,7]\n",
    "\n",
    "#Task - Print the marks of roll no 4\n",
    "ind = r.index(4)\n",
    "print(m[ind])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "dicti = {1:12,2:13,3:18,4:20,5:7}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "dicti[4]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "ename": "TypeError",
     "evalue": "'str' object does not support item assignment",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-5-bdbe9f495bd0>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      1\u001b[0m \u001b[0ms\u001b[0m\u001b[1;33m=\u001b[0m \u001b[1;34m\"Daman\"\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 2\u001b[1;33m \u001b[0ms\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;36m3\u001b[0m\u001b[1;33m]\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;34m\"P\"\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m: 'str' object does not support item assignment"
     ]
    }
   ],
   "source": [
    "\n",
    "s= \"Daman\"\n",
    "s[3] = \"P\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [],
   "source": [
    "l = [1,4,2,6]\n",
    "l[3] = \"Daman\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[1, 4, 2, 'Daman']"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "l"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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