Dict

Author: sarincr

Diff for: 08.Dictionary .ipynb

@@ -374,6 +374,172 @@
     "print(empty_dict.keys())"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 25,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Before dictionary is updated\n",
+      "dict_keys(['name', 'age'])\n",
+      "\n",
+      "After dictionary is updated\n",
+      "dict_keys(['name', 'age', 'salary'])\n"
+     ]
+    }
+   ],
+   "source": [
+    "person = {'name': 'Phill', 'age': 22, }\n",
+    "\n",
+    "print('Before dictionary is updated')\n",
+    "keys = person.keys()\n",
+    "print(keys)\n",
+    "\n",
+    "person.update({'salary': 3500.0})\n",
+    "print('\\nAfter dictionary is updated')\n",
+    "print(keys)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 26,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "dict_items([('apple', 2), ('orange', 3), ('grapes', 4)])\n"
+     ]
+    }
+   ],
+   "source": [
+    "sales = { 'apple': 2, 'orange': 3, 'grapes': 4 }\n",
+    "\n",
+    "print(sales.items())"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 27,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Original items: dict_items([('apple', 2), ('orange', 3), ('grapes', 4)])\n",
+      "Updated items: dict_items([('orange', 3), ('grapes', 4)])\n"
+     ]
+    }
+   ],
+   "source": [
+    "sales = { 'apple': 2, 'orange': 3, 'grapes': 4 }\n",
+    "\n",
+    "items = sales.items()\n",
+    "print('Original items:', items)\n",
+    "\n",
+    "del[sales['apple']]\n",
+    "print('Updated items:', items)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 28,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "{'orange': 3, 'grapes': 4}"
+      ]
+     },
+     "execution_count": 28,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "sales"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 29,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Name:  Phill\n",
+      "Salary:  None\n",
+      "Salary:  0.0\n"
+     ]
+    }
+   ],
+   "source": [
+    "person = {'name': 'Phill', 'age': 22}\n",
+    "\n",
+    "print('Name: ', person.get('name'))\n",
+    "\n",
+    "print('Salary: ', person.get('salary'))\n",
+    "\n",
+    "print('Salary: ', person.get('salary', 0.0))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 30,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "{'name': 'Phill', 'age': 22}"
+      ]
+     },
+     "execution_count": 30,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "person"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 31,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Salary:  None\n"
+     ]
+    },
+    {
+     "ename": "KeyError",
+     "evalue": "'salary'",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
+      "\u001b[0;31mKeyError\u001b[0m                                  Traceback (most recent call last)",
+      "\u001b[0;32m<ipython-input-31-b00495ba314f>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m      1\u001b[0m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m'Salary: '\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mperson\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mget\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m'salary'\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 2\u001b[0;31m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mperson\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m'salary'\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
+      "\u001b[0;31mKeyError\u001b[0m: 'salary'"
+     ]
+    }
+   ],
+   "source": [
+    "print('Salary: ', person.get('salary'))\n",
+    "print(person['salary'])"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,