Lesson 23 - Sets.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "True\n",
      "True\n",
      "True\n",
      "False\n",
      "False\n",
      "False\n"
     ]
    }
   ],
   "source": [
    "# in\n",
    "print(\"x\" in [\"x\",\"y\"])\n",
    "print(\"x\" in (\"x\",\"y\"))\n",
    "print(\"x\" in {\"x\",\"y\"})\n",
    "\n",
    "print(\"x\" in [\"y\",\"z\"])\n",
    "print(\"x\" in (\"y\",\"z\"))\n",
    "print(\"x\" in {\"y\",\"z\"})"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{'c', 'a', 'b'}\n",
      "{'c', 'a', 'b'}\n",
      "{'c', 'a', 'b'}\n",
      "{'c', 'a', 'b'}\n"
     ]
    }
   ],
   "source": [
    "# sets\n",
    "set1 = {\"a\",\"b\",\"c\"}\n",
    "set2 = set([\"a\",\"b\",\"c\"])\n",
    "set3 = {\"a\",\"b\",\"c\",\"a\"}\n",
    "set4 = set([\"a\",\"b\",\"c\",\"a\"])\n",
    "\n",
    "print(set1,set2,set3,set4,sep=\"\\n\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "c\n",
      "a\n",
      "b\n"
     ]
    }
   ],
   "source": [
    "# for\n",
    "for item in set1:\n",
    "    print(item)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{'a', 'b', 'c', 'd'}"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# add\n",
    "set1.add(\"d\")\n",
    "set1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "set()"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# clear\n",
    "set2.clear()\n",
    "set2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{'a', 'b', 'c', 'd'}"
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# copy\n",
    "set4 = set1.copy()\n",
    "set4"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "set()\n",
      "{'d'}\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "{'a', 'b', 'c'}"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# difference\n",
    "print(set3.difference(set4))\n",
    "print(set4.difference(set3))\n",
    "set3"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{'c', 'a', 'b'}\n",
      "{'d'}\n"
     ]
    }
   ],
   "source": [
    "# difference_update\n",
    "set4.difference_update(set3)\n",
    "print(set3,set4,sep=\"\\n\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{'b', 'c'}"
      ]
     },
     "execution_count": 10,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# discard\n",
    "set3.discard(\"a\")\n",
    "set3"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{'b', 'c'}"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# intersection\n",
    "set3.intersection(set1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "False\n",
      "False\n"
     ]
    }
   ],
   "source": [
    "# isdisjoint\n",
    "print(set3.isdisjoint(set1))\n",
    "print(set1.isdisjoint(set3))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "True\n",
      "False\n",
      "True\n",
      "True\n"
     ]
    }
   ],
   "source": [
    "# issubset\n",
    "print(set3.issubset(set1))\n",
    "print(set1.issubset(set3))\n",
    "print(set2.issubset(set2))\n",
    "print(set4.issubset(set4))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "False\n",
      "True\n",
      "True\n",
      "True\n"
     ]
    }
   ],
   "source": [
    "# issuperset\n",
    "print(set3.issuperset(set1))\n",
    "print(set1.issuperset(set3))\n",
    "print(set2.issuperset(set2))\n",
    "print(set4.issuperset(set4))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "c\n",
      "{'b'}\n"
     ]
    }
   ],
   "source": [
    "# pop\n",
    "print(set3.pop())\n",
    "print(set3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
    {
     "ename": "KeyError",
     "evalue": "'pop from an empty set'",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mKeyError\u001b[0m                                  Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-16-605b0d9cb57e>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      1\u001b[0m \u001b[1;31m# BUT\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 2\u001b[1;33m \u001b[0mprint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mset2\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mpop\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m      3\u001b[0m \u001b[0mprint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0mset2\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[1;31mKeyError\u001b[0m: 'pop from an empty set'"
     ]
    }
   ],
   "source": [
    "# BUT\n",
    "print(set2.pop())\n",
    "print(set2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {},
   "outputs": [
    {
     "ename": "KeyError",
     "evalue": "'b'",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mKeyError\u001b[0m                                  Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-18-2deda5b9c747>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      1\u001b[0m \u001b[1;31m# remove\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 2\u001b[1;33m \u001b[0mset1\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mremove\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"b\"\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m      3\u001b[0m \u001b[0mset1\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[1;31mKeyError\u001b[0m: 'b'"
     ]
    }
   ],
   "source": [
    "# remove\n",
    "set1.remove(\"b\")\n",
    "set1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{'c', 'd', 'a', 'b'}\n",
      "{'c', 'd', 'a', 'b'}\n"
     ]
    }
   ],
   "source": [
    "# symmetric_difference\n",
    "print(set1.symmetric_difference(set3))\n",
    "print(set3.symmetric_difference(set1))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{'c', 'd', 'a', 'b'}\n",
      "{'b'}\n"
     ]
    }
   ],
   "source": [
    "# symmetric_difference_update\n",
    "set1.symmetric_difference_update(set3)\n",
    "print(set1,set3,sep=\"\\n\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{'d', 'b'}\n",
      "{'d', 'b'}\n",
      "{'b'}\n",
      "{'d'}\n"
     ]
    }
   ],
   "source": [
    "# union\n",
    "print(set3.union(set4))\n",
    "print(set4.union(set3))\n",
    "print(set3,set4,sep=\"\\n\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{'g', 'f', 'd', 'a', 'e', 'c', 'b'}\n"
     ]
    }
   ],
   "source": [
    "# update\n",
    "set1.update([\"d\",\"e\",\"f\",\"g\"])\n",
    "print(set1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "False\n",
      "True\n"
     ]
    }
   ],
   "source": [
    "# practical use\n",
    "def shared_element(list1,list2):\n",
    "    for element1 in list1:\n",
    "        for element2 in list2:\n",
    "            if element1 == element2:\n",
    "                return True\n",
    "    return False\n",
    "print(shared_element([\"a\",\"b\",\"c\"],[\"x\",\"y\",\"z\"]))\n",
    "print(shared_element([\"a\",\"b\",\"x\"],[\"x\",\"y\",\"z\"]))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "False\n",
      "True\n"
     ]
    }
   ],
   "source": [
    "def shared_element(list1,list2):\n",
    "    return not set(list1).isdisjoint(set(list2))\n",
    "print(shared_element([\"a\",\"b\",\"c\"],[\"x\",\"y\",\"z\"]))\n",
    "print(shared_element([\"a\",\"b\",\"x\"],[\"x\",\"y\",\"z\"]))"
   ]
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.8.5"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 4
}