03_exercises.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 3.1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0b110001000100101000\n",
      "1000\n"
     ]
    }
   ],
   "source": [
    "input_number = 201000\n",
    "bin_input = bin(input_number)\n",
    "for index, char in enumerate(bin_input):\n",
    "    if char == '1':\n",
    "        last_one_index = index\n",
    "output = bin_input[last_one_index:]\n",
    "print bin_input\n",
    "print output"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 3.2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "this is a negative number\n"
     ]
    }
   ],
   "source": [
    "input_number = -324\n",
    "if input_number < 0:\n",
    "    print \"this is a negative number\"\n",
    "elif input_number == 0:\n",
    "    print \"this is zero\"\n",
    "else:\n",
    "    print \"this is a positive number\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 3.3"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "maria.ozawa.mp9\n"
     ]
    }
   ],
   "source": [
    "full_file_name = 'maria.ozawa.mp9'\n",
    "for index, char in enumerate(full_file_name):\n",
    "    if char == '.':\n",
    "        last_dot_index = index\n",
    "    else:\n",
    "        last_dot_index = len(full_file_name)\n",
    "file_name = full_file_name[:last_dot_index]\n",
    "print file_name"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 3.4"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "1 5\n",
      "2 6\n",
      "3 7\n",
      "4 8\n",
      "5 9\n",
      "6 10\n",
      "7 11\n",
      "8 12\n",
      "9 13\n",
      "10 14\n",
      "11 15\n"
     ]
    }
   ],
   "source": [
    "lst = range(5,16)\n",
    "for idx, i in enumerate(lst):\n",
    "    print idx + 1, i"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 3.5"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "December 31\n"
     ]
    }
   ],
   "source": [
    "input_month = 12\n",
    "months = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December']\n",
    "days_in_month = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]\n",
    "if input_month in range(13):\n",
    "    print months[input_month-1], days_in_month[input_month-1]\n",
    "else:\n",
    "    print 'Not a month'"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 3.6"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['m', 'e', 'u', 'v', 'i']\n"
     ]
    }
   ],
   "source": [
    "names = \"cho meo ga chuot vit ngan\"\n",
    "print [c for c in names if names.count(c) == 1]"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 3.7"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0 == 0 * 5\n",
      "5 == 1 * 5\n",
      "10 == 2 * 5\n",
      "15 == 3 * 5\n",
      "20 == 4 * 5\n",
      "25 == 5 * 5\n",
      "30 == 6 * 5\n",
      "35 == 7 * 5\n",
      "40 == 8 * 5\n",
      "45 == 9 * 5\n",
      "50 == 10 * 5\n",
      "55 == 11 * 5\n",
      "60 == 12 * 5\n",
      "65 == 13 * 5\n",
      "70 == 14 * 5\n",
      "75 == 15 * 5\n",
      "80 == 16 * 5\n",
      "85 == 17 * 5\n",
      "90 == 18 * 5\n",
      "95 == 19 * 5\n"
     ]
    }
   ],
   "source": [
    "for i in range(100):\n",
    "    if i % 5 == 0:\n",
    "        print str(i) + ' == ' + str(i/5) + ' * 5' "
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 3.8"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255, 270, 285, 300, 315, 330, 345, 360, 375, 390, 405, 420, 435, 450, 465, 480, 495, 510, 525, 540, 555, 570, 585, 600, 615, 630, 645, 660, 675, 690, 705, 720, 735, 750, 765, 780, 795, 810, 825, 840, 855, 870, 885, 900, 915, 930, 945, 960, 975, 990]\n",
      "33165\n"
     ]
    }
   ],
   "source": [
    "lst = [i for i in range(1000) if i % 3 == 0 and i % 5 == 0]\n",
    "print lst\n",
    "print sum(lst)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 3.9"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[[1, 9, 1], [2, 8, 1], [3, 7, 1], [4, 6, 1], [5, 5, 1], [6, 4, 1], [6, 8, 2], [6, 9, 2], [7, 3, 1], [7, 6, 2], [7, 7, 2], [7, 9, 3], [8, 2, 1], [8, 4, 2], [8, 5, 2], [8, 6, 3], [8, 7, 3], [8, 8, 3], [8, 8, 4], [8, 9, 4], [9, 1, 1], [9, 2, 2], [9, 3, 2], [9, 3, 3], [9, 4, 3], [9, 4, 4], [9, 5, 3], [9, 5, 4], [9, 5, 5], [9, 6, 4], [9, 6, 5], [9, 6, 6], [9, 7, 4], [9, 7, 5], [9, 7, 6], [9, 7, 7], [9, 8, 5], [9, 8, 6], [9, 8, 7], [9, 8, 8], [9, 9, 5], [9, 9, 6], [9, 9, 7], [9, 9, 8], [9, 9, 9]]\n"
     ]
    }
   ],
   "source": [
    "print [[a, b, c] for a in range(1, 10) for b in range(1, 10) for c in range(1, 10) if a + b / c == 10]"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 3.10"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "2 3 5 7 11 13 17 19 23 29\n"
     ]
    }
   ],
   "source": [
    "primes = [2]\n",
    "is_prime = False\n",
    "for num in range(2, 50):\n",
    "    for i in range(2, num):\n",
    "        if num % i == 0:\n",
    "            is_prime = False\n",
    "            break\n",
    "        else:\n",
    "            is_prime = True\n",
    "    if is_prime:\n",
    "        primes.append(num)\n",
    "    if len(primes) == 10:\n",
    "        break\n",
    "for i in primes:\n",
    "    print i,"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
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