lectures/lecture02/lecture02.ipynb

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   "source": [
    "# Lecture 02\n",
    "# Going over Loops, Functions, and Objects"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "-1\n",
      "3\n",
      "4\n",
      "6\n",
      "9\n"
     ]
    }
   ],
   "source": [
    "from __future__ import print_function\n",
    "x = [-1, 3, 4,6,9]\n",
    "for i in x:\n",
    "    print(i)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "-1 0 1\n",
      "3 3 2\n",
      "4 8 3\n",
      "6 -2 4\n",
      "9 hi 5\n"
     ]
    }
   ],
   "source": [
    "y = (0,3,8,-2,'hi')\n",
    "z = [1,2,3,4,5]\n",
    "for i,j,k in zip(x,y,z):\n",
    "    print(i,j,k)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "5\n"
     ]
    }
   ],
   "source": [
    "n = len(x)\n",
    "print(n)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "-1\n",
      "3\n",
      "4\n",
      "6\n",
      "9\n"
     ]
    }
   ],
   "source": [
    "for i in range(n):\n",
    "    print(x[i])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "-13\n",
      "-11\n",
      "-9\n",
      "-7\n",
      "-5\n",
      "-3\n",
      "-1\n",
      "1\n"
     ]
    }
   ],
   "source": [
    "for i in range(-13,3,2):\n",
    "    print(i)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "10\n",
      "9\n",
      "8\n",
      "7\n",
      "6\n",
      "5\n",
      "4\n",
      "3\n",
      "2\n",
      "1\n",
      "0\n",
      "-1\n",
      "-2\n",
      "-3\n",
      "-4\n",
      "-5\n",
      "-6\n",
      "-7\n",
      "-8\n",
      "-9\n"
     ]
    }
   ],
   "source": [
    "for i in range(10,-10,-1):\n",
    "    print(i)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "5\n"
     ]
    }
   ],
   "source": [
    "print(n)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "-1\n",
      "3\n",
      "4\n",
      "6\n",
      "9\n"
     ]
    }
   ],
   "source": [
    "for i in range(n):\n",
    "    print(x[i])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "metadata": {},
   "outputs": [
    {
     "ename": "IndexError",
     "evalue": "list index out of range",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mIndexError\u001b[0m                                Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-24-e8c2945f243d>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mx\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;36m5\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[0;31mIndexError\u001b[0m: list index out of range"
     ]
    }
   ],
   "source": [
    "x[5]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 25,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "9"
      ]
     },
     "execution_count": 25,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "x[n-1]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "-5 is negative\n",
      "-5 is less than minus 3\n",
      "my for code block is done, next i\n",
      "-4 is negative\n",
      "-4 is less than minus 3\n",
      "my for code block is done, next i\n",
      "-3 is negative\n",
      "my for code block is done, next i\n",
      "-2 is negative\n",
      "my for code block is done, next i\n",
      "-1 is negative\n",
      "my for code block is done, next i\n",
      "my for code block is done, next i\n",
      "my for code block is done, next i\n",
      "my for code block is done, next i\n",
      "my for code block is done, next i\n",
      "my for code block is done, next i\n",
      "my for code block is done, next i\n"
     ]
    }
   ],
   "source": [
    "for i in range(-5,6):\n",
    "    if i < 0:\n",
    "        print(i, 'is negative')\n",
    "        if i < -3:\n",
    "            print(i, 'is less than minus 3')\n",
    "    print('my for code block is done, next i')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 32,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "-1\n",
      "3\n"
     ]
    }
   ],
   "source": [
    "for i in x:\n",
    "    print(i)\n",
    "    if i > 2:\n",
    "        break"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 35,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Begining first code block with i =  0\n",
      "0 0\n",
      "0 1\n",
      "End of a completer iteration of the inner loop\n",
      "Begining first code block with i =  1\n",
      "1 0\n",
      "1 1\n",
      "End of a completer iteration of the inner loop\n",
      "This will not run until both for loops are complete\n"
     ]
    }
   ],
   "source": [
    "for i in range(2):\n",
    "    print('Begining first code block with i = ',i)\n",
    "    for j in range(2):\n",
    "        print(i,j)\n",
    "    print('End of a completer iteration of the inner loop')\n",
    "# all code from this line on, are after the for loops\n",
    "print(\"This will not run until both for loops are complete\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 38,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "(0, 3, 8, -2, 'hi')\n",
      "0 0\n",
      "1 3\n",
      "2 8\n",
      "3 -2\n",
      "4 hi\n"
     ]
    }
   ],
   "source": [
    "print(y)\n",
    "for i,j in enumerate(y):\n",
    "    print(i,j)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 39,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<enumerate at 0x7f920579ea50>"
      ]
     },
     "execution_count": 39,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "enumerate(x)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 40,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "a = enumerate(x)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 41,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['__class__',\n",
       " '__delattr__',\n",
       " '__doc__',\n",
       " '__format__',\n",
       " '__getattribute__',\n",
       " '__hash__',\n",
       " '__init__',\n",
       " '__iter__',\n",
       " '__new__',\n",
       " '__reduce__',\n",
       " '__reduce_ex__',\n",
       " '__repr__',\n",
       " '__setattr__',\n",
       " '__sizeof__',\n",
       " '__str__',\n",
       " '__subclasshook__',\n",
       " 'next']"
      ]
     },
     "execution_count": 41,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "dir(a)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 42,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "(0, -1)"
      ]
     },
     "execution_count": 42,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "a.next()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 43,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "(1, 3)"
      ]
     },
     "execution_count": 43,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "a.next()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 45,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[0, 3, 8, 15]\n"
     ]
    }
   ],
   "source": [
    "x = [1,2,3,4]\n",
    "y = [i**2 - 1 for i in x]\n",
    "print(y)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 46,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[0, 2, 4, 6, 8, 10, 12, 14, 16, 18]\n"
     ]
    }
   ],
   "source": [
    "z = [i*2 for i in range(10)]\n",
    "print(z)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 47,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[0, 1, 2]\n"
     ]
    }
   ],
   "source": [
    "x = [0,1,2,3,4]\n",
    "y = [i for i in x if i < 3]\n",
    "print(y)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 48,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['__add__', '__class__', '__contains__', '__delattr__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__getnewargs__', '__getslice__', '__gt__', '__hash__', '__init__', '__le__', '__len__', '__lt__', '__mod__', '__mul__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__rmod__', '__rmul__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '_formatter_field_name_split', '_formatter_parser', 'capitalize', 'center', 'count', 'decode', 'encode', 'endswith', 'expandtabs', 'find', 'format', 'index', 'isalnum', 'isalpha', 'isdigit', 'islower', 'isspace', 'istitle', 'isupper', 'join', 'ljust', 'lower', 'lstrip', 'partition', 'replace', 'rfind', 'rindex', 'rjust', 'rpartition', 'rsplit', 'rstrip', 'split', 'splitlines', 'startswith', 'strip', 'swapcase', 'title', 'translate', 'upper', 'zfill']\n"
     ]
    }
   ],
   "source": [
    "k = 'hello world'\n",
    "print(dir(k))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 49,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'Hello world'"
      ]
     },
     "execution_count": 49,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "k.capitalize()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
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