24_09_2018.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Recursion"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "When a method calls itself"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "5040\n"
     ]
    }
   ],
   "source": [
    "def recursion(n):\n",
    "    if n>0:\n",
    "        return n * recursion(n-1)\n",
    "    else:\n",
    "        return 1\n",
    "print(recursion(7))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "5040\n"
     ]
    }
   ],
   "source": [
    "def recursion(n):\n",
    "    if n==0:\n",
    "        return 1\n",
    "    else:\n",
    "        return n * recursion(n-1)\n",
    "print(recursion(7))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# English Ruler "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "def draw_line(tick_length,tick_label = ''):\n",
    "    line = '-' * tick_length\n",
    "    if tick_label:\n",
    "        line += ' ' + tick_label\n",
    "    print(line)\n",
    "def draw_interval(center_length):\n",
    "    if center_length > 0:\n",
    "        draw_interval(center_length - 1)\n",
    "        draw_line(center_length) \n",
    "        draw_interval(center_length - 1)\n",
    "def draw_ruler(num_inches, major_length): \n",
    "    draw_line(major_length, '0' )\n",
    "    for j in range(1, 1 + num_inches):\n",
    "        draw_interval(major_length - 1)\n",
    "        draw_line(major_length, str(j)) \n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "---- 0\n",
      "-\n",
      "--\n",
      "-\n",
      "---\n",
      "-\n",
      "--\n",
      "-\n",
      "---- 1\n",
      "-\n",
      "--\n",
      "-\n",
      "---\n",
      "-\n",
      "--\n",
      "-\n",
      "---- 2\n"
     ]
    }
   ],
   "source": [
    "draw_ruler(2,4)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [],
   "source": [
    "import os"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "os.terminal_size(columns=120, lines=30)"
      ]
     },
     "execution_count": 12,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "os.get_terminal_size()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
    {
     "ename": "SyntaxError",
     "evalue": "invalid syntax (<ipython-input-16-e35cbeb1c43d>, line 1)",
     "output_type": "error",
     "traceback": [
      "\u001b[1;36m  File \u001b[1;32m\"<ipython-input-16-e35cbeb1c43d>\"\u001b[1;36m, line \u001b[1;32m1\u001b[0m\n\u001b[1;33m    os.path.isdir(C:\\Users\\Family\\Dropbox\\FAST NU 2017\\Fall 2018\\DSA Theory\\DSA\\Materials\\LPTHW.pdf,/)\u001b[0m\n\u001b[1;37m                   ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m invalid syntax\n"
     ]
    }
   ],
   "source": [
    "os.path.isdir(C:\\Users\\Family\\Dropbox\\FAST NU 2017\\Fall 2018\\DSA Theory\\DSA\\Materials\\LPTHW.pdf,/)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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