{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {
    "autoscroll": false,
    "collapsed": true,
    "ein.tags": "worksheet-0",
    "slideshow": {
     "slide_type": "-"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "H\n",
      "H\n",
      "e\n",
      "l\n",
      "l\n",
      "o\n",
      " \n",
      "w\n",
      "o\n",
      "r\n",
      "l\n",
      "d\n"
     ]
    }
   ],
   "source": [
    "a = 'Hello world'\n",
    "print(a[0])\n",
    "\n",
    "i = 0\n",
    "while  i < len(a):\n",
    "       print(a[i])\n",
    "       i = i + 1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "autoscroll": false,
    "collapsed": false,
    "ein.tags": "worksheet-0",
    "slideshow": {
     "slide_type": "-"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "h\n",
      "X hello\n"
     ]
    }
   ],
   "source": [
    "a = 'hello'\n",
    "b = a\n",
    "print(a[0])\n",
    "a = 'X'\n",
    "print(a, b)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {
    "autoscroll": false,
    "collapsed": false,
    "ein.tags": "worksheet-0",
    "slideshow": {
     "slide_type": "-"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "01234 | 56789\n",
      "1 2 3 4\n"
     ]
    }
   ],
   "source": [
    "a = '0123456789'\n",
    "\n",
    "mid = round(len(a)/2)\n",
    "\n",
    "first = slice(0, mid )\n",
    "second = slice(mid, len(a))\n",
    "\n",
    "print( a[first], '|', a[second])\n",
    "print(1,2,3,4)\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 36,
   "metadata": {
    "autoscroll": false,
    "collapsed": false,
    "ein.tags": "worksheet-0",
    "slideshow": {
     "slide_type": "-"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "9\n"
     ]
    }
   ],
   "source": [
    "a = '0123456789'\n",
    "s = slice(-1, len(a))\n",
    "\n",
    "print( a[s] )"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 44,
   "metadata": {
    "autoscroll": false,
    "collapsed": false,
    "ein.tags": "worksheet-0",
    "slideshow": {
     "slide_type": "-"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "hello\n"
     ]
    }
   ],
   "source": [
    "a = 'hello'\n",
    "\n",
    "print(a[ slice(-1000, 1000) ])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 53,
   "metadata": {
    "autoscroll": false,
    "collapsed": false,
    "ein.tags": "worksheet-0",
    "slideshow": {
     "slide_type": "-"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "13579\n"
     ]
    }
   ],
   "source": [
    "a = '0123456789'\n",
    "s = slice(1, 10, 2)\n",
    "\n",
    "print( a[s] )"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 62,
   "metadata": {
    "autoscroll": false,
    "collapsed": false,
    "ein.tags": "worksheet-0",
    "slideshow": {
     "slide_type": "-"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "9876543210\n",
      "9876543210\n"
     ]
    }
   ],
   "source": [
    "a = '0123456789'\n",
    "\n",
    "s = slice(-1, -11, -1)\n",
    "print( a[s] )\n",
    "\n",
    "print(a[slice(-1, -11, -1)])\n",
    "\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "autoscroll": false,
    "collapsed": false,
    "ein.tags": "worksheet-0",
    "slideshow": {
     "slide_type": "-"
    }
   },
   "outputs": [],
   "source": [
    "a = '0123456789'\n",
    "\n",
    "print(a[slice(0, len(a))])\n",
    "print(a[0:len(a)])\n",
    "\n",
    "print(a[slice(0, 2)])\n",
    "print(a[ :2 ])\n",
    "\n",
    "print(a[slice(0, len(a), 2)])\n",
    "print(a[ ::2 ])\n",
    "\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 93,
   "metadata": {
    "autoscroll": false,
    "collapsed": false,
    "ein.tags": "worksheet-0",
    "slideshow": {
     "slide_type": "-"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "None\n",
      "ello\n",
      "hello\n"
     ]
    }
   ],
   "source": [
    "xxx = None\n",
    "print(xxx)\n",
    "\n",
    "a = 'hello'\n",
    "\n",
    "print( a[ slice(1, None)  ])\n",
    "print( a[ None:None:None  ])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 101,
   "metadata": {
    "autoscroll": false,
    "collapsed": false,
    "ein.tags": "worksheet-0",
    "slideshow": {
     "slide_type": "-"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Нельзя делить на ноль!!!! >:-( \n",
      "FINISH\n"
     ]
    }
   ],
   "source": [
    "a = 10\n",
    "b = 0\n",
    "\n",
    "op = '/'\n",
    "\n",
    "if op == '+':\n",
    "   print(a + b)\n",
    "elif op == '-':\n",
    "   print(a - b)\n",
    "elif op == '*':\n",
    "   print(a * b)\n",
    "elif op == '/' and b == 0:\n",
    "   print('Нельзя делить на ноль!!!! >:-( ')\n",
    "elif op == '/':\n",
    "   print(a / b)\n",
    "else:\n",
    "    print('incorrect operator')\n",
    "print('FINISH')\n",
    "\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 103,
   "metadata": {
    "autoscroll": false,
    "collapsed": false,
    "ein.tags": "worksheet-0",
    "slideshow": {
     "slide_type": "-"
    }
   },
   "outputs": [],
   "source": [
    "if ...:\n",
    "   ...\n",
    "elif ...:\n",
    "   ...\n",
    "elif ...:\n",
    "   ...\n",
    "else:\n",
    "   ...\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 153,
   "metadata": {
    "autoscroll": false,
    "collapsed": false,
    "ein.tags": "worksheet-0",
    "slideshow": {
     "slide_type": "-"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Yes\n",
      "Yes\n",
      "Yes\n"
     ]
    }
   ],
   "source": [
    "a = 1 < 10\n",
    "b = 1 > 10\n",
    "c = 100 - 10 == 90\n",
    "\n",
    "# dfkjsdlkfjlsdkjflksdjfl kdsjf lsdkj\n",
    "# sldkfjlsdkfjlsdkjflksjdf\n",
    "# sdf;sdkf\n",
    "# sdf;llksdjfsd\n",
    "# fsd;fllkjsdf;lkjsdf\n",
    "if a or b and c:\n",
    "   print('Yes')\n",
    "   \n",
    "if (a or b) and c:\n",
    "   print('Yes')\n",
    "   \n",
    "if a or (b and c):\n",
    "   print('Yes')\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 120,
   "metadata": {
    "autoscroll": false,
    "collapsed": false,
    "ein.tags": "worksheet-0",
    "slideshow": {
     "slide_type": "-"
    }
   },
   "outputs": [],
   "source": [
    "x = 'hello'\n",
    "\n",
    "if '':\n",
    "   print('string is not empty')\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 137,
   "metadata": {
    "autoscroll": false,
    "collapsed": false,
    "ein.tags": "worksheet-0",
    "slideshow": {
     "slide_type": "-"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "True True\n",
      "0.0\n",
      "e h\n"
     ]
    }
   ],
   "source": [
    "print( True  == 1, False == 0 )\n",
    "print((1 * 3 - 1 / 2) * 0 )\n",
    "a = 'hello'\n",
    "print( a[True], a[False] )"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 154,
   "metadata": {
    "autoscroll": false,
    "collapsed": false,
    "ein.tags": "worksheet-0",
    "slideshow": {
     "slide_type": "-"
    }
   },
   "outputs": [],
   "source": [
    "a = 1\n",
    "# ........................................................\n",
    "a = a + 10 # я сделал это ибо!\n",
    "# print(a)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "ein.tags": "worksheet-0",
    "slideshow": {
     "slide_type": "-"
    }
   },
   "source": [
    "<stron>\n",
    "\n",
    "<!--\n",
    "\n",
    "hello\n",
    "\n",
    "-->\n",
    "\n",
    "</strong>"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "ein.tags": "worksheet-0",
    "slideshow": {
     "slide_type": "-"
    }
   },
   "source": [
    "h1 {\n",
    "   // color:red;\n",
    "   /*\n",
    "   border-width: 1px;\n",
    "   background: black;\n",
    "   */\n",
    "\n",
    "}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 166,
   "metadata": {
    "autoscroll": false,
    "collapsed": false,
    "ein.tags": "worksheet-0",
    "slideshow": {
     "slide_type": "-"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "q\n",
      "w\n",
      "e\n",
      "r\n",
      "t\n",
      "y\n",
      "u\n",
      "i\n",
      "o\n",
      "a\n",
      "s\n",
      "d\n",
      "f\n",
      "13 25\n"
     ]
    }
   ],
   "source": [
    "a = 'qwertyuioasdfghjklzxcvbnm'\n",
    "i = 0\n",
    "while i < len(a):\n",
    "      if a[i] == 'g':\n",
    "         result = i\n",
    "         break\n",
    "      print(a[i])\n",
    "      i = i + 1\n",
    "print(result, len(a))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 173,
   "metadata": {
    "autoscroll": false,
    "collapsed": false,
    "ein.tags": "worksheet-0",
    "slideshow": {
     "slide_type": "-"
    }
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0\n",
      "1\n"
     ]
    }
   ],
   "source": [
    "i = 0\n",
    "while i < 2:\n",
    "    print(i)\n",
    "    if i == 1:\n",
    "      break\n",
    "    i = i + 1\n",
    "else:\n",
    "    print('hello')"
   ]
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3",
   "name": "python3"
  },
  "name": "Untitled.ipynb"
 },
 "nbformat": 4,
 "nbformat_minor": 2
}