https://github.com/taipeipy/taipei-ipy/blob/master/play3.ipynb

Play Python 3

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  "name": "play3"
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 "nbformat": 3,
 "nbformat_minor": 0,
 "worksheets": [
  {
   "cells": [
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "# play3 - Play Python 3 on IPython Notebook\n",
      "\n",
      "Lighting Talk @ [Taipei.py April 2013](http://www.meetup.com/Taipei-py/events/102668252/)\n",
      "\n",
      "* Author: *keitheis*\n",
      "* Licence: [CC0 1.0](http://creativecommons.org/publicdomain/zero/1.0/)\n",
      "\n",
      "Reference the presentation of [Programming with Python - Basic by Mosky](http://www.slideshare.net/moskytw/programming-with-python-basic)\n"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "def hello(name=None):\n",
      "    if name:\n",
      "        return 'Hello, %s!' % name\n",
      "    else:\n",
      "        return 'Hello, Python!'"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 108
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "if __name__ == '__main__':\n",
      "    print(hello(\"Main\"))\n",
      "else:\n",
      "    print(hello())"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Hello, Main!\n"
       ]
      }
     ],
     "prompt_number": 5
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "print('End with a new line char.')\n",
      "print('Print', 'multiple', 'strings.')\n",
      "print('End with a space.',)\n",
      "print() # print a new line char \"\\n\""
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "End with a new line char.\n",
        "Print multiple strings.\n",
        "End with a space.\n",
        "\n"
       ]
      }
     ],
     "prompt_number": 6
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "print('The world is', end=' never end. ')\n",
      "print('a', 'b', 'c', sep=',')"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "The world is never end. a,b,c\n"
       ]
      }
     ],
     "prompt_number": 12
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "### Data types and basic operations on Strings, Numbers and Booleans"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 105
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "3 + 3,  3 - 3,  3 * 3,  3 / 3,  3 % 3"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "pyout",
       "prompt_number": 21,
       "text": [
        "(6, 0, 9, 1.0, 0)"
       ]
      }
     ],
     "prompt_number": 21
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "type(_)  # _ means last output of last input"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "pyout",
       "prompt_number": 16,
       "text": [
        "builtins.tuple"
       ]
      }
     ],
     "prompt_number": 16
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "type(3), type(\"3\"), type(3.0), type((0, 1, 2)), type([0, 1, 2])"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "pyout",
       "prompt_number": 19,
       "text": [
        "(builtins.int, builtins.str, builtins.float, builtins.tuple, builtins.list)"
       ]
      }
     ],
     "prompt_number": 19
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "def get_bmi(weight, height):\n",
      "    bmi = weight / (height / 100) ** 2\n",
      "    return bmi\n",
      "\n",
      "get_bmi(49, 163)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "pyout",
       "prompt_number": 25,
       "text": [
        "18.442545824080696"
       ]
      }
     ],
     "prompt_number": 25
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "type(_)  # practice again"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "pyout",
       "prompt_number": 26,
       "text": [
        "builtins.float"
       ]
      }
     ],
     "prompt_number": 26
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "type(\"3\"), \"->\", int(\"3\"), \"->\", type(int(\"3\"))"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "pyout",
       "prompt_number": 31,
       "text": [
        "(builtins.str, '->', 3, '->', builtins.int)"
       ]
      }
     ],
     "prompt_number": 31
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "type(\"3.3\"), \"->\", float(\"3.3\"), \"->\", type(float(\"3.3\"))"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "pyout",
       "prompt_number": 32,
       "text": [
        "(builtins.str, '->', 3.3, '->', builtins.float)"
       ]
      }
     ],
     "prompt_number": 32
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "None, False, not True, True, not False, not None"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "pyout",
       "prompt_number": 36,
       "text": [
        "(None, False, False, True, True, True)"
       ]
      }
     ],
     "prompt_number": 36
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "bool(None), bool(0), bool(False), bool([]), bool({}), bool(1), bool(True)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "pyout",
       "prompt_number": 112,
       "text": [
        "(False, False, False, False, False, True, True)"
       ]
      }
     ],
     "prompt_number": 112
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "True and True, True or False, False and True, False and False"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "pyout",
       "prompt_number": 113,
       "text": [
        "(True, True, False, False)"
       ]
      }
     ],
     "prompt_number": 113
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "### List and Dictionary"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 104
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "[1, 2, 3, 4, 5, 6, 7]"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "pyout",
       "prompt_number": 40,
       "text": [
        "[1, 2, 3, 4, 5, 6, 7]"
       ]
      }
     ],
     "prompt_number": 40
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "type(_)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "pyout",
       "prompt_number": 41,
       "text": [
        "builtins.list"
       ]
      }
     ],
     "prompt_number": 41
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "[i for i in range(7)]  # List Comprehension"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "pyout",
       "prompt_number": 44,
       "text": [
        "[0, 1, 2, 3, 4, 5, 6]"
       ]
      }
     ],
     "prompt_number": 44
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "7 in range(7), 6 in range(7)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "pyout",
       "prompt_number": 49,
       "text": [
        "(False, True)"
       ]
      }
     ],
     "prompt_number": 49
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "seven_range = range(7)\n",
      "seven_range"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "pyout",
       "prompt_number": 83,
       "text": [
        "range(0, 7)"
       ]
      }
     ],
     "prompt_number": 83
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "seven_range[0], seven_range[1], seven_range[1:3], seven_range[:3]"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "pyout",
       "prompt_number": 84,
       "text": [
        "(0, 1, range(1, 3), range(0, 3))"
       ]
      }
     ],
     "prompt_number": 84
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "for i in seven_range[2:7]:\n",
      "    print(i)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "2\n",
        "3\n",
        "4\n",
        "5\n",
        "6\n"
       ]
      }
     ],
     "prompt_number": 85
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "seven_list = [i for i in range(7)]  # [0, 1, 2, 3, 4, 5, 6], not (0, 1, ..., 6) or\n",
      "\n",
      "seven_list.append('x')  # append to list\n",
      "del seven_list[1]  # remove from list\n",
      "\n",
      "print(seven_list)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "[0, 2, 3, 4, 5, 6, 'x']\n"
       ]
      }
     ],
     "prompt_number": 103
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "len(seven_list), len(seven_list[:3]), len(\"abc\")"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "pyout",
       "prompt_number": 88,
       "text": [
        "(7, 3, 3)"
       ]
      }
     ],
     "prompt_number": 88
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "d = {\"d\": 1, \"e\": 2}\n",
      "print(d)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "{'d': 1, 'e': 2}\n"
       ]
      }
     ],
     "prompt_number": 101
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "len(d)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "pyout",
       "prompt_number": 98,
       "text": [
        "2"
       ]
      }
     ],
     "prompt_number": 98
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "d.keys()"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "pyout",
       "prompt_number": 99,
       "text": [
        "dict_keys(['d', 'e'])"
       ]
      }
     ],
     "prompt_number": 99
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "e = dict(d=1, e=2)\n",
      "print(e)\n",
      "\n",
      "del e['d']\n",
      "print(e)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "{'d': 1, 'e': 2}\n",
        "{'e': 2}\n"
       ]
      }
     ],
     "prompt_number": 102
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "### Flow Control"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 111
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "if d['d'] == 2:\n",
      "    print(\"(d['d'] == 2) is True\")\n",
      "elif d['d'] < 3:\n",
      "    print(\"(d['d'] == 2) is not True\")\n",
      "else:\n",
      "    print(\"whatever\")"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "(d['d'] == 2) is not True\n"
       ]
      }
     ],
     "prompt_number": 121
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "(d['d'] == 2) is not True"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "pyout",
       "prompt_number": 122,
       "text": [
        "True"
       ]
      }
     ],
     "prompt_number": 122
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "for item in seven_list:\n",
      "    print(item)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "0\n",
        "2\n",
        "3\n",
        "4\n",
        "5\n",
        "6\n",
        "x\n"
       ]
      }
     ],
     "prompt_number": 134
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "# enumerate: get index iterated over the list\n",
      "for index, item in enumerate(seven_list):\n",
      "    print(index, item)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "0 0\n",
        "1 2\n",
        "2 3\n",
        "3 4\n",
        "4 5\n",
        "5 6\n",
        "6 x\n"
       ]
      }
     ],
     "prompt_number": 139
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "for key in d:\n",
      "    print(key, ': ', d[key])  # value"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "d :  1\n",
        "e :  2\n"
       ]
      }
     ],
     "prompt_number": 133
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "# loop control: continue, break\n",
      "for i, item in enumerate(seven_range):\n",
      "    if i < 2:\n",
      "        continue\n",
      "    if i > 4:\n",
      "        break\n",
      "    print(item)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "2\n",
        "3\n",
        "4\n"
       ]
      }
     ],
     "prompt_number": 145
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "# How to do nothing but fill the line?\n",
      "if True:\n",
      "    pass"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 147
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "### Error handling"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 148
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "int(\"1.1\")"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "ename": "ValueError",
       "evalue": "invalid literal for int() with base 10: '1.1'",
       "output_type": "pyerr",
       "traceback": [
        "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[0;31mValueError\u001b[0m                                Traceback (most recent call last)",
        "\u001b[0;32m<ipython-input-149-957f95e57e2e>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"1.1\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
        "\u001b[0;31mValueError\u001b[0m: invalid literal for int() with base 10: '1.1'"
       ]
      }
     ],
     "prompt_number": 149
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "try:\n",
      "    int(\"1.1\")\n",
      "except ValueError as value_error:\n",
      "    print(value_error)\n",
      "    print(float(\"1.1\"))\n"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "invalid literal for int() with base 10: '1.1'\n",
        "1.1\n"
       ]
      }
     ],
     "prompt_number": 157
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "### function definition"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 158
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "def lovely_print(a, b, *args, **kwargs):\n",
      "    print(a, b)\n",
      "    print(*args)\n",
      "    print(kwargs)\n",
      "    return a + b"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 188
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "# function keyword expansion\n",
      "lovely_print(1, 2, 3, 4, 5, 6, 7, 8, c='C', d='D', e='E', f='F')"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "1 2\n",
        "3 4 5 6 7 8\n",
        "{'d': 'D', 'e': 'E', 'f': 'F', 'c': 'C'}\n"
       ]
      },
      {
       "output_type": "pyout",
       "prompt_number": 189,
       "text": [
        "3"
       ]
      }
     ],
     "prompt_number": 189
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "my_list = [5, 4, 3]\n",
      "my_dict = {'c': 'C', 'd': 'D'}\n",
      "print(my_list, my_dict)\n",
      "\n",
      "lovely_print(9, 10, *my_list, **my_dict)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "[5, 4, 3] {'d': 'D', 'c': 'C'}\n",
        "9 10\n",
        "5 4 3\n",
        "{'d': 'D', 'c': 'C'}\n"
       ]
      },
      {
       "output_type": "pyout",
       "prompt_number": 192,
       "text": [
        "19"
       ]
      }
     ],
     "prompt_number": 192
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "### Help tools"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [],
     "prompt_number": 193
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "# dir the attributes of an object\n",
      "print(dir(seven_range))"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "['__class__', '__contains__', '__delattr__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__gt__', '__hash__', '__init__', '__iter__', '__le__', '__len__', '__lt__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__reversed__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', 'count', 'index', 'start', 'step', 'stop']\n"
       ]
      }
     ],
     "prompt_number": 216
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [
      "# see document string of an object\n",
      "help(dir)"
     ],
     "language": "python",
     "metadata": {},
     "outputs": [
      {
       "output_type": "stream",
       "stream": "stdout",
       "text": [
        "Help on built-in function dir in module builtins:\n",
        "\n",
        "dir(...)\n",
        "    dir([object]) -> list of strings\n",
        "    \n",
        "    If called without an argument, return the names in the current scope.\n",
        "    Else, return an alphabetized list of names comprising (some of) the attributes\n",
        "    of the given object, and of attributes reachable from it.\n",
        "    If the object supplies a method named __dir__, it will be used; otherwise\n",
        "    the default dir() logic is used and returns:\n",
        "      for a module object: the module's attributes.\n",
        "      for a class object:  its attributes, and recursively the attributes\n",
        "        of its bases.\n",
        "      for any other object: its attributes, its class's attributes, and\n",
        "        recursively the attributes of its class's base classes.\n",
        "\n"
       ]
      }
     ],
     "prompt_number": 217
    },
    {
     "cell_type": "markdown",
     "metadata": {},
     "source": [
      "# \u65b0\u805e\u8207\u516c\u544a\n",
      "\n",
      "## [COSCUP@TICC Taipei.py \u793e\u7fa4\u8b70\u7a0b\u975e\u5e38\u5f37\u529b\u5fb5\u7a3f\u4e2d\uff01](http://www.meetup.com/Taipei-py/messages/boards/thread/33574662/)\n",
      "\n",
      "## [Taipei.py Workshops Pool](http://www.meetup.com/Taipei-py/polls/) - We're having Django Workshop!\n",
      "\n",
      "## [PyCon Taiwan 2013 \u7968\u623f\u71b1](http://registrano.com/events/pycon-taiwan-2013)\uff01\u5834\u5730\u7d44\u3001\u8b70\u7a0b\u7d44\u5fb5\u6c42\u5fd7\u5de5\u4e2d\uff0c\u610f\u8005\u8acb Email\uff1a[organizers@pycon.tw](mailto://organizers@pycon.tw)"
     ]
    },
    {
     "cell_type": "code",
     "collapsed": false,
     "input": [],
     "language": "python",
     "metadata": {},
     "outputs": []
    }
   ],
   "metadata": {}
  }
 ]
}