week09 P67、P81、P89练习.ipynb · liulinan/python-feinan

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week09 P67、P81、P89练习.ipynb 6.05 KB

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   "source": [
    "------------------\n",
    "# 第九周课后练习\n",
    "* 日期：2022.10.21\n",
    "* 名字：刘黎南\n",
    "------------------"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%% md\n"
    }
   }
  },
  {
   "cell_type": "markdown",
   "source": [
    "## P67练习"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%% md\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 25,
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Don't panic!\n",
      "['D', 'o', 'n', \"'\", 't', ' ', 'p', 'a', 'n', 'i', 'c', '!']\n",
      "['D', 'o', 'n', \"'\", 't', ' ', 'p', 'a', 'n', 'i', 'c', '!']\n",
      "Don't panic!\n",
      "['o', 'n', ' ', 't', 'a', 'p']\n",
      "on tap\n"
     ]
    }
   ],
   "source": [
    "phrase = \"Don't panic!\"\n",
    "plist = list(phrase)\n",
    "print(phrase)\n",
    "print(plist)\n",
    "new_phrase = ''.join(plist)\n",
    "print(plist)\n",
    "print(new_phrase)\n",
    "for i in range(4):\n",
    "        plist.pop()\n",
    "        ## D, o, n, ', t, 空格, p, a, n, i, c,\n",
    "        ## D, o, n, ', t, 空格, p, a, n, i,\n",
    "        ## D, o, n, ', t, 空格, p, a, n,\n",
    "        ## D, o, n, ', t, 空格, p, a,\n",
    "        ## 执行5次，同时在每一次的执行结果都删除最后一个元素\n",
    "\n",
    "        plist.pop(0)\n",
    "        ## o, n, ', t, 空格, p, a\n",
    "\n",
    "plist.remove(\"'\")\n",
    "        ## o, n, t, 空格, p,a\n",
    "\n",
    "plist.extend([plist.pop(),plist.pop()])\n",
    "        ## o, n, t, 空格， （先运行plist.pop(),a p 被删除）\n",
    "        ## o, n, t, 空格, a, p, (再运行plist.extend,把a,  p, 先后添加到末尾)\n",
    "        ## 0  1  2   3   4  5\n",
    "plist.insert(2,plist.pop(3))\n",
    "        ## o, n, 空格, t, a, p,\n",
    "        ## 先运行pop（）把 空格 删除，再运行insert（）在 t 前面添加空格\n",
    "new_phrase = ''.join(plist)\n",
    "print(plist)\n",
    "print(new_phrase)"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "markdown",
   "source": [
    "## P81 练习"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%% md\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Don't panic!\n",
      "['D', 'o', 'n', \"'\", 't', ' ', 'p', 'a', 'n', 'i', 'c', '!']\n",
      "['D', 'o', 'n', \"'\", 't', ' ', 'p', 'a', 'n', 'i', 'c', '!']\n",
      "on tap\n"
     ]
    }
   ],
   "source": [
    "phrase = \"Don't panic!\"\n",
    "plist = list(phrase)\n",
    "print(phrase)\n",
    "print(plist)\n",
    "new_phrase = ''.join(plist[1:3])\n",
    "new_phrase = new_phrase + ''.join([plist[5],plist[4],plist[7],plist[6]])\n",
    "print(plist)\n",
    "print(new_phrase)"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Help on built-in function join:\n",
      "\n",
      "join(iterable, /) method of builtins.str instance\n",
      "    Concatenate any number of strings.\n",
      "    \n",
      "    The string whose method is called is inserted in between each given string.\n",
      "    The result is returned as a new string.\n",
      "    \n",
      "    Example: '.'.join(['ab', 'pq', 'rs']) -> 'ab.pq.rs'\n",
      "\n"
     ]
    }
   ],
   "source": [
    "help(''.join)"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "markdown",
   "source": [
    "## 涉及知识：''.join()的用法\n",
    "### 作用：将可迭代对象拼接成一个大的字符串\n",
    "* join()是str类的一个方法，所以调用时，需要有str类型\n",
    "* join()拼接时第一个和最后一个前面不会添加东西"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%% md\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "abcde\n",
      "<class 'str'>\n"
     ]
    }
   ],
   "source": [
    "li = ['a','b','c','d','e']\n",
    "\n",
    "s1 = ''.join(li)\n",
    "\n",
    "print(s1)\n",
    "print(type(s1))"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "a$b$c$d$e\n",
      "<class 'str'>\n"
     ]
    }
   ],
   "source": [
    "li = ['a','b','c','d','e']\n",
    "\n",
    "s1 = '$'.join(li)\n",
    "print(s1)\n",
    "print(type(s1))"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  },
  {
   "cell_type": "markdown",
   "source": [
    "----------------------"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%% md\n"
    }
   }
  },
  {
   "cell_type": "markdown",
   "source": [
    "# P89列表总结"
   ],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%% md\n"
    }
   }
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "outputs": [],
   "source": [],
   "metadata": {
    "collapsed": false,
    "pycharm": {
     "name": "#%%\n"
    }
   }
  }
 ],
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  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 2
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython2",
   "version": "2.7.6"
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}

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提交于 2022-10-26 15:15 . 课后练习67页、81页

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