Python 基础.ipynb

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     "data": {
      "text/plain": [
       "['False',\n",
       " 'None',\n",
       " 'True',\n",
       " 'and',\n",
       " 'as',\n",
       " 'assert',\n",
       " 'async',\n",
       " 'await',\n",
       " 'break',\n",
       " 'class',\n",
       " 'continue',\n",
       " 'def',\n",
       " 'del',\n",
       " 'elif',\n",
       " 'else',\n",
       " 'except',\n",
       " 'finally',\n",
       " 'for',\n",
       " 'from',\n",
       " 'global',\n",
       " 'if',\n",
       " 'import',\n",
       " 'in',\n",
       " 'is',\n",
       " 'lambda',\n",
       " 'nonlocal',\n",
       " 'not',\n",
       " 'or',\n",
       " 'pass',\n",
       " 'raise',\n",
       " 'return',\n",
       " 'try',\n",
       " 'while',\n",
       " 'with',\n",
       " 'yield']"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import keyword\n",
    "keyword.kwlist"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "2\n"
     ]
    }
   ],
   "source": [
    "a=1+1\n",
    "print(a)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Hello, Python!\n"
     ]
    }
   ],
   "source": [
    "# 这是我写的第一个Python程序，\n",
    "# 主要用来输出Hello\n",
    "# Author:LincolnWung\n",
    "# Date:2018年11月03日10:55:46\n",
    "# 2018-11-03 10:55:55\n",
    "\n",
    "'''\n",
    "\n",
    "我是一个多行注释\n",
    "在这里面可以写很多的东西\n",
    "\n",
    "一个的编程都需要写一些注释\n",
    "\n",
    "\n",
    "'''\n",
    "\n",
    "\n",
    "print (\"Hello, Python!\") "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "True\n"
     ]
    }
   ],
   "source": [
    "if True:\n",
    "    print (\"True\")\n",
    "else:\n",
    "    print (\"False\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Answer\n",
      "True\n",
      "False\n"
     ]
    }
   ],
   "source": [
    "\n",
    "if True:\n",
    "    print (\"Answer\")\n",
    "    print (\"True\")\n",
    "else:\n",
    "    print (\"Answer\")\n",
    "print (\"False\")    # 缩进不一致，会导致运行错误"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "今天天气很冷啊\n"
     ]
    }
   ],
   "source": [
    "str = \"今天\"+\\\n",
    "      \"天气很冷啊\"\n",
    "print(str)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "paragraph = \"\"\"这是一个段落，\n",
    "可以由多行组成\"\"\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "#!/usr/bin/python3\n",
    " \n",
    "str='Runoob'\n",
    " \n",
    "print(str)                 # 输出字符串\n",
    "\n",
    "\n",
    "\n",
    "\n",
    "print(str[0:-1])           # 输出第一个到倒数第二个的所有字符\n",
    "\n",
    "\n",
    "\n",
    "\n",
    "\n",
    "print(str[0])              # 输出字符串第一个字符\n",
    "\n",
    "\n",
    "\n",
    "print(str[2:5])            # 输出从第三个开始到第五个的字符\n",
    "print(str[2:])             # 输出从第三个开始的后的所有字符\n",
    "print(str * 2)             # 输出字符串两次\n",
    "print(str + '你好')        # 连接字符串\n",
    " \n",
    "print('------------------------------')\n",
    " \n",
    "print('hello\\nrunoob')      # 使用反斜杠(\\)+n转义特殊字符\n",
    "print(r'hello\\nrunoob')     # 在字符串前面添加一个 r，表示原始字符串，不会发生转义"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Runoob\n",
      "noo\n"
     ]
    }
   ],
   "source": [
    "str='Runoob'\n",
    " \n",
    "print(str)                 # 输出字符串\n",
    "\n",
    "\n",
    "print(str[2:5])            # 输出从第三个开始到第五个的字符"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "a\tb "
     ]
    }
   ],
   "source": [
    "#!/usr/bin/python3\n",
    " \n",
    "x=\"a\"\n",
    "y=\"b\"\n",
    "# 换行输出\n",
    "#print( x )\n",
    "#print( y )\n",
    " \n",
    "#print('---------')\n",
    "# 不换行输出\n",
    "print( x, end=\"\\t\" )\n",
    "print( y, end=\" \" )\n",
    "# print()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 27,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "================Python import mode==========================\n",
      "命令行参数为:\n",
      "/Users/lw/anaconda3/lib/python3.7/site-packages/ipykernel_launcher.py\n",
      "-f\n",
      "/Users/lw/Library/Jupyter/runtime/kernel-536d53be-b3c1-440f-a267-2948e554bcc1.json\n",
      "\n",
      " python 路径为 ['', '/Users/lw/WorkSpace/Anaconda', '/Users/lw/anaconda3/lib/python37.zip', '/Users/lw/anaconda3/lib/python3.7', '/Users/lw/anaconda3/lib/python3.7/lib-dynload', '/Users/lw/anaconda3/lib/python3.7/site-packages', '/Users/lw/anaconda3/lib/python3.7/site-packages/aeosa', '/Users/lw/anaconda3/lib/python3.7/site-packages/IPython/extensions', '/Users/lw/.ipython']\n"
     ]
    }
   ],
   "source": [
    "import sys\n",
    "print('================Python import mode==========================');\n",
    "print ('命令行参数为:')\n",
    "for i in sys.argv:\n",
    "    print (i)\n",
    "print ('\\n python 路径为',sys.path)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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