Python技巧（04.迭代器与生成器）.ipynb

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      "#\n",
      "# Mac OS X Notice\n",
      "#\n",
      "# This file is not used by the host name and address resolution\n",
      "# or the DNS query routing mechanisms used by most processes on\n",
      "# this Mac OS X system.\n",
      "#\n",
      "# This file is automatically generated.\n",
      "#\n",
      "nameserver 114.114.114.114\n",
      "@@@@@@\n",
      "#\n",
      "# Mac OS X Notice\n",
      "#\n",
      "# This file is not used by the host name and address resolution\n",
      "# or the DNS query routing mechanisms used by most processes on\n",
      "# this Mac OS X system.\n",
      "#\n",
      "# This file is automatically generated.\n",
      "#\n",
      "nameserver 114.114.114.114\n"
     ]
    }
   ],
   "source": [
    "with open('/etc/resolv.conf') as f:\n",
    "    while True:\n",
    "        line = next(f, None)\n",
    "        if line is None:\n",
    "            break\n",
    "        print(line, end='')\n",
    "\n",
    "print('@@@@@@')\n",
    "\n",
    "with open('/etc/resolv.conf') as f:\n",
    "    for l in f:\n",
    "        print(l, end='')"
   ]
  },
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      "1\n",
      "2\n",
      "3\n"
     ]
    }
   ],
   "source": [
    "items = [1, 2, 3]\n",
    "it = iter(items)\n",
    "for i in it:\n",
    "    print(i)\n",
    "    \n"
   ]
  }
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