201611580429 (4).ipynb

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     "text": [
      "请输入一个正整数作为整数个数5\n",
      "请输入一个正整数，以回车结束12\n",
      "请输入一个正整数，以回车结束3\n",
      "请输入一个正整数，以回车结束4\n",
      "请输入一个正整数，以回车结束5\n",
      "请输入一个正整数，以回车结束6\n",
      "和为 30\n"
     ]
    }
   ],
   "source": [
    "#练习2\n",
    "i=0\n",
    "sum=0\n",
    "n=int(input(\"请输入一个正整数作为整数个数\"))\n",
    "while i<n:\n",
    "    m=int(input(\"请输入一个正整数，以回车结束\"))\n",
    "    sum=sum+m\n",
    "    i=i+1\n",
    "print ('和为',sum)"
   ]
  },
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   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "您可以输入“结束”来结束程序\n",
      "结束\n"
     ]
    },
    {
     "ename": "IndexError",
     "evalue": "list assignment index out of range",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mIndexError\u001b[0m                                Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-2-30a9d47db636>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m      4\u001b[0m \u001b[0mprint\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"您可以输入“结束”来结束程序\"\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m      5\u001b[0m \u001b[1;32mwhile\u001b[0m \u001b[1;32mTrue\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m----> 6\u001b[0;31m     \u001b[0ma\u001b[0m\u001b[1;33m[\u001b[0m\u001b[0mi\u001b[0m\u001b[1;33m]\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0minput\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m      7\u001b[0m     \u001b[1;32mif\u001b[0m \u001b[0ma\u001b[0m\u001b[1;33m[\u001b[0m\u001b[0mi\u001b[0m\u001b[1;33m]\u001b[0m \u001b[1;33m==\u001b[0m \u001b[1;34m'结束'\u001b[0m\u001b[1;33m:\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m      8\u001b[0m         \u001b[0msys\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mexit\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;36m0\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
      "\u001b[0;31mIndexError\u001b[0m: list assignment index out of range"
     ]
    }
   ],
   "source": [
    "#练习3\n",
    "import sys\n",
    "i = 0\n",
    "a = list()\n",
    "print(\"您可以输入“结束”来结束程序\")\n",
    "while True:\n",
    "    a[i] = input()\n",
    "    if a[i] == '结束':\n",
    "        sys.exit(0)\n",
    "    i += 1"
   ]
  },
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     "name": "stdout",
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     "text": [
      "1\n",
      "1\n",
      "1\n",
      "6\n"
     ]
    },
    {
     "ename": "SystemExit",
     "evalue": "0",
     "output_type": "error",
     "traceback": [
      "An exception has occurred, use %tb to see the full traceback.\n",
      "\u001b[0;31mSystemExit\u001b[0m\u001b[0;31m:\u001b[0m 0\n"
     ]
    },
    {
     "name": "stderr",
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     "text": [
      "G:\\Python\\lib\\site-packages\\IPython\\core\\interactiveshell.py:2889: UserWarning: To exit: use 'exit', 'quit', or Ctrl-D.\n",
      "  warn(\"To exit: use 'exit', 'quit', or Ctrl-D.\", stacklevel=1)\n"
     ]
    }
   ],
   "source": [
    "#练习4\n",
    "import sys\n",
    "sum = 0\n",
    "factor = 1\n",
    "while True:\n",
    "    n = input()\n",
    "    n = int(n)\n",
    "    if (sum_1 < n) and (sum_2 < (n*n)) :\n",
    "        sys.exit(0)\n",
    "    sum += n\n",
    "    factor *= n"
   ]
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