16_range函数使用.ipynb

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    "# 1. range函数使用"
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      "range(0, 10)\n",
      "[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]\n",
      "[1, 2, 3, 4, 5, 6, 7, 8, 9]\n",
      "[1, 3, 5, 7, 9]\n",
      "False\n",
      "True\n",
      "True\n",
      "range(1, 20)\n",
      "range(1, 101)\n"
     ]
    }
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   "source": [
    "# range()的三种使用方式\n",
    "# 第一种：只有一个参数，括号中只有一个值，默认从0开始，默认相差1为步长\n",
    "r = range(10)\n",
    "print(r)  # range(0,10)\n",
    "print(list(r))  # 用于查看range对象中的整数序列  -->list是列表的意思\n",
    "\n",
    "# 第二种：两个参数，表示开始和结尾，默认步长为1\n",
    "rr = range(1, 10)\n",
    "print(list(rr))\n",
    "\n",
    "# 第三种，三个参数，表示开始、结尾和步长\n",
    "rrr = range(1, 10, 2)\n",
    "print(list(rrr))\n",
    "\n",
    "# 使用in与not in判断整数序列中是否存在指定的整数\n",
    "print(10 in rrr)\n",
    "print(9 in rrr)\n",
    "print(10 not in rrr)\n",
    "\n",
    "# 好处：只存储对应的参数，内存空间相同\n",
    "print(range(1, 20, 1))  # [1...19]\n",
    "print(range(1, 101, 1))  # [1...100]\n",
    "# 只有在用到range对象时，才计算序列中的相关元素"
   ]
  }
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