Solution/Day_02_Solution_v2.ipynb

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    "# [作業目標]\n",
    "\n",
    "1. [簡答題] 請問 type(...) 跟 a.dtype 這兩個語法有什麼不同？\n",
    "\n",
    "```\n",
    "print('type(a): ', type(a))\n",
    "print('a.dtype: ', a.dtype)\n",
    "```\n",
    "\n",
    "2. 請撰寫一個判斷 a 的元素是否等於指定資料型態的函式\n",
    "\n",
    "3. [簡答題] 承上題，請判斷下列三種寫法為何不正確？\n",
    "\n",
    "```\n",
    "def is_dtype(a, t):\n",
    "    return a.dtype is t\n",
    "\n",
    "def is_dtype(a, t):\n",
    "    return type(a) == np.dtype(t)\n",
    "\n",
    "def is_dtype(a, t):\n",
    "    return type(a) is np.dtype(t)\n",
    "```"
   ]
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   "source": [
    "# 作業 "
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 1. [簡答題] 請問 type(...) 跟 a.dtype 這兩個 function 有什麼不同？\n",
    "\n",
    "```\n",
    "print('type(a): ', type(a))\n",
    "print('a.dtype: ', a.dtype)\n",
    "```\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
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     "name": "stdout",
     "output_type": "stream",
     "text": [
      "type(a):  <class 'numpy.ndarray'>\n",
      "a.dtype:  int64\n"
     ]
    }
   ],
   "source": [
    "import numpy as np\n",
    "\n",
    "a = np.random.randint(10, size=6) \n",
    "\n",
    "print('type(a): ', type(a))\n",
    "print('a.dtype: ', a.dtype)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'\\ntype(a) 是回傳 a 變數的型態；a.dtype 是回傳 a 陣列中的元素型態。\\n'"
      ]
     },
     "execution_count": 3,
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   ],
   "source": [
    "'''\n",
    "type(a) 是回傳 a 變數的型態；a.dtype 是回傳 a 陣列中的元素型態。\n",
    "'''"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 2. 請撰寫一個判斷 a 的元素是否等於指定資料型態的函式，並且通過測試。\n",
    "\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "# 記得先 Import 正確的套件\n",
    "\n",
    "import numpy as np\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "colab": {},
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   "outputs": [],
   "source": [
    "# 參考解答\n",
    "\n",
    "def is_dtype(a, t):\n",
    "    return a.dtype is np.dtype(t)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "True\n",
      "True\n",
      "True\n"
     ]
    }
   ],
   "source": [
    "a = np.random.randint(10, size=6) \n",
    "\n",
    "# 測試一\n",
    "print(is_dtype(a, 'int')) # True\n",
    "\n",
    "# 測試二\n",
    "print(is_dtype(a, np.int)) # True\n",
    "\n",
    "# 測試三\n",
    "print(is_dtype(a, np.dtype('int'))) # True"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 3. [簡答題] 承上題，請判斷下列三種寫法為何不正確？\n",
    "\n",
    "```\n",
    "def is_dtype(a, t):\n",
    "    return a.dtype is t\n",
    "\n",
    "def is_dtype(a, t):\n",
    "    return type(a) == np.dtype(t)\n",
    "\n",
    "def is_dtype(a, t):\n",
    "    return type(a) is np.dtype(t)\n",
    "```"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'\\ntype() 是檢查變數的型態，而不是元素的型態； is 相對 == 更嚴格，一定要型態正確才會回傳 True。\\n'"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "'''\n",
    "type() 是檢查變數的型態，而不是元素的型態； is 相對 == 更嚴格，一定要型態正確才會回傳 True。\n",
    "'''"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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