08-内置函数.ipynb

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  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "第1次移动 A -> B\n",
      "第2次移动 A -> C\n",
      "第3次移动 B -> C\n",
      "第4次移动 A -> B\n",
      "第5次移动 C -> A\n",
      "第6次移动 C -> B\n",
      "第7次移动 A -> B\n",
      "第8次移动 A -> C\n",
      "第9次移动 B -> C\n",
      "第10次移动 B -> A\n",
      "第11次移动 C -> A\n",
      "第12次移动 B -> C\n",
      "第13次移动 A -> B\n",
      "第14次移动 A -> C\n",
      "第15次移动 B -> C\n"
     ]
    }
   ],
   "source": [
    "# 汉诺塔\n",
    "\n",
    "i = 0 \n",
    "\n",
    "def hano(n,a,b,c):\n",
    "    global i\n",
    "    if n == 1:\n",
    "        i += 1\n",
    "        print(\"第\"+str(i)+\"次移动\",a,\"->\",c)\n",
    "        return \n",
    "    else:\n",
    "        hano(n-1,a,c,b)\n",
    "        hano(1,a,b,c)\n",
    "        hano(n-1,b,a,c)\n",
    "    return\n",
    "\n",
    "hano(4,\"A\",\"B\",\"C\")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 列表的删除操作\n",
    "\n",
    "    - 注意:python中没有数组这个概念,是使用列表代替的其他语言中的数组形式"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[1, 3, 5, 2, 4]\n",
      "[1, 3, 2, 4]\n",
      "True\n"
     ]
    }
   ],
   "source": [
    "a = [1,3,5,2,4]\n",
    "print(a)\n",
    "id1 = id(a)\n",
    "del a[2]\n",
    "id2 = id(a)\n",
    "print(a)\n",
    "print(id1==id2)\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[1, 2, 3, 4, 'a', 'b', 'c']\n"
     ]
    },
    {
     "ename": "TypeError",
     "evalue": "unsupported operand type(s) for -: 'list' and 'list'",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-10-c22fa8426c64>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m      3\u001b[0m \u001b[0mc\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;34m[\u001b[0m\u001b[0;36m2\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0;36m3\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      4\u001b[0m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0ma\u001b[0m \u001b[0;34m+\u001b[0m \u001b[0mb\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 5\u001b[0;31m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0ma\u001b[0m \u001b[0;34m-\u001b[0m \u001b[0mc\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[0;31mTypeError\u001b[0m: unsupported operand type(s) for -: 'list' and 'list'"
     ]
    }
   ],
   "source": [
    "a = [1,2,3,4]\n",
    "b = ['a','b','c']\n",
    "c = [2,3]\n",
    "print(a + b)\n",
    "print(a - c)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4]\n"
     ]
    }
   ],
   "source": [
    "a = [1,2,3,4]\n",
    "b = ['a','b','c']\n",
    "c = [2,3]\n",
    "print(a * 3 )\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "False\n",
      "True\n"
     ]
    }
   ],
   "source": [
    "print(5 in a)\n",
    "print(\"b\" in b)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "长度 6\n",
      "1\n",
      "4\n",
      "3\n",
      "6\n",
      "4\n",
      "2\n"
     ]
    }
   ],
   "source": [
    "l = [1,4,3,6,4,2]\n",
    "length = len(l)\n",
    "print(\"长度\",length)\n",
    "idx = 0\n",
    "while idx < length:\n",
    "    print(l[idx])\n",
    "    idx += 1\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "a -- 1\n",
      "b -- 2\n"
     ]
    },
    {
     "ename": "ValueError",
     "evalue": "too many values to unpack (expected 2)",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mValueError\u001b[0m                                Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-26-d6b6442cfc8a>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m      1\u001b[0m \u001b[0ma\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;34m[\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m\"a\"\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0;36m1\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m'b'\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0;36m2\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0;34m[\u001b[0m\u001b[0;34m'c'\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0;36m3\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0;36m4\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m]\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 2\u001b[0;31m \u001b[0;32mfor\u001b[0m \u001b[0mk\u001b[0m\u001b[0;34m,\u001b[0m \u001b[0mv\u001b[0m \u001b[0;32min\u001b[0m \u001b[0ma\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m      3\u001b[0m     \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0mk\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0;34m\"--\"\u001b[0m\u001b[0;34m,\u001b[0m\u001b[0mv\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
      "\u001b[0;31mValueError\u001b[0m: too many values to unpack (expected 2)"
     ]
    }
   ],
   "source": [
    "a = [[\"a\",1],['b',2],['c',3,4]]\n",
    "for k, v in a:\n",
    "    print(k,\"--\",v)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "a -- 1\n",
      "b -- 2\n",
      "c -- 3\n"
     ]
    }
   ],
   "source": [
    "a = [[\"a\",1],['b',2],['c',3]]\n",
    "for k, v in a:\n",
    "    print(k,\"--\",v)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# 列表内涵\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34]\n",
      "[2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34]\n"
     ]
    }
   ],
   "source": [
    "a = [x for x in range(1,35)]\n",
    "print(a)\n",
    "b = [x for x in a if x % 2 == 0]\n",
    "print(b)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "3\n"
     ]
    }
   ],
   "source": [
    "print(13 %5)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[111, 211, 121, 131, 112, 212, 122, 132, 113, 213, 123, 133]\n",
      "3 30\n"
     ]
    }
   ],
   "source": [
    "a = [m for m in range(1,4)]\n",
    "b = [m for m in range(10,40) if m % 10 ==0]\n",
    "\n",
    "c = [m + n + l for m in a for n in b for l in range(100,300)  if m + n + l < 220 if l % 100 ==0]\n",
    "print(c)\n",
    "print(len(b),max(b))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['I', 'L', 'o', 'v', 'e', 'W', 'u', 'd', 'a', 'n']\n"
     ]
    }
   ],
   "source": [
    "s = \"ILoveWudan\"\n",
    "print(list(s))"
   ]
  }
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