{"id":2204,"date":"2026-04-25T21:56:32","date_gmt":"2026-04-25T13:56:32","guid":{"rendered":"http:\/\/www.preluna.xyz\/?p=2204"},"modified":"2026-04-26T18:35:23","modified_gmt":"2026-04-26T10:35:23","slug":"join-%e8%bf%9e%e6%8e%a5%e5%ad%97%e7%ac%a6%e3%80%81center-%e5%b1%85%e4%b8%ad%e5%a1%ab%e5%85%85","status":"publish","type":"post","link":"http:\/\/www.preluna.xyz\/index.php\/2026\/04\/25\/join-%e8%bf%9e%e6%8e%a5%e5%ad%97%e7%ac%a6%e3%80%81center-%e5%b1%85%e4%b8%ad%e5%a1%ab%e5%85%85\/preluna\/text\/","title":{"rendered":"join() \u8fde\u63a5\u5b57\u7b26\u3001center() \u5c45\u4e2d\u586b\u5145"},"content":{"rendered":"\n
\"\"<\/div><\/figure>\n\n\n\n

1. \u9898\u76ee\u8003\u70b9<\/h2>\n\n\n\n

\u8fd9\u9053\u9898\u4e3b\u8981\u8003\uff1a<\/p>\n\n\n\n

\u5b57\u7b26\u4e32\u62fc\u63a5\u3001\u5217\u8868\u5b58\u50a8\u6bcf\u4e00\u884c\u3001join()<\/code> \u8fde\u63a5\u5b57\u7b26\u3001center()<\/code> \u5c45\u4e2d\u586b\u5145\u3001\u5faa\u73af\u6784\u9020\u89c4\u5f8b\u3001\u4e0a\u4e0b\u5bf9\u79f0\u56fe\u5f62\u6253\u5370\u3002<\/p>\n\n\n\n

\u5b83\u4e0d\u662f\u96be\u5728\u8bed\u6cd5\uff0c\u800c\u662f\u96be\u5728\u770b\u51fa\u56fe\u6848\u89c4\u5f8b\u3002<\/p>\n\n\n\n

\n\n\n\n

2. \u5ba1\u9898<\/h2>\n\n\n\n

\u9898\u76ee\u7ed9\u4f60\u4e00\u4e2a\u6574\u6570 size<\/code>\uff0c\u8ba9\u4f60\u751f\u6210\u4e00\u4e2a\u5b57\u6bcd rangoli \u56fe\u6848\u3002<\/p>\n\n\n\n

\u4f8b\u5982 size = 3<\/code> \u65f6\uff0c\u7528\u5230\u5b57\u6bcd\uff1a<\/p>\n\n\n\n

a b c\n<\/code><\/pre>\n\n\n\n
\u4f46\u662f\u56fe\u6848\u4ece\u5916\u5230\u5185\u662f\uff1a<\/p>\n\n\n\n
----c----\n--c-b-c--\nc-b-a-b-c\n--c-b-c--\n----c----\n<\/code><\/pre>\n\n\n\n
\u6240\u4ee5\u6211\u4eec\u8981\u6ce8\u610f\u51e0\u4e2a\u4fe1\u606f\uff1a<\/p>\n\n\n\n
\u7b2c\u4e00\uff0c\u6700\u5916\u5c42\u662f\u7b2c size<\/code> \u4e2a\u5b57\u6bcd\u3002
size = 3<\/code>\uff0c\u6700\u5916\u5c42\u662f c<\/code>\u3002
size = 5<\/code>\uff0c\u6700\u5916\u5c42\u662f e<\/code>\u3002<\/p>\n\n\n\n
\u7b2c\u4e8c\uff0c\u4e2d\u95f4\u4e00\u5b9a\u662f a<\/code>\u3002<\/p>\n\n\n\n
\u7b2c\u4e09\uff0c\u56fe\u6848\u4e0a\u4e0b\u5bf9\u79f0\u3002
\u4e5f\u5c31\u662f\u8bf4\uff0c\u53ea\u8981\u6211\u4eec\u80fd\u751f\u6210\u4e0a\u534a\u90e8\u5206\u52a0\u4e2d\u95f4\u884c\uff0c\u4e0b\u534a\u90e8\u5206\u53ef\u4ee5\u76f4\u63a5\u5012\u8fc7\u6765\u590d\u7528\u3002<\/p>\n\n\n\n
\u7b2c\u56db\uff0c\u6bcf\u4e00\u884c\u5de6\u53f3\u4e5f\u5bf9\u79f0\u3002
\u4f8b\u5982\uff1a<\/p>\n\n\n\n
c-b-a-b-c\n<\/code><\/pre>\n\n\n\n
\u5de6\u8fb9\u662f\uff1a<\/p>\n\n\n\n
c-b\n<\/code><\/pre>\n\n\n\n
\u4e2d\u95f4\u662f\uff1a<\/p>\n\n\n\n
a\n<\/code><\/pre>\n\n\n\n
\u53f3\u8fb9\u662f\uff1a<\/p>\n\n\n\n
b-c\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
3. \u601d\u8def\u63d0\u793a<\/h2>\n\n\n\n
\u5148\u4e0d\u8981\u6025\u7740\u5199\u4ee3\u7801\u3002\u6211\u4eec\u5148\u627e\u89c4\u5f8b\u3002<\/p>\n\n\n\n
\u5bf9\u4e8e size = 3<\/code>\uff0c\u6838\u5fc3\u5185\u5bb9\u5176\u5b9e\u662f\u8fd9\u4e09\u884c\uff1a<\/p>\n\n\n\n
c\nc-b-c\nc-b-a-b-c\n<\/code><\/pre>\n\n\n\n
\u7136\u540e\u518d\u628a\u5b83\u4eec\u5c45\u4e2d\u8865 -<\/code>\uff0c\u6700\u540e\u518d\u955c\u50cf\u51fa\u4e0b\u534a\u90e8\u5206\u3002<\/p>\n\n\n\n
\u6240\u4ee5\u505a\u9898\u65b9\u5411\u662f\uff1a<\/p>\n\n\n\n
\u7b2c\u4e00\u6b65\uff0c\u51c6\u5907\u5b57\u6bcd\u8868\uff1a<\/p>\n\n\n\n
letters = \"abcdefghijklmnopqrstuvwxyz\"\n<\/code><\/pre>\n\n\n\n
\u7b2c\u4e8c\u6b65\uff0c\u751f\u6210\u4ece\u9876\u90e8\u5230\u4e2d\u95f4\u7684\u6bcf\u4e00\u884c\u3002<\/p>\n\n\n\n
\u5bf9\u4e8e size = 3<\/code>\uff1a<\/p>\n\n\n\n
i = 2 -> c\ni = 1 -> c-b-c\ni = 0 -> c-b-a-b-c\n<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u7684 i<\/code> \u53ef\u4ee5\u7406\u89e3\u6210\u201c\u8fd9\u4e00\u884c\u4e2d\u95f4\u6700\u5c0f\u7684\u5b57\u6bcd\u4e0b\u6807\u201d\u3002<\/p>\n\n\n\n
\u7b2c\u4e09\u6b65\uff0c\u628a\u8fd9\u4e00\u884c\u7684\u5b57\u6bcd\u7528 -<\/code> \u8fde\u63a5\u8d77\u6765\u3002<\/p>\n\n\n\n
\u6bd4\u5982\uff1a<\/p>\n\n\n\n
[\"c\", \"b\", \"a\", \"b\", \"c\"]\n<\/code><\/pre>\n\n\n\n
\u53d8\u6210\uff1a<\/p>\n\n\n\n
c-b-a-b-c\n<\/code><\/pre>\n\n\n\n
\u7b2c\u56db\u6b65\uff0c\u628a\u8fd9\u4e00\u884c\u653e\u5230\u56fa\u5b9a\u5bbd\u5ea6\u4e2d\u95f4\uff0c\u4e24\u8fb9\u7528 -<\/code> \u8865\u9f50\u3002<\/p>\n\n\n\n
\u7b2c\u4e94\u6b65\uff0c\u751f\u6210\u4e0b\u534a\u90e8\u5206\u3002<\/p>\n\n\n\n
\u56e0\u4e3a\u56fe\u6848\u4e0a\u4e0b\u5bf9\u79f0\uff0c\u6240\u4ee5\uff1a<\/p>\n\n\n\n
\u4e0a\u534a\u90e8\u5206 + \u4e0a\u534a\u90e8\u5206\u53bb\u6389\u6700\u540e\u4e00\u884c\u540e\u5012\u5e8f\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
4. \u5b8c\u6574\u8bbe\u8ba1\u601d\u8def<\/h2>\n\n\n\n
\u7b2c\u4e00\u6b65\uff1a\u786e\u5b9a\u603b\u5bbd\u5ea6<\/h3>\n\n\n\n
\u4e2d\u95f4\u884c\u6700\u957f\u3002<\/p>\n\n\n\n
\u4ee5 size = 3<\/code> \u4e3a\u4f8b\uff1a<\/p>\n\n\n\n
c-b-a-b-c\n<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u6709\uff1a<\/p>\n\n\n\n
\u5b57\u6bcd\u6570\u91cf\uff1a2 * size - 1 = 5\n\u6a2a\u6760\u6570\u91cf\uff1a2 * size - 2 = 4\n\u603b\u5bbd\u5ea6\uff1a5 + 4 = 9\n<\/code><\/pre>\n\n\n\n
\u6240\u4ee5\u603b\u5bbd\u5ea6\u516c\u5f0f\u662f\uff1a<\/p>\n\n\n\n
width = 4 * size - 3\n<\/code><\/pre>\n\n\n\n
\u4f8b\u5982\uff1a<\/p>\n\n\n\n
size = 3 -> width = 9\nsize = 5 -> width = 17\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
\u7b2c\u4e8c\u6b65\uff1a\u751f\u6210\u6bcf\u4e00\u884c\u7684\u5b57\u6bcd<\/h3>\n\n\n\n
\u5047\u8bbe\uff1a<\/p>\n\n\n\n
letters = \"abcdefghijklmnopqrstuvwxyz\"\nsize = 3\n<\/code><\/pre>\n\n\n\n
\u6211\u4eec\u9700\u8981\u7528\u5230\uff1a<\/p>\n\n\n\n
letters[0] = a\nletters[1] = b\nletters[2] = c\n<\/code><\/pre>\n\n\n\n
\u4ece\u9876\u90e8\u5230\u4e2d\u95f4\uff0ci<\/code> \u4ece size - 1<\/code> \u9012\u51cf\u5230 0<\/code>\uff1a<\/p>\n\n\n\n
for i in range(size - 1, -1, -1):\n<\/code><\/pre>\n\n\n\n
\u5f53 size = 3<\/code> \u65f6\uff1a<\/p>\n\n\n\n
i = 2\ni = 1\ni = 0\n<\/code><\/pre>\n\n\n\n
\u5bf9\u5e94\u4e09\u884c\uff1a<\/p>\n\n\n\n
i = 2 -> c\ni = 1 -> c-b-c\ni = 0 -> c-b-a-b-c\n<\/code><\/pre>\n\n\n\n
\u751f\u6210\u4e00\u884c\u65f6\uff0c\u53ef\u4ee5\u5206\u6210\u5de6\u534a\u90e8\u5206\u548c\u53f3\u534a\u90e8\u5206\u3002<\/p>\n\n\n\n
\u6bd4\u5982 i = 0<\/code> \u65f6\uff1a<\/p>\n\n\n\n
\u5de6\u534a\u90e8\u5206\uff1ac b\n\u4e2d\u95f4\u53ca\u53f3\u534a\u90e8\u5206\uff1aa b c\n\u5408\u8d77\u6765\uff1ac b a b c\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
\u7b2c\u4e09\u6b65\uff1a\u7528 join()<\/code> \u52a0\u6a2a\u6760<\/h3>\n\n\n\n
\u5982\u679c\u6211\u4eec\u6709\u4e00\u4e2a\u5217\u8868\uff1a<\/p>\n\n\n\n
row_letters = [\"c\", \"b\", \"a\", \"b\", \"c\"]\n<\/code><\/pre>\n\n\n\n
\u53ef\u4ee5\u7528\uff1a<\/p>\n\n\n\n
\"-\".join(row_letters)\n<\/code><\/pre>\n\n\n\n
\u5f97\u5230\uff1a<\/p>\n\n\n\n
c-b-a-b-c\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
\u7b2c\u56db\u6b65\uff1a\u7528 center()<\/code> \u5c45\u4e2d\u8865\u6a2a\u6760<\/h3>\n\n\n\n
\u4f8b\u5982\uff1a<\/p>\n\n\n\n
\"c\".center(9, \"-\")\n<\/code><\/pre>\n\n\n\n
\u7ed3\u679c\u662f\uff1a<\/p>\n\n\n\n
----c----\n<\/code><\/pre>\n\n\n\n
\u4e5f\u5c31\u662f\u8bf4\uff0ccenter(\u603b\u5bbd\u5ea6, \u586b\u5145\u5b57\u7b26)<\/code> \u4f1a\u8ba9\u5b57\u7b26\u4e32\u5c45\u4e2d\uff0c\u4e0d\u591f\u7684\u4f4d\u7f6e\u7528\u6307\u5b9a\u5b57\u7b26\u8865\u9f50\u3002<\/p>\n\n\n\n
\u8fd9\u91cc\u6211\u4eec\u8981\u7528\uff1a<\/p>\n\n\n\n
row.center(width, \"-\")\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
5. \u4ee3\u7801\u5b9e\u73b0<\/h2>\n\n\n\n
\u5982\u679c\u9898\u76ee\u6a21\u677f\u8981\u6c42\u4f60\u5199 print_rangoli(size)<\/code>\uff0c\u53ef\u4ee5\u8fd9\u6837\u5199\uff1a<\/p>\n\n\n\n
def print_rangoli(size):\n    letters = \"abcdefghijklmnopqrstuvwxyz\"\n    lines = []\n    width = 4 * size - 3\n\n    for i in range(size - 1, -1, -1):\n        row_letters = []\n\n        # \u5de6\u534a\u90e8\u5206\uff1a\u4ece\u6700\u5927\u7684\u5b57\u6bcd\u5f80\u5f53\u524d\u5b57\u6bcd\u524d\u4e00\u4e2a\u8d70\n        for j in range(size - 1, i, -1):\n            row_letters.append(letters[j])\n\n        # \u4e2d\u95f4\u548c\u53f3\u534a\u90e8\u5206\uff1a\u4ece\u5f53\u524d\u5b57\u6bcd\u5f80\u6700\u5927\u7684\u5b57\u6bcd\u8d70\n        for j in range(i, size):\n            row_letters.append(letters[j])\n\n        row = \"-\".join(row_letters)\n        row = row.center(width, \"-\")\n        lines.append(row)\n\n    # \u4e0b\u534a\u90e8\u5206\u662f\u4e0a\u534a\u90e8\u5206\u53bb\u6389\u4e2d\u95f4\u884c\u4e4b\u540e\u7684\u5012\u5e8f\n    bottom_lines = lines[-2::-1]\n\n    all_lines = lines + bottom_lines\n\n    print(\"\\n\".join(all_lines))\n<\/code><\/pre>\n\n\n\n
\u5982\u679c\u4f60\u7684\u5e73\u53f0\u8981\u6c42\u51fd\u6570 return<\/code> \u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u800c\u4e0d\u662f\u76f4\u63a5 print<\/code>\uff0c\u53ef\u4ee5\u5199\u6210\uff1a<\/p>\n\n\n\n
def rangoli(size):\n    letters = \"abcdefghijklmnopqrstuvwxyz\"\n    lines = []\n    width = 4 * size - 3\n\n    for i in range(size - 1, -1, -1):\n        row_letters = []\n\n        for j in range(size - 1, i, -1):\n            row_letters.append(letters[j])\n\n        for j in range(i, size):\n            row_letters.append(letters[j])\n\n        row = \"-\".join(row_letters)\n        row = row.center(width, \"-\")\n        lines.append(row)\n\n    bottom_lines = lines[-2::-1]\n    all_lines = lines + bottom_lines\n\n    return \"\\n\".join(all_lines)\n<\/code><\/pre>\n\n\n\n
\u5982\u679c\u9898\u76ee\u6700\u540e\u6709\u7c7b\u4f3c\uff1a<\/p>\n\n\n\n
if __name__ == '__main__':\n    n = int(input())\n    print_rangoli(n)\n<\/code><\/pre>\n\n\n\n
\u4f60\u5c31\u4fdd\u7559 print_rangoli(size)<\/code> \u7248\u672c\u5373\u53ef\u3002<\/p>\n\n\n\n
\n\n\n\n
6. \u8fd0\u884c\u6f14\u793a\uff1a\u4ee5 size = 3 \u4e3a\u4f8b<\/h2>\n\n\n\n
\u9996\u5148\uff1a<\/p>\n\n\n\n
letters = \"abcdefghijklmnopqrstuvwxyz\"\nwidth = 4 * 3 - 3\n<\/code><\/pre>\n\n\n\n
\u6240\u4ee5\uff1a<\/p>\n\n\n\n
width = 9\n<\/code><\/pre>\n\n\n\n
\u5faa\u73af\u4ece\uff1a<\/p>\n\n\n\n
i = 2, 1, 0\n<\/code><\/pre>\n\n\n\n
\u5f00\u59cb\u3002<\/p>\n\n\n\n
\u5f53 i = 2<\/code> \u65f6\uff1a<\/p>\n\n\n\n
row_letters = [\"c\"]\n<\/code><\/pre>\n\n\n\n
\u8fde\u63a5\u540e\uff1a<\/p>\n\n\n\n
c\n<\/code><\/pre>\n\n\n\n
\u5c45\u4e2d\u540e\uff1a<\/p>\n\n\n\n
----c----\n<\/code><\/pre>\n\n\n\n
\u5f53 i = 1<\/code> \u65f6\uff1a<\/p>\n\n\n\n
row_letters = [\"c\", \"b\", \"c\"]\n<\/code><\/pre>\n\n\n\n
\u8fde\u63a5\u540e\uff1a<\/p>\n\n\n\n
c-b-c\n<\/code><\/pre>\n\n\n\n
\u5c45\u4e2d\u540e\uff1a<\/p>\n\n\n\n
--c-b-c--\n<\/code><\/pre>\n\n\n\n
\u5f53 i = 0<\/code> \u65f6\uff1a<\/p>\n\n\n\n
row_letters = [\"c\", \"b\", \"a\", \"b\", \"c\"]\n<\/code><\/pre>\n\n\n\n
\u8fde\u63a5\u540e\uff1a<\/p>\n\n\n\n
c-b-a-b-c\n<\/code><\/pre>\n\n\n\n
\u672c\u8eab\u5df2\u7ecf\u662f\u5bbd\u5ea6 9\uff0c\u6240\u4ee5\u4e0d\u9700\u8981\u8865\u6a2a\u6760\uff1a<\/p>\n\n\n\n
c-b-a-b-c\n<\/code><\/pre>\n\n\n\n
\u6b64\u65f6 lines<\/code> \u662f\uff1a<\/p>\n\n\n\n
[\n    \"----c----\",\n    \"--c-b-c--\",\n    \"c-b-a-b-c\"\n]\n<\/code><\/pre>\n\n\n\n
\u7136\u540e\u4e0b\u534a\u90e8\u5206\u662f\uff1a<\/p>\n\n\n\n
lines[-2::-1]\n<\/code><\/pre>\n\n\n\n
\u7ed3\u679c\u662f\uff1a<\/p>\n\n\n\n
[\n    \"--c-b-c--\",\n    \"----c----\"\n]\n<\/code><\/pre>\n\n\n\n
\u6700\u540e\u5408\u8d77\u6765\uff1a<\/p>\n\n\n\n
----c----\n--c-b-c--\nc-b-a-b-c\n--c-b-c--\n----c----\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
7. \u65b9\u6cd5\u603b\u7ed3<\/h2>\n\n\n\n
\u8fd9\u4e00\u7c7b\u56fe\u5f62\u9898\uff0c\u4e0d\u8981\u4e00\u5f00\u59cb\u5c31\u5199\u4ee3\u7801\u3002\u5148\u6309\u8fd9\u4e2a\u987a\u5e8f\u601d\u8003\uff1a<\/p>\n\n\n\n
\u7b2c\u4e00\uff0c\u627e\u6700\u5927\u5bbd\u5ea6\u3002
\u56e0\u4e3a\u56fe\u6848\u901a\u5e38\u9700\u8981\u5bf9\u9f50\uff0c\u5fc5\u987b\u5148\u77e5\u9053\u6bcf\u4e00\u884c\u5e94\u8be5\u5360\u591a\u5bbd\u3002<\/p>\n\n\n\n
\u7b2c\u4e8c\uff0c\u627e\u201c\u6838\u5fc3\u884c\u5185\u5bb9\u201d\u3002
\u8fd9\u91cc\u6838\u5fc3\u4e0d\u662f\u6a2a\u6760\uff0c\u800c\u662f\u5b57\u6bcd\u53d8\u5316\uff1a<\/p>\n\n\n\n
c\nc-b-c\nc-b-a-b-c\n<\/code><\/pre>\n\n\n\n
\u7b2c\u4e09\uff0c\u5224\u65ad\u662f\u5426\u6709\u5bf9\u79f0\u6027\u3002
\u8fd9\u9053\u9898\u4e0a\u4e0b\u5bf9\u79f0\uff0c\u6240\u4ee5\u53ea\u9700\u8981\u751f\u6210\u4e0a\u534a\u90e8\u5206\u548c\u4e2d\u95f4\u884c\u3002<\/p>\n\n\n\n
\u7b2c\u56db\uff0c\u628a\u6bcf\u4e00\u884c\u4f5c\u4e3a\u5b57\u7b26\u4e32\u653e\u8fdb\u5217\u8868\u3002
\u6700\u540e\u7528\uff1a<\/p>\n\n\n\n
\"\\n\".join(lines)\n<\/code><\/pre>\n\n\n\n
\u4e00\u6b21\u6027\u5408\u6210\u6700\u7ec8\u7ed3\u679c\u3002<\/p>\n\n\n\n
\u7b2c\u4e94\uff0c\u56fe\u5f62\u9898\u5e38\u7528\u5de5\u5177\u5305\u62ec\uff1a<\/p>\n\n\n\n
join()\ncenter()\nappend()\nrange()\n<\/code><\/pre>\n\n\n\n
\u8fd9\u9053\u9898\u6700\u5173\u952e\u7684\u662f\uff1a<\/p>\n\n\n\n
\u5148\u751f\u6210\u6bcf\u884c\u5b57\u6bcd\uff0c\u518d\u7528 - \u8fde\u63a5\uff0c\u518d\u5c45\u4e2d\u8865 -\uff0c\u6700\u540e\u4e0a\u4e0b\u955c\u50cf\u3002\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
8. \u540c\u7c7b\u578b\u5c0f\u7ec3\u4e60<\/h2>\n\n\n\n
\u8bf7\u4f60\u5c1d\u8bd5\u6253\u5370\u4e0b\u9762\u8fd9\u79cd\u6570\u5b57\u83f1\u5f62\u3002<\/p>\n\n\n\n
\u8f93\u5165\uff1a<\/p>\n\n\n\n
3\n<\/code><\/pre>\n\n\n\n
\u8f93\u51fa\uff1a<\/p>\n\n\n\n
--3--\n-323-\n32123\n-323-\n--3--\n<\/code><\/pre>\n\n\n\n
\u63d0\u793a\uff1a<\/p>\n\n\n\n
\u8fd9\u9053\u9898\u548c alphabet rangoli \u5f88\u50cf\uff0c\u53ea\u662f\u628a\u5b57\u6bcd\u6362\u6210\u4e86\u6570\u5b57\u3002<\/p>\n\n\n\n
\u601d\u8003\u65b9\u5411\uff1a<\/p>\n\n\n\n
size = 3\n\u7b2c\u4e00\u884c\uff1a3\n\u7b2c\u4e8c\u884c\uff1a3 2 3\n\u7b2c\u4e09\u884c\uff1a3 2 1 2 3\n<\/code><\/pre>\n\n\n\n
\u4ecd\u7136\u53ef\u4ee5\u5148\u751f\u6210\u4e0a\u534a\u90e8\u5206\uff0c\u518d\u955c\u50cf\u4e0b\u534a\u90e8\u5206\u3002<\/p>\n\n\n\n
bottom_lines = lines[-2::-1]<\/code><\/pre>\n\n\n\n
    bottom_lines = lines[-2::-1]\uff0c\u8fd9\u4e2a\u4ee3\u7801\u6ca1\u6709\u770b\u61c2<\/code><\/pre>\n\n\n\n
\u8fd9\u884c\u4ee3\u7801\uff1a<\/p>\n\n\n\n
bottom_lines = lines[-2::-1]\n<\/code><\/pre>\n\n\n\n
\u6838\u5fc3\u662f\u5728\u505a\u4e00\u4ef6\u4e8b\uff1a\u4ece lines<\/code> \u91cc\u53d6\u51fa\u4e0b\u534a\u90e8\u5206\uff0c\u5e76\u4e14\u5012\u7740\u53d6\uff0c\u907f\u514d\u91cd\u590d\u4e2d\u95f4\u6700\u957f\u7684\u4e00\u884c\u3002<\/strong><\/p>\n\n\n\n
\u53ef\u4ee5\u5148\u628a\u5b83\u62c6\u6210\u4e09\u90e8\u5206\u770b\uff1a<\/p>\n\n\n\n
lines[start : stop : step]\n<\/code><\/pre>\n\n\n\n
\u5bf9\u5e94\u5230\u4f60\u7684\u4ee3\u7801\u5c31\u662f\uff1a<\/p>\n\n\n\n
lines[-2 :  : -1]\n<\/code><\/pre>\n\n\n\n
\u542b\u4e49\u662f\uff1a<\/p>\n\n\n\n
\u90e8\u5206<\/th>\u5199\u6cd5<\/th>\u542b\u4e49<\/th><\/tr><\/thead>
start<\/td>-2<\/code><\/td>\u4ece\u5012\u6570\u7b2c\u4e8c\u4e2a\u5143\u7d20\u5f00\u59cb<\/td><\/tr>
stop<\/td>\u7a7a\u7740<\/td>\u4e00\u76f4\u53d6\u5230\u5217\u8868\u5f00\u5934<\/td><\/tr>
step<\/td>-1<\/code><\/td>\u5012\u7740\u53d6<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\u6240\u4ee5\uff1a<\/p>\n\n\n\n
lines[-2::-1]\n<\/code><\/pre>\n\n\n\n
\u610f\u601d\u5c31\u662f\uff1a<\/p>\n\n\n\n
\n
\u4ece\u5012\u6570\u7b2c\u4e8c\u884c\u5f00\u59cb\uff0c\u5012\u7740\u4e00\u8def\u53d6\u5230\u7b2c\u4e00\u884c\u3002<\/p>\n<\/blockquote>\n\n\n\n
\n\n\n\n
\u7528\u4f60\u7684 rangoli \u4e3e\u4f8b\u3002\u5047\u8bbe size = 3<\/code>\uff0c\u524d\u9762\u751f\u6210\u51fa\u6765\u7684 lines<\/code> \u662f\uff1a<\/p>\n\n\n\n
lines = [\n    \"----c----\",\n    \"--c-b-c--\",\n    \"c-b-a-b-c\"\n]\n<\/code><\/pre>\n\n\n\n
\u8fd9\u4e09\u884c\u5176\u5b9e\u662f\uff1a<\/p>\n\n\n\n
----c----\n--c-b-c--\nc-b-a-b-c\n<\/code><\/pre>\n\n\n\n
\u8fd9\u53ea\u662f\u4e0a\u534a\u90e8\u5206\u52a0\u4e2d\u95f4\u884c\u3002<\/p>\n\n\n\n
\u5b8c\u6574\u56fe\u6848\u8fd8\u9700\u8981\u4e0b\u534a\u90e8\u5206\uff1a<\/p>\n\n\n\n
--c-b-c--\n----c----\n<\/code><\/pre>\n\n\n\n
\u8fd9\u4e2a\u4e0b\u534a\u90e8\u5206\u6b63\u597d\u5c31\u662f\u628a\u524d\u9762\u7684\u4e0a\u534a\u90e8\u5206\u5012\u8fc7\u6765\u3002<\/p>\n\n\n\n
\u4f46\u662f\u6ce8\u610f\uff0c\u4e0d\u80fd\u4ece\u6700\u540e\u4e00\u884c\u5f00\u59cb\u5012\u7740\u53d6\u3002<\/p>\n\n\n\n
\u5982\u679c\u5199\u6210\uff1a<\/p>\n\n\n\n
lines[-1::-1]\n<\/code><\/pre>\n\n\n\n
\u7ed3\u679c\u662f\uff1a<\/p>\n\n\n\n
[\n    \"c-b-a-b-c\",\n    \"--c-b-c--\",\n    \"----c----\"\n]\n<\/code><\/pre>\n\n\n\n
\u8fd9\u6837\u4f1a\u628a\u4e2d\u95f4\u6700\u957f\u7684\u4e00\u884c \"c-b-a-b-c\"<\/code> \u91cd\u590d\u4e00\u6b21\u3002<\/p>\n\n\n\n
\u6240\u4ee5\u8981\u4ece\u5012\u6570\u7b2c\u4e8c\u884c\u5f00\u59cb\uff1a<\/p>\n\n\n\n
lines[-2::-1]\n<\/code><\/pre>\n\n\n\n
\u7ed3\u679c\u662f\uff1a<\/p>\n\n\n\n
[\n    \"--c-b-c--\",\n    \"----c----\"\n]\n<\/code><\/pre>\n\n\n\n
\u6b63\u597d\u5c31\u662f\u4e0b\u534a\u90e8\u5206\u3002<\/p>\n\n\n\n
\n\n\n\n
\u6240\u4ee5\u8fd9\u4e24\u884c\uff1a<\/p>\n\n\n\n
bottom_lines = lines[-2::-1]\nall_lines = lines + bottom_lines\n<\/code><\/pre>\n\n\n\n
\u7b49\u4ef7\u4e8e\uff1a<\/p>\n\n\n\n
bottom_lines = [\n    \"--c-b-c--\",\n    \"----c----\"\n]\n\nall_lines = [\n    \"----c----\",\n    \"--c-b-c--\",\n    \"c-b-a-b-c\",\n    \"--c-b-c--\",\n    \"----c----\"\n]\n<\/code><\/pre>\n\n\n\n
\u6700\u540e\u518d\uff1a<\/p>\n\n\n\n
print(\"\\n\".join(all_lines))\n<\/code><\/pre>\n\n\n\n
\u8f93\u51fa\u5b8c\u6574\u56fe\u6848\u3002<\/p>\n\n\n\n
\n\n\n\n
\u5bf9\u521d\u5b66\u8005\u6765\u8bf4\uff0c\u8fd9\u884c\u4ee3\u7801\u53ef\u4ee5\u5148\u5199\u6210\u66f4\u5bb9\u6613\u7406\u89e3\u7684\u5faa\u73af\u7248\u672c\uff1a<\/p>\n\n\n\n
bottom_lines = []\n\nfor i in range(len(lines) - 2, -1, -1):\n    bottom_lines.append(lines[i])\n<\/code><\/pre>\n\n\n\n
\u8fd9\u6bb5\u548c\u4e0b\u9762\u8fd9\u4e00\u884c\u6548\u679c\u4e00\u6837\uff1a<\/p>\n\n\n\n
bottom_lines = lines[-2::-1]\n<\/code><\/pre>\n\n\n\n
\u9010\u6b65\u89e3\u91ca\uff1a<\/p>\n\n\n\n
range(len(lines) - 2, -1, -1)\n<\/code><\/pre>\n\n\n\n
\u8868\u793a\uff1a<\/p>\n\n\n\n
\u4ece\u5012\u6570\u7b2c\u4e8c\u884c\u7684\u4e0b\u6807\u5f00\u59cb\uff0c\u5012\u7740\u8d70\uff0c\u4e00\u76f4\u8d70\u5230\u7b2c 0 \u884c\u3002<\/p>\n\n\n\n
\n\n\n\n
\u8fd9\u4e00\u53e5\u7684\u5173\u952e\u8bb0\u6cd5\u662f\uff1a<\/p>\n\n\n\n
\u5217\u8868[-2::-1]\n<\/code><\/pre>\n\n\n\n
\u53ef\u4ee5\u7406\u89e3\u6210\uff1a<\/p>\n\n\n\n
\n
\u4e0d\u8981\u6700\u540e\u4e00\u4e2a\uff0c\u4ece\u5012\u6570\u7b2c\u4e8c\u4e2a\u5f00\u59cb\uff0c\u5012\u7740\u53d6\u5230\u5f00\u5934\u3002<\/p>\n<\/blockquote>\n\n\n\n
\u5728\u8fd9\u9053\u9898\u91cc\uff0c\u6700\u540e\u4e00\u4e2a\u5c31\u662f\u4e2d\u95f4\u6700\u957f\u7684\u90a3\u4e00\u884c\u3002\u5b83\u5df2\u7ecf\u5728 lines<\/code> \u91cc\u9762\u51fa\u73b0\u8fc7\u4e86\uff0c\u6240\u4ee5\u751f\u6210\u4e0b\u534a\u90e8\u5206\u65f6\u4e0d\u80fd\u518d\u91cd\u590d\u5b83\u3002<\/p>\n\n\n\n
\u5c0f\u7ec3\u4e60\uff1a<\/p>\n\n\n\n
nums = [10, 20, 30, 40, 50]\nprint(nums[-2::-1])\n<\/code><\/pre>\n\n\n\n
\u4f60\u53ef\u4ee5\u5148\u4e0d\u8981\u8fd0\u884c\uff0c\u81ea\u5df1\u5224\u65ad\u5b83\u4f1a\u8f93\u51fa\u4ec0\u4e48\u3002\u63d0\u793a\uff1a\u4ece\u5012\u6570\u7b2c\u4e8c\u4e2a\u5143\u7d20 40<\/code> \u5f00\u59cb\uff0c\u5012\u7740\u53d6\u5230\u5f00\u5934\u3002<\/p>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
1. \u9898\u76ee\u8003\u70b9 \u8fd9\u9053\u9898\u4e3b\u8981\u8003\uff1a \u5b57\u7b26\u4e32\u62fc\u63a5\u3001\u5217\u8868\u5b58\u50a8\u6bcf\u4e00\u884c\u3001join() \u8fde\u63a5\u5b57\u7b26\u3001center() \u5c45\u4e2d\u586b\u5145 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[54],"tags":[],"class_list":["post-2204","post","type-post","status-publish","format-standard","hentry","category-text"],"_links":{"self":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts\/2204","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/comments?post=2204"}],"version-history":[{"count":2,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts\/2204\/revisions"}],"predecessor-version":[{"id":2208,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts\/2204\/revisions\/2208"}],"wp:attachment":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/media?parent=2204"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/categories?post=2204"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/tags?post=2204"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}