{"id":260,"date":"2019-01-10T02:59:42","date_gmt":"2019-01-10T02:59:42","guid":{"rendered":""},"modified":"2020-10-01T01:59:04","modified_gmt":"2020-09-30T17:59:04","slug":"python3%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8chr%e6%8a%8a%e4%b8%80%e4%b8%aa%e5%a4%a7%e4%ba%8e128%e6%95%b0%e5%ad%97%e8%bd%ac%e4%b8%baascii%e7%9a%84bytes%e7%b1%bb%e5%9e%8b","status":"publish","type":"post","link":"http:\/\/weizn.net\/?p=260","title":{"rendered":"Python3\u5982\u4f55\u4f7f\u7528chr()\u628a\u4e00\u4e2a\u5927\u4e8e128\u6570\u5b57\u8f6c\u4e3aascii\u7684bytes\u7c7b\u578b"},"content":{"rendered":"

\u539f\u6587\uff1a<\/span>https:\/\/www.oschina.net\/question\/2741863_2199513<\/span><\/a><\/span><\/p>\n

\u95ee\uff1a<\/span>
\n\u5728 num<128\u7684\u65f6\u5019\uff0c\u4f7f\u7528chr(num).encode(‘utf-8’)\u5f97\u5230\u7684\u662f\u4e00\u4e2a\u5b57\u7b26\u7684ascii\u5341\u516d\u8fdb\u5236<\/span>
\n\u4f46\u662f\u5728num>128\u7684\u65f6\u5019\uff0c\u4f7f\u7528chr(num).encode(‘utf-8’)\u5f97\u5230\u7684\u662f\u4e24\u4e2a\u5b57\u8282\u7684ascii\u5341\u516d\u8fdb\u5236\uff0c\u8bf7\u95ee\u8be5\u5982\u4f55\u8f6c\u6362\uff0c\u6211\u80fd\u591f\u5f97\u5230\u4e00\u4e2a\u5b57\u8282\u7684\u5341\u516d\u8fdb\u5236\uff1f\uff1f<\/span><\/p>\n

\u7b54\uff1a<\/span>
\n\u8fd9\u662f\u4e00\u4e2a\u5f88\u6709\u610f\u601d\u7684\u95ee\u9898\uff0c\u8ba9\u6211\u6765\u4ece\u5934\u8bb2\u8d77\u3002<\/span>
\n\u9996\u5148\uff0c\u6211\u4eec\u770b\u770bhelp(chr)\uff0c\u53ef\u4ee5\u77e5\u9053Return a Unicode string of one character with ordinal i; 0 <= i <= 0x10ffff. \u6240\u4ee5chr(i)\u51fd\u6570\u5b9e\u9645\u4e0a\u8fd4\u56de\u7684\u662fUnicode\u7f16\u7801\u8868\u4e2d\u7684\u4e00\u4e2a\u5b57\u7b26\uff0c\u53c2\u6570i\u6307\u5b9a\u4e86\u8fd9\u4e2a\u5b57\u7b26\u5728Unicdoe\u7f16\u7801\u8868\u4e2d\u7684\u4f4d\u7f6e\u3002<\/span><\/p>\n

PS1\uff1aUnicode\u7f16\u7801\u8868\u662f\u4e00\u4e2a\u5168\u7403\u7edf\u4e00\u7684\u6807\u51c6\uff0c\u6211\u4eec\u53ef\u4ee5\u8ba4\u4e3a\u5b83\u4e3a\u4e16\u754c\u4e0a\u6240\u6709\u7684\u5b57\u7b26\uff08\u8fd8\u6709\u4e00\u4e9bglyph\u3001\u8868\u60c5\u4e4b\u7c7b\u7684\uff09\u90fd\u7f16\u4e86\u53f7\u3002\u800c\u5176\u4ed6\u4e00\u4e9b\u7f16\u7801\uff0c\u6bd4\u5982ASCII\u3001GBK\u3001cp1252\u7b49\u7f16\u7801\uff0c\u5219\u53ea\u7f16\u7801\u4e86Unicode\u7f16\u7801\u8868\u4e2d\u7684\u4e00\u90e8\u5206\u5b57\u7b26\u3002\u5f53\u7136\u8fd8\u6709utf-8\u548cuft-16\u7b49\u7f16\u7801\u5219\u662f\u91c7\u7528\u4e0d\u540c\u7684\u65b9\u5f0f\u7f16\u7801\u4e86\u6240\u6709\u7684Unicode\u5b57\u7b26\u3002\u76ee\u524dUnicode\u5df2\u7ecf\u53d1\u5e03\u5230\u4e86\u7b2c9\u7248\uff0cPython 3\u5185\u90e8\u91c7\u7528Unicode\u8868\u793a\u6240\u6709\u5b57\u7b26\uff0c\u5373str\u7c7b\u578b\uff0c\u800c\u7f16\u7801\u6210\u5176\u4ed6\u7f16\u7801\u683c\u5f0f\u540e\uff0c\u5219\u662fBytes\u7c7b\u578b\u3002<\/span><\/p>\n

ASCII\u7f16\u7801\u4e2d\u6bcf\u4e2a\u5b57\u7b26\u7f16\u7801\u662f1\u4e2aByte\uff0c\u4e14\u53ea\u67090-127\uff0c\u800c128\uff0d255\u90e8\u5206\u7684\u7f16\u7801\u5c5e\u4e8eExtended ASCII\u3002Python\u9ed8\u8ba4\u7684ASCII\u4e2d\u662f\u6ca1\u6709\u5927\u4e8e127\u90e8\u5206\u7684\uff0c\u5982\u679c\u6267\u884c\uff1achr(128).encode(‘ascii’)\uff0c\u4f1a\u5f97\u5230\u5f02\u5e38’ascii’ codec can’t encode character ‘\\x80’ in position 0: ordinal not in range(128)<\/span><\/p>\n

\u800cutf-8\u7f16\u7801\u867d\u7136\u652f\u6301\u6240\u6709\u7684Unicode\u5b57\u7b26\uff0c\u4f46\u6839\u636e\u5b57\u7b26\u7684\u4e0d\u540c\uff0c\u4f1a\u91c7\u75281~3\u4e2aByte\u6765\u7f16\u7801\u5b57\u7b26\u3002\u5b83\u5bf9\u4e8eASCII\u7f16\u7801\u662f\u517c\u5bb9\u7684\uff0c\u6240\u4ee50~127\u7684\u90e8\u5206\u548cutf-8\u548cascii\u7684\u7f16\u7801\u662f\u4e00\u6837\u7684\u3002\u4f46\u662f\u5927\u4e8e128\u7684\u90a3\u90e8\u5206extended ascii\u4e2d\u7684\u5b57\u7b26\uff0c\u5219\u91c7\u7528\u4e86\u4e24\u4e2a\u5b57\u8282\u8fdb\u884c\u7f16\u7801\uff0c\u8fd9\u4e5f\u662f\u4e3a\u4ec0\u4e48\u4f60\u7684\u4ee3\u7801\u5f97\u5230\u4e86\u4e24\u4e2aBytes\u3002<\/span><\/p>\n

\u6211\u731c\u4f60\u9700\u8981\u7684\u662f\u4e00\u4e2a\u652f\u6301Extended ASCII\u90e8\u5206\u5b57\u7b26\uff0c\u4e14\u91c7\u75281\u4e2aByte\u56fa\u5b9a\u5927\u5c0f\u7f16\u7801\u7684encoding\uff0c\u6bd4\u5982ISO 8859-1\uff0c\u4e5f\u88ab\u79f0\u4e3alatin1\u3002<\/span>
\n\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u6bd4\u5982\u4eba\u6c11\u5e01\u94b1\u591a\u7b26\u53f7\u00a5\u5728Unicode\u4e2d\u7684\u4f4d\u7f6e\u662f165\u3002<\/span><\/p>\n

>>> chr(165)<\/span>
\n\u00a5<\/span>
\n>>> chr(165).encode(‘latin1’)<\/span>
\nb’\\xa5′<\/span><\/p>\n

\u5176\u4ed6\u7684\u7f16\u7801\u6bd4\u5982cp437\u3001cp1252\uff0c\u4e5f\u53ef\u4ee5\u7f16\u7801128-255\u4e2d\u7684\u90e8\u5206\u5b57\u7b26\uff0c\u6bd4\u5982 chr(165).encode(‘cp437’)\u8fd4\u56deb’\\x9d’\uff0c\u6bd4\u5982 chr(165).encode(‘cp1252’)\u8fd4\u56deb’\\xa5’\u3002\u4f46\u5982\u679c\u7f16\u7801chr(128)\u5c31\u4f1a\u62a5\u9519\u3002\u6240\u4ee5\uff0c\u5982\u679c\u4f60\u7684\u76ee\u7684\u662f\u8981\u80fd\u652f\u6301chr(i)\uff0c0 <= i <= 255\uff0c\u90a3\u4e48\u6211\u8fd8\u662f\u63a8\u8350\u4f60\u7528latin1\u3002<\/span><\/p>\n

PS2\uff1a\u5173\u4e8e\u8fd9\u4e2a\u95ee\u9898\uff0c\u300aFluent Python\u300b\u7684\u7b2c4\u7ae0\u503c\u5f97\u4e00\u8bfb\uff0c\u8bb2\u5f97\u975e\u5e38\u6e05\u695a\u3002<\/span><\/p>\n

\u53c2\u8003\u8d44\u6599\uff1a<\/span>
\n* \u300aFluent Python\u300b, Chapter 4<\/span>
\n* http:\/\/www.ascii-code.com\/<\/span>
\n* https:\/\/en.wikibooks.org\/wiki\/Unicode\/Character_reference\/0000-0FFF<\/span>
\n* https:\/\/en.wikipedia.org\/wiki\/Extended_ASCII#ISO_8859_and_proprietary_adaptations<\/span>
\n* https:\/\/docs.python.org\/3.5\/library\/unicodedata.html<\/span><\/p>\n

 <\/p>\n

\u4f8b\u5b50\uff1a<\/span><\/p>\n

def replace_char(ch):\r\n    if ch == \"a\":\r\n        return \"ab\"\r\n    return ch\r\n\r\ns = \"\u4f60\u597daaa\u963f\u65af\u8482\u82ac\"\r\nif isinstance(s, str) is True:\r\n    try:\r\n        print(111)\r\n        s = s.encode(encoding=\"UTF-8\")\r\n        t = s.decode(encoding=\"UTF-8\")\r\n        print(t)\r\n    except:\r\n        pass\r\n\r\nprint(len(s))\r\nprint(s)\r\nl = list(s)\r\nprint(l)\r\ns =  b\"\".join([b\"\\\"\", b\"\".join(\r\n                             map(\r\n                                 lambda ch: replace_char(ch).encode(\"latin1\"),\r\n                                 map(lambda o: chr(o), s)\r\n                             )\r\n                         )\r\n             , b\"\\\"\"])\r\n\r\nprint(len(s))\r\nprint(s)\r\n\r\nprint(type(s))\r\ns = str(s, \"UTF-8\")\r\n\r\nprint(s)<\/pre>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
\n\t\u539f\u6587\uff1a<\/span>https:\/\/www.oschina.net\/question\/2741863_2199513<\/span><\/a><\/span>\n<\/p>\n
\n\t\n<\/p>\n
\n\t\u95ee\uff1a<\/span>
\n\u5728 num<128\u7684\u65f6\u5019\uff0c\u4f7f\u7528chr(num).encode(‘utf-8’)\u5f97\u5230\u7684\u662f\u4e00\u4e2a\u5b57\u7b26\u7684ascii\u5341\u516d\u8fdb\u5236<\/span>
\n\u4f46\u662f\u5728num>128\u7684\u65f6\u5019\uff0c\u4f7f\u7528chr(num).encode(‘utf-8’)\u5f97\u5230\u7684\u662f\u4e24\u4e2a\u5b57\u8282\u7684ascii\u5341\u516d\u8fdb\u5236\uff0c\u8bf7\u95ee\u8be5\u5982\u4f55\u8f6c\u6362\uff0c\u6211\u80fd\u591f\u5f97\u5230\u4e00\u4e2a\u5b57\u8282\u7684\u5341\u516d\u8fdb…<\/span><\/p>\n","protected":false},"author":1,"featured_media":556,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[334],"tags":[348],"class_list":["post-260","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","tag-python"],"yoast_head":"\nPython3\u5982\u4f55\u4f7f\u7528chr()\u628a\u4e00\u4e2a\u5927\u4e8e128\u6570\u5b57\u8f6c\u4e3aascii\u7684bytes\u7c7b\u578b - Wayne's Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/weizn.net\/?p=260\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python3\u5982\u4f55\u4f7f\u7528chr()\u628a\u4e00\u4e2a\u5927\u4e8e128\u6570\u5b57\u8f6c\u4e3aascii\u7684bytes\u7c7b\u578b - 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