{"id":82,"date":"2024-01-20T23:34:27","date_gmt":"2023-11-18T13:12:03","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/%e5%9c%a8python%e4%b8%ad%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8__str__%e5%92%8c__repr__%e6%96%b9%e6%b3%95%e3%80%82\/"},"modified":"2025-07-31T22:35:11","modified_gmt":"2025-07-31T14:35:11","slug":"%e5%9c%a8python%e4%b8%ad%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8__str__%e5%92%8c__repr__%e6%96%b9%e6%b3%95%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8python%e4%b8%ad%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8__str__%e5%92%8c__repr__%e6%96%b9%e6%b3%95%e3%80%82\/","title":{"rendered":"Python\u4e2d__str__()\u4e0e__repr__()\u65b9\u6cd5\uff1a\u6df1\u5ea6\u89e3\u6790\u4e0e\u6700\u4f73\u5b9e\u8df5"},"content":{"rendered":"

\u5f15\u8a00<\/h3>\n

\u5728\u672c\u6587\u4e2d\uff0c\u60a8\u5c06\u6df1\u5165\u4e86\u89e3Python\u6570\u636e\u6a21\u578b\u4e2d\u5b9a\u4e49\u7684\u7279\u6b8a\u65b9\u6cd5__str__()<\/code>\u548c__repr__()<\/code>\u3002\u901a\u8fc7\u8bb0\u5f55\u6216\u6253\u5370\u6709\u5173\u5bf9\u8c61\u7684\u6709\u7528\u4fe1\u606f\uff0c__str__()<\/code>\u548c__repr__()<\/code>\u65b9\u6cd5\u80fd\u591f\u6781\u5927\u5730\u5e2e\u52a9\u60a8\u8c03\u8bd5Python\u4ee3\u7801\u3002<\/p>\n

Python\u7684\u7279\u6b8a\u65b9\u6cd5\u4ee5\u53cc\u4e0b\u5212\u7ebf\u5f00\u5934\u548c\u7ed3\u5c3e\uff0c\u901a\u5e38\u88ab\u79f0\u4e3a\u201c\u53cc\u4e0b\u5212\u7ebf\u65b9\u6cd5\u201d\uff08dunder methods\uff09\u3002\u8fd9\u4e9b\u53cc\u4e0b\u5212\u7ebf\u65b9\u6cd5\u662fPython\u5185\u7f6e\u8fd0\u7b97\u7b26\u548c\u51fd\u6570\u7684\u57fa\u7840\u3002\u901a\u5e38\u5e94\u907f\u514d\u76f4\u63a5\u8c03\u7528\u53cc\u4e0b\u5212\u7ebf\u65b9\u6cd5\uff0c\u800c\u662f\u5728\u60a8\u7684\u7c7b\u4e2d\u5b9e\u73b0\u5b83\u4eec\uff0c\u7136\u540e\u901a\u8fc7\u8c03\u7528\u76f8\u5e94\u7684\u5185\u7f6e\u51fd\u6570\u6765\u95f4\u63a5\u4f7f\u7528\uff0c\u4f8b\u5982str()<\/code>\u548crepr()<\/code>\u3002<\/p>\n

__str__()<\/code>\u548c__repr__()<\/code>\u4e4b\u95f4\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h2>\n

__str__()<\/code>\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5bf9\u8c61\u7684\u53ef\u8bfb\u6027\u5f3a\u3001\u975e\u6b63\u5f0f\u7684\u5b57\u7b26\u4e32\u8868\u793a\u3002\u8be5\u65b9\u6cd5\u4f1a\u88ab\u5185\u7f6e\u7684print()<\/code>\u3001str()<\/code>\u548cformat()<\/code>\u51fd\u6570\u8c03\u7528\u3002\u5982\u679c\u4e00\u4e2a\u7c7b\u6ca1\u6709\u5b9a\u4e49__str__()<\/code>\u65b9\u6cd5\uff0c\u90a3\u4e48\u5185\u7f6e\u7684\u5bf9\u8c61\u5b9e\u73b0\u4f1a\u8f6c\u800c\u8c03\u7528__repr__()<\/code>\u65b9\u6cd5\u3002<\/p>\n

__repr__()<\/code>\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u66f4\u4e30\u5bcc\u3001\u66f4\u5b98\u65b9\u7684\u5bf9\u8c61\u5b57\u7b26\u4e32\u8868\u793a\u3002\u6b64\u65b9\u6cd5\u7531\u5185\u7f6e\u7684repr()<\/code>\u51fd\u6570\u8c03\u7528\u3002\u5982\u679c\u53ef\u80fd\u7684\u8bdd\uff0c\u8fd4\u56de\u7684\u5b57\u7b26\u4e32\u5e94\u8be5\u662f\u4e00\u4e2a\u53ef\u7528\u4e8e\u91cd\u65b0\u521b\u5efa\u5bf9\u8c61\u7684\u6709\u6548Python\u8868\u8fbe\u5f0f\u3002\u5728\u6240\u6709\u60c5\u51b5\u4e0b\uff0c\u8be5\u5b57\u7b26\u4e32\u90fd\u5e94\u63d0\u4f9b\u4fe1\u606f\u4e30\u5bcc\u4e14\u660e\u786e\u65e0\u8bef\u7684\u8868\u793a\u3002<\/p>\n

\u603b\u7684\u6765\u8bf4\uff0c__str__()<\/code>\u65b9\u6cd5\u8fd4\u56de\u7684\u5b57\u7b26\u4e32\u662f\u4e3a\u7528\u6237\u8bbe\u8ba1\u7684\uff0c\u800c__repr__()<\/code>\u65b9\u6cd5\u8fd4\u56de\u7684\u5b57\u7b26\u4e32\u5219\u662f\u4e3a\u5f00\u53d1\u8005\u8bbe\u8ba1\u7684\u3002<\/p>\n

\u4f7f\u7528\u5185\u7f6e\u7c7b\u7684__str__()<\/code>\u548c__repr__()<\/code>\u65b9\u6cd5\u793a\u4f8b<\/h2>\n

\u5728\u672c\u8282\u7684\u793a\u4f8b\u4e2d\uff0c\u4e3a\u4e86\u6f14\u793a\u76ee\u7684\uff0c\u6211\u4eec\u5c06\u76f4\u63a5\u8c03\u7528__str__()<\/code>\u548c__repr__()<\/code>\u65b9\u6cd5\u3002<\/p>\n

datetime.datetime<\/code>\u7c7b\u662f\u4e00\u4e2a\u5185\u7f6e\u7684Python\u7c7b\uff0c\u5b83\u5177\u6709__str__()<\/code>\u548c__repr__()<\/code>\u65b9\u6cd5\u7684\u9ed8\u8ba4\u5b9e\u73b0\u3002<\/p>\n

\u4ee5\u4e0b\u793a\u4f8b\u4ee3\u7801\u5c55\u793a\u4e86datetime.datetime<\/code>\u5bf9\u8c61\u7684__str__()<\/code>\u548c__repr__()<\/code>\u65b9\u6cd5\u7684\u9ed8\u8ba4\u5b9e\u73b0\u6240\u8fd4\u56de\u7684\u5b57\u7b26\u4e32\uff1a<\/p>\n

import<\/span> datetime\r\n\r\nmydate =<\/span> datetime.<\/span>datetime.<\/span>now(<\/span>)<\/span>\r\n\r\nprint<\/span>(<\/span>\"__str__() string: \"<\/span>,<\/span> mydate.<\/span>__str__(<\/span>)<\/span>)<\/span>\r\nprint<\/span>(<\/span>\"str() string: \"<\/span>,<\/span> str<\/span>(<\/span>mydate)<\/span>)<\/span>\r\n\r\nprint<\/span>(<\/span>\"__repr__() string: \"<\/span>,<\/span> mydate.<\/span>__repr__(<\/span>)<\/span>)<\/span>\r\nprint<\/span>(<\/span>\"repr() string: \"<\/span>,<\/span> repr<\/span>(<\/span>mydate)<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u8f93\u51fa\u662f\uff1a<\/p>\n
Output<\/div>\n
__str__() string: 2023-01-27 09:50:37.429078\r\nstr() string: 2023-01-27 09:50:37.429078\r\n__repr__() string: datetime.datetime(2023, 1, 27, 9, 50, 37, 429078)\r\nrepr() string: datetime.datetime(2023, 1, 27, 9, 50, 37, 429078)<\/code><\/pre>\n
\u8f93\u51fa\u663e\u793a\uff0cstr()<\/code>\u51fd\u6570\u8c03\u7528__str__()<\/code>\u5e76\u8fd4\u56de\u4e00\u4e2a\u4eba\u7c7b\u53cb\u597d\u7684\u5b57\u7b26\u4e32\uff0c\u800crepr()<\/code>\u51fd\u6570\u8c03\u7528__repr__()<\/code>\u5e76\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u66f4\u591a\u4fe1\u606f\u7684\u5b57\u7b26\u4e32\uff0c\u8be5\u5b57\u7b26\u4e32\u53ef\u4ee5\u7528\u6765\u91cd\u65b0\u521b\u5efa\u5bf9\u8c61\u3002\u4e8b\u5b9e\u4e0a\uff0c\u60a8\u53ef\u4ee5\u7ed3\u5408\u4f7f\u7528repr()<\/code>\u51fd\u6570\u548ceval()<\/code>\u51fd\u6570\u6765\u4ece\u5b57\u7b26\u4e32\u521b\u5efa\u4e00\u4e2a\u65b0\u5bf9\u8c61\u3002<\/p>\n
import<\/span> datetime\r\n\r\nmydate1 =<\/span> datetime.<\/span>datetime.<\/span>now(<\/span>)<\/span>\r\nmydate2 =<\/span> eval<\/span>(<\/span>repr<\/span>(<\/span>mydate1)<\/span>)<\/span><\/mark>\r\n\r\nprint<\/span>(<\/span>\"mydate1 repr() string: \"<\/span>,<\/span> repr<\/span>(<\/span>mydate1)<\/span>)<\/span>\r\nprint<\/span>(<\/span>\"mydate2 repr() string: \"<\/span>,<\/span> repr<\/span>(<\/span>mydate2)<\/span>)<\/span>\r\n\r\nprint<\/span>(<\/span>\"the values of the objects are equal: \"<\/span>,<\/span> mydate1==<\/span>mydate2)<\/span>\r\n<\/code><\/pre>\n
\u8f93\u51fa\u4e3a\uff1a<\/p>\n
Output<\/div>\n
\u8fd9\u662f\u6587\u7ae0\u300a\u5728Python\u4e2d\u5982\u4f55\u4f7f\u7528__str__()<\/code>\u548c__repr__()<\/code>\u65b9\u6cd5\u300b\u7684\u7b2c2\u90e8\u5206\uff08\u51713\u90e8\u5206\uff09\u3002<\/p>\n
mydate1 repr() \u5b57\u7b26\u4e32: datetime.datetime(2023, 1, 26, 9, 43, 24, 479635)\r\nmydate2 repr() \u5b57\u7b26\u4e32: datetime.datetime(2023, 1, 26, 9, 43, 24, 479635)\r\n\u5bf9\u8c61\u503c\u76f8\u7b49: True<\/code><\/pre>\n
\u4e0a\u8ff0\u793a\u4f8b\u4ee3\u7801\u4f7f\u7528 mydate1<\/code> \u7684 repr()<\/code> \u5b57\u7b26\u4e32\u521b\u5efa mydate2<\/code> \u5bf9\u8c61\uff0c\u7136\u540e\u9a8c\u8bc1\u4e24\u4e2a\u5bf9\u8c61\u7684\u503c\u662f\u5426\u76f8\u7b49\u3002<\/p>\n
\u4f7f\u7528\u65b0\u7c7b\u793a\u4f8b __str__()<\/code> \u548c __repr__()<\/code> \u51fd\u6570<\/h2>\n
\u521b\u5efa\u4e00\u4e2a\u7c7b\u65f6\uff0c\u5e94\u81f3\u5c11\u5b9e\u73b0 __repr__()<\/code> \u65b9\u6cd5\uff0c\u4ee5\u4fbf\u5728\u5185\u7f6e\u51fd\u6570\u4f7f\u7528 __repr__()<\/code> \u65f6\u8fd4\u56de\u6709\u7528\u7684\u4fe1\u606f\u3002<\/p>\n
\u4ee5\u4e0b\u7684\u7c7b\u6ca1\u6709\u5b9e\u73b0 __str__()<\/code> \u6216 __repr__()<\/code> \u65b9\u6cd5\uff1a<\/p>\n
class<\/span> Ocean<\/span>:<\/span>\r\n\r\n    def<\/span> __init__<\/span>(<\/span>self,<\/span> sea_creature_name,<\/span> sea_creature_age)<\/span>:<\/span>\r\n        self.<\/span>name =<\/span> sea_creature_name\r\n        self.<\/span>age =<\/span> sea_creature_age\r\n\r\nc =<\/span> Ocean(<\/span>'Jellyfish'<\/span>,<\/span> 5<\/span>)<\/span>\r\n\r\nprint<\/span>(<\/span>str<\/span>(<\/span>c)<\/span>)<\/span>\r\nprint<\/span>(<\/span>repr<\/span>(<\/span>c)<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u5f53\u4f60\u4f7f\u7528 str()<\/code> \u548c repr()<\/code> \u65f6\u7684\u8f93\u51fa\u7ed3\u679c\u662f\uff1a<\/p>\n
<\/code><\/pre>\n
\u8f93\u51fa<\/div>\n
\u8fd9\u662f\u6587\u7ae0\u300a\u5728Python\u4e2d\u5982\u4f55\u4f7f\u7528__str__()<\/code>\u548c__repr__()<\/code>\u65b9\u6cd5\u300b\u7684\u7b2c3\u90e8\u5206\uff08\u51713\u90e8\u5206\uff09\u3002<\/p>\n
<__main__.Ocean object at 0x102892860>\r\n<__main__.Ocean object at 0x102892860><\/code><\/pre>\n
\u524d\u9762\u7684\u4f8b\u5b50\u8bc1\u660e\u4e86\u5bf9\u8c61\u7684__repr__()<\/code>\u7684\u9ed8\u8ba4\u5b9e\u73b0\u8fd4\u56de\u4e00\u4e2a\u53ea\u5305\u542b\u7c7b\u540d\u548c\u5bf9\u8c61ID\uff08\u5341\u516d\u8fdb\u5236\u683c\u5f0f\uff09\u7684\u5b57\u7b26\u4e32\uff0c\u8fd9\u5e76\u4e0d\u662f\u5f88\u6709\u7528\u3002\u8bf7\u6ce8\u610f\uff0cstr()<\/code>\u548crepr()<\/code>\u8fd4\u56de\u76f8\u540c\u7684\u503c\uff0c\u56e0\u4e3a\u5f53__str__()<\/code>\u672a\u5b9e\u73b0\u65f6\uff0cstr()<\/code>\u4f1a\u8c03\u7528__repr__()<\/code>\u3002<\/p>\n
\u73b0\u5728\uff0c\u6211\u4eec\u66f4\u65b0Ocean<\/code>\u7c7b\uff0c\u5b9e\u73b0__str__()<\/code>\u548c__repr__()<\/code>\u65b9\u6cd5\u7684\u529f\u80fd\u3002<\/p>\n
class<\/span> Ocean<\/span>:<\/span>\r\n\r\n    def<\/span> __init__<\/span>(<\/span>self,<\/span> sea_creature_name,<\/span> sea_creature_age)<\/span>:<\/span>\r\n        self.<\/span>name =<\/span> sea_creature_name\r\n        self.<\/span>age =<\/span> sea_creature_age\r\n    \r\n    def<\/span> __str__<\/span>(<\/span>self)<\/span>:<\/span><\/mark>\r\n        return<\/span> f'\u751f\u7269\u7c7b\u578b\u662f <\/span>{<\/span>self.<\/span>name}<\/span><\/span>\uff0c\u5e74\u9f84\u662f <\/span>{<\/span>self.<\/span>age}<\/span><\/span><\/span><\/mark>'<\/span><\/span>\r\n\r\n    def<\/span> __repr__<\/span>(<\/span>self)<\/span>:<\/span><\/mark>\r\n        return<\/span> f'Ocean(\\'<\/span>{<\/span>self.<\/span>name}<\/span><\/span>\\', <\/span>{<\/span>self.<\/span>age}<\/span><\/span><\/span><\/mark>)'<\/span><\/span>\r\n\r\nc =<\/span> Ocean(<\/span>'Jellyfish'<\/span>,<\/span> 5<\/span>)<\/span>\r\n\r\nprint<\/span>(<\/span>str<\/span>(<\/span>c)<\/span>)<\/span>\r\nprint<\/span>(<\/span>repr<\/span>(<\/span>c)<\/span>)<\/span><\/code><\/pre>\n
\u8f93\u51fa\u7ed3\u679c\u4e3a\uff1a<\/p>\n
\u8f93\u51fa<\/div>\n
\u751f\u7269\u7c7b\u578b\u662f Jellyfish\uff0c\u5e74\u9f84\u662f 5\r\nOcean('Jellyfish', 5)<\/code><\/pre>\n
\u5728\u524d\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c__str__()<\/code>\u7684\u5b9e\u73b0\u8fd4\u56de\u4e00\u4e2a\u6613\u4e8e\u9605\u8bfb\u7684\u5b57\u7b26\u4e32\uff0c\u4e3a\u7528\u6237\u63d0\u4f9b\u5bf9\u8c61\u7684\u76f8\u5173\u7ec6\u8282\u3002__repr__()<\/code>\u7684\u5b9e\u73b0\u8fd4\u56de\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u5b83\u662f\u4e00\u4e2a\u6709\u6548\u7684Python\u8868\u8fbe\u5f0f\uff0c\u53ef\u4ee5\u7528\u6765\u91cd\u65b0\u521b\u5efa\u5bf9\u8c61\uff1aOcean('Jellyfish', 5)<\/code>\u3002\u8be5\u4f8b\u5b50\u4f7f\u7528f-string\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\uff0c\u4f46\u60a8\u53ef\u4ee5\u4f7f\u7528Python\u652f\u6301\u7684\u4efb\u4f55\u683c\u5f0f\u6765\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u3002<\/p>\n
\u7ed3\u8bba<\/h2>\n
\u5728\u672c\u6587\u4e2d\uff0c\u60a8\u63a2\u8ba8\u4e86__str__()<\/code>\u548c__repr__()<\/code>\u65b9\u6cd5\u4e4b\u95f4\u7684\u533a\u522b\uff0c\u5e76\u5728\u4e00\u4e2a\u7c7b\u4e2d\u5b9e\u73b0\u4e86\u8fd9\u4e9b\u7279\u6b8a\u65b9\u6cd5\uff0c\u8fd9\u6837\u60a8\u5c31\u4e0d\u9700\u8981\u76f4\u63a5\u8c03\u7528\u5b83\u4eec\u3002\u901a\u8fc7\u6211\u4eec\u7684Python\u5b57\u7b26\u4e32\u6559\u7a0b\uff0c\u60a8\u53ef\u4ee5\u8fdb\u4e00\u6b65\u4e86\u89e3\u5982\u4f55\u4f7f\u7528Python\u5904\u7406\u5b57\u7b26\u4e32\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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