{"id":78775,"date":"2026-02-28T08:24:48","date_gmt":"2026-02-28T00:24:48","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/78775.html"},"modified":"2026-02-28T08:24:48","modified_gmt":"2026-02-28T00:24:48","slug":"python-%e7%b2%be%e8%bf%9b%e7%b3%bb%e5%88%97%e4%b8%80%ef%bc%89_-python-_is_-and-__%ef%bc%8c90-%e7%9a%84%e6%96%b0%e6%89%8b%e9%83%bd%e8%b8%a9%e8%bf%87%e7%9a%84%e5%9d%91_2026-02-27","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/78775.html","title":{"rendered":"python \u7cbe\u8fdb\u7cfb\u5217(\u4e00\uff09_ python _is_ and _==_\uff0c90% \u7684\u65b0\u624b\u90fd\u8e29\u8fc7\u7684\u5751_2026-02-27"},"content":{"rendered":"

\u5728 Python \u8c03\u8bd5\u8fc7\u7a0b\u4e2d，== \u548c is \u6df7\u7528\u5bfc\u81f4\u7684 bug \u5c61\u89c1\u4e0d\u9c9c\u3002\u8fd9\u4e24\u4e2a\u770b\u4f3c\u529f\u80fd\u76f8\u4f3c\u7684\u64cd\u4f5c\u7b26，\u80cc\u540e\u5374\u5bf9\u5e94\u7740\u5b8c\u5168\u4e0d\u540c\u7684\u5e95\u5c42\u903b\u8f91\u3002\u672c\u6587\u5c06\u4ece\u5b98\u65b9\u5b9a\u4e49\u3001\u5b9e\u9645\u6848\u4f8b\u3001\u5e95\u5c42\u539f\u7406\u4e09\u4e2a\u7ef4\u5ea6，\u5f7b\u5e95\u8bb2\u6e05\u695a\u5b83\u4eec\u7684\u533a\u522b，\u5e2e\u4f60\u907f\u5f00\u8e29\u5751\u3002<\/p>\n

\u4e00\u3001\u6838\u5fc3\u5b9a\u4e49：\u503c\u76f8\u7b49 vs \u5bf9\u8c61\u540c\u4e00\u6027<\/h3>\n

\u5148\u660e\u786e\u4e24\u4e2a\u6838\u5fc3\u6982\u5ff5，\u8fd9\u662f\u7406\u89e3\u533a\u522b\u7684\u57fa\u7840：<\/p>\n\n\u64cd\u4f5c\u7b26\u5b98\u65b9\u5b9a\u4e49\u901a\u4fd7\u7406\u89e3\u5e95\u5c42\u5224\u65ad\u4f9d\u636e<\/tr>\n\n\n\n
==<\/td>\nEquality（\u76f8\u7b49\u6027）<\/td>\n\u68c0\u67e5\u4e24\u4e2a\u5bf9\u8c61\u7684\u5185\u5bb9 \/ \u503c\u662f\u5426\u4e00\u81f4<\/td>\n\u8c03\u7528\u5bf9\u8c61\u7684 eq() \u65b9\u6cd5<\/td>\n<\/tr>\n
is<\/td>\nIdentity（\u540c\u4e00\u6027）<\/td>\n\u68c0\u67e5\u4e24\u4e2a\u53d8\u91cf\u662f\u5426\u6307\u5411\u5185\u5b58\u4e2d\u540c\u4e00\u4e2a\u5bf9\u8c61<\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4ece\u73b0\u8c61\u770b\u672c\u8d28<\/h3>\n

Case 1：\u6574\u6570（\u5c0f\u6574\u6570\u6c60）<\/h4>\n

a = 1
\nb = 1
\nprint(a == b) # \u8f93\u51fa：True（\u503c\u76f8\u7b49）
\nprint(a is b) # \u8f93\u51fa：True（\u6307\u5411\u540c\u4e00\u4e2a\u5bf9\u8c61）<\/p>\n

\u539f\u56e0：Python \u4e3a\u4e86\u63d0\u5347\u6027\u80fd，\u4f1a\u9884\u5148\u521b\u5efa\u5e76\u7f13\u5b58\u300c\u5c0f\u6574\u6570\u6c60\u300d（\u9ed8\u8ba4\u8303\u56f4：-5 ~ 256）\u3002\u5f53\u4f60\u7ed9\u53d8\u91cf\u8d4b\u503c\u4e3a\u8fd9\u4e2a\u8303\u56f4\u5185\u7684\u6574\u6570\u65f6，\u4e0d\u4f1a\u65b0\u5efa\u5bf9\u8c61，\u800c\u662f\u76f4\u63a5\u5f15\u7528\u7f13\u5b58\u4e2d\u7684\u5bf9\u8c61\u3002\u56e0\u6b64 a \u548c b \u6307\u5411\u5185\u5b58\u4e2d\u540c\u4e00\u4e2a 1\u3002
\n\u6ce8\u610f：\u5982\u679c\u6574\u6570\u8d85\u51fa\u8fd9\u4e2a\u8303\u56f4（\u6bd4\u5982 a=1000; b=1000），a is b \u901a\u5e38\u4f1a\u8fd4\u56de False（\u4e0d\u540c\u73af\u5883\u53ef\u80fd\u6709\u5dee\u5f02），\u4f46 a == b \u4ecd\u4e3a True\u3002<\/p>\n

\u6848\u4f8b 2：\u6d6e\u70b9\u6570<\/h4>\n

c = 1.0
\nd = 1.0
\nprint(c == d) # \u8f93\u51fa：True（\u503c\u76f8\u7b49）
\nprint(c is d) # \u8f93\u51fa：True（\u591a\u6570\u73af\u5883\u4e0b，\u7b80\u5355\u6d6e\u70b9\u6570\u4e5f\u4f1a\u7f13\u5b58）<\/p>\n

\u6d6e\u70b9\u6570\u7684\u7f13\u5b58\u673a\u5236\u4e0d\u5982\u6574\u6570\u7a33\u5b9a，\u590d\u6742\u6d6e\u70b9\u6570（\u5982 1.23456）\u5927\u6982\u7387\u4e0d\u4f1a\u88ab\u7f13\u5b58，\u6b64\u65f6 is \u4f1a\u8fd4\u56de False，\u4f46 == \u59cb\u7ec8\u4ee5\u503c\u4e3a\u51c6\u3002<\/p>\n

\u6848\u4f8b 3：\u5b57\u7b26\u4e32（\u5b57\u7b26\u4e32\u9a7b\u7559）<\/h4>\n

# \u7b80\u5355\u5b57\u7b26\u4e32
\ne = "abc"
\nf = "abc"
\nprint(e == f) # \u8f93\u51fa：True
\nprint(e is f) # \u8f93\u51fa：True<\/p>\n

# \u5e26\u7a7a\u683c\u7684\u5b57\u7b26\u4e32
\na = "hello world"
\nb = "hello world"
\nprint(a == b) # \u8f93\u51fa：True
\nprint(a is b) # \u8f93\u51fa：True（\u591a\u6570\u73af\u5883\u4e0b\u89e6\u53d1\u9a7b\u7559）<\/p>\n

\u539f\u56e0：
\nPython \u5bf9\u4e0d\u53ef\u53d8\u3001\u7b80\u5355\u7684\u5b57\u7b26\u4e32\u4f1a\u89e6\u53d1\u300c\u5b57\u7b26\u4e32\u9a7b\u7559（Interning）\u300d\u673a\u5236 \u2014\u2014 \u5185\u5bb9\u76f8\u540c\u7684\u5b57\u7b26\u4e32\u5171\u7528\u540c\u4e00\u4e2a\u5185\u5b58\u5730\u5740，\u76ee\u7684\u662f\u8282\u7701\u5185\u5b58\u3002\u4f46\u8fd9\u4e2a\u673a\u5236\u4e0d\u662f\u7edd\u5bf9\u7684：
\n\u5305\u542b\u7279\u6b8a\u5b57\u7b26 \/ \u590d\u6742\u62fc\u63a5\u7684\u5b57\u7b26\u4e32（\u5982 \u201chello\u201d + " world"）\u53ef\u80fd\u4e0d\u88ab\u9a7b\u7559；
\n\u52a8\u6001\u751f\u6210\u7684\u5b57\u7b26\u4e32（\u5982 str(123)）\u901a\u5e38\u4e0d\u88ab\u9a7b\u7559\u3002<\/p>\n

\u6848\u4f8b 4：\u5217\u8868（\u53ef\u53d8\u5bf9\u8c61）<\/h4>\n

g = [1, 2, 3]
\nh = [1, 2, 3]
\nprint(g == h) # \u8f93\u51fa：True（\u503c\u5b8c\u5168\u76f8\u540c）
\nprint(id(g)) # \u8f93\u51fa：3108129548864（\u793a\u4f8b\u5730\u5740）
\nprint(id(h)) # \u8f93\u51fa：3108132618432（\u793a\u4f8b\u5730\u5740）
\nprint(g is h) # \u8f93\u51fa：False（\u4e0d\u540c\u5185\u5b58\u5730\u5740）<\/p>\n

\u539f\u56e0：\u5217\u8868\u662f\u53ef\u53d8\u5bf9\u8c61，\u6bcf\u6b21\u6267\u884c [1,2,3] \u65f6，Python \u90fd\u4f1a\u5728\u5185\u5b58\u4e2d\u65b0\u5efa\u4e00\u4e2a\u72ec\u7acb\u7684\u5217\u8868\u5bf9\u8c61\u3002\u54ea\u6015\u5185\u5bb9\u5b8c\u5168\u4e00\u6837，\u5b83\u4eec\u4e5f\u662f\u4e24\u4e2a\u4e0d\u540c\u7684\u300c\u5bb9\u5668\u300d，\u56e0\u6b64 id \u4e0d\u540c，is \u8fd4\u56de False\u3002<\/p>\n

\u6848\u4f8b 5：\u76f4\u63a5\u8d4b\u503c（\u5f15\u7528\u4f20\u9012）<\/h4>\n

a = [1, 2, 3]
\nb = a # \u5c06b\u6307\u5411a\u7684\u5185\u5b58\u5730\u5740
\nprint(a is b) # \u8f93\u51fa：True（\u540c\u4e00\u4e2a\u5bf9\u8c61）
\nprint(a == b) # \u8f93\u51fa：True（\u503c\u81ea\u7136\u76f8\u7b49）<\/p>\n

# \u9a8c\u8bc1：\u4fee\u6539b\u4f1a\u5f71\u54cda
\nb.append(4)
\nprint(a) # \u8f93\u51fa：[1,2,3,4]<\/p>\n

\u7ed3\u8bba：b = a \u4e0d\u662f\u590d\u5236\u5bf9\u8c61，\u800c\u662f\u7ed9\u540c\u4e00\u4e2a\u5bf9\u8c61\u65b0\u589e\u4e00\u4e2a\u300c\u522b\u540d\u300d（\u5f15\u7528）\u3002\u6b64\u65f6 a \u548c b \u6307\u5411\u540c\u4e00\u5757\u5185\u5b58，is \u5fc5\u7136\u8fd4\u56de True\u3002<\/p>\n

\u4e09\u3001\u4ec0\u4e48\u65f6\u5019\u7528 ==？\u4ec0\u4e48\u65f6\u5019\u7528 is？<\/h3>\n

1.\u5224\u65ad\u503c\u662f\u5426\u76f8\u7b49 \u2192 \u7528 ==（90% \u7684\u573a\u666f）<\/h4>\n

# \u6b63\u786e\u7528\u6cd5：\u5224\u65ad\u7528\u6237\u8f93\u5165\u662f\u5426\u4e3a"exit"
\nuser_input = input("\u8bf7\u8f93\u5165：")
\nif user_input == "exit":
\n print("\u9000\u51fa\u7a0b\u5e8f")<\/p>\n

2.\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u4e3a\u540c\u4e00\u4e2a \u2192 \u7528 is（\u7279\u5b9a\u573a\u666f）<\/h4>\n

# \u6b63\u786e\u7528\u6cd5：\u5224\u65ad\u662f\u5426\u4e3aNone
\nif data is None:
\n print("\u6570\u636e\u4e3a\u7a7a")<\/p>\n

# \u9519\u8bef\u7528\u6cd5（\u4e0d\u62a5\u9519，\u4f46\u4e0d\u89c4\u8303）
\nif data == None:
\n pass<\/p>\n

\u56db\u3001\u603b\u7ed3<\/h3>\n

== \u6bd4\u8f83\u503c\u76f8\u7b49，is \u6bd4\u8f83\u5bf9\u8c61\u540c\u4e00\u6027（\u5185\u5b58\u5730\u5740）；
\n\u4e0d\u53ef\u53d8\u5bf9\u8c61（\u6574\u6570\u3001\u5b57\u7b26\u4e32）\u53ef\u80fd\u56e0 Python \u7f13\u5b58 \/ \u9a7b\u7559\u673a\u5236，\u5bfc\u81f4\u5185\u5bb9\u76f8\u540c\u7684\u53d8\u91cf\u6307\u5411\u540c\u4e00\u4e2a\u5bf9\u8c61（is \u8fd4\u56de True），\u4f46\u8fd9\u662f\u4f18\u5316\u884c\u4e3a，\u4e0d\u80fd\u4f9d\u8d56；
\n\u53ef\u53d8\u5bf9\u8c61（\u5217\u8868\u3001\u5b57\u5178\u3001\u96c6\u5408）\u53ea\u8981\u662f\u65b0\u5efa\u7684（\u5982 []\u3001{}），\u54ea\u6015\u5185\u5bb9\u76f8\u540c，is \u4e5f\u8fd4\u56de False；
\n\u5b9e\u9645\u5f00\u53d1\u4e2d，\u4f18\u5148\u7528 == \u5224\u65ad\u503c，\u4ec5\u5728\u5224\u65ad None \u6216\u9a8c\u8bc1\u5bf9\u8c61\u5f15\u7528\u65f6\u7528 is\u3002
\n\u638c\u63e1 == \u548c is \u7684\u533a\u522b，\u4e0d\u4ec5\u80fd\u907f\u514d\u8c03\u8bd5\u65f6\u7684\u5751，\u66f4\u80fd\u52a0\u6df1\u5bf9 Python\u300c\u4e00\u5207\u7686\u5bf9\u8c61\u300d\u548c\u300c\u5f15\u7528\u4f20\u9012\u300d\u6838\u5fc3\u7279\u6027\u7684\u7406\u89e3\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u5728 Python \u8c03\u8bd5\u8fc7\u7a0b\u4e2d， \u548c is \u6df7\u7528\u5bfc\u81f4\u7684 bug \u5c61\u89c1\u4e0d\u9c9c\u3002\u8fd9\u4e24\u4e2a\u770b\u4f3c\u529f\u80fd\u76f8\u4f3c\u7684\u64cd\u4f5c\u7b26，\u80cc\u540e\u5374\u5bf9\u5e94\u7740\u5b8c\u5168\u4e0d\u540c\u7684\u5e95\u5c42\u903b\u8f91\u3002\u672c\u6587\u5c06\u4ece\u5b98\u65b9\u5b9a\u4e49\u3001\u5b9e\u9645\u6848\u4f8b\u3001\u5e95\u5c42\u539f\u7406\u4e09\u4e2a\u7ef4\u5ea6，\u5f7b\u5e95\u8bb2\u6e05\u695a\u5b83\u4eec\u7684\u533a\u522b，\u5e2e\u4f60\u907f\u5f00\u8e29\u5751\u3002
\n\u4e00\u3001\u6838\u5fc3\u5b9a\u4e49：\u503c\u76f8\u7b49 vs \u5bf9\u8c61\u540c\u4e00\u6027
\n\u5148\u660e\u786e\u4e24\u4e2a\u6838\u5fc3\u6982\u5ff5，\u8fd9\u662f\u7406\u89e3\u533a\u522b\u7684\u57fa\u7840：\u64cd\u4f5c\u7b26\u5b98\u65b9\u5b9a\u4e49\u901a\u4fd7\u7406\u89e3\u5e95\u5c42\u5224\u65ad\u4f9d\u636eEquality（\u76f8\u7b49\u6027&#xff09<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,81,101],"topic":[],"class_list":["post-78775","post","type-post","status-publish","format-standard","hentry","category-server","tag-java","tag-python","tag-spring"],"yoast_head":"\npython \u7cbe\u8fdb\u7cfb\u5217(\u4e00\uff09_ python _is_ and _==_\uff0c90% \u7684\u65b0\u624b\u90fd\u8e29\u8fc7\u7684\u5751_2026-02-27 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/78775.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"python \u7cbe\u8fdb\u7cfb\u5217(\u4e00\uff09_ python _is_ and _==_\uff0c90% \u7684\u65b0\u624b\u90fd\u8e29\u8fc7\u7684\u5751_2026-02-27 - 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