{"id":2992,"date":"2025-05-28T16:19:17","date_gmt":"2025-06-04T09:13:17","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=2992"},"modified":"2025-06-04T16:19:17","modified_gmt":"2025-06-04T09:13:17","slug":"%e4%ba%86%e8%a7%a3python%e4%b8%ad%e7%9a%84eval%e5%87%bd%e6%95%b8","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/python\/%e4%ba%86%e8%a7%a3python%e4%b8%ad%e7%9a%84eval%e5%87%bd%e6%95%b8\/","title":{"rendered":"2025 \u6700\u65b0\u7248\uff1a\u6df1\u5165\u4e86\u89e3 Python \u7684 eval() \u51fd\u6578\u53ca\u5176\u6700\u4f73\u5be6\u8e10"},"content":{"rendered":"

<\/p>\n

\u6df1\u5165\u4e86\u89e3 Python \u7684 eval() \u51fd\u6578<\/h1>\n

Python \u4e2d\u7684 `eval()` \u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u7528\u4f86\u57f7\u884c\u5b57\u4e32\u5f62\u5f0f\u7684 Python \u8868\u9054\u5f0f\u4e26\u8fd4\u56de\u7d50\u679c\u3002\u5b83\u4e0d\u50c5\u80fd\u8a55\u4f30\u7528\u6236\u8f38\u5165\u7684\u52d5\u614b Python \u8a9e\u53e5\uff0c\u9084\u53ef\u4ee5\u5728\u7a0b\u5f0f\u78bc\u4e2d\u9032\u884c\u8907\u96dc\u7684\u8a08\u7b97\u8207\u904b\u7b97\u3002\u7136\u800c\uff0c\u7531\u65bc\u5176\u6f5b\u5728\u7684\u5b89\u5168\u98a8\u96aa\uff0c\u4f7f\u7528 `eval()` \u6642\u5fc5\u9808\u683c\u5916\u5c0f\u5fc3\u3002<\/p>\n

eval() \u51fd\u6578\u7684\u57fa\u672c\u7528\u6cd5<\/h2>\n

`eval()` \u51fd\u6578\u7684\u57fa\u672c\u7528\u6cd5\u662f\u5c07\u5b57\u4e32\u4f5c\u70ba\u53c3\u6578\u50b3\u905e\u7d66\u5b83\uff0c\u7136\u5f8c\u8a72\u51fd\u6578\u6703\u8a55\u4f30\u8a72\u5b57\u4e32\u4e26\u8fd4\u56de\u5176\u7d50\u679c\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u7bc4\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528 `eval()` \u51fd\u6578\u4f86\u8a08\u7b97\u8868\u9054\u5f0f\uff1a<\/p>\n

“`python
\nresult = eval(“2 + 3”)
\nprint(result)
\n“`<\/p>\n

\u8f38\u51fa\uff1a<\/p>\n

“`
\n5
\n“`<\/p>\n

\u6b64\u5916\uff0c`eval()` \u51fd\u6578\u4e5f\u53ef\u4ee5\u7528\u65bc\u8a55\u4f30\u591a\u884c\u5b57\u4e32\uff0c\u4f8b\u5982\uff1a<\/p>\n

“`python
\nresult = eval(“””
\na = 2
\nb = 3
\na + b
\n“””)<\/p>\n

print(result)
\n“`<\/p>\n

\u8f38\u51fa\uff1a<\/p>\n

“`
\n5
\n“`<\/p>\n

eval() \u51fd\u6578\u7684\u9ad8\u7d1a\u7528\u6cd5<\/h2>\n

`eval()` \u51fd\u6578\u9664\u4e86\u53ef\u4ee5\u8a55\u4f30\u5b57\u4e32\u5916\uff0c\u9084\u53ef\u4ee5\u63a5\u53d7\u5169\u500b\u53ef\u9078\u7684\u53c3\u6578\uff1a`globals` \u548c `locals`\u3002\u9019\u5169\u500b\u53c3\u6578\u5206\u5225\u7528\u65bc\u6307\u5b9a\u5168\u5c40\u8b8a\u91cf\u548c\u5c40\u90e8\u8b8a\u91cf\u7684\u503c\u3002<\/p>\n

\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u7bc4\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528 `globals` \u548c `locals` \u53c3\u6578\uff1a<\/p>\n

“`python
\na = 2
\nb = 3<\/p>\n

result = eval(“a + b”, {“a”: 4, “b”: 5}, {“b”: 6})
\nprint(result)
\n“`<\/p>\n

\u8f38\u51fa\uff1a<\/p>\n

“`
\n9
\n“`<\/p>\n

\u5728\u9019\u6bb5\u7a0b\u5f0f\u78bc\u4e2d\uff0c\u6211\u5011\u5c07 `globals` \u53c3\u6578\u8a2d\u7f6e\u70ba `{“a”: 4, “b”: 5}`\uff0c\u9019\u610f\u5473\u8457\u5728\u8a55\u4f30\u5b57\u4e32\u6642\uff0c`a` \u7684\u503c\u5c07\u70ba 4\uff0c\u800c `b` \u7684\u503c\u5c07\u70ba 5\u3002\u6211\u5011\u4e5f\u8a2d\u7f6e\u4e86 `locals` \u53c3\u6578\u70ba `{“b”: 6}`\uff0c\u9019\u4f7f\u5f97\u5728\u8a55\u4f30\u5b57\u4e32\u6642\uff0c`b` \u7684\u503c\u5c07\u88ab\u66f4\u6539\u70ba 6\u3002\u56e0\u6b64\uff0c\u5b57\u4e32 `”a + b”` \u88ab\u8a55\u4f30\u70ba `4 + 6`\uff0c\u7d50\u679c\u70ba 9\u3002<\/p>\n

\u4f7f\u7528 eval() \u7684\u98a8\u96aa\u53ca\u6700\u4f73\u5be6\u8e10<\/h2>\n

\u96d6\u7136 `eval()` \u51fd\u6578\u975e\u5e38\u6709\u7528\uff0c\u4f46\u5b83\u4e5f\u5b58\u5728\u5b89\u5168\u98a8\u96aa\u3002\u82e5\u7528\u6236\u8f38\u5165\u7684\u5b57\u4e32\u5305\u542b\u60e1\u610f\u4ee3\u78bc\uff0c\u5c07\u6703\u5c0e\u81f4\u5b89\u5168\u6f0f\u6d1e\u3002\u56e0\u6b64\uff0c\u7576\u8655\u7406\u4e0d\u53ef\u4fe1\u7684\u8f38\u5165\u6642\uff0c\u61c9\u907f\u514d\u4f7f\u7528 `eval()`\u3002\u53d6\u800c\u4ee3\u4e4b\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u5176\u4ed6\u65b9\u6cd5\uff0c\u4f8b\u5982 `ast.literal_eval()`\uff0c\u9019\u662f\u4e00\u500b\u66f4\u5b89\u5168\u7684\u9078\u64c7\uff0c\u50c5\u652f\u6301\u57fa\u672c\u7684 Python \u5b57\u9762\u91cf\u3002<\/p>\n

\u6b64\u5916\uff0c\u4f7f\u7528 `eval()` \u6642\uff0c\u5efa\u8b70\u9075\u5faa\u4ee5\u4e0b\u6700\u4f73\u5be6\u8e10\uff1a<\/p>\n

1. **\u6700\u5c0f\u5316\u4f7f\u7528**\uff1a\u50c5\u5728\u5fc5\u8981\u7684\u60c5\u6cc1\u4e0b\u4f7f\u7528 `eval()`\u3002
\n2. **\u9a57\u8b49\u8f38\u5165**\uff1a\u78ba\u4fdd\u4efb\u4f55\u50b3\u905e\u7d66 `eval()` \u7684\u5b57\u4e32\u90fd\u662f\u5b89\u5168\u7684\u3002
\n3. **\u4f7f\u7528\u66ff\u4ee3\u65b9\u6848**\uff1a\u5982\u53ef\u80fd\uff0c\u5c0b\u627e\u5176\u4ed6\u66ff\u4ee3\u65b9\u6848\uff0c\u4f8b\u5982\u4f7f\u7528\u51fd\u6578\u6620\u5c04\u6216\u89e3\u6790\u5668\u3002<\/p>\n

\u82e5\u60f3\u6df1\u5165\u4e86\u89e3 Python \u7684\u5176\u4ed6\u5b89\u5168\u7de8\u78bc\u5be6\u8e10\uff0c\u53ef\u4ee5\u53c3\u8003\u9019\u7bc7\u6587\u7ae0 [Python \u5b89\u5168\u6027\u6700\u4f73\u5be6\u8e10](https:\/\/vocus.cc\/article\/605e3f1d8c53a40001e95f92)\u3002<\/p>\n

\u7e3d\u7d50<\/h2>\n

\u672c\u6587\u4ecb\u7d39\u4e86 Python \u4e2d\u7684 `eval()` \u51fd\u6578\uff0c\u91cd\u9ede\u5728\u65bc\u5b83\u7684\u57fa\u672c\u7528\u6cd5\u548c\u9ad8\u7d1a\u7528\u6cd5\uff0c\u4ee5\u53ca\u4f7f\u7528\u8a72\u51fd\u6578\u6642\u9700\u8981\u8003\u616e\u7684\u5b89\u5168\u98a8\u96aa\u3002\u5118\u7ba1 `eval()` \u51fd\u6578\u5728\u67d0\u4e9b\u60c5\u5883\u4e2d\u975e\u5e38\u6709\u7528\uff0c\u4f46\u5728\u4f7f\u7528\u6642\uff0c\u958b\u767c\u8005\u61c9\u59cb\u7d42\u4fdd\u6301\u8b66\u60d5\uff0c\u78ba\u4fdd\u4ee3\u78bc\u7684\u5b89\u5168\u6027\u3002<\/p>\n

Q&A\uff08\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff09<\/h2>\n

**Q1: eval() \u51fd\u6578\u662f\u5426\u6703\u5f71\u97ff\u7a0b\u5f0f\u7684\u6027\u80fd\uff1f**
\nA1: \u4f7f\u7528 `eval()` \u6703\u5f71\u97ff\u6027\u80fd\uff0c\u56e0\u70ba\u5b83\u9700\u8981\u89e3\u6790\u548c\u57f7\u884c\u5b57\u4e32\u4e2d\u7684 Python \u8868\u9054\u5f0f\u3002\u82e5\u53ef\u907f\u514d\u4f7f\u7528\uff0c\u5efa\u8b70\u9078\u64c7\u5176\u4ed6\u65b9\u6cd5\u3002<\/p>\n

**Q2: \u6709\u4ec0\u9ebc\u66ff\u4ee3 `eval()` \u7684\u65b9\u6cd5\u55ce\uff1f**
\nA2: \u662f\u7684\uff0c\u53ef\u4ee5\u4f7f\u7528 `ast.literal_eval()` \u4f86\u5b89\u5168\u5730\u8a55\u4f30\u5b57\u9762\u91cf\uff0c\u6216\u4f7f\u7528\u81ea\u5b9a\u7fa9\u89e3\u6790\u908f\u8f2f\u4f86\u8655\u7406\u7279\u5b9a\u60c5\u6cc1\u3002<\/p>\n

**Q3: \u5728\u4ec0\u9ebc\u60c5\u6cc1\u4e0b\u61c9\u907f\u514d\u4f7f\u7528 eval()\uff1f**
\nA3: \u7576\u8655\u7406\u4f86\u81ea\u4e0d\u53ef\u4fe1\u4f86\u6e90\u7684\u8f38\u5165\u6642\uff0c\u61c9\u907f\u514d\u4f7f\u7528 `eval()`\uff0c\u56e0\u70ba\u5b83\u53ef\u80fd\u5c0e\u81f4\u5b89\u5168\u6f0f\u6d1e\u3002
\n—<\/p>\n","protected":false},"excerpt":{"rendered":"

eval()\u51fd\u6578\u662fPython\u4e2d\u7684\u4e00\u500b\u91cd\u8981\u51fd\u6578\uff0c\u5b83\u53ef\u4ee5\u5c07\u5b57\u7b26\u4e32\u8f49\u63db\u70baPython\u4ee3\u78bc\uff0c\u53ef\u4ee5\u7528\u65bc\u57f7\u884c\u52d5\u614b\u7684Python\u4ee3\u78bc\uff0c\u4e26\u63d0\u4f9b\u4e86\u4e00\u7a2e\u7c21\u55ae\u7684\u65b9\u6cd5\u4f86\u8a55\u4f30\u8868\u9054\u5f0f\u3002\u672c\u6587\u5c07\u4ecb\u7d39eval()\u51fd\u6578\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u4ee5\u53ca\u5b83\u7684\u512a\u9ede\u548c\u7f3a\u9ede\u3002<\/p>\n","protected":false},"author":1,"featured_media":2518,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[18],"tags":[15],"class_list":["post-2992","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python","tag-python"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/badgameshow.com\/steven\/wp-content\/uploads\/2022\/12\/DALL\u00b7E-2022-12-28-14.25.55-\u62f7\u8c9d2.png","jetpack-related-posts":[],"jetpack_shortlink":"https:\/\/wp.me\/pcFK27-Mg","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/2992","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/comments?post=2992"}],"version-history":[{"count":3,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/2992\/revisions"}],"predecessor-version":[{"id":12982,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/2992\/revisions\/12982"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media\/2518"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=2992"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=2992"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=2992"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}