{"id":177015,"date":"2024-05-08T19:22:07","date_gmt":"2024-05-08T11:22:07","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/177015.html"},"modified":"2024-05-08T19:22:11","modified_gmt":"2024-05-08T11:22:11","slug":"python-eval500-10%e6%9c%80%e5%90%8e%e7%bb%93%e6%9e%9c%e6%80%8e%e4%b9%88%e6%98%af50-0%e4%b8%8d%e6%98%af50","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/177015.html","title":{"rendered":"python eval(‘500\/10’)\u6700\u540e\u7ed3\u679c\u600e\u4e48\u662f50.0\u4e0d\u662f50"},"content":{"rendered":"

\"python<\/p>\n

Python \u4e2d\u7684 eval<\/code> \u51fd\u6570<\/strong>\u6267\u884c\u5b57\u7b26\u4e32\u8868\u8fbe\u5f0f\u5e76\u8fd4\u56de\u7ed3\u679c\u3002\u5f53\u4f60\u4f7f\u7528eval('500\/10')<\/code>\u65f6\uff0c\u4f60\u4f1a\u5f97\u523050.0<\/code>\u800c\u4e0d\u662f50<\/code>\uff0c\u8fd9\u662f\u56e0\u4e3aPython\u5728\u6267\u884c\u9664\u6cd5\u64cd\u4f5c\/<\/code>\u65f6\uff0c\u9ed8\u8ba4\u5f97\u5230\u7684\u7ed3\u679c\u662f\u6d6e\u70b9\u6570\u3002\u8fd9\u4e00\u884c\u4e3a\u65e8\u5728\u4fdd\u7565\u53ef\u80fd\u7684\u5c0f\u6570\u90e8\u5206\uff0c\u786e\u4fdd\u6570\u5b66\u8ba1\u7b97\u7684\u7cbe\u786e\u6027\u3002<\/p>\n<\/p>\n

\u6d6e\u70b9\u6570\uff0c\u901a\u5e38\u8868\u793a\u5e26\u5c0f\u6570\u70b9\u7684\u6570\u5b57\uff0c\u5373\u4fbf\u8fd9\u4e2a\u6570\u5b57\u662f\u4e00\u4e2a\u6574\u6570\u9664\u4ee5\u53e6\u4e00\u4e2a\u6574\u6570\u7684\u60c5\u51b5\u3002\u81eaPython 3\u8d77\uff0c\u5373\u4f7f\u4e24\u4e2a\u64cd\u4f5c\u6570\u90fd\u662f\u6574\u6570\uff0c\u9664\u6cd5\u8fd0\u7b97\/<\/code>\u4ecd\u7136\u8fd4\u56de\u6d6e\u70b9\u7ed3\u679c\u3002\u8fd9\u4e2a\u53d8\u5316\u662fPython 3\u5f15\u5165\u7684\uff0c\u4e3b\u8981\u662f\u4e3a\u4e86\u8ba9\u9664\u6cd5\u7684\u884c\u4e3a\u66f4\u52a0\u7b26\u5408\u6570\u5b66\u4e0a\u7684\u671f\u671b\uff0c\u907f\u514d\u7531\u4e8e\u6574\u6570\u9664\u6cd5\u5bfc\u81f4\u7684\u610f\u5916\u7684\u622a\u65ad\u884c\u4e3a\uff0c\u5c24\u5176\u662f\u5728\u6570\u503c\u5206\u6790\u548c\u79d1\u5b66\u8ba1\u7b97\u4e2d\u3002<\/p>\n<\/p>\n

\u4e3a\u4ec0\u4e48\u4f7f\u7528\/<\/code>\u4f1a\u5f97\u5230\u6d6e\u70b9\u6570<\/strong><\/h3>\n<\/p>\n

\u5728Python\u4e2d\u8fdb\u884c\u6570\u5b66\u8fd0\u7b97\u65f6\uff0c\u9664\u6cd5\u6709\u4e24\u79cd\u5f62\u5f0f\uff1a\/<\/code>\u548c\/\/<\/code>\u3002\/<\/code>\u662f\u6807\u51c6\u9664\u6cd5\uff0c\u65e0\u8bba\u8f93\u5165\u662f\u6574\u6570\u8fd8\u662f\u6d6e\u70b9\u6570\uff0c\u90fd\u4f1a\u8fd4\u56de\u4e00\u4e2a\u6d6e\u70b9\u6570\u7ed3\u679c\uff1b\u800c\/\/<\/code>\u662f\u5730\u677f\u9664\u6cd5\uff0c\u5b83\u4f1a\u8fd4\u56de\u8fd0\u7b97\u540e\u7684\u6574\u6570\u90e8\u5206\uff0c\u820d\u53bb\u5c0f\u6570\u90e8\u5206\u3002<\/p>\n<\/p>\n

\u6807\u51c6\u9664\u6cd5 vs \u5730\u677f\u9664\u6cd5<\/strong><\/h3>\n<\/p>\n

\u6807\u51c6\u9664\u6cd5\uff1a<\/strong><\/p>\n<\/p>\n

# \u4f7f\u7528\u6807\u51c6\u9664\u6cd5<\/p>\n
result = 500 \/ 10<\/p>\n
\u7ed3\u679c\uff1a50.0<\/strong><\/h2>\n
<\/code><\/pre>\n<\/p>\n
\u5730\u677f\u9664\u6cd5\uff1a<\/strong><\/p>\n<\/p>\n
# \u4f7f\u7528\u5730\u677f\u9664\u6cd5<\/p>\n
result = 500 \/\/ 10<\/p>\n
\u7ed3\u679c\uff1a50<\/strong><\/h2>\n
<\/code><\/pre>\n<\/p>\n
\u5982\u679c\u4f60\u60f3\u901a\u8fc7eval<\/code>\u5f97\u5230\u6574\u6570\u7ed3\u679c\uff0c\u5e94\u8be5\u5c06\u8868\u8fbe\u5f0f\u6539\u4e3a\u4f7f\u7528\u5730\u677f\u9664\/\/<\/code>\u3002\u4f8b\u5982\uff1aeval('500\/\/10')<\/code>\u3002<\/p>\n<\/p>\n
\u6d6e\u70b9\u6570\u7684\u4f18\u70b9\u4e0e\u6ce8\u610f\u4e8b\u9879<\/strong><\/h3>\n<\/p>\n
\u4f18\u70b9\uff1a<\/strong><\/p>\n<\/p>\n
    \n
  1. \u7cbe\u5ea6\uff1a\u6d6e\u70b9\u6570\u80fd\u66f4\u7cbe\u786e\u5730\u8868\u793a\u5404\u79cd\u5206\u6570\u548c\u5c0f\u6570\uff0c\u8fd9\u5728\u79d1\u5b66\u8ba1\u7b97\u4e2d\u7279\u522b\u91cd\u8981\u3002<\/li>\n
  2. \u901a\u7528\u6027\uff1a\u6d6e\u70b9\u6570\u7684\u4f7f\u7528\u7b80\u5316\u4e86\u7b97\u672f\u8fd0\u7b97\u7684\u89c4\u5219\uff0c\u5c24\u5176\u662f\u6d89\u53ca\u9664\u6cd5\u65f6\u53ef\u4ee5\u4e0d\u5fc5\u62c5\u5fc3\u662f\u5426\u5e94\u8be5\u4ea7\u751f\u6574\u6570\u7ed3\u679c\u3002<\/li>\n<\/ol>\n
    \u6ce8\u610f\u4e8b\u9879\uff1a<\/strong><\/p>\n<\/p>\n
      \n
    1. \n
      \u8868\u793a\u9650\u5236\uff1a\u6d6e\u70b9\u6570\u4e0d\u80fd\u7cbe\u786e\u8868\u793a\u6240\u6709\u7684\u5b9e\u6570\uff0c\u7279\u522b\u662f\u5bf9\u4e8e\u8d85\u51fa\u6d6e\u70b9\u6570\u7cbe\u5ea6\u7684\u5927\u6570\u6216\u975e\u5e38\u7cbe\u786e\u7684\u5c0f\u6570\u8fd0\u7b97\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u8fd1\u4f3c\u8bef\u5dee\u3002<\/p>\n<\/p>\n<\/li>\n
    2. \n
      \u6027\u80fd\u8003\u8651\uff1a\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6574\u6570\u8fd0\u7b97\u53ef\u80fd\u6bd4\u6d6e\u70b9\u8fd0\u7b97\u5177\u6709\u66f4\u9ad8\u7684\u6027\u80fd\u3002<\/p>\n<\/p>\n<\/li>\n
    3. \n
      \u7cbe\u5ea6\u9700\u6c42\uff1a\u5f53\u9700\u8981\u4e25\u683c\u7684\u6574\u6570\u5904\u7406\uff0c\u5982\u7d22\u5f15\u3001\u8ba1\u6570\u6216\u4e0e\u5916\u90e8\u6574\u6570\u7c7b\u578b\u63a5\u53e3\u4e92\u52a8\u65f6\uff0c\u5e94\u8be5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6d6e\u70b9\u6570\u8fd0\u7b97\u3002<\/p>\n<\/p>\n<\/li>\n<\/ol>\n
      \u5728\u8fdb\u884c\u7f16\u7a0b\u65f6\uff0c\u4e86\u89e3\u5404\u79cd\u6570\u5b66\u8fd0\u7b97\u548c\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\u7c7b\u578b\u5bf9\u4e8e\u7f16\u5199\u6b63\u786e\u548c\u9ad8\u6548\u7684\u4ee3\u7801\u81f3\u5173\u91cd\u8981\u3002\u4f7f\u7528Python\u65f6\uff0c\u5bf9\u4e8e\u50cfeval<\/code>\u8fd9\u6837\u7684\u51fd\u6570\uff0c\u59cb\u7ec8\u8981\u6e05\u695a\u5176\u5982\u4f55\u89e3\u6790\u548c\u6267\u884c\u5b57\u7b26\u4e32\u5f62\u5f0f\u7684\u4ee3\u7801\u7247\u6bb5\uff0c\u4ee5\u53ca\u8fd9\u4f1a\u5bf9\u7ed3\u679c\u6570\u636e\u7c7b\u578b\u4ea7\u751f\u4ec0\u4e48\u5f71\u54cd\u3002<\/p>\n<\/p>\n
      \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
      \u4e3a\u4ec0\u4e48\u4f7f\u7528Python\u7684eval\u51fd\u6570\u8ba1\u7b97500\u9664\u4ee510\u7684\u7ed3\u679c\u662f50.0\u800c\u4e0d\u662f50\uff1f<\/strong><\/p>\n
      eval\u51fd\u6570\u5728Python\u4e2d\u88ab\u7528\u4e8e\u5bf9\u5b57\u7b26\u4e32\u8868\u8fbe\u5f0f\u8fdb\u884c\u6c42\u503c\u3002\u5f53\u5b57\u7b26\u4e32\u8868\u8fbe\u5f0f\u4e2d\u5b58\u5728\u6d6e\u70b9\u6570\u65f6\uff0ceval\u51fd\u6570\u4f1a\u8fd4\u56de\u6d6e\u70b9\u6570\u7ed3\u679c\u3002\u56e0\u6b64\uff0c\u8ba1\u7b97500\u9664\u4ee510\u7684\u7ed3\u679c\u65f6\uff0ceval\u51fd\u6570\u4f1a\u5c06\u7ed3\u679c\u8f6c\u6362\u4e3a\u6d6e\u70b9\u6570\uff0c\u537350.0\u3002<\/p>\n
      \u5982\u4f55\u8ba9Python\u7684eval\u51fd\u6570\u8fd4\u56de\u6574\u6570\u7ed3\u679c\u800c\u4e0d\u662f\u6d6e\u70b9\u6570\u7ed3\u679c\uff1f<\/strong><\/p>\n
      \u82e5\u5e0c\u671beval\u51fd\u6570\u8fd4\u56de\u6574\u6570\u7ed3\u679c\u800c\u4e0d\u662f\u6d6e\u70b9\u6570\u7ed3\u679c\uff0c\u53ef\u4ee5\u4f7f\u7528Python\u7684int\u51fd\u6570\u5bf9eval\u7684\u7ed3\u679c\u8fdb\u884c\u8f6c\u6362\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528int(eval('500\/10'))\u6765\u83b7\u5f9750\u8fd9\u4e2a\u6574\u6570\u7ed3\u679c\u3002<\/p>\n
      \u6709\u6ca1\u6709\u5176\u4ed6\u8ba1\u7b97\u65b9\u6cd5\u53ef\u4ee5\u5f97\u5230500\u9664\u4ee510\u7684\u6574\u6570\u7ed3\u679c50\u800c\u4e0d\u4f7f\u7528eval\u51fd\u6570\uff1f<\/strong><\/p>\n
      \u662f\u7684\uff0c\u9664\u4e86\u4f7f\u7528eval\u51fd\u6570\u4e4b\u5916\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528\u666e\u901a\u7684\u6570\u5b66\u8fd0\u7b97\u6765\u5f97\u5230500\u9664\u4ee510\u7684\u6574\u6570\u7ed3\u679c50\u3002\u53ef\u4ee5\u4f7f\u7528\u9664\u6cd5\u8fd0\u7b97\u7b26'\/'\u6765\u76f4\u63a5\u8fdb\u884c\u8ba1\u7b97\uff0c\u5982500\/10\u5373\u53ef\u5f97\u5230\u6574\u6570\u7ed3\u679c50\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Python \u4e2d\u7684 eval \u51fd\u6570\u6267\u884c\u5b57\u7b26\u4e32\u8868\u8fbe\u5f0f\u5e76\u8fd4\u56de\u7ed3\u679c\u3002\u5f53\u4f60\u4f7f\u7528eval('500\/10&#0 […]","protected":false},"author":3,"featured_media":177023,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/177015"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=177015"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/177015\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/177023"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=177015"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=177015"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=177015"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}