{"id":1127307,"date":"2025-01-08T20:09:09","date_gmt":"2025-01-08T12:09:09","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1127307.html"},"modified":"2025-01-08T20:09:13","modified_gmt":"2025-01-08T12:09:13","slug":"python%e5%a6%82%e4%bd%95%e5%ae%9a%e4%b9%89%e4%b8%80%e4%b8%aa%e5%8f%98%e9%87%8f%e4%b8%ba%e6%b5%ae%e7%82%b9%e5%9e%8b","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1127307.html","title":{"rendered":"python\u5982\u4f55\u5b9a\u4e49\u4e00\u4e2a\u53d8\u91cf\u4e3a\u6d6e\u70b9\u578b"},"content":{"rendered":"

\"python\u5982\u4f55\u5b9a\u4e49\u4e00\u4e2a\u53d8\u91cf\u4e3a\u6d6e\u70b9\u578b\"<\/p>\n

\u5728Python\u4e2d\uff0c\u5b9a\u4e49\u4e00\u4e2a\u53d8\u91cf\u4e3a\u6d6e\u70b9\u578b\u7684\u65b9\u6cd5\u6709\u51e0\u79cd\uff1a\u76f4\u63a5\u8d4b\u503c\u3001\u4f7f\u7528\u5185\u7f6e\u51fd\u6570\u3001\u4ece\u5176\u4ed6\u6570\u636e\u7c7b\u578b\u8f6c\u6362\u3002<\/strong> \u5176\u4e2d\uff0c\u76f4\u63a5\u8d4b\u503c<\/strong> \u662f\u6700\u5e38\u89c1\u4e14\u6700\u7b80\u5355\u7684\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c\u4f60\u53ef\u4ee5\u901a\u8fc7 x = 3.14<\/code> \u6765\u5b9a\u4e49\u4e00\u4e2a\u6d6e\u70b9\u578b\u53d8\u91cf\u3002\u4e0b\u9762\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u51e0\u79cd\u65b9\u6cd5\u5e76\u63d0\u4f9b\u4e00\u4e9b\u5b9e\u9645\u5e94\u7528\u7684\u4f8b\u5b50\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u76f4\u63a5\u8d4b\u503c<\/h3>\n<\/p>\n

\u76f4\u63a5\u8d4b\u503c\u662f\u5b9a\u4e49\u6d6e\u70b9\u578b\u53d8\u91cf\u6700\u7b80\u5355\u548c\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u3002\u4f60\u53ea\u9700\u8981\u5c06\u4e00\u4e2a\u5c0f\u6570\u70b9\u6570\u503c\u8d4b\u503c\u7ed9\u4e00\u4e2a\u53d8\u91cf\u5373\u53ef\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n

x = 3.14<\/p>\n
y = -0.001<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e9b\u4f8b\u5b50\u4e2d\uff0c\u53d8\u91cf x<\/code> \u548c y<\/code> \u88ab\u8d4b\u503c\u4e3a\u6d6e\u70b9\u578b\u6570\u503c 3.14<\/code> \u548c -0.001<\/code>\u3002Python \u81ea\u52a8\u5c06\u8fd9\u4e9b\u6570\u503c\u8bc6\u522b\u4e3a\u6d6e\u70b9\u578b\u3002<\/p>\n<\/p>\n
\u4f18\u70b9<\/h4>\n<\/p>\n
    \n
  • \u7b80\u5355\u6613\u7528<\/strong>\uff1a\u65e0\u9700\u8c03\u7528\u4efb\u4f55\u51fd\u6570\u6216\u8fdb\u884c\u989d\u5916\u64cd\u4f5c\u3002<\/li>\n
  • \u9ad8\u6548<\/strong>\uff1a\u76f4\u63a5\u5728\u8d4b\u503c\u64cd\u4f5c\u4e2d\u5b8c\u6210\u53d8\u91cf\u5b9a\u4e49\u3002<\/li>\n<\/ul>\n
    \u4e8c\u3001\u4f7f\u7528\u5185\u7f6e\u51fd\u6570<\/h3>\n<\/p>\n
    Python \u63d0\u4f9b\u4e86\u4e00\u4e2a\u5185\u7f6e\u51fd\u6570 float()<\/code>\uff0c\u53ef\u4ee5\u5c06\u5176\u4ed6\u6570\u636e\u7c7b\u578b\u8f6c\u6362\u4e3a\u6d6e\u70b9\u578b\u3002\u8fd9\u5728\u5904\u7406\u5b57\u7b26\u4e32\u6216\u6574\u6570\u65f6\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
    x = float(3)<\/p>\n
    y = float("3.14")<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    \u5728\u8fd9\u4e9b\u4f8b\u5b50\u4e2d\uff0cx<\/code> \u88ab\u8f6c\u6362\u4e3a\u6d6e\u70b9\u578b\u6570\u503c 3.0<\/code>\uff0cy<\/code> \u88ab\u8f6c\u6362\u4e3a\u6d6e\u70b9\u578b\u6570\u503c 3.14<\/code>\u3002<\/p>\n<\/p>\n
    \u4f18\u70b9<\/h4>\n<\/p>\n
      \n
    • \u7075\u6d3b\u6027\u9ad8<\/strong>\uff1a\u53ef\u4ee5\u5c06\u591a\u79cd\u6570\u636e\u7c7b\u578b\u8f6c\u6362\u4e3a\u6d6e\u70b9\u578b\u3002<\/li>\n
    • \u660e\u786e\u6027<\/strong>\uff1a\u901a\u8fc7\u4f7f\u7528 float()<\/code> \u51fd\u6570\uff0c\u4ee3\u7801\u7684\u610f\u56fe\u66f4\u52a0\u6e05\u6670\u3002<\/li>\n<\/ul>\n
      \u4e09\u3001\u4ece\u5176\u4ed6\u6570\u636e\u7c7b\u578b\u8f6c\u6362<\/h3>\n<\/p>\n
      \u6709\u65f6\u4f60\u53ef\u80fd\u9700\u8981\u5c06\u5176\u4ed6\u6570\u636e\u7c7b\u578b\uff08\u5982\u6574\u6570\u3001\u5b57\u7b26\u4e32\uff09\u8f6c\u6362\u4e3a\u6d6e\u70b9\u578b\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f8b\u5b50\uff1a<\/p>\n<\/p>\n
      # \u4ece\u6574\u6570\u8f6c\u6362<\/p>\n
      x = 42<\/p>\n
      x = float(x)<\/p>\n
      \u4ece\u5b57\u7b26\u4e32\u8f6c\u6362<\/strong><\/h2>\n
      y = "3.14159"<\/p>\n
      y = float(y)<\/p>\n
      <\/code><\/pre>\n<\/p>\n
      \u5728\u8fd9\u4e9b\u4f8b\u5b50\u4e2d\uff0c\u53d8\u91cf x<\/code> \u548c y<\/code> \u6700\u521d\u5206\u522b\u662f\u6574\u6570\u548c\u5b57\u7b26\u4e32\uff0c\u7136\u540e\u901a\u8fc7 float()<\/code> \u51fd\u6570\u88ab\u8f6c\u6362\u4e3a\u6d6e\u70b9\u578b\u3002<\/p>\n<\/p>\n
      \u4f18\u70b9<\/h4>\n<\/p>\n
        \n
      • \u9002\u7528\u6027\u5e7f<\/strong>\uff1a\u9002\u7528\u4e8e\u591a\u79cd\u7c7b\u578b\u6570\u636e\u7684\u8f6c\u6362\u3002<\/li>\n
      • \u4fdd\u8bc1\u6570\u636e\u7c7b\u578b\u4e00\u81f4\u6027<\/strong>\uff1a\u5728\u9700\u8981\u786e\u4fdd\u53d8\u91cf\u4e3a\u6d6e\u70b9\u578b\u7684\u573a\u666f\u4e2d\u7279\u522b\u6709\u7528\u3002<\/li>\n<\/ul>\n
        \u56db\u3001\u79d1\u5b66\u8ba1\u6570\u6cd5<\/h3>\n<\/p>\n
        Python \u8fd8\u652f\u6301\u4f7f\u7528\u79d1\u5b66\u8ba1\u6570\u6cd5\u6765\u5b9a\u4e49\u6d6e\u70b9\u578b\u53d8\u91cf\u3002\u8fd9\u5bf9\u4e8e\u5904\u7406\u975e\u5e38\u5927\u6216\u975e\u5e38\u5c0f\u7684\u6570\u503c\u7279\u522b\u6709\u7528\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
        x = 1.23e4  # \u76f8\u5f53\u4e8e 1.23 * 10^4<\/p>\n
        y = 5.67e-8 # \u76f8\u5f53\u4e8e 5.67 * 10^-8<\/p>\n
        <\/code><\/pre>\n<\/p>\n
        \u5728\u8fd9\u4e9b\u4f8b\u5b50\u4e2d\uff0c\u53d8\u91cf x<\/code> \u548c y<\/code> \u88ab\u5b9a\u4e49\u4e3a\u6d6e\u70b9\u578b\u6570\u503c 12300.0<\/code> \u548c 0.0000000567<\/code>\u3002<\/p>\n<\/p>\n
        \u4f18\u70b9<\/h4>\n<\/p>\n
          \n
        • \u9002\u7528\u4e8e\u6781\u7aef\u6570\u503c<\/strong>\uff1a\u80fd\u65b9\u4fbf\u5730\u8868\u793a\u975e\u5e38\u5927\u6216\u975e\u5e38\u5c0f\u7684\u6570\u503c\u3002<\/li>\n
        • \u4ee3\u7801\u7b80\u6d01<\/strong>\uff1a\u79d1\u5b66\u8ba1\u6570\u6cd5\u80fd\u51cf\u5c11\u4ee3\u7801\u7684\u5197\u957f\u3002<\/li>\n<\/ul>\n
          \u4e94\u3001\u6ce8\u610f\u4e8b\u9879<\/h3>\n<\/p>\n
          \u5728\u4f7f\u7528\u6d6e\u70b9\u578b\u53d8\u91cf\u65f6\uff0c\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n<\/p>\n
          \u7cbe\u5ea6\u95ee\u9898<\/h4>\n<\/p>\n
          \u6d6e\u70b9\u578b\u6570\u503c\u5728\u8ba1\u7b97\u4e2d\u53ef\u80fd\u4f1a\u6709\u7cbe\u5ea6\u95ee\u9898\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
          x = 0.1 + 0.2<\/p>\n
          print(x)  # \u8f93\u51fa 0.30000000000000004<\/p>\n
          <\/code><\/pre>\n<\/p>\n
          \u8fd9\u662f\u56e0\u4e3a\u6d6e\u70b9\u6570\u5728\u8ba1\u7b97\u673a\u4e2d\u662f\u4ee5\u4e8c\u8fdb\u5236\u5f62\u5f0f\u5b58\u50a8\u7684\uff0c\u6709\u65f6\u65e0\u6cd5\u7cbe\u786e\u8868\u793a\u5341\u8fdb\u5236\u7684\u5c0f\u6570\u3002<\/p>\n<\/p>\n
          \u7c7b\u578b\u68c0\u67e5<\/h4>\n<\/p>\n
          \u6709\u65f6\u4f60\u53ef\u80fd\u9700\u8981\u68c0\u67e5\u4e00\u4e2a\u53d8\u91cf\u662f\u5426\u4e3a\u6d6e\u70b9\u578b\uff0c\u53ef\u4ee5\u4f7f\u7528 isinstance()<\/code> \u51fd\u6570\uff1a<\/p>\n<\/p>\n
          x = 3.14<\/p>\n
          print(isinstance(x, float))  # \u8f93\u51fa True<\/p>\n
          <\/code><\/pre>\n<\/p>\n
          \u8fd9\u79cd\u65b9\u6cd5\u80fd\u5e2e\u52a9\u4f60\u5728\u4ee3\u7801\u4e2d\u8fdb\u884c\u7c7b\u578b\u5b89\u5168\u68c0\u67e5\uff0c\u907f\u514d\u7c7b\u578b\u9519\u8bef\u3002<\/p>\n<\/p>\n
          \u516d\u3001\u5e94\u7528\u5b9e\u4f8b<\/h3>\n<\/p>\n
          \u4e3a\u4e86\u66f4\u597d\u5730\u7406\u89e3\u5982\u4f55\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\u4f7f\u7528\u6d6e\u70b9\u578b\u53d8\u91cf\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e94\u7528\u5b9e\u4f8b\uff1a<\/p>\n<\/p>\n
          \u8ba1\u7b97\u5706\u7684\u9762\u79ef<\/h4>\n<\/p>\n
          import math<\/p>\n
          radius = 5.0<\/p>\n
          area = math.pi * (radius  2)<\/p>\n
          print(f"\u5706\u7684\u9762\u79ef\u662f: {area}")<\/p>\n
          <\/code><\/pre>\n<\/p>\n
          \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cradius<\/code> \u88ab\u5b9a\u4e49\u4e3a\u6d6e\u70b9\u578b\u6570\u503c 5.0<\/code>\uff0c\u7136\u540e\u88ab\u7528\u6765\u8ba1\u7b97\u5706\u7684\u9762\u79ef\u3002<\/p>\n<\/p>\n
          \u8d27\u5e01\u8f6c\u6362<\/h4>\n<\/p>\n
          usd_to_eur_rate = 0.85<\/p>\n
          usd_amount = 150.0<\/p>\n
          eur_amount = usd_amount * usd_to_eur_rate<\/p>\n
          print(f"{usd_amount} \u7f8e\u5143\u76f8\u5f53\u4e8e {eur_amount} \u6b27\u5143")<\/p>\n
          <\/code><\/pre>\n<\/p>\n
          \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cusd_amount<\/code> \u548c usd_to_eur_rate<\/code> \u88ab\u5b9a\u4e49\u4e3a\u6d6e\u70b9\u578b\uff0c\u7528\u4e8e\u8ba1\u7b97\u7f8e\u5143\u5230\u6b27\u5143\u7684\u8f6c\u6362\u3002<\/p>\n<\/p>\n
          \u7ed3\u8bba<\/h3>\n<\/p>\n
          \u76f4\u63a5\u8d4b\u503c\u3001\u4f7f\u7528\u5185\u7f6e\u51fd\u6570\u3001\u4ece\u5176\u4ed6\u6570\u636e\u7c7b\u578b\u8f6c\u6362\u3001\u79d1\u5b66\u8ba1\u6570\u6cd5<\/strong> \u662f\u5728Python\u4e2d\u5b9a\u4e49\u6d6e\u70b9\u578b\u53d8\u91cf\u7684\u4e3b\u8981\u65b9\u6cd5\u3002\u6bcf\u79cd\u65b9\u6cd5\u90fd\u6709\u5176\u4f18\u70b9\u548c\u9002\u7528\u573a\u666f\uff0c\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u80fd\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u6548\u7387\u3002\u7279\u522b\u662f\u5728\u79d1\u5b66\u8ba1\u7b97\u3001\u91d1\u878d\u5206\u6790\u548c\u6570\u636e\u5904\u7406\u7b49\u9886\u57df\uff0c\u6b63\u786e\u4f7f\u7528\u6d6e\u70b9\u578b\u53d8\u91cf\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<\/p>\n
          \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
           \u5982\u4f55\u5728Python\u4e2d\u5b9a\u4e49\u6d6e\u70b9\u578b\u53d8\u91cf\uff1f<\/strong>
          \u5728Python\u4e2d\uff0c\u60a8\u53ef\u4ee5\u901a\u8fc7\u7b80\u5355\u7684\u8d4b\u503c\u6765\u5b9a\u4e49\u4e00\u4e2a\u6d6e\u70b9\u578b\u53d8\u91cf\u3002\u53ea\u9700\u5c06\u4e00\u4e2a\u5e26\u5c0f\u6570\u7684\u6570\u503c\u8d4b\u7ed9\u53d8\u91cf\u540d\uff0c\u4f8b\u5982\uff1amy_float = 3.14<\/code>\u3002\u8fd9\u6837\uff0cmy_float<\/code>\u5c31\u88ab\u5b9a\u4e49\u4e3a\u4e00\u4e2a\u6d6e\u70b9\u578b\u53d8\u91cf\u3002<\/p>\n
          \u6d6e\u70b9\u578b\u53d8\u91cf\u5728Python\u4e2d\u6709\u54ea\u4e9b\u5e38\u89c1\u5e94\u7528\uff1f<\/strong>
          \u6d6e\u70b9\u578b\u53d8\u91cf\u5e7f\u6cdb\u7528\u4e8e\u9700\u8981\u7cbe\u786e\u8868\u793a\u5c0f\u6570\u7684\u573a\u666f\uff0c\u4f8b\u5982\u91d1\u878d\u8ba1\u7b97\u3001\u79d1\u5b66\u5b9e\u9a8c\u6570\u636e\u4ee5\u53ca\u4efb\u4f55\u9700\u8981\u8fdb\u884c\u5c0f\u6570\u8fd0\u7b97\u7684\u7a0b\u5e8f\u4e2d\u3002\u5b83\u4eec\u53ef\u4ee5\u5e2e\u52a9\u60a8\u5904\u7406\u975e\u6574\u6570\u503c\uff0c\u4ece\u800c\u4f7f\u5f97\u8ba1\u7b97\u66f4\u52a0\u7075\u6d3b\u548c\u7cbe\u786e\u3002<\/p>\n
          \u5982\u4f55\u68c0\u67e5\u4e00\u4e2a\u53d8\u91cf\u7684\u7c7b\u578b\u662f\u5426\u4e3a\u6d6e\u70b9\u578b\uff1f<\/strong>
          \u4f7f\u7528\u5185\u7f6e\u7684type()<\/code>\u51fd\u6570\u53ef\u4ee5\u8f7b\u677e\u68c0\u67e5\u53d8\u91cf\u7684\u7c7b\u578b\u3002\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528type(my_float) == float<\/code>\u6765\u5224\u65ad\u53d8\u91cfmy_float<\/code>\u662f\u5426\u4e3a\u6d6e\u70b9\u578b\u3002\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u786e\u4fdd\u60a8\u5728\u8fdb\u884c\u6570\u5b66\u8fd0\u7b97\u65f6\u4f7f\u7528\u7684\u662f\u6b63\u786e\u7684\u6570\u636e\u7c7b\u578b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0c\u5b9a\u4e49\u4e00\u4e2a\u53d8\u91cf\u4e3a\u6d6e\u70b9\u578b\u7684\u65b9\u6cd5\u6709\u51e0\u79cd\uff1a\u76f4\u63a5\u8d4b\u503c\u3001\u4f7f\u7528\u5185\u7f6e\u51fd\u6570\u3001\u4ece\u5176\u4ed6\u6570\u636e\u7c7b\u578b\u8f6c\u6362\u3002 \u5176\u4e2d\uff0c\u76f4\u63a5\u8d4b […]","protected":false},"author":3,"featured_media":1127315,"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\/1127307"}],"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=1127307"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1127307\/revisions"}],"predecessor-version":[{"id":1127318,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1127307\/revisions\/1127318"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1127315"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1127307"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1127307"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1127307"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}