{"id":991042,"date":"2024-12-27T08:25:20","date_gmt":"2024-12-27T00:25:20","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/991042.html"},"modified":"2024-12-27T08:25:22","modified_gmt":"2024-12-27T00:25:22","slug":"python%e5%a6%82%e4%bd%95%e6%8e%a7%e5%88%b6%e6%b5%ae%e7%82%b9%e4%bd%8d%e6%95%b0","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/991042.html","title":{"rendered":"python\u5982\u4f55\u63a7\u5236\u6d6e\u70b9\u4f4d\u6570"},"content":{"rendered":"

\"python\u5982\u4f55\u63a7\u5236\u6d6e\u70b9\u4f4d\u6570\"<\/p>\n

\u5728Python\u4e2d\uff0c\u63a7\u5236\u6d6e\u70b9\u6570\u7684\u5c0f\u6570\u4f4d\u6570\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u6cd5\u5b9e\u73b0\uff0c\u4e3b\u8981\u5305\u62ec\uff1a\u4f7f\u7528\u5185\u7f6e\u7684round()<\/code>\u51fd\u6570\u3001\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u65b9\u6cd5\u3001\u4ee5\u53cadecimal<\/code>\u6a21\u5757\u3002<\/strong> \u901a\u8fc7round()<\/code>\u51fd\u6570\uff0c\u4f60\u53ef\u4ee5\u5feb\u901f\u5730\u5bf9\u6570\u5b57\u8fdb\u884c\u56db\u820d\u4e94\u5165\u3002\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u65b9\u6cd5\u63d0\u4f9b\u4e86\u66f4\u7075\u6d3b\u7684\u683c\u5f0f\u5b9a\u4e49\u65b9\u5f0f\uff0c\u800cdecimal<\/code>\u6a21\u5757\u5219\u9002\u5408\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u8ba1\u7b97\u573a\u666f\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u65b9\u6cd5\u7684\u4f7f\u7528\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528ROUND()\u51fd\u6570<\/p>\n<\/p>\n

round()<\/code>\u51fd\u6570\u662fPython\u5185\u7f6e\u7684\u51fd\u6570\u4e4b\u4e00\uff0c\u80fd\u591f\u5bf9\u6d6e\u70b9\u6570\u8fdb\u884c\u56db\u820d\u4e94\u5165\u5904\u7406\u3002\u5b83\u7684\u57fa\u672c\u7528\u6cd5\u662fround(number, ndigits)<\/code>\uff0c\u5176\u4e2dnumber<\/code>\u662f\u9700\u8981\u5904\u7406\u7684\u6570\u5b57\uff0cndigits<\/code>\u662f\u5e0c\u671b\u4fdd\u7559\u7684\u5c0f\u6570\u4f4d\u6570\u3002<\/p>\n<\/p>\n

    \n
  1. \n

    \u57fa\u672c\u7528\u6cd5<\/strong><\/p>\n<\/p>\n

    \u4f7f\u7528round()<\/code>\u51fd\u6570\u53ef\u4ee5\u5feb\u901f\u5730\u5bf9\u6d6e\u70b9\u6570\u8fdb\u884c\u56db\u820d\u4e94\u5165\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8e\u4e00\u4e2a\u6d6e\u70b9\u65703.1415926<\/code>\uff0c\u6211\u4eec\u5e0c\u671b\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570\uff0c\u53ef\u4ee5\u8fd9\u6837\u505a\uff1a<\/p>\n<\/p>\n

    rounded_value = round(3.1415926, 2)<\/p>\n
    print(rounded_value)  # \u8f93\u51fa\uff1a3.14<\/p>\n
    <\/code><\/pre>\n<\/p>\n<\/li>\n
  2. \n
    \u6ce8\u610f\u4e8b\u9879<\/strong><\/p>\n<\/p>\n
    \u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cround()<\/code>\u51fd\u6570\u5728\u5904\u7406\u6d6e\u70b9\u6570\u65f6\uff0c\u53ef\u80fd\u4f1a\u56e0\u4e3a\u6d6e\u70b9\u6570\u672c\u8eab\u7684\u5b58\u50a8\u65b9\u5f0f\u5bfc\u81f4\u820d\u5165\u7ed3\u679c\u4e0d\u5982\u9884\u671f\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
    print(round(2.675, 2))  # \u8f93\u51fa\uff1a2.67\uff0c\u800c\u4e0d\u662f2.68<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    \u8fd9\u79cd\u60c5\u51b5\u662f\u7531\u4e8e\u6d6e\u70b9\u6570\u5728\u8ba1\u7b97\u673a\u4e2d\u5b58\u50a8\u7684\u4e8c\u8fdb\u5236\u8868\u793a\u6240\u5bfc\u81f4\u7684\u7cbe\u5ea6\u95ee\u9898\u3002<\/p>\n<\/p>\n<\/li>\n<\/ol>\n
    \u4e8c\u3001\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u65b9\u6cd5<\/p>\n<\/p>\n
    \u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u65b9\u6cd5\u63d0\u4f9b\u4e86\u66f4\u7075\u6d3b\u7684\u683c\u5f0f\u63a7\u5236\u65b9\u5f0f\uff0c\u53ef\u4ee5\u5728\u8f93\u51fa\u65f6\u6307\u5b9a\u5c0f\u6570\u4f4d\u6570\u3002\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u5bf9\u8f93\u51fa\u683c\u5f0f\u6709\u7279\u5b9a\u8981\u6c42\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
      \n
    1. \n
      \u4f7f\u7528f-string<\/strong><\/p>\n<\/p>\n
      \u4ecePython 3.6\u5f00\u59cb\uff0cf-string\u63d0\u4f9b\u4e86\u4e00\u79cd\u7b80\u5355\u800c\u5f3a\u5927\u7684\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u65b9\u6cd5\u3002\u901a\u8fc7\u5728\u5927\u62ec\u53f7\u4e2d\u4f7f\u7528\u683c\u5f0f\u8bf4\u660e\u7b26\uff0c\u53ef\u4ee5\u6307\u5b9a\u6d6e\u70b9\u6570\u7684\u5c0f\u6570\u4f4d\u6570\uff1a<\/p>\n<\/p>\n
      value = 3.1415926<\/p>\n
      formatted_value = f"{value:.2f}"<\/p>\n
      print(formatted_value)  # \u8f93\u51fa\uff1a3.14<\/p>\n
      <\/code><\/pre>\n<\/p>\n<\/li>\n
    2. \n
      \u4f7f\u7528format()\u65b9\u6cd5<\/strong><\/p>\n<\/p>\n
      format()<\/code>\u65b9\u6cd5\u662f\u53e6\u4e00\u79cd\u7075\u6d3b\u7684\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u65b9\u5f0f\uff0c\u53ef\u4ee5\u901a\u8fc7\u6307\u5b9a\u683c\u5f0f\u8bf4\u660e\u7b26\u63a7\u5236\u5c0f\u6570\u4f4d\u6570\uff1a<\/p>\n<\/p>\n
      value = 3.1415926<\/p>\n
      formatted_value = "{:.2f}".format(value)<\/p>\n
      print(formatted_value)  # \u8f93\u51fa\uff1a3.14<\/p>\n
      <\/code><\/pre>\n<\/p>\n
      \u8fd9\u79cd\u65b9\u6cd5\u4e0ef-string\u76f8\u4f3c\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u53ef\u80fd\u66f4\u9002\u5408\u9700\u8981\u52a8\u6001\u6784\u5efa\u683c\u5f0f\u5b57\u7b26\u4e32\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n<\/li>\n<\/ol>\n
      \u4e09\u3001\u4f7f\u7528DECIMAL\u6a21\u5757<\/p>\n<\/p>\n
      \u5bf9\u4e8e\u9700\u8981\u9ad8\u7cbe\u5ea6\u8ba1\u7b97\u7684\u573a\u666f\uff0cPython\u63d0\u4f9b\u4e86decimal<\/code>\u6a21\u5757\uff0c\u8be5\u6a21\u5757\u5141\u8bb8\u7528\u6237\u6307\u5b9a\u7cbe\u5ea6\u5e76\u8fdb\u884c\u7cbe\u786e\u7684\u6d6e\u70b9\u8fd0\u7b97\u3002<\/p>\n<\/p>\n
        \n
      1. \n
        \u521b\u5efaDecimal\u5bf9\u8c61<\/strong><\/p>\n<\/p>\n
        decimal<\/code>\u6a21\u5757\u7684\u6838\u5fc3\u662fDecimal<\/code>\u5bf9\u8c61\uff0c\u5b83\u53ef\u4ee5\u901a\u8fc7\u4f20\u5165\u5b57\u7b26\u4e32\u6216\u6570\u5b57\u6765\u521b\u5efa\uff1a<\/p>\n<\/p>\n
        from decimal import Decimal<\/p>\n
        value = Decimal('3.1415926')<\/p>\n
        <\/code><\/pre>\n<\/p>\n<\/li>\n
      2. \n
        \u8bbe\u7f6e\u7cbe\u5ea6<\/strong><\/p>\n<\/p>\n
        \u53ef\u4ee5\u901a\u8fc7decimal<\/code>\u6a21\u5757\u4e2d\u7684getcontext()<\/code>\u51fd\u6570\u6765\u8bbe\u7f6e\u5168\u5c40\u7684\u7cbe\u5ea6\uff1a<\/p>\n<\/p>\n
        from decimal import getcontext<\/p>\n
        getcontext().prec = 4  # \u8bbe\u7f6e\u5168\u5c40\u7cbe\u5ea6\u4e3a4\u4f4d<\/p>\n
        result = Decimal('3.1415926') + Decimal('2.7182818')<\/p>\n
        print(result)  # \u8f93\u51fa\uff1a5.860<\/p>\n
        <\/code><\/pre>\n<\/p>\n
        decimal<\/code>\u6a21\u5757\u63d0\u4f9b\u4e86\u6bd4\u5185\u7f6e\u6d6e\u70b9\u7c7b\u578b\u66f4\u9ad8\u7684\u7cbe\u5ea6\u548c\u66f4\u7a33\u5b9a\u7684\u7ed3\u679c\uff0c\u4f46\u76f8\u5bf9\u8ba1\u7b97\u901f\u5ea6\u8f83\u6162\u3002<\/p>\n<\/p>\n<\/li>\n<\/ol>\n
        \u56db\u3001\u7ed3\u5408\u5b9e\u9645\u573a\u666f\u9009\u62e9\u65b9\u6cd5<\/p>\n<\/p>\n
        \u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u9009\u62e9\u63a7\u5236\u6d6e\u70b9\u6570\u5c0f\u6570\u4f4d\u6570\u7684\u65b9\u6cd5\u5e94\u6839\u636e\u5177\u4f53\u9700\u6c42\u6765\u5b9a\uff1a<\/p>\n<\/p>\n
          \n
        1. \n
          \u6027\u80fd\u4f18\u5148<\/strong><\/p>\n<\/p>\n
          \u5982\u679c\u5e94\u7528\u5bf9\u6027\u80fd\u8981\u6c42\u8f83\u9ad8\u4e14\u4e0d\u9700\u8981\u6781\u9ad8\u7684\u7cbe\u5ea6\uff0c\u4f7f\u7528\u5185\u7f6e\u7684round()<\/code>\u51fd\u6570\u6216\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u65b9\u6cd5\u901a\u5e38\u662f\u6700\u4f73\u9009\u62e9\u3002\u8fd9\u4e9b\u65b9\u6cd5\u7b80\u5355\u6613\u7528\uff0c\u4e14\u8ba1\u7b97\u901f\u5ea6\u8f83\u5feb\u3002<\/p>\n<\/p>\n<\/li>\n
        2. \n
          \u7cbe\u5ea6\u4f18\u5148<\/strong><\/p>\n<\/p>\n
          \u5f53\u5e94\u7528\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u8ba1\u7b97\u7ed3\u679c\u65f6\uff0c\u5e94\u9009\u62e9decimal<\/code>\u6a21\u5757\u3002\u5c3d\u7ba1\u8ba1\u7b97\u901f\u5ea6\u8f83\u6162\uff0c\u4f46\u5b83\u80fd\u63d0\u4f9b\u7a33\u5b9a\u4e14\u7cbe\u786e\u7684\u7ed3\u679c\uff0c\u9002\u5408\u91d1\u878d\u8ba1\u7b97\u7b49\u573a\u666f\u3002<\/p>\n<\/p>\n<\/li>\n
        3. \n
          \u8f93\u51fa\u683c\u5f0f\u8981\u6c42<\/strong><\/p>\n<\/p>\n
          \u5f53\u9700\u8981\u5bf9\u8f93\u51fa\u683c\u5f0f\u8fdb\u884c\u4e25\u683c\u63a7\u5236\u65f6\uff0c\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u65b9\u6cd5\uff08\u5305\u62ecf-string\u548cformat()<\/code>\u65b9\u6cd5\uff09\u662f\u7406\u60f3\u7684\u9009\u62e9\u3002\u5b83\u4eec\u63d0\u4f9b\u4e86\u7075\u6d3b\u7684\u683c\u5f0f\u63a7\u5236\u80fd\u529b\uff0c\u80fd\u591f\u6ee1\u8db3\u591a\u79cd\u8f93\u51fa\u9700\u6c42\u3002<\/p>\n<\/p>\n<\/li>\n<\/ol>\n
          \u4e94\u3001\u603b\u7ed3<\/p>\n<\/p>\n
          \u5728Python\u4e2d\u63a7\u5236\u6d6e\u70b9\u6570\u7684\u5c0f\u6570\u4f4d\u6570\u6709\u591a\u79cd\u65b9\u6cd5\u53ef\u4f9b\u9009\u62e9\u3002\u6839\u636e\u4e0d\u540c\u7684\u5e94\u7528\u573a\u666f\u548c\u9700\u6c42\uff0c\u53ef\u4ee5\u9009\u62e9\u4f7f\u7528round()<\/code>\u51fd\u6570\u3001\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u65b9\u6cd5\u6216decimal<\/code>\u6a21\u5757\u3002\u65e0\u8bba\u9009\u62e9\u54ea\u79cd\u65b9\u6cd5\uff0c\u7406\u89e3\u5176\u4f18\u7f3a\u70b9\u4ee5\u53ca\u9002\u7528\u573a\u666f\u90fd\u662f\u786e\u4fdd\u5e94\u7528\u7a0b\u5e8f\u51c6\u786e\u6027\u548c\u6548\u7387\u7684\u5173\u952e\u3002<\/strong><\/p>\n<\/p>\n
          \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
           \u5982\u4f55\u5728Python\u4e2d\u8bbe\u7f6e\u6d6e\u70b9\u6570\u7684\u663e\u793a\u7cbe\u5ea6\uff1f<\/strong>
          \u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u5185\u7f6e\u7684round()<\/code>\u51fd\u6570\u6765\u63a7\u5236\u6d6e\u70b9\u6570\u7684\u663e\u793a\u7cbe\u5ea6\u3002\u4f8b\u5982\uff0cround(3.14159, 2)<\/code>\u4f1a\u8fd4\u56de3.14<\/code>\u3002\u6b64\u5916\uff0c\u4f7f\u7528\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u4e5f\u53ef\u4ee5\u5b9e\u73b0\u66f4\u7075\u6d3b\u7684\u63a7\u5236\uff0c\u4f8b\u5982"{:.2f}".format(3.14159)<\/code>\u6216\u8005\u4f7f\u7528f-string f"{3.14159:.2f}"<\/code>\uff0c\u8fd9\u4e9b\u65b9\u6cd5\u90fd\u80fd\u65b9\u4fbf\u5730\u9650\u5236\u5c0f\u6570\u70b9\u540e\u4f4d\u6570\u3002<\/p>\n
          \u5728Python\u4e2d\u8fdb\u884c\u6d6e\u70b9\u6570\u8ba1\u7b97\u65f6\uff0c\u5982\u4f55\u907f\u514d\u7cbe\u5ea6\u95ee\u9898\uff1f<\/strong>
          \u6d6e\u70b9\u6570\u5728\u8ba1\u7b97\u65f6\u53ef\u80fd\u4f1a\u51fa\u73b0\u7cbe\u5ea6\u95ee\u9898\uff0c\u5c24\u5176\u662f\u5728\u8fdb\u884c\u591a\u4e2a\u6d6e\u70b9\u6570\u8fd0\u7b97\u65f6\u3002\u4e3a\u4e86\u51cf\u5c11\u8fd9\u79cd\u8bef\u5dee\uff0c\u53ef\u4ee5\u4f7f\u7528decimal<\/code>\u6a21\u5757\u6765\u8fdb\u884c\u9ad8\u7cbe\u5ea6\u8ba1\u7b97\u3002\u901a\u8fc7from decimal import Decimal<\/code>\u5f15\u5165\u540e\uff0c\u53ef\u4ee5\u521b\u5efaDecimal<\/code>\u5bf9\u8c61\uff0c\u8fd9\u6837\u8ba1\u7b97\u7ed3\u679c\u4f1a\u66f4\u4e3a\u7cbe\u786e\u3002\u4f8b\u5982\uff0cDecimal('0.1') + Decimal('0.2')<\/code>\u5c06\u51c6\u786e\u8fd4\u56deDecimal('0.3')<\/code>\u3002<\/p>\n
          Python\u4e2d\u5982\u4f55\u5c06\u6d6e\u70b9\u6570\u8f6c\u6362\u4e3a\u6574\u6570\uff1f<\/strong>
          \u5982\u679c\u9700\u8981\u5c06\u6d6e\u70b9\u6570\u8f6c\u6362\u4e3a\u6574\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528int()<\/code>\u51fd\u6570\u3002\u8fd9\u5c06\u76f4\u63a5\u53bb\u6389\u5c0f\u6570\u90e8\u5206\u800c\u4e0d\u8fdb\u884c\u56db\u820d\u4e94\u5165\u3002\u4f8b\u5982\uff0cint(3.7)<\/code>\u4f1a\u8fd4\u56de3<\/code>\u3002\u5982\u679c\u9700\u8981\u56db\u820d\u4e94\u5165\uff0c\u53ef\u4ee5\u7ed3\u5408round()<\/code>\u51fd\u6570\u4f7f\u7528\uff0c\u5982int(round(3.7))<\/code>\uff0c\u8fd9\u5c06\u8fd4\u56de4<\/code>\u3002\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u53ef\u6839\u636e\u5177\u4f53\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0c\u63a7\u5236\u6d6e\u70b9\u6570\u7684\u5c0f\u6570\u4f4d\u6570\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u6cd5\u5b9e\u73b0\uff0c\u4e3b\u8981\u5305\u62ec\uff1a\u4f7f\u7528\u5185\u7f6e\u7684round()\u51fd\u6570\u3001\u683c\u5f0f\u5316\u5b57\u7b26 […]","protected":false},"author":3,"featured_media":991051,"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\/991042"}],"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=991042"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/991042\/revisions"}],"predecessor-version":[{"id":991052,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/991042\/revisions\/991052"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/991051"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=991042"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=991042"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=991042"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}