{"id":1114065,"date":"2025-01-08T17:53:40","date_gmt":"2025-01-08T09:53:40","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1114065.html"},"modified":"2025-01-08T17:53:43","modified_gmt":"2025-01-08T09:53:43","slug":"python%e5%a6%82%e4%bd%95%e4%bf%9d%e7%95%99%e4%b8%89%e4%bd%8d%e6%95%b0%e5%ad%97","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1114065.html","title":{"rendered":"python\u5982\u4f55\u4fdd\u7559\u4e09\u4f4d\u6570\u5b57"},"content":{"rendered":"

\"python\u5982\u4f55\u4fdd\u7559\u4e09\u4f4d\u6570\u5b57\"<\/p>\n

\u4f7f\u7528Python\u4fdd\u7559\u4e09\u4f4d\u5c0f\u6570\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u5305\u62ec\u4f7f\u7528\u5185\u7f6e\u51fd\u6570round()\u3001\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u3001Decimal\u6a21\u5757\u7b49\u3002<\/strong> \u6211\u4eec\u53ef\u4ee5\u901a\u8fc7round()\u51fd\u6570<\/strong>\u6765\u5feb\u901f\u5b9e\u73b0\u8fd9\u4e00\u70b9\uff0c\u4f8b\u5982\uff1around(\u6570\u5b57, 3)<\/code>\uff0c\u8fd9\u79cd\u65b9\u6cd5\u7b80\u5355\u4e14\u9ad8\u6548\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u8ba8\u8bba\u8fd9\u4e9b\u65b9\u6cd5\u53ca\u5176\u9002\u7528\u573a\u666f\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528round()\u51fd\u6570<\/p>\n<\/p>\n

Python\u7684\u5185\u7f6e\u51fd\u6570round()<\/code>\u53ef\u4ee5\u8f7b\u677e\u5730\u5c06\u6570\u5b57\u56db\u820d\u4e94\u5165\u5230\u6307\u5b9a\u7684\u5c0f\u6570\u4f4d\u3002\u8fd9\u4e2a\u51fd\u6570\u7684\u8bed\u6cd5\u662fround(number, ndigits)<\/code>\uff0c\u5176\u4e2dnumber<\/code>\u662f\u8981\u5904\u7406\u7684\u6570\u5b57\uff0cndigits<\/code>\u662f\u8981\u4fdd\u7559\u7684\u5c0f\u6570\u4f4d\u6570\u3002<\/p>\n<\/p>\n

number = 3.1415926<\/p>\n
result = round(number, 3)<\/p>\n
print(result)  # \u8f93\u51fa: 3.142<\/p>\n
<\/code><\/pre>\n<\/p>\n
round()<\/code>\u51fd\u6570\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u8868\u73b0\u826f\u597d\uff0c\u4f46\u9700\u8981\u6ce8\u610f\u7684\u662f\u5b83\u4f7f\u7528\u7684\u662f\u56db\u820d\u4e94\u5165\u6cd5\uff0c\u8fd9\u5728\u67d0\u4e9b\u79d1\u5b66\u8ba1\u7b97\u6216\u8d22\u52a1\u8ba1\u7b97\u4e2d\u53ef\u80fd\u4e0d\u591f\u7cbe\u786e\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528\u683c\u5f0f\u5316\u5b57\u7b26\u4e32<\/p>\n<\/p>\n
Python\u7684\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u65b9\u6cd5\u4e5f\u53ef\u4ee5\u7528\u6765\u4fdd\u7559\u6307\u5b9a\u7684\u5c0f\u6570\u4f4d\u6570\u3002\u53ef\u4ee5\u4f7f\u7528\u65e7\u5f0f\u7684\u683c\u5f0f\u5316\u65b9\u6cd5\uff08%\uff09\u6216\u65b0\u5f0f\u7684\u683c\u5f0f\u5316\u65b9\u6cd5\uff08str.format()\uff09\u4ee5\u53caPython 3.6\u5f15\u5165\u7684f-string\u3002<\/p>\n<\/p>\n
    \n
  1. \u65e7\u5f0f\u683c\u5f0f\u5316\u65b9\u6cd5\uff08%\uff09<\/li>\n<\/ol>\n
    number = 3.1415926<\/p>\n
    result = '%.3f' % number<\/p>\n
    print(result)  # \u8f93\u51fa: 3.142<\/p>\n
    <\/code><\/pre>\n<\/p>\n
      \n
    1. \u65b0\u5f0f\u683c\u5f0f\u5316\u65b9\u6cd5\uff08str.format()\uff09<\/li>\n<\/ol>\n
      number = 3.1415926<\/p>\n
      result = '{:.3f}'.format(number)<\/p>\n
      print(result)  # \u8f93\u51fa: 3.142<\/p>\n
      <\/code><\/pre>\n<\/p>\n
        \n
      1. f-string\uff08Python 3.6+\uff09<\/li>\n<\/ol>\n
        number = 3.1415926<\/p>\n
        result = f'{number:.3f}'<\/p>\n
        print(result)  # \u8f93\u51fa: 3.142<\/p>\n
        <\/code><\/pre>\n<\/p>\n
        \u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u65b9\u6cd5\u4e0d\u4ec5\u6613\u4e8e\u4f7f\u7528\uff0c\u800c\u4e14\u5728\u5904\u7406\u5b57\u7b26\u4e32\u65f6\u5177\u6709\u66f4\u9ad8\u7684\u7075\u6d3b\u6027\u3002<\/strong><\/p>\n<\/p>\n
        \u4e09\u3001\u4f7f\u7528Decimal\u6a21\u5757<\/p>\n<\/p>\n
        \u5bf9\u4e8e\u9700\u8981\u66f4\u9ad8\u7cbe\u5ea6\u7684\u8ba1\u7b97\uff0c\u53ef\u4ee5\u4f7f\u7528Python\u7684decimal<\/code>\u6a21\u5757\u3002\u8fd9\u4e2a\u6a21\u5757\u63d0\u4f9b\u4e86\u4e00\u4e2aDecimal<\/code>\u6570\u636e\u7c7b\u578b\uff0c\u7528\u4e8e\u5341\u8fdb\u5236\u6d6e\u70b9\u8fd0\u7b97\u3002\u4f7f\u7528\u8fd9\u4e2a\u6a21\u5757\u53ef\u4ee5\u907f\u514d\u6d6e\u70b9\u6570\u8ba1\u7b97\u4e2d\u7684\u820d\u5165\u8bef\u5dee\u3002<\/p>\n<\/p>\n
        from decimal import Decimal, ROUND_HALF_UP<\/p>\n
        number = Decimal('3.1415926')<\/p>\n
        result = number.quantize(Decimal('0.001'), rounding=ROUND_HALF_UP)<\/p>\n
        print(result)  # \u8f93\u51fa: 3.142<\/p>\n
        <\/code><\/pre>\n<\/p>\n
        Decimal<\/code>\u6a21\u5757\u5141\u8bb8\u7528\u6237\u6307\u5b9a\u820d\u5165\u65b9\u5f0f\uff0c\u9ed8\u8ba4\u7684ROUND_HALF_UP<\/code>\u5b9e\u73b0\u4e86\u56db\u820d\u4e94\u5165\u3002<\/p>\n<\/p>\n
        \u56db\u3001\u4f7f\u7528Numpy\u5e93<\/p>\n<\/p>\n
        \u5982\u679c\u4f60\u5728\u5904\u7406\u5927\u91cf\u6570\u636e\uff0c\u5c24\u5176\u662f\u5728\u79d1\u5b66\u8ba1\u7b97\u6216\u6570\u636e\u5206\u6790\u4e2d\uff0cnumpy<\/code>\u5e93\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u9009\u62e9\u3002Numpy\u5e93\u63d0\u4f9b\u4e86\u5bf9\u6570\u7ec4\u8fdb\u884c\u5143\u7d20\u7ea7\u64cd\u4f5c\u7684\u529f\u80fd\uff0c\u5305\u62ec\u4fdd\u7559\u6307\u5b9a\u7684\u5c0f\u6570\u4f4d\u6570\u3002<\/p>\n<\/p>\n
        import numpy as np<\/p>\n
        number = np.array([3.1415926])<\/p>\n
        result = np.round(number, 3)<\/p>\n
        print(result)  # \u8f93\u51fa: [3.142]<\/p>\n
        <\/code><\/pre>\n<\/p>\n
        Numpy\u7684round<\/code>\u51fd\u6570\u548cPython\u5185\u7f6e\u7684round<\/code>\u51fd\u6570\u7c7b\u4f3c\uff0c\u4f46\u5b83\u53ef\u4ee5\u76f4\u63a5\u4f5c\u7528\u4e8e\u6570\u7ec4\uff0c\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\u66f4\u52a0\u9ad8\u6548\u3002<\/p>\n<\/p>\n
        \u4e94\u3001\u4f7f\u7528Pandas\u5e93<\/p>\n<\/p>\n
        \u5728\u6570\u636e\u5206\u6790\u4e2d\uff0cpandas<\/code>\u5e93\u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u6570\u636e\u5904\u7406\u80fd\u529b\u3002\u53ef\u4ee5\u4f7f\u7528pandas<\/code>\u7684apply<\/code>\u65b9\u6cd5\u5bf9\u6570\u636e\u6846\u4e2d\u7684\u5143\u7d20\u8fdb\u884c\u9010\u4e2a\u5904\u7406\uff0c\u4fdd\u7559\u6307\u5b9a\u7684\u5c0f\u6570\u4f4d\u6570\u3002<\/p>\n<\/p>\n
        import pandas as pd<\/p>\n
        data = {'number': [3.1415926, 2.7182818, 1.6180339]}<\/p>\n
        df = pd.DataFrame(data)<\/p>\n
        df['rounded'] = df['number'].apply(lambda x: round(x, 3))<\/p>\n
        print(df)<\/p>\n
        <\/code><\/pre>\n<\/p>\n
        \u516d\u3001\u6bd4\u8f83\u548c\u9009\u62e9<\/p>\n<\/p>\n
        \u5728\u9009\u62e9\u4fdd\u7559\u5c0f\u6570\u4f4d\u6570\u7684\u65b9\u6cd5\u65f6\uff0c\u5e94\u8be5\u8003\u8651\u5230\u5177\u4f53\u7684\u5e94\u7528\u573a\u666f\uff1a<\/p>\n<\/p>\n
          \n
        1. \u7b80\u5355\u5e94\u7528<\/strong>\uff1a\u5982\u679c\u53ea\u662f\u7b80\u5355\u7684\u56db\u820d\u4e94\u5165\uff0c\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528round()<\/code>\u51fd\u6570\u3002<\/li>\n
        2. \u5b57\u7b26\u4e32\u5904\u7406<\/strong>\uff1a\u5982\u679c\u9700\u8981\u5c06\u7ed3\u679c\u5d4c\u5165\u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u4f7f\u7528\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u7684\u65b9\u6cd5\u3002<\/li>\n
        3. \u9ad8\u7cbe\u5ea6\u8ba1\u7b97<\/strong>\uff1a\u5728\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u573a\u666f\uff0c\u5982\u79d1\u5b66\u8ba1\u7b97\u6216\u8d22\u52a1\u8ba1\u7b97\uff0c\u63a8\u8350\u4f7f\u7528Decimal<\/code>\u6a21\u5757\u3002<\/li>\n
        4. \u5927\u89c4\u6a21\u6570\u636e\u5904\u7406<\/strong>\uff1a\u5728\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\u65f6\uff0cnumpy<\/code>\u548cpandas<\/code>\u5e93\u63d0\u4f9b\u4e86\u66f4\u9ad8\u6548\u7684\u89e3\u51b3\u65b9\u6848\u3002<\/li>\n<\/ol>\n
          \u6bcf\u79cd\u65b9\u6cd5\u90fd\u6709\u5176\u9002\u7528\u7684\u573a\u666f\u548c\u4f18\u7f3a\u70b9\uff0c\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u6548\u7387\u548c\u51c6\u786e\u6027\u3002<\/p>\n<\/p>\n
          \u603b\u7ed3<\/p>\n<\/p>\n
          Python\u63d0\u4f9b\u4e86\u591a\u79cd\u65b9\u6cd5\u6765\u4fdd\u7559\u6307\u5b9a\u7684\u5c0f\u6570\u4f4d\u6570\uff0c\u5305\u62ec\u5185\u7f6e\u51fd\u6570round()<\/code>\u3001\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u3001Decimal<\/code>\u6a21\u5757\u3001numpy<\/code>\u5e93\u548cpandas<\/code>\u5e93\u3002\u6839\u636e\u4e0d\u540c\u7684\u5e94\u7528\u573a\u666f\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u786e\u4fdd\u8ba1\u7b97\u7684\u51c6\u786e\u6027\u548c\u6548\u7387\u3002\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0cround()<\/code>\u51fd\u6570\u548c\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u65b9\u6cd5\u8db3\u4ee5\u6ee1\u8db3\u9700\u6c42\uff0c\u4f46\u5728\u9ad8\u7cbe\u5ea6\u8ba1\u7b97\u6216\u5927\u6570\u636e\u5904\u7406\u573a\u666f\u4e0b\uff0cDecimal<\/code>\u6a21\u5757\u548cnumpy<\/code>\u3001pandas<\/code>\u5e93\u5219\u662f\u66f4\u597d\u7684\u9009\u62e9\u3002<\/p>\n<\/p>\n
          \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
           \u5982\u4f55\u5728Python\u4e2d\u5c06\u6d6e\u70b9\u6570\u683c\u5f0f\u5316\u4e3a\u4e09\u4f4d\u5c0f\u6570\uff1f<\/strong>
          \u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u5185\u7f6e\u7684\u683c\u5f0f\u5316\u51fd\u6570\u6765\u5c06\u6d6e\u70b9\u6570\u4fdd\u7559\u4e09\u4f4d\u5c0f\u6570\u3002\u53ef\u4ee5\u4f7f\u7528format()<\/code>\u51fd\u6570\u6216f-string\uff08\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\uff09\u6765\u5b9e\u73b0\u3002\u4f8b\u5982\uff1a  <\/p>\n
          number = 3.14159265\nformatted_number = format(number, '.3f')\n# \u6216\u8005\u4f7f\u7528f-string\nformatted_number = f"{number:.3f}"\nprint(formatted_number)  # \u8f93\u51fa 3.142\n<\/code><\/pre>\n
          \u8fd9\u4e24\u79cd\u65b9\u6cd5\u90fd\u80fd\u6709\u6548\u4fdd\u7559\u4e09\u4f4d\u5c0f\u6570\uff0c\u4e14\u8f93\u51fa\u4e3a\u5b57\u7b26\u4e32\u683c\u5f0f\u3002<\/p>\n
          Python\u4e2d\u5982\u4f55\u5bf9\u6570\u5b57\u8fdb\u884c\u56db\u820d\u4e94\u5165\u5230\u4e09\u4f4d\u5c0f\u6570\uff1f<\/strong>
          \u5728Python\u4e2d\uff0c\u4f7f\u7528round()<\/code>\u51fd\u6570\u53ef\u4ee5\u5b9e\u73b0\u6570\u5b57\u7684\u56db\u820d\u4e94\u5165\u3002\u4f8b\u5982\uff1a  <\/p>\n
          number = 2.6789\nrounded_number = round(number, 3)\nprint(rounded_number)  # \u8f93\u51fa 2.679\n<\/code><\/pre>\n
          \u8be5\u51fd\u6570\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u6307\u5b9a\u4fdd\u7559\u7684\u5c0f\u6570\u4f4d\u6570\uff0c\u8fd4\u56de\u7684\u7ed3\u679c\u5c06\u662f\u6d6e\u70b9\u6570\uff0c\u5df2\u7ecf\u56db\u820d\u4e94\u5165\u5230\u6307\u5b9a\u7684\u4f4d\u6570\u3002<\/p>\n
          \u5728Python\u4e2d\u5982\u4f55\u5904\u7406\u5e26\u6709\u591a\u4f4d\u5c0f\u6570\u7684\u5217\u8868\u4ee5\u4fdd\u7559\u4e09\u4f4d\uff1f<\/strong>
          \u5982\u679c\u4f60\u6709\u4e00\u4e2a\u5305\u542b\u591a\u4e2a\u6d6e\u70b9\u6570\u7684\u5217\u8868\uff0c\u5e76\u5e0c\u671b\u5c06\u6bcf\u4e2a\u6570\u5b57\u90fd\u4fdd\u7559\u4e09\u4f4d\u5c0f\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528\u5217\u8868\u63a8\u5bfc\u5f0f\u548cround()<\/code>\u51fd\u6570\u3002\u4f8b\u5982\uff1a  <\/p>\n
          numbers = [1.23456, 2.34567, 3.45678]\nformatted_numbers = [round(num, 3) for num in numbers]\nprint(formatted_numbers)  # \u8f93\u51fa [1.235, 2.346, 3.457]\n<\/code><\/pre>\n
          \u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u5feb\u901f\u5904\u7406\u5217\u8868\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5143\u7d20\uff0c\u4fdd\u7559\u6240\u9700\u7684\u5c0f\u6570\u4f4d\u6570\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u4f7f\u7528Python\u4fdd\u7559\u4e09\u4f4d\u5c0f\u6570\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u5305\u62ec\u4f7f\u7528\u5185\u7f6e\u51fd\u6570round()\u3001\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u3001Decimal\u6a21\u5757\u7b49\u3002 […]","protected":false},"author":3,"featured_media":1114073,"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\/1114065"}],"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=1114065"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1114065\/revisions"}],"predecessor-version":[{"id":1114075,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1114065\/revisions\/1114075"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1114073"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1114065"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1114065"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1114065"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}