{"id":1125020,"date":"2025-01-08T19:47:18","date_gmt":"2025-01-08T11:47:18","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1125020.html"},"modified":"2025-01-08T19:47:24","modified_gmt":"2025-01-08T11:47:24","slug":"python%e6%b5%ae%e7%82%b9%e6%95%b0%e5%a6%82%e4%bd%95%e5%9b%9b%e8%88%8d%e4%ba%94%e5%85%a5","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1125020.html","title":{"rendered":"python\u6d6e\u70b9\u6570\u5982\u4f55\u56db\u820d\u4e94\u5165"},"content":{"rendered":"

\"python\u6d6e\u70b9\u6570\u5982\u4f55\u56db\u820d\u4e94\u5165\"<\/p>\n

Python\u6d6e\u70b9\u6570\u56db\u820d\u4e94\u5165\u7684\u65b9\u6cd5\u5305\u62ec\uff1a\u4f7f\u7528\u5185\u7f6e\u51fd\u6570round()<\/code>\u3001\u4f7f\u7528math<\/code>\u6a21\u5757\u4e2d\u7684floor()<\/code>\u548cceil()<\/code>\u51fd\u6570\u3001\u4ee5\u53ca\u4f7f\u7528decimal<\/code>\u6a21\u5757\u5904\u7406\u9ad8\u7cbe\u5ea6\u9700\u6c42\u3002<\/strong>\u4ee5\u4e0b\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528\u8fd9\u4e9b\u65b9\u6cd5\u8fdb\u884c\u6d6e\u70b9\u6570\u56db\u820d\u4e94\u5165\uff0c\u5e76\u6df1\u5165\u63a2\u8ba8\u6bcf\u79cd\u65b9\u6cd5\u7684\u4f18\u7f3a\u70b9\u53ca\u9002\u7528\u573a\u666f\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528\u5185\u7f6e\u51fd\u6570round()<\/code><\/h3>\n<\/p>\n

Python\u63d0\u4f9b\u4e86\u4e00\u4e2a\u975e\u5e38\u65b9\u4fbf\u7684\u5185\u7f6e\u51fd\u6570round()<\/code>\u6765\u5904\u7406\u6d6e\u70b9\u6570\u7684\u56db\u820d\u4e94\u5165\u3002\u57fa\u672c\u7528\u6cd5\u662fround(number[, ndigits])<\/code>\uff0c\u5176\u4e2dnumber<\/code>\u662f\u8981\u56db\u820d\u4e94\u5165\u7684\u6d6e\u70b9\u6570\uff0cndigits<\/code>\u662f\u4fdd\u7559\u7684\u5c0f\u6570\u4f4d\u6570\uff08\u9ed8\u8ba4\u503c\u4e3a0\uff09\u3002<\/p>\n<\/p>\n

\u57fa\u672c\u7528\u6cd5<\/h4>\n<\/p>\n

round()<\/code>\u51fd\u6570\u7684\u4f7f\u7528\u975e\u5e38\u7b80\u5355\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u793a\u4f8b\uff1a<\/p>\n<\/p>\n

print(round(3.14159))       # \u8f93\u51fa: 3<\/p>\n
print(round(3.14159, 2))    # \u8f93\u51fa: 3.14<\/p>\n
print(round(3.14159, 3))    # \u8f93\u51fa: 3.142<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u6838\u5fc3\u91cd\u70b9\uff1a<\/strong>round()<\/code>\u51fd\u6570\u53ef\u4ee5\u6307\u5b9a\u4fdd\u7559\u7684\u5c0f\u6570\u4f4d\u6570\uff0c\u975e\u5e38\u9002\u5408\u65e5\u5e38\u7684\u6570\u503c\u5904\u7406\u3002\u4f46\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5b83\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u53ef\u80fd\u4f1a\u51fa\u73b0\u820d\u5165\u8bef\u5dee\u3002<\/p>\n<\/p>\n
\u5904\u7406\u820d\u5165\u8bef\u5dee<\/h4>\n<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528round()<\/code>\u51fd\u6570\u53ef\u80fd\u4f1a\u51fa\u73b0\u820d\u5165\u8bef\u5dee\u3002\u8fd9\u662f\u56e0\u4e3a\u6d6e\u70b9\u6570\u5728\u8ba1\u7b97\u673a\u5185\u90e8\u662f\u4ee5\u4e8c\u8fdb\u5236\u5f62\u5f0f\u5b58\u50a8\u7684\uff0c\u6709\u65f6\u65e0\u6cd5\u7cbe\u786e\u8868\u793a\u5341\u8fdb\u5236\u6570\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
print(round(2.675, 2))    # \u9884\u671f\u8f93\u51fa: 2.68\uff0c\u5b9e\u9645\u8f93\u51fa: 2.67<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u662f\u56e0\u4e3a2.675\u5728\u4e8c\u8fdb\u5236\u8868\u793a\u4e2d\u5e76\u4e0d\u662f\u4e00\u4e2a\u7cbe\u786e\u7684\u6570\u503c\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528math<\/code>\u6a21\u5757\u4e2d\u7684floor()<\/code>\u548cceil()<\/code><\/h3>\n<\/p>\n
Python\u7684math<\/code>\u6a21\u5757\u63d0\u4f9b\u4e86\u4e24\u4e2a\u51fd\u6570floor()<\/code>\u548cceil()<\/code>\uff0c\u5206\u522b\u7528\u4e8e\u5411\u4e0b\u53d6\u6574\u548c\u5411\u4e0a\u53d6\u6574\u3002\u8fd9\u4e24\u4e2a\u51fd\u6570\u4e0d\u76f4\u63a5\u6267\u884c\u56db\u820d\u4e94\u5165\u64cd\u4f5c\uff0c\u4f46\u53ef\u4ee5\u7ed3\u5408\u5176\u4ed6\u65b9\u6cd5\u5b9e\u73b0\u56db\u820d\u4e94\u5165\u3002<\/p>\n<\/p>\n
floor()<\/code>\u51fd\u6570<\/h4>\n<\/p>\n
floor()<\/code>\u51fd\u6570\u8fd4\u56de\u5c0f\u4e8e\u6216\u7b49\u4e8e\u7ed9\u5b9a\u6570\u7684\u6700\u5927\u6574\u6570\uff1a<\/p>\n<\/p>\n
import math<\/p>\n
print(math.floor(3.7))    # \u8f93\u51fa: 3<\/p>\n
print(math.floor(-3.7))   # \u8f93\u51fa: -4<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u6838\u5fc3\u91cd\u70b9\uff1a<\/strong>floor()<\/code>\u51fd\u6570\u975e\u5e38\u9002\u5408\u9700\u8981\u5411\u4e0b\u53d6\u6574\u7684\u573a\u5408\u3002<\/p>\n<\/p>\n
ceil()<\/code>\u51fd\u6570<\/h4>\n<\/p>\n
ceil()<\/code>\u51fd\u6570\u8fd4\u56de\u5927\u4e8e\u6216\u7b49\u4e8e\u7ed9\u5b9a\u6570\u7684\u6700\u5c0f\u6574\u6570\uff1a<\/p>\n<\/p>\n
import math<\/p>\n
print(math.ceil(3.1))     # \u8f93\u51fa: 4<\/p>\n
print(math.ceil(-3.1))    # \u8f93\u51fa: -3<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u6838\u5fc3\u91cd\u70b9\uff1a<\/strong>ceil()<\/code>\u51fd\u6570\u975e\u5e38\u9002\u5408\u9700\u8981\u5411\u4e0a\u53d6\u6574\u7684\u573a\u5408\u3002<\/p>\n<\/p>\n
\u5b9e\u73b0\u56db\u820d\u4e94\u5165<\/h4>\n<\/p>\n
\u53ef\u4ee5\u7ed3\u5408floor()<\/code>\u548cceil()<\/code>\u51fd\u6570\u5b9e\u73b0\u56db\u820d\u4e94\u5165\uff1a<\/p>\n<\/p>\n
def custom_round(number):<\/p>\n
    if number - math.floor(number) < 0.5:<\/p>\n
        return math.floor(number)<\/p>\n
    else:<\/p>\n
        return math.ceil(number)<\/p>\n
print(custom_round(3.5))   # \u8f93\u51fa: 4<\/p>\n
print(custom_round(3.4))   # \u8f93\u51fa: 3<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528decimal<\/code>\u6a21\u5757\u5904\u7406\u9ad8\u7cbe\u5ea6\u9700\u6c42<\/h3>\n<\/p>\n
\u5bf9\u4e8e\u9700\u8981\u9ad8\u7cbe\u5ea6\u8ba1\u7b97\u7684\u573a\u5408\uff0cPython\u63d0\u4f9b\u4e86decimal<\/code>\u6a21\u5757\u3002\u8fd9\u4e2a\u6a21\u5757\u63d0\u4f9b\u4e86Decimal<\/code>\u7c7b\u578b\uff0c\u53ef\u4ee5\u7cbe\u786e\u63a7\u5236\u6570\u503c\u7684\u820d\u5165\u3002<\/p>\n<\/p>\n
\u57fa\u672c\u7528\u6cd5<\/h4>\n<\/p>\n
\u9996\u5148\u9700\u8981\u5bfc\u5165decimal<\/code>\u6a21\u5757\uff1a<\/p>\n<\/p>\n
from decimal import Decimal, ROUND_HALF_UP<\/p>\n
number = Decimal('2.675')<\/p>\n
rounded_number = number.quantize(Decimal('0.01'), rounding=ROUND_HALF_UP)<\/p>\n
print(rounded_number)    # \u8f93\u51fa: 2.68<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u6838\u5fc3\u91cd\u70b9\uff1a<\/strong>decimal<\/code>\u6a21\u5757\u53ef\u4ee5\u7cbe\u786e\u63a7\u5236\u820d\u5165\u65b9\u5f0f\uff0c\u9002\u5408\u9ad8\u7cbe\u5ea6\u9700\u6c42\u7684\u573a\u5408\u3002<\/p>\n<\/p>\n
\u820d\u5165\u65b9\u5f0f<\/h4>\n<\/p>\n
decimal<\/code>\u6a21\u5757\u63d0\u4f9b\u4e86\u591a\u79cd\u820d\u5165\u65b9\u5f0f\uff0c\u5982ROUND_HALF_UP<\/code>\u3001ROUND_DOWN<\/code>\u3001ROUND_UP<\/code>\u7b49\uff0c\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\uff1a<\/p>\n<\/p>\n
from decimal import Decimal, ROUND_DOWN<\/p>\n
number = Decimal('2.675')<\/p>\n
rounded_number = number.quantize(Decimal('0.01'), rounding=ROUND_DOWN)<\/p>\n
print(rounded_number)    # \u8f93\u51fa: 2.67<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u6838\u5fc3\u91cd\u70b9\uff1a<\/strong>\u4e0d\u540c\u7684\u820d\u5165\u65b9\u5f0f\u9002\u7528\u4e8e\u4e0d\u540c\u7684\u4e1a\u52a1\u573a\u666f\uff0c\u9009\u62e9\u9002\u5408\u7684\u820d\u5165\u65b9\u5f0f\u975e\u5e38\u91cd\u8981\u3002<\/p>\n<\/p>\n
\u56db\u3001\u603b\u7ed3\u4e0e\u5e94\u7528\u573a\u666f<\/h3>\n<\/p>\n
\u7efc\u5408\u6bd4\u8f83<\/h4>\n<\/p>\n
    \n
  1. round()<\/code>\u51fd\u6570\uff1a<\/strong> \u7b80\u5355\u6613\u7528\uff0c\u9002\u5408\u5927\u591a\u6570\u65e5\u5e38\u9700\u6c42\uff0c\u4f46\u53ef\u80fd\u4f1a\u6709\u820d\u5165\u8bef\u5dee\u3002<\/li>\n
  2. floor()<\/code>\u548cceil()<\/code>\u51fd\u6570\uff1a<\/strong> \u9002\u5408\u9700\u8981\u5411\u4e0b\u6216\u5411\u4e0a\u53d6\u6574\u7684\u573a\u5408\uff0c\u914d\u5408\u5176\u4ed6\u65b9\u6cd5\u53ef\u4ee5\u5b9e\u73b0\u56db\u820d\u4e94\u5165\u3002<\/li>\n
  3. decimal<\/code>\u6a21\u5757\uff1a<\/strong> \u9002\u5408\u9ad8\u7cbe\u5ea6\u9700\u6c42\uff0c\u53ef\u7cbe\u786e\u63a7\u5236\u820d\u5165\u65b9\u5f0f\uff0c\u4f46\u4f7f\u7528\u76f8\u5bf9\u590d\u6742\u3002<\/li>\n<\/ol>\n
    \u5177\u4f53\u5e94\u7528\u573a\u666f<\/h4>\n<\/p>\n
      \n
    1. \u8d22\u52a1\u8ba1\u7b97\uff1a<\/strong> \u4f7f\u7528decimal<\/code>\u6a21\u5757\uff0c\u786e\u4fdd\u6570\u503c\u8ba1\u7b97\u7cbe\u786e\u65e0\u8bef\u3002<\/li>\n
    2. \u65e5\u5e38\u6570\u503c\u5904\u7406\uff1a<\/strong> \u4f7f\u7528round()<\/code>\u51fd\u6570\uff0c\u7b80\u5355\u5feb\u6377\u3002<\/li>\n
    3. \u7279\u5b9a\u53d6\u6574\u9700\u6c42\uff1a<\/strong> \u4f7f\u7528floor()<\/code>\u548cceil()<\/code>\u51fd\u6570\uff0c\u9002\u5408\u9700\u8981\u660e\u786e\u5411\u4e0b\u6216\u5411\u4e0a\u53d6\u6574\u7684\u573a\u5408\u3002<\/li>\n<\/ol>\n
      \u603b\u4e4b\uff0c\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u89e3\u51b3Python\u6d6e\u70b9\u6570\u7684\u56db\u820d\u4e94\u5165\u95ee\u9898\u3002\u65e0\u8bba\u662f\u8ffd\u6c42\u7b80\u5355\u6613\u7528\u8fd8\u662f\u9ad8\u7cbe\u5ea6\uff0c\u90fd\u6709\u76f8\u5e94\u7684\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<\/p>\n
      \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
       \u5982\u4f55\u5728Python\u4e2d\u5b9e\u73b0\u6d6e\u70b9\u6570\u7684\u56db\u820d\u4e94\u5165\uff1f<\/strong>
      \u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u5185\u7f6e\u7684round()<\/code>\u51fd\u6570\u8fdb\u884c\u6d6e\u70b9\u6570\u7684\u56db\u820d\u4e94\u5165\u3002\u8be5\u51fd\u6570\u7684\u57fa\u672c\u8bed\u6cd5\u662fround(number, ndigits)<\/code>\uff0c\u5176\u4e2dnumber<\/code>\u662f\u9700\u8981\u56db\u820d\u4e94\u5165\u7684\u6d6e\u70b9\u6570\uff0cndigits<\/code>\u662f\u56db\u820d\u4e94\u5165\u540e\u4fdd\u7559\u7684\u5c0f\u6570\u4f4d\u6570\u3002\u4f8b\u5982\uff0cround(3.14159, 2)<\/code>\u5c06\u8fd4\u56de3.14<\/code>\uff0c\u56e0\u4e3a\u5b83\u5c06\u6570\u5b57\u56db\u820d\u4e94\u5165\u5230\u5c0f\u6570\u70b9\u540e\u4e24\u4f4d\u3002<\/p>\n
      \u4f7f\u7528Decimal\u6a21\u5757\u8fdb\u884c\u66f4\u7cbe\u786e\u7684\u56db\u820d\u4e94\u5165\u6709\u4ec0\u4e48\u4f18\u52bf\uff1f<\/strong>
      \u5bf9\u4e8e\u9700\u8981\u9ad8\u7cbe\u5ea6\u8ba1\u7b97\u7684\u573a\u666f\uff0cPython\u7684decimal<\/code>\u6a21\u5757\u63d0\u4f9b\u4e86\u66f4\u7cbe\u786e\u7684\u6d6e\u70b9\u6570\u5904\u7406\u3002\u4e0e\u5185\u7f6e\u7684float<\/code>\u7c7b\u578b\u4e0d\u540c\uff0cDecimal<\/code>\u53ef\u4ee5\u907f\u514d\u6d6e\u70b9\u6570\u8868\u793a\u4e0a\u7684\u8bef\u5dee\u3002\u4f7f\u7528Decimal<\/code>\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7quantize()<\/code>\u65b9\u6cd5\u6307\u5b9a\u56db\u820d\u4e94\u5165\u7684\u65b9\u5f0f\u3002\u4f8b\u5982\uff0cfrom decimal import Decimal<\/code>\u548cd = Decimal('3.14159').quantize(Decimal('0.01'))<\/code>\u53ef\u4ee5\u5b9e\u73b0\u5bf9\u6570\u5b57\u7684\u7cbe\u786e\u63a7\u5236\u3002<\/p>\n
      Python\u4e2d\u5982\u4f55\u63a7\u5236\u56db\u820d\u4e94\u5165\u7684\u65b9\u5411\uff1f<\/strong>
      \u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u6307\u5b9a\u4e0d\u540c\u7684\u7b56\u7565\u6765\u63a7\u5236\u56db\u820d\u4e94\u5165\u7684\u65b9\u5411\u3002\u4f7f\u7528decimal<\/code>\u6a21\u5757\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7ROUND_HALF_UP<\/code>\u3001ROUND_HALF_DOWN<\/code>\u7b49\u4e0d\u540c\u7684\u820d\u5165\u6a21\u5f0f\u6765\u5b9e\u73b0\u3002\u4f8b\u5982\uff0cDecimal('2.5').quantize(Decimal('1'), rounding=ROUND_HALF_UP)<\/code>\u5c06\u8fd4\u56de3<\/code>\uff0c\u800cROUND_HALF_DOWN<\/code>\u5219\u8fd4\u56de2<\/code>\u3002\u8fd9\u79cd\u7075\u6d3b\u6027\u4f7f\u5f97\u5f00\u53d1\u8005\u53ef\u4ee5\u6839\u636e\u9700\u6c42\u9009\u62e9\u9002\u5408\u7684\u56db\u820d\u4e94\u5165\u65b9\u5f0f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Python\u6d6e\u70b9\u6570\u56db\u820d\u4e94\u5165\u7684\u65b9\u6cd5\u5305\u62ec\uff1a\u4f7f\u7528\u5185\u7f6e\u51fd\u6570round()\u3001\u4f7f\u7528math\u6a21\u5757\u4e2d\u7684floor()\u548cceil […]","protected":false},"author":3,"featured_media":1125034,"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\/1125020"}],"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=1125020"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1125020\/revisions"}],"predecessor-version":[{"id":1125037,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1125020\/revisions\/1125037"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1125034"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1125020"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1125020"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1125020"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}