{"id":1087844,"date":"2025-01-08T13:38:54","date_gmt":"2025-01-08T05:38:54","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1087844.html"},"modified":"2025-01-08T13:38:56","modified_gmt":"2025-01-08T05:38:56","slug":"python%e4%b8%ad%e5%a6%82%e4%bd%95%e8%ae%be%e7%bd%ae%e5%b0%8f%e6%95%b0%e4%bd%8d%e7%bd%ae-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1087844.html","title":{"rendered":"python\u4e2d\u5982\u4f55\u8bbe\u7f6e\u5c0f\u6570\u4f4d\u7f6e"},"content":{"rendered":"

\"python\u4e2d\u5982\u4f55\u8bbe\u7f6e\u5c0f\u6570\u4f4d\u7f6e\"<\/p>\n

\u5728Python\u4e2d\u8bbe\u7f6e\u5c0f\u6570\u4f4d\u7f6e\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u6700\u9002\u5408\u7684\u65b9\u5f0f\u3002\u4f7f\u7528\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u3001\u4f7f\u7528round()<\/code>\u51fd\u6570\u3001\u5229\u7528decimal<\/code>\u6a21\u5757<\/strong>\u662f\u8bbe\u7f6e\u5c0f\u6570\u4f4d\u7f6e\u7684\u5e38\u89c1\u65b9\u6cd5\u3002\u4e0b\u9762\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528\u8fd9\u4e9b\u65b9\u6cd5\u6765\u8bbe\u7f6e\u5c0f\u6570\u4f4d\u7f6e\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528\u683c\u5f0f\u5316\u5b57\u7b26\u4e32<\/h3>\n<\/p>\n

\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u63d0\u4f9b\u4e86\u4e00\u79cd\u7075\u6d3b\u7684\u65b9\u6cd5\u6765\u63a7\u5236\u5c0f\u6570\u70b9\u540e\u7684\u4f4d\u6570\u3002\u6700\u5e38\u7528\u7684\u65b9\u5f0f\u6709str.format()<\/code>\u65b9\u6cd5\u548cf-string\uff08Python 3.6\u53ca\u4ee5\u4e0a\u7248\u672c\uff09\u3002<\/p>\n<\/p>\n

1.1\u3001\u4f7f\u7528str.format()<\/code>\u65b9\u6cd5<\/h4>\n<\/p>\n

str.format()<\/code>\u65b9\u6cd5\u5141\u8bb8\u4f60\u6307\u5b9a\u5c0f\u6570\u70b9\u540e\u7684\u4f4d\u6570\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u5c06\u4e00\u4e2a\u6d6e\u70b9\u6570\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570\uff0c\u53ef\u4ee5\u8fd9\u6837\u5199\uff1a<\/p>\n<\/p>\n

num = 3.1415926<\/p>\n
formatted_num = "{:.2f}".format(num)<\/p>\n
print(formatted_num)  # \u8f93\u51fa: 3.14<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c{:.2f}<\/code>\u8868\u793a\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570\u3002<\/p>\n<\/p>\n
1.2\u3001\u4f7f\u7528f-string<\/h4>\n<\/p>\n
f-string\u662fPython 3.6\u5f15\u5165\u7684\u4e00\u79cd\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u7684\u65b9\u5f0f\uff0c\u5b83\u66f4\u7b80\u6d01\u3001\u66f4\u76f4\u89c2\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
num = 3.1415926<\/p>\n
formatted_num = f"{num:.2f}"<\/p>\n
print(formatted_num)  # \u8f93\u51fa: 3.14<\/p>\n
<\/code><\/pre>\n<\/p>\n
f-string\u4e0d\u4ec5\u8bed\u6cd5\u66f4\u52a0\u7b80\u6d01\uff0c\u800c\u4e14\u8fd0\u884c\u901f\u5ea6\u4e5f\u66f4\u5feb\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528round()<\/code>\u51fd\u6570<\/h3>\n<\/p>\n
round()<\/code>\u51fd\u6570\u53ef\u4ee5\u7528\u6765\u5c06\u4e00\u4e2a\u6d6e\u70b9\u6570\u56db\u820d\u4e94\u5165\u5230\u6307\u5b9a\u7684\u5c0f\u6570\u4f4d\u6570\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
num = 3.1415926<\/p>\n
rounded_num = round(num, 2)<\/p>\n
print(rounded_num)  # \u8f93\u51fa: 3.14<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cround(num, 2)<\/code>\u8868\u793a\u5c06num<\/code>\u56db\u820d\u4e94\u5165\u5230\u5c0f\u6570\u70b9\u540e\u4e24\u4f4d\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528decimal<\/code>\u6a21\u5757<\/h3>\n<\/p>\n
decimal<\/code>\u6a21\u5757\u63d0\u4f9b\u4e86\u66f4\u9ad8\u7cbe\u5ea6\u7684\u6d6e\u70b9\u8fd0\u7b97\uff0c\u53ef\u4ee5\u66f4\u52a0\u7cbe\u786e\u5730\u63a7\u5236\u5c0f\u6570\u4f4d\u6570\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<\/p>\n
from decimal import Decimal, getcontext<\/p>\n
getcontext().prec = 4  # \u8bbe\u7f6e\u5168\u5c40\u7cbe\u5ea6<\/p>\n
num = Decimal('3.1415926')<\/p>\n
formatted_num = round(num, 2)<\/p>\n
print(formatted_num)  # \u8f93\u51fa: 3.14<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cgetcontext().prec = 4<\/code>\u8bbe\u7f6e\u4e86\u5168\u5c40\u7684\u7cbe\u5ea6\uff0c\u800cDecimal<\/code>\u7c7b\u578b\u53ef\u4ee5\u66f4\u52a0\u7cbe\u786e\u5730\u63a7\u5236\u5c0f\u6570\u4f4d\u6570\uff0c\u9002\u7528\u4e8e\u5bf9\u6570\u503c\u7cbe\u5ea6\u8981\u6c42\u8f83\u9ad8\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
\u56db\u3001\u5e94\u7528\u573a\u666f\u53ca\u4ee3\u7801\u793a\u4f8b<\/h3>\n<\/p>\n
4.1\u3001\u8d22\u52a1\u62a5\u8868\u4e2d\u7684\u5c0f\u6570\u4f4d\u6570\u63a7\u5236<\/h4>\n<\/p>\n
\u5728\u8d22\u52a1\u62a5\u8868\u4e2d\uff0c\u7ecf\u5e38\u9700\u8981\u5bf9\u91d1\u989d\u8fdb\u884c\u7cbe\u786e\u5230\u5c0f\u6570\u70b9\u540e\u4e24\u4f4d\u7684\u63a7\u5236\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<\/p>\n
amount = 1234.56789<\/p>\n
\u4f7f\u7528str.format()\u65b9\u6cd5<\/strong><\/h2>\n
formatted_amount = "{:.2f}".format(amount)<\/p>\n
print(f"Formatted amount: {formatted_amount}")  # \u8f93\u51fa: 1234.57<\/p>\n
\u4f7f\u7528f-string<\/strong><\/h2>\n
formatted_amount_f = f"{amount:.2f}"<\/p>\n
print(f"Formatted amount with f-string: {formatted_amount_f}")  # \u8f93\u51fa: 1234.57<\/p>\n
\u4f7f\u7528round()\u51fd\u6570<\/strong><\/h2>\n
rounded_amount = round(amount, 2)<\/p>\n
print(f"Rounded amount: {rounded_amount}")  # \u8f93\u51fa: 1234.57<\/p>\n
\u4f7f\u7528decimal\u6a21\u5757<\/strong><\/h2>\n
from decimal import Decimal<\/p>\n
decimal_amount = Decimal(str(amount))<\/p>\n
formatted_decimal_amount = round(decimal_amount, 2)<\/p>\n
print(f"Formatted amount with decimal: {formatted_decimal_amount}")  # \u8f93\u51fa: 1234.57<\/p>\n
<\/code><\/pre>\n<\/p>\n
4.2\u3001\u79d1\u5b66\u8ba1\u7b97\u4e2d\u7684\u5c0f\u6570\u4f4d\u6570\u63a7\u5236<\/h4>\n<\/p>\n
\u5728\u79d1\u5b66\u8ba1\u7b97\u4e2d\uff0c\u7cbe\u5ea6\u63a7\u5236\u5c24\u4e3a\u91cd\u8981\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<\/p>\n
import math<\/p>\n
pi = math.pi<\/p>\n
\u4f7f\u7528str.format()\u65b9\u6cd5<\/strong><\/h2>\n
formatted_pi = "{:.6f}".format(pi)<\/p>\n
print(f"Formatted pi: {formatted_pi}")  # \u8f93\u51fa: 3.141593<\/p>\n
\u4f7f\u7528f-string<\/strong><\/h2>\n
formatted_pi_f = f"{pi:.6f}"<\/p>\n
print(f"Formatted pi with f-string: {formatted_pi_f}")  # \u8f93\u51fa: 3.141593<\/p>\n
\u4f7f\u7528round()\u51fd\u6570<\/strong><\/h2>\n
rounded_pi = round(pi, 6)<\/p>\n
print(f"Rounded pi: {rounded_pi}")  # \u8f93\u51fa: 3.141593<\/p>\n
\u4f7f\u7528decimal\u6a21\u5757<\/strong><\/h2>\n
from decimal import Decimal<\/p>\n
decimal_pi = Decimal(str(pi))<\/p>\n
formatted_decimal_pi = round(decimal_pi, 6)<\/p>\n
print(f"Formatted pi with decimal: {formatted_decimal_pi}")  # \u8f93\u51fa: 3.141593<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e94\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
\u5728Python\u4e2d\uff0c\u63a7\u5236\u5c0f\u6570\u4f4d\u6570\u7684\u65b9\u6cd5\u591a\u79cd\u591a\u6837\uff0c\u5e38\u7528\u7684\u6709\u4f7f\u7528\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u3001\u4f7f\u7528round()<\/code>\u51fd\u6570\u3001\u5229\u7528decimal<\/code>\u6a21\u5757<\/strong>\u3002\u9009\u62e9\u4f55\u79cd\u65b9\u6cd5\u53d6\u51b3\u4e8e\u5177\u4f53\u7684\u4f7f\u7528\u573a\u666f\u548c\u5bf9\u7cbe\u5ea6\u7684\u8981\u6c42\u3002\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u65b9\u6cd5\u7b80\u6d01\u76f4\u89c2\uff0c\u9002\u7528\u4e8e\u5927\u591a\u6570\u573a\u666f\uff1bround()<\/code>\u51fd\u6570\u7b80\u5355\u6613\u7528\uff0c\u9002\u5408\u5feb\u901f\u56db\u820d\u4e94\u5165\uff1bdecimal<\/code>\u6a21\u5757\u5219\u63d0\u4f9b\u4e86\u66f4\u9ad8\u7cbe\u5ea6\u7684\u63a7\u5236\uff0c\u9002\u7528\u4e8e\u5bf9\u6570\u503c\u7cbe\u5ea6\u8981\u6c42\u4e25\u683c\u7684\u573a\u666f\u3002\u5e0c\u671b\u8fd9\u7bc7\u6587\u7ae0\u80fd\u591f\u5e2e\u52a9\u4f60\u5728Python\u7f16\u7a0b\u4e2d\u66f4\u597d\u5730\u63a7\u5236\u5c0f\u6570\u4f4d\u6570\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u4e2d\u63a7\u5236\u5c0f\u6570\u70b9\u540e\u7684\u4f4d\u6570\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u5185\u7f6e\u7684round()\u51fd\u6570\u6765\u63a7\u5236\u5c0f\u6570\u4f4d\u6570\u3002\u4f8b\u5982\uff0cround(3.14159, 2)\u5c06\u8fd4\u56de3.14\u3002\u5bf9\u4e8e\u683c\u5f0f\u5316\u8f93\u51fa\uff0c\u53ef\u4ee5\u4f7f\u7528\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u65b9\u6cd5\uff0c\u5982f-strings\u6216format()\u65b9\u6cd5\u6765\u6307\u5b9a\u5c0f\u6570\u4f4d\u6570\uff0c\u793a\u4f8b\uff1af"{value:.2f}"\u5c06value\u683c\u5f0f\u5316\u4e3a\u5c0f\u6570\u70b9\u540e\u4e24\u4f4d\u3002<\/p>\n
\u662f\u5426\u53ef\u4ee5\u4f7f\u7528\u5176\u4ed6\u5e93\u6765\u5904\u7406\u5c0f\u6570\u4f4d\u6570\uff1f<\/strong>
\u662f\u7684\uff0cPython\u4e2d\u6709\u591a\u4e2a\u5e93\u53ef\u4ee5\u5e2e\u52a9\u5904\u7406\u5c0f\u6570\u4f4d\u6570\u7684\u95ee\u9898\u3002Decimal\u6a21\u5757\u63d0\u4f9b\u4e86\u66f4\u9ad8\u7684\u7cbe\u5ea6\u548c\u63a7\u5236\uff0c\u5c24\u5176\u9002\u5408\u91d1\u878d\u8ba1\u7b97\u3002\u901a\u8fc7Decimal(value).quantize(Decimal('0.00'))\u53ef\u4ee5\u8bbe\u7f6e\u5c0f\u6570\u70b9\u540e\u4e24\u4f4d\u3002\u6b64\u5916\uff0cNumPy\u5e93\u4e5f\u63d0\u4f9b\u4e86\u5bf9\u6570\u7ec4\u548c\u77e9\u9635\u7684\u64cd\u4f5c\uff0c\u652f\u6301\u6307\u5b9a\u5c0f\u6570\u4f4d\u6570\u3002<\/p>\n
\u5982\u4f55\u786e\u4fdd\u5728Python\u4e2d\u8fdb\u884c\u56db\u820d\u4e94\u5165\u65f6\u7684\u51c6\u786e\u6027\uff1f<\/strong>
\u5728Python\u4e2d\u4f7f\u7528round()\u51fd\u6570\u8fdb\u884c\u56db\u820d\u4e94\u5165\u65f6\uff0c\u53ef\u80fd\u4f1a\u9047\u5230\u4e00\u4e9b\u7cbe\u5ea6\u95ee\u9898\u3002\u4e3a\u786e\u4fdd\u51c6\u786e\u6027\uff0c\u5efa\u8bae\u4f7f\u7528Decimal\u6a21\u5757\u3002\u8be5\u6a21\u5757\u80fd\u591f\u63d0\u4f9b\u66f4\u7cbe\u786e\u7684\u63a7\u5236\u548c\u907f\u514d\u6d6e\u70b9\u6570\u7684\u4e0d\u7cbe\u786e\u8868\u793a\u3002\u4f7f\u7528Decimal\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6e\u4e0a\u4e0b\u6587\u6765\u786e\u4fdd\u7ed3\u679c\u7b26\u5408\u9884\u671f\u7684\u7cbe\u5ea6\u548c\u820d\u5165\u6a21\u5f0f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\u8bbe\u7f6e\u5c0f\u6570\u4f4d\u7f6e\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u6700\u9002\u5408\u7684\u65b9\u5f0f\u3002\u4f7f\u7528\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u3001\u4f7f\u7528round( […]","protected":false},"author":3,"featured_media":1087850,"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\/1087844"}],"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=1087844"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1087844\/revisions"}],"predecessor-version":[{"id":1087853,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1087844\/revisions\/1087853"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1087850"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1087844"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1087844"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1087844"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}