{"id":1041464,"date":"2024-12-31T12:49:31","date_gmt":"2024-12-31T04:49:31","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1041464.html"},"modified":"2024-12-31T12:49:34","modified_gmt":"2024-12-31T04:49:34","slug":"python%e8%ae%a1%e7%ae%97%e7%bb%93%e6%9e%9c%e5%a6%82%e4%bd%95%e4%bf%9d%e7%95%99%e5%b0%8f%e6%95%b0","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1041464.html","title":{"rendered":"python\u8ba1\u7b97\u7ed3\u679c\u5982\u4f55\u4fdd\u7559\u5c0f\u6570"},"content":{"rendered":"

\"python\u8ba1\u7b97\u7ed3\u679c\u5982\u4f55\u4fdd\u7559\u5c0f\u6570\"<\/p>\n

Python\u4e2d\u4fdd\u7559\u5c0f\u6570\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u5305\u62ec\u4f7f\u7528\u5185\u7f6e\u51fd\u6570\u3001\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u3001\u4ee5\u53ca\u5e93\u51fd\u6570\u7b49\u3002\u5177\u4f53\u65b9\u6cd5\u5305\u62ec\uff1a\u4f7f\u7528round\u51fd\u6570\u3001\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u3001Decimal\u6a21\u5757\u3001\u4ee5\u53ca\u683c\u5f0f\u5316\u8f93\u51fa\u3002\u5176\u4e2d\uff0c\u4f7f\u7528round\u51fd\u6570\u662f\u6700\u5e38\u89c1\u7684\u65b9\u6cd5\u3002<\/strong><\/p>\n<\/p>\n

\u4f8b\u5982\uff0c\u4f7f\u7528 round()<\/code> \u51fd\u6570\u53ef\u4ee5\u65b9\u4fbf\u5730\u5bf9\u6d6e\u70b9\u6570\u8fdb\u884c\u56db\u820d\u4e94\u5165\uff0c\u5e76\u6307\u5b9a\u4fdd\u7559\u7684\u5c0f\u6570\u4f4d\u6570\u3002\u5047\u8bbe\u9700\u8981\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570\uff0c\u53ef\u4ee5\u8fd9\u6837\u5199\uff1a<\/p>\n<\/p>\n

result = round(3.14159, 2)<\/p>\n
print(result)  # \u8f93\u51fa 3.14<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u6b64\u5916\uff0c\u4f7f\u7528\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u65b9\u6cd5\u4e5f\u975e\u5e38\u5b9e\u7528\u3002\u901a\u8fc7\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u7cbe\u786e\u63a7\u5236\u8f93\u51fa\u7684\u5c0f\u6570\u4f4d\u6570\u3002\u8fd9\u79cd\u65b9\u6cd5\u5728\u5904\u7406\u8f93\u51fa\u7ed3\u679c\u65f6\u7279\u522b\u6709\u7528\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
result = 3.14159<\/p>\n
formatted_result = "{:.2f}".format(result)<\/p>\n
print(formatted_result)  # \u8f93\u51fa 3.14<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u65b9\u6cd5\u53ca\u5176\u5e94\u7528\u573a\u666f\u3002<\/p>\n<\/p>\n
\u4e00\u3001\u4f7f\u7528round\u51fd\u6570<\/h2>\n<\/p>\n
round()<\/code> \u51fd\u6570\u662fPython\u4e2d\u6700\u7b80\u5355\u76f4\u63a5\u7684\u56db\u820d\u4e94\u5165\u65b9\u6cd5\u3002\u5b83\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\uff0c\u7b2c\u4e00\u4e2a\u662f\u9700\u8981\u5904\u7406\u7684\u6d6e\u70b9\u6570\uff0c\u7b2c\u4e8c\u4e2a\u662f\u4fdd\u7559\u7684\u5c0f\u6570\u4f4d\u6570\u3002<\/p>\n<\/p>\n
# \u793a\u4f8b<\/p>\n
value = 123.456789<\/p>\n
rounded_value = round(value, 2)<\/p>\n
print(rounded_value)  # \u8f93\u51fa 123.46<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u4e2a\u65b9\u6cd5\u7684\u4f18\u70b9\u5728\u4e8e\u7b80\u5355\u6613\u7528\uff0c\u9002\u5408\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u7684\u56db\u820d\u4e94\u5165\u9700\u6c42\u3002\u7136\u800c\uff0c\u5b83\u4e5f\u6709\u4e00\u4e9b\u5c40\u9650\u6027\uff0c\u6bd4\u5982\u5728\u9700\u8981\u66f4\u590d\u6742\u7684\u820d\u5165\u89c4\u5219\u65f6\uff0c\u53ef\u80fd\u9700\u8981\u501f\u52a9\u5176\u4ed6\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u5b57\u7b26\u4e32\u683c\u5f0f\u5316<\/h2>\n<\/p>\n
Python\u63d0\u4f9b\u4e86\u591a\u79cd\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u65b9\u6cd5\uff0c\u53ef\u4ee5\u7cbe\u786e\u63a7\u5236\u5c0f\u6570\u7684\u8f93\u51fa\u683c\u5f0f\u3002\u5176\u4e2d\u6700\u5e38\u7528\u7684\u6709\u4ee5\u4e0b\u51e0\u79cd\uff1a<\/p>\n<\/p>\n
1\u3001\u4f7f\u7528format()\u65b9\u6cd5<\/h3>\n<\/p>\n
format()<\/code> \u65b9\u6cd5\u53ef\u4ee5\u6307\u5b9a\u6d6e\u70b9\u6570\u7684\u5c0f\u6570\u4f4d\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u683c\u5f0f\u5316\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<\/p>\n
value = 123.456789<\/p>\n
formatted_value = "{:.2f}".format(value)<\/p>\n
print(formatted_value)  # \u8f93\u51fa 123.46<\/p>\n
<\/code><\/pre>\n<\/p>\n
2\u3001\u4f7f\u7528f-string\uff08Python 3.6+\uff09<\/h3>\n<\/p>\n
f-string\u662fPython 3.6\u5f15\u5165\u7684\u4e00\u79cd\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u7684\u65b9\u5f0f\uff0c\u8bed\u6cd5\u66f4\u52a0\u7b80\u6d01\u3002<\/p>\n<\/p>\n
value = 123.456789<\/p>\n
formatted_value = f"{value:.2f}"<\/p>\n
print(formatted_value)  # \u8f93\u51fa 123.46<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u4e24\u79cd\u65b9\u6cd5\u7684\u4f18\u70b9\u5728\u4e8e\u8bed\u6cd5\u6e05\u6670\uff0c\u6613\u4e8e\u7406\u89e3\uff0c\u9002\u5408\u9700\u8981\u683c\u5f0f\u5316\u8f93\u51fa\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528Decimal\u6a21\u5757<\/h2>\n<\/p>\n
decimal<\/code> \u6a21\u5757\u63d0\u4f9b\u4e86\u66f4\u9ad8\u7cbe\u5ea6\u7684\u6d6e\u70b9\u6570\u8fd0\u7b97\uff0c\u9002\u7528\u4e8e\u9700\u8981\u7cbe\u786e\u63a7\u5236\u5c0f\u6570\u4f4d\u6570\u7684\u573a\u666f\u3002\u4f7f\u7528 Decimal<\/code> \u7c7b\u53ef\u4ee5\u907f\u514d\u6d6e\u70b9\u6570\u7cbe\u5ea6\u95ee\u9898\u3002<\/p>\n<\/p>\n
from decimal import Decimal, ROUND_HALF_UP<\/p>\n
value = Decimal("123.456789")<\/p>\n
rounded_value = value.quantize(Decimal("0.01"), rounding=ROUND_HALF_UP)<\/p>\n
print(rounded_value)  # \u8f93\u51fa 123.46<\/p>\n
<\/code><\/pre>\n<\/p>\n
Decimal<\/code> \u6a21\u5757\u7684\u4f18\u70b9\u5728\u4e8e\u7cbe\u5ea6\u9ad8\uff0c\u9002\u5408\u91d1\u878d\u8ba1\u7b97\u7b49\u5bf9\u7cbe\u5ea6\u8981\u6c42\u8f83\u9ad8\u7684\u573a\u666f\u3002\u7136\u800c\uff0c\u5b83\u7684\u4f7f\u7528\u76f8\u5bf9\u590d\u6742\uff0c\u9700\u8981\u5f15\u5165\u989d\u5916\u7684\u5e93\u3002<\/p>\n<\/p>\n
\u56db\u3001\u683c\u5f0f\u5316\u8f93\u51fa<\/h2>\n<\/p>\n
\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u683c\u5f0f\u5316\u8f93\u51fa\u4e5f\u662f\u4e00\u79cd\u5e38\u89c1\u7684\u9700\u6c42\u3002\u9664\u4e86\u4e0a\u8ff0\u65b9\u6cd5\u5916\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528 print<\/code> \u51fd\u6570\u7684\u683c\u5f0f\u5316\u53c2\u6570\u3002<\/p>\n<\/p>\n
value = 123.456789<\/p>\n
print(f"Formatted Value: {value:.2f}")  # \u8f93\u51fa Formatted Value: 123.46<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u70b9\u5728\u4e8e\u8bed\u6cd5\u7b80\u6d01\uff0c\u9002\u5408\u9700\u8981\u76f4\u63a5\u8f93\u51fa\u7ed3\u679c\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u5e94\u7528\u573a\u666f\u4e0e\u9009\u62e9<\/h2>\n<\/p>\n
\u4e0d\u540c\u7684\u65b9\u6cd5\u9002\u7528\u4e8e\u4e0d\u540c\u7684\u5e94\u7528\u573a\u666f\u3002\u5728\u9009\u62e9\u4fdd\u7559\u5c0f\u6570\u7684\u65b9\u6cd5\u65f6\uff0c\u9700\u8981\u8003\u8651\u5177\u4f53\u9700\u6c42\uff1a<\/p>\n<\/p>\n
1\u3001\u7b80\u5355\u56db\u820d\u4e94\u5165<\/h3>\n<\/p>\n
\u5982\u679c\u53ea\u662f\u9700\u8981\u7b80\u5355\u7684\u56db\u820d\u4e94\u5165\uff0c\u4f7f\u7528 round()<\/code> \u51fd\u6570\u5373\u53ef\u6ee1\u8db3\u9700\u6c42\u3002<\/p>\n<\/p>\n
2\u3001\u683c\u5f0f\u5316\u8f93\u51fa<\/h3>\n<\/p>\n
\u5982\u679c\u9700\u8981\u683c\u5f0f\u5316\u8f93\u51fa\u7ed3\u679c\uff0c\u4f7f\u7528\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u6216 f-string \u662f\u6700\u4f73\u9009\u62e9\u3002<\/p>\n<\/p>\n
3\u3001\u9ad8\u7cbe\u5ea6\u8fd0\u7b97<\/h3>\n<\/p>\n
\u5728\u9700\u8981\u9ad8\u7cbe\u5ea6\u8fd0\u7b97\u7684\u573a\u666f\u4e0b\uff0c\u5efa\u8bae\u4f7f\u7528 Decimal<\/code> \u6a21\u5757\u3002<\/p>\n<\/p>\n
4\u3001\u7efc\u5408\u5e94\u7528<\/h3>\n<\/p>\n
\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u7efc\u5408\u4f7f\u7528\u591a\u79cd\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c\u5728\u8ba1\u7b97\u8fc7\u7a0b\u4e2d\u4f7f\u7528 Decimal<\/code> \u6a21\u5757\u4ee5\u4fdd\u8bc1\u7cbe\u5ea6\uff0c\u5728\u8f93\u51fa\u7ed3\u679c\u65f6\u4f7f\u7528\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u4ee5\u4fdd\u8bc1\u683c\u5f0f\u4e00\u81f4\u3002<\/p>\n<\/p>\n
\u603b\u7684\u6765\u8bf4\uff0cPython\u63d0\u4f9b\u4e86\u591a\u79cd\u4fdd\u7559\u5c0f\u6570\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u9700\u6c42\u7075\u6d3b\u9009\u62e9\u3002\u5728\u65e5\u5e38\u5f00\u53d1\u4e2d\uff0c\u638c\u63e1\u8fd9\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u6709\u6548\u63d0\u9ad8\u4ee3\u7801\u7684\u51c6\u786e\u6027\u548c\u53ef\u8bfb\u6027\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u4e2d\u63a7\u5236\u8ba1\u7b97\u7ed3\u679c\u7684\u5c0f\u6570\u4f4d\u6570\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u5185\u7f6e\u7684round()<\/code>\u51fd\u6570\u6765\u63a7\u5236\u5c0f\u6570\u7684\u4f4d\u6570\u3002\u8be5\u51fd\u6570\u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\uff0c\u7b2c\u4e00\u4e2a\u662f\u8981\u820d\u5165\u7684\u6570\u5b57\uff0c\u7b2c\u4e8c\u4e2a\u662f\u8981\u4fdd\u7559\u7684\u5c0f\u6570\u4f4d\u6570\u3002\u4f8b\u5982\uff0cround(3.14159, 2)<\/code>\u5c06\u8fd4\u56de3.14\u3002\u6b64\u5916\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u6216f-string\u6765\u5b9e\u73b0\u66f4\u7075\u6d3b\u7684\u683c\u5f0f\u63a7\u5236\uff0c\u4f8b\u5982\uff1af"{value:.2f}"<\/code>\u5c06\u503c\u683c\u5f0f\u5316\u4e3a\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n
Python\u4e2d\u662f\u5426\u6709\u5176\u4ed6\u65b9\u6cd5\u4fdd\u7559\u5c0f\u6570\u4f4d\uff1f<\/strong>
\u662f\u7684\uff0c\u9664\u4e86round()<\/code>\u51fd\u6570\uff0cPython\u8fd8\u63d0\u4f9b\u4e86Decimal<\/code>\u6a21\u5757\uff0c\u53ef\u4ee5\u66f4\u7cbe\u786e\u5730\u63a7\u5236\u6570\u5b57\u7684\u8868\u793a\u548c\u820d\u5165\u65b9\u5f0f\u3002\u4f7f\u7528Decimal<\/code>\u7c7b\u65f6\uff0c\u53ef\u4ee5\u8bbe\u7f6e\u5c0f\u6570\u70b9\u540e\u7684\u4f4d\u6570\uff0c\u5e76\u907f\u514d\u6d6e\u70b9\u6570\u8fd0\u7b97\u5e26\u6765\u7684\u8bef\u5dee\u3002\u4f8b\u5982\uff1a  <\/p>\n
from decimal import Decimal, getcontext\ngetcontext().prec = 4  # \u8bbe\u7f6e\u603b\u7cbe\u5ea6\nresult = Decimal('1.2345') + Decimal('2.3456')\nprint(result)  # \u8f93\u51fa\u4e3a3.5801\n<\/code><\/pre>\n
\u5728Python\u4e2d\uff0c\u5982\u4f55\u683c\u5f0f\u5316\u8f93\u51fa\u4ee5\u4fdd\u7559\u5c0f\u6570\u4f4d\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u65b9\u6cd5\u6765\u8f93\u51fa\u4fdd\u7559\u5c0f\u6570\u4f4d\u7684\u7ed3\u679c\u3002\u5e38\u7528\u7684\u683c\u5f0f\u5316\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528str.format()<\/code>\u548cf-string\u3002\u4f7f\u7528str.format()<\/code>\u53ef\u4ee5\u8fd9\u6837\u5199\uff1a"{:.2f}".format(value)<\/code>\uff0c\u800c\u4f7f\u7528f-string\u5219\u53ef\u4ee5\u76f4\u63a5\u5728\u5b57\u7b26\u4e32\u524d\u52a0\u4e0af<\/code>\uff0c\u4f8b\u5982\uff1af"{value:.2f}"<\/code>\u3002\u8fd9\u4e24\u79cd\u65b9\u5f0f\u90fd\u53ef\u4ee5\u786e\u4fdd\u8f93\u51fa\u7ed3\u679c\u4e3a\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570\u7684\u5f62\u5f0f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Python\u4e2d\u4fdd\u7559\u5c0f\u6570\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u5305\u62ec\u4f7f\u7528\u5185\u7f6e\u51fd\u6570\u3001\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u3001\u4ee5\u53ca\u5e93\u51fd\u6570\u7b49\u3002\u5177\u4f53\u65b9\u6cd5\u5305\u62ec\uff1a\u4f7f\u7528round […]","protected":false},"author":3,"featured_media":1041471,"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\/1041464"}],"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=1041464"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1041464\/revisions"}],"predecessor-version":[{"id":1041473,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1041464\/revisions\/1041473"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1041471"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1041464"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1041464"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1041464"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}