{"id":178205,"date":"2024-05-08T19:45:37","date_gmt":"2024-05-08T11:45:37","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/178205.html"},"modified":"2024-05-08T19:45:44","modified_gmt":"2024-05-08T11:45:44","slug":"%e6%80%8e%e6%a0%b7%e4%bd%bfpython%e8%ae%a1%e7%ae%97%e7%bb%93%e6%9e%9c%e6%98%be%e7%a4%ba%e5%b0%8f%e6%95%b0","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/178205.html","title":{"rendered":"\u600e\u6837\u4f7fpython\u8ba1\u7b97\u7ed3\u679c\u663e\u793a\u5c0f\u6570"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/27062547\/757034c3-1ae3-4ce7-b025-a94d03167966.webp\" alt=\"\u600e\u6837\u4f7fpython\u8ba1\u7b97\u7ed3\u679c\u663e\u793a\u5c0f\u6570\" \/><\/p>\n<p><p><strong>\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u900f\u8fc7\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u3001\u4f7f\u7528\u5185\u5efa\u51fd\u6570<code>round<\/code>\u3001\u6d6e\u70b9\u6570\u9664\u6cd5\u6216\u8005\u5bfc\u5165\u4e13\u95e8\u7684\u6570\u5b66\u5e93\u5982<code>decimal<\/code>\u6765\u663e\u793a\u5c0f\u6570\u3002<\/strong> \u5404\u65b9\u6cd5\u9002\u7528\u4e8e\u4e0d\u540c\u7684\u573a\u666f\uff0c\u5e76\u53ef\u6839\u636e\u7cbe\u5ea6\u8981\u6c42\u8fdb\u884c\u9009\u62e9\u548c\u8c03\u6574\u3002\u5bf9\u4e8e\u5927\u591a\u6570\u7b80\u5355\u7684\u9700\u6c42\uff0c\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u6216\u8005<code>round<\/code>\u51fd\u6570\u901a\u5e38\u5c31\u8db3\u591f\u4f7f\u7528\u3002\u800c\u5bf9\u4e8e\u9700\u8981\u9ad8\u7cbe\u5ea6\u6570\u503c\u8ba1\u7b97\u7684\u573a\u666f\uff0c<code>decimal<\/code>\u6a21\u5757\u4ee3\u8868\u4e00\u4e2a\u66f4\u597d\u7684\u9009\u62e9\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u4f7f\u7528\u683c\u5f0f\u5316\u5b57\u7b26\u4e32<\/h3>\n<\/p>\n<p><p><strong>\u683c\u5f0f\u5316\u5b57\u7b26\u4e32<\/strong> \u662f\u5728Python\u4e2d\u63a7\u5236\u8f93\u51fa\u683c\u5f0f\u7684\u4e00\u79cd\u65b9\u5f0f\u3002\u4f7f\u7528<code>.format()<\/code>\u65b9\u6cd5\u6216<code>f-string<\/code>\uff08Python 3.6+\uff09\uff0c\u53ef\u8f7b\u677e\u8bbe\u5b9a\u6d6e\u70b9\u6570\u7684\u5c0f\u6570\u4f4d\u6570\u3002<\/p>\n<\/p>\n<p><h4>1. <code>.format()<\/code>\u65b9\u6cd5<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">number = 123.45678<\/p>\n<p>formatted_number = &quot;{:.2f}&quot;.format(number)<\/p>\n<p>print(formatted_number)  # \u8f93\u51fa 123.46\uff0c\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2. <code>f-string<\/code>\u683c\u5f0f\u5316<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">number = 123.45678<\/p>\n<p>formatted_number = f&quot;{number:.2f}&quot;<\/p>\n<p>print(formatted_number)  # \u8f93\u51fa\u540c\u4e0a<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e8c\u3001\u5185\u5efa\u51fd\u6570round<\/h3>\n<\/p>\n<p><p><strong>\u5185\u5efa\u51fd\u6570<code>round<\/code><\/strong> \u53ef\u4ee5\u5c06\u6d6e\u70b9\u6570\u56db\u820d\u4e94\u5165\u5230\u6307\u5b9a\u7684\u5c0f\u6570\u4f4d\u6570\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">number = 123.45678<\/p>\n<p>rounded_number = round(number, 2)<\/p>\n<p>print(rounded_number)  # \u8f93\u51fa 123.46<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c<code>round<\/code>\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u4f1a\u53d7\u5230\u6d6e\u70b9\u6570\u7cbe\u5ea6\u7684\u5f71\u54cd\uff0c\u8fd9\u53ef\u80fd\u5bfc\u81f4\u4e00\u4e9b\u4e0d\u7cbe\u786e\u7684\u7ed3\u679c\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001\u6d6e\u70b9\u6570\u9664\u6cd5<\/h3>\n<\/p>\n<p><p>\u5f53\u8fdb\u884c\u9664\u6cd5\u8fd0\u7b97\u65f6\uff0c\u4f7f\u7528<code>\/<\/code>\u7b26\u53f7 \u81ea\u52a8\u5f97\u5230\u6d6e\u70b9\u6570\u7ed3\u679c\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">result = 10 \/ 3<\/p>\n<p>print(result)  # \u8f93\u51fa 3.3333333333333335<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5982\u679c\u9664\u6570\u6216\u88ab\u9664\u6570\u662f\u6d6e\u70b9\u6570\uff0c\u90a3\u4e48\u7ed3\u679c\u4e5f\u4f1a\u662f\u6d6e\u70b9\u6570\uff0c\u6b64\u65f6\u53ef\u4ee5\u7ed3\u5408\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u6216<code>round<\/code>\u51fd\u6570\u6765\u63a7\u5236\u5c0f\u6570\u4f4d\u6570\u3002<\/p>\n<\/p>\n<p><h3>\u56db\u3001\u4f7f\u7528decimal\u6a21\u5757<\/h3>\n<\/p>\n<p><p><strong><code>decimal<\/code>\u6a21\u5757<\/strong> \u63d0\u4f9b\u4e86\u4e00\u79cdDecimal\u6570\u636e\u7c7b\u578b\u7528\u4e8e\u5341\u8fdb\u5236\u6d6e\u70b9\u6570\u8fd0\u7b97\u3002\u6b64\u6a21\u5757\u7279\u522b\u9002\u7528\u4e8e\u9700\u8981\u9ad8\u7cbe\u5ea6\u6d6e\u70b9\u6570\u8fd0\u7b97\u7684\u573a\u666f\uff0c\u5982\u91d1\u878d\u8ba1\u7b97\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">from decimal import Decimal, getcontext<\/p>\n<h2><strong>\u8bbe\u7f6e\u5c0f\u6570\u7cbe\u5ea6<\/strong><\/h2>\n<p>getcontext().prec = 4<\/p>\n<p>number = Decimal(&#039;123.45678&#039;)<\/p>\n<p>print(number)  # \u8f93\u51fa 123.5\uff0c\u6839\u636e\u8bbe\u7f6e\u7684\u7cbe\u5ea6\u56db\u820d\u4e94\u5165<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e94\u3001\u6d6e\u70b9\u6570\u7684\u79d1\u5b66\u8ba1\u6570\u6cd5<\/h3>\n<\/p>\n<p><p>\u5728\u79d1\u5b66\u548c\u5de5\u7a0b\u8ba1\u7b97\u4e2d\uff0c\u5f80\u5f80\u9700\u8981\u4f7f\u7528\u5230<strong>\u79d1\u5b66\u8ba1\u6570\u6cd5<\/strong>\u6765\u8868\u793a\u6d6e\u70b9\u6570\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">number = 123.45678<\/p>\n<p>print(f&quot;{number:e}&quot;)  # \u8f93\u51fa 1.234568e+02<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u63a7\u5236\u5c0f\u6570\u4f4d\u6570\u7684\u539f\u7406\u4e5f\u53ef\u4ee5\u5e94\u7528\u5728\u79d1\u5b66\u8ba1\u6570\u6cd5\u7684\u683c\u5f0f\u5316\u4e2d\u3002<\/p>\n<\/p>\n<p><h3>\u516d\u3001\u907f\u514d\u6d6e\u70b9\u6570\u8bef\u5dee<\/h3>\n<\/p>\n<p><p>\u7531\u4e8e\u4e8c\u8fdb\u5236\u8868\u793a\u7684\u9650\u5236\uff0c\u6d6e\u70b9\u6570\u8fd0\u7b97\u53ef\u80fd\u4f1a\u5f15\u5165\u4e00\u4e9b\u4e0d\u7cbe\u786e\u7684\u9519\u8bef\u3002\u4e3a\u4e86\u5e94\u5bf9\u8fd9\u4e00\u95ee\u9898\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e9b\u7b56\u7565\uff1a<\/p>\n<\/p>\n<p><h4>1. \u7cbe\u786e\u7684\u5c0f\u6570\u7c7b\u578b<\/h4>\n<\/p>\n<p><p>\u9664\u4e86<code>decimal<\/code>\u6a21\u5757\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528<code>fractions<\/code>\u6a21\u5757\u6765\u8fdb\u884c\u7cbe\u786e\u7684\u6570\u5b66\u8ba1\u7b97\uff0c\u5b83\u8868\u793a\u6570\u5b57\u4f5c\u4e3a\u5206\u6570\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">from fractions import Fraction<\/p>\n<p>result = Fraction(1, 3)  # \u8868\u793a1\/3<\/p>\n<p>print(result)  # \u8f93\u51fa 1\/3<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2. \u6d6e\u70b9\u6570\u7684\u6bd4\u8f83<\/h4>\n<\/p>\n<p><p>\u6bd4\u8f83\u6d6e\u70b9\u6570\u65f6\uff0c\u4f7f\u7528\u8fd1\u4f3c\u503c\u800c\u975e\u76f4\u63a5\u7b49\u4e8e\u7684\u65b9\u5f0f\u6765\u907f\u514d\u7cbe\u5ea6\u95ee\u9898\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">a = 0.1 + 0.1 + 0.1<\/p>\n<p>b = 0.3<\/p>\n<p>print(abs(a - b) &lt; 1e-10)  # \u4f7f\u7528\u5bb9\u5dee\u5224\u65ada\u548cb\u662f\u5426\u8db3\u591f\u63a5\u8fd1<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u603b\u7ed3<\/h3>\n<\/p>\n<p><p>\u5728Python\u4e2d\u4f7f\u8ba1\u7b97\u7ed3\u679c\u663e\u793a\u5c0f\u6570\uff0c\u6709\u591a\u79cd\u65b9\u6cd5\u53ef\u4f9b\u9009\u62e9\u3002\u6839\u636e\u5177\u4f53\u9700\u6c42\u7684\u4e0d\u540c\uff0c\u53ef\u4ee5\u9009\u62e9\u6700\u9002\u5408\u7684\u65b9\u6cd5\u4ee5\u83b7\u53d6\u671f\u671b\u7684\u7cbe\u5ea6\u548c\u683c\u5f0f\u3002\u5bf9\u4e8e\u5927\u591a\u6570\u573a\u5408\uff0c\u7b80\u5355\u7684\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u6216<code>round<\/code>\u51fd\u6570\u8db3\u591f\u4f7f\u7528\u3002\u5bf9\u4e8e\u6d89\u53ca\u5230\u91d1\u878d\u6216\u8005\u9700\u8981\u9ad8\u7cbe\u5ea6\u7684\u79d1\u5b66\u8ba1\u7b97\u60c5\u51b5\uff0c<code>decimal<\/code>\u6a21\u5757\u63d0\u4f9b\u4e86\u66f4\u4e13\u4e1a\u7684\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>1. \u5982\u4f55\u8ba9Python\u8ba1\u7b97\u7ed3\u679c\u663e\u793a\u5c0f\u6570\uff1f<\/strong><\/p>\n<p>\u5982\u679c\u4f60\u5e0c\u671bPython\u8ba1\u7b97\u7684\u7ed3\u679c\u663e\u793a\u4e3a\u5c0f\u6570\u800c\u975e\u6574\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528\u6d6e\u70b9\u6570\u8fdb\u884c\u8fd0\u7b97\u3002\u5728\u8fdb\u884c\u6570\u5b66\u8fd0\u7b97\u65f6\uff0c\u53ea\u9700\u786e\u4fdd\u81f3\u5c11\u4e00\u4e2a\u64cd\u4f5c\u6570\u4e3a\u6d6e\u70b9\u6570\uff0cPython\u5c31\u4f1a\u81ea\u52a8\u8fd4\u56de\u4e00\u4e2a\u5c0f\u6570\u7ed3\u679c\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre><code class=\"language-python\">x = 7\ny = 2\n\nresult = x \/ y\nprint(result)  # \u8f93\u51fa\u7ed3\u679c\u4e3a3.5\uff0c\u800c\u975e3\n<\/code><\/pre>\n<p><strong>2. \u5982\u4f55\u63a7\u5236Python\u8ba1\u7b97\u7ed3\u679c\u5c0f\u6570\u7684\u4f4d\u6570\uff1f<\/strong><\/p>\n<p>\u5982\u679c\u4f60\u60f3\u8ba9Python\u8ba1\u7b97\u7ed3\u679c\u5c0f\u6570\u53ea\u663e\u793a\u7279\u5b9a\u7684\u4f4d\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u3002\u5728\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u4e2d\u4f7f\u7528<code>%<\/code>\u64cd\u4f5c\u7b26\u548c\u4e00\u4e2a\u6570\u5b57\uff0c\u8868\u793a\u4fdd\u7559\u7684\u5c0f\u6570\u4f4d\u6570\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u60f3\u4fdd\u7559\u7ed3\u679c\u5c0f\u6570\u70b9\u540e\u4e24\u4f4d\uff0c\u53ef\u4ee5\u8fd9\u6837\u505a\uff1a<\/p>\n<pre><code class=\"language-python\">x = 7\ny = 2\n\nresult = x \/ y\nformatted_result = &quot;%.2f&quot; % result\nprint(formatted_result)  # \u8f93\u51fa\u7ed3\u679c\u4e3a3.50\n<\/code><\/pre>\n<p>\u8fd9\u5c06\u628a\u7ed3\u679c\u683c\u5f0f\u5316\u4e3a\u5c0f\u6570\u70b9\u540e\u4e24\u4f4d\uff0c\u5373\u4fbf\u7ed3\u679c\u6ca1\u6709\u8fd9\u4e48\u591a\u4f4d\u6570\u3002<\/p>\n<p><strong>3. \u5982\u4f55\u56db\u820d\u4e94\u5165Python\u8ba1\u7b97\u7ed3\u679c\u7684\u5c0f\u6570\u4f4d\u6570\uff1f<\/strong><\/p>\n<p>\u5982\u679c\u4f60\u5e0c\u671b\u56db\u820d\u4e94\u5165Python\u8ba1\u7b97\u7ed3\u679c\u7684\u5c0f\u6570\u4f4d\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528\u5185\u7f6e\u7684<code>round<\/code>\u51fd\u6570\u3002\u8fd9\u4e2a\u51fd\u6570\u91c7\u7528\u4e24\u4e2a\u53c2\u6570\uff1a\u8981\u8fdb\u884c\u56db\u820d\u4e94\u5165\u7684\u503c\u548c\u4fdd\u7559\u7684\u5c0f\u6570\u4f4d\u6570\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre><code class=\"language-python\">x = 7\ny = 2\n\nresult = x \/ y\nrounded_result = round(result, 2)\nprint(rounded_result)  # \u8f93\u51fa\u7ed3\u679c\u4e3a3.5\n<\/code><\/pre>\n<p><code>round<\/code>\u51fd\u6570\u5c06\u7ed3\u679c\u56db\u820d\u4e94\u5165\u5230\u6307\u5b9a\u7684\u5c0f\u6570\u4f4d\u6570\uff0c\u4fdd\u7559\u7684\u4f4d\u6570\u53d6\u51b3\u4e8e\u7b2c\u4e8c\u4e2a\u53c2\u6570\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u900f\u8fc7\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u3001\u4f7f\u7528\u5185\u5efa\u51fd\u6570round\u3001\u6d6e\u70b9\u6570\u9664\u6cd5\u6216\u8005\u5bfc\u5165\u4e13\u95e8\u7684\u6570\u5b66\u5e93\u5982decimal [&hellip;]","protected":false},"author":3,"featured_media":178217,"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\/178205"}],"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=178205"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/178205\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/178217"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=178205"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=178205"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=178205"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}