{"id":176219,"date":"2024-05-08T19:06:28","date_gmt":"2024-05-08T11:06:28","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/176219.html"},"modified":"2024-05-08T19:06:31","modified_gmt":"2024-05-08T11:06:31","slug":"python%e6%80%8e%e4%b9%88%e8%a7%a3%e5%86%b3%e4%b8%8d%e7%a1%ae%e5%ae%9a%e5%b0%be%e6%95%b0","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/176219.html","title":{"rendered":"python\u600e\u4e48\u89e3\u51b3\u4e0d\u786e\u5b9a\u5c3e\u6570"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/27055803\/381984a3-f344-4296-ad3b-1c9406a0825c.webp\" alt=\"python\u600e\u4e48\u89e3\u51b3\u4e0d\u786e\u5b9a\u5c3e\u6570\" \/><\/p>\n<p><p><strong>Python\u89e3\u51b3\u4e0d\u786e\u5b9a\u5c3e\u6570\u7684\u5e38\u7528\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528decimal\u6a21\u5757\u8fdb\u884c\u7cbe\u786e\u5c0f\u6570\u8ba1\u7b97\u3001\u4f7f\u7528\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u6765\u63a7\u5236\u8f93\u51fa\u7cbe\u5ea6\u3001\u4f7f\u7528\u5185\u7f6e\u51fd\u6570round\u6765\u56db\u820d\u4e94\u5165<\/strong>\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u4e0d\u786e\u5b9a\u5c3e\u6570\u95ee\u9898\u6765\u6e90\u4e8e\u6d6e\u70b9\u6570\u7684\u4e8c\u8fdb\u5236\u8868\u793a\uff0c\u5bfc\u81f4\u7cbe\u786e\u7684\u5341\u8fdb\u5236\u6d6e\u70b9\u6570\u5728\u8ba1\u7b97\u673a\u4e2d\u65e0\u6cd5\u7cbe\u786e\u8868\u793a\u3002\u5728\u8fdb\u884c\u7cbe\u786e\u8ba1\u7b97\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528Python\u6807\u51c6\u5e93\u4e2d\u7684decimal\u6a21\u5757\uff0c\u63d0\u4f9b\u4e86Decimal\u7c7b\u6765\u652f\u6301\u5341\u8fdb\u5236\u6d6e\u70b9\u8fd0\u7b97\uff0c\u4ece\u800c\u89e3\u51b3\u6d6e\u70b9\u6570\u4e0d\u786e\u5b9a\u5c3e\u6570\u7684\u95ee\u9898\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u4f7f\u7528DECIMAL\u6a21\u5757\u5904\u7406\u4e0d\u786e\u5b9a\u5c3e\u6570<\/h3>\n<\/p>\n<p><p>Python\u7684decimal\u6a21\u5757\u63d0\u4f9b\u4e86\u4e00\u4e2aDecimal\u6570\u636e\u7c7b\u578b\u7528\u4e8e\u5341\u8fdb\u5236\u6570\u5b66\u8fd0\u7b97\u3002\u5b83\u5e2e\u52a9\u4fee\u590d\u4e86\u4e8c\u8fdb\u5236\u6d6e\u70b9\u6570\u5e38\u89c1\u7684\u7cbe\u5ea6\u95ee\u9898\u3002<\/p>\n<\/p>\n<p><h4>\u83b7\u53d6\u7cbe\u51c6\u7684\u5341\u8fdb\u5236\u8868\u793a<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">from decimal import Decimal<\/p>\n<h2><strong>\u4f7f\u7528Decimal\u6765\u76f4\u63a5\u8868\u793a\u5c0f\u6570\u800c\u4e0d\u662f\u4e8c\u8fdb\u5236\u6d6e\u70b9\u6570<\/strong><\/h2>\n<p>precise_number = Decimal(&#039;0.1&#039;)<\/p>\n<p>print(precise_number)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>\u81ea\u5b9a\u4e49\u6570\u503c\u4e0a\u4e0b\u6587<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">from decimal import Decimal, getcontext<\/p>\n<h2><strong>\u8bbe\u7f6e\u5168\u5c40\u7684\u7cbe\u5ea6\u4e3a4\u4f4d<\/strong><\/h2>\n<p>getcontext().prec = 4<\/p>\n<p>precise_result = Decimal(&#039;0.12345&#039;) + Decimal(&#039;0.12345&#039;)<\/p>\n<p>print(precise_result)  # \u8f93\u51fa\u7cbe\u5ea6\u4e3a4\u4f4d\u7684\u7ed3\u679c<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e8c\u3001\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u63a7\u5236\u8f93\u51fa\u7cbe\u5ea6<\/h3>\n<\/p>\n<p><p>\u5b57\u7b26\u4e32\u7684\u683c\u5f0f\u5316\u65b9\u6cd5\u53ef\u4ee5\u88ab\u7528\u4e8e\u9650\u5b9a\u6d6e\u70b9\u6570\u7684\u8f93\u51fa\u7cbe\u5ea6\uff0c\u4ece\u800c\u907f\u514d\u663e\u793a\u591a\u4f59\u7684\u4e0d\u786e\u5b9a\u5c3e\u6570\u3002<\/p>\n<\/p>\n<p><h4>\u683c\u5f0f\u5316\u8f93\u51fa\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528<code>str.format()<\/code><\/h4>\n<\/p>\n<p><pre><code class=\"language-python\"># \u4fdd\u7559\u5c0f\u6570\u70b9\u540e\u4e24\u4f4d\u5c0f\u6570<\/p>\n<p>formatted_number = &quot;{:.2f}&quot;.format(3.14159)<\/p>\n<p>print(formatted_number)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>\u683c\u5f0f\u5316\u8f93\u51fa\u65b9\u6cd5\u4e8c\uff1af-strings\uff08Python 3.6+\uff09<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\"># \u4fdd\u7559\u5c0f\u6570\u70b9\u540e\u4e09\u4f4d\u5c0f\u6570<\/p>\n<p>formatted_number = f&quot;{3.14159:.3f}&quot;<\/p>\n<p>print(formatted_number)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e09\u3001\u5185\u7f6e\u51fd\u6570ROUND\u8fdb\u884c\u56db\u820d\u4e94\u5165<\/h3>\n<\/p>\n<p><p>\u4f7f\u7528round()\u51fd\u6570\u53ef\u4ee5\u5c06\u6d6e\u70b9\u6570\u56db\u820d\u4e94\u5165\u5230\u7ed9\u5b9a\u7684\u7cbe\u5ea6\u3002\u8fd9\u4e2a\u65b9\u6cd5\u53ef\u4ee5\u6d88\u9664\u4f4e\u4f4d\u7684\u4e0d\u786e\u5b9a\u5c3e\u6570\u3002<\/p>\n<\/p>\n<p><h4>\u57fa\u672c\u7684\u56db\u820d\u4e94\u5165\u64cd\u4f5c<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">rounded_number = round(3.14159, 2)  # \u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570<\/p>\n<p>print(rounded_number)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>\u7279\u6b8a\u573a\u666f\u4e0b\u7684\u6ce8\u610f\u70b9<\/h4>\n<\/p>\n<p><p>\u56db\u820d\u4e94\u5165\u7684\u5904\u7406\u4f7f\u7528\u7684\u662f\u94f6\u884c\u5bb6\u820d\u5165\u7b97\u6cd5\uff0c\u5373\u82e5\u8981\u820d\u5f03\u7684\u6570\u503c\u6070\u597d\u662f5\u5e76\u4e14\u4e4b\u540e\u6ca1\u6709\u5176\u4ed6\u6570\u5b57\uff08\u6216\u5168\u4e3a\u96f6\uff09\uff0c\u5219\u5411\u6700\u63a5\u8fd1\u7684\u5076\u6570\u820d\u5165\u3002<\/p>\n<\/p>\n<p><h4>\u7ec4\u5408\u4f7f\u7528<\/h4>\n<\/p>\n<p><p>\u4e3a\u4e86\u89e3\u51b3\u4e0d\u786e\u5b9a\u5c3e\u6570\u7684\u95ee\u9898\uff0c\u7ecf\u5e38\u4f1a\u5c06round\u51fd\u6570\u548cdecimal\u6a21\u5757\u7ed3\u5408\u4f7f\u7528\uff0c\u5148\u4f7f\u7528decimal\u786e\u4fdd\u6570\u5b66\u8ba1\u7b97\u7684\u7cbe\u786e\u6027\uff0c\u7136\u540e\u7528round\u51fd\u6570\u5bf9\u7528\u6237\u663e\u793a\u7684\u5185\u5bb9\u8fdb\u884c\u683c\u5f0f\u5316\u3002<\/p>\n<\/p>\n<p><h3>\u56db\u3001\u5176\u4ed6\u6ce8\u610f\u4e8b\u9879<\/h3>\n<\/p>\n<p><p>\u5728\u89e3\u51b3\u4e0d\u786e\u5b9a\u5c3e\u6570\u95ee\u9898\u65f6\uff0c\u8fd8\u9700\u8981\u8003\u8651\u5230\u6d6e\u70b9\u6570\u7684\u6bd4\u8f83\u3001\u6d6e\u70b9\u6570\u8fd0\u7b97\u7684\u7cbe\u5ea6\u63a7\u5236\u4ee5\u53ca\u6d6e\u70b9\u6570\u5728\u5b58\u50a8\u548c\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u7684\u5904\u7406\u7b49\u591a\u4e2a\u65b9\u9762\u3002<\/p>\n<\/p>\n<p><h4>\u6d6e\u70b9\u6570\u7684\u6bd4\u8f83<\/h4>\n<\/p>\n<p><p>\u5728\u8fdb\u884c\u6d6e\u70b9\u6570\u6bd4\u8f83\u65f6\uff0c\u907f\u514d\u76f4\u63a5\u4f7f\u7528\u7b49\u53f7\uff08==\uff09\u6765\u5224\u65ad\u4e24\u4e2a\u6d6e\u70b9\u6570\u662f\u5426\u76f8\u7b49\uff0c\u5e94\u8be5\u5224\u65ad\u5b83\u4eec\u4e4b\u5dee\u7684\u7edd\u5bf9\u503c\u662f\u5426\u5c0f\u4e8e\u4e00\u4e2a\u8db3\u591f\u5c0f\u7684\u9608\u503c\u3002<\/p>\n<\/p>\n<p><h4>\u7cbe\u5ea6\u63a7\u5236\u4e0e\u8ba1\u7b97<\/h4>\n<\/p>\n<p><p>\u5728\u590d\u6742\u7684\u6570\u5b66\u8ba1\u7b97\u4e2d\uff0c\u5e94\u5f53\u5168\u7a0b\u91c7\u7528Decimal\u7c7b\u578b\u8fdb\u884c\u64cd\u4f5c\uff0c\u4ee5\u907f\u514d\u4e2d\u95f4\u7ed3\u679c\u4ea7\u751f\u8bef\u5dee\u3002<\/p>\n<\/p>\n<p><h4>\u6570\u636e\u5b58\u50a8\u4e0e\u4f20\u8f93<\/h4>\n<\/p>\n<p><p>\u5728\u5c06\u6d6e\u70b9\u6570\u5b58\u50a8\u5230\u6587\u4ef6\u6216\u8fdb\u884c\u7f51\u7edc\u4f20\u8f93\u65f6\uff0c\u8003\u8651\u4f7f\u7528\u5b57\u7b26\u4e32\u683c\u5f0f\u6216\u8005\u786e\u4fdd\u53e6\u4e00\u7aef\u6062\u590d\u6570\u636e\u65f6\u91c7\u7528\u540c\u7b49\u7cbe\u5ea6\u3002<\/p>\n<\/p>\n<p><p>\u603b\u7ed3\u8d77\u6765\uff0c<strong>Python\u901a\u8fc7decimal\u6a21\u5757\u3001\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u548cround\u51fd\u6570<\/strong>\uff0c\u63d0\u4f9b\u4e86\u591a\u79cd\u65b9\u5f0f\u6765\u89e3\u5191\u4e8e\u6d6e\u70b9\u6570\u7684\u4e0d\u786e\u5b9a\u5c3e\u6570\u95ee\u9898\u3002\u5728\u5177\u4f53\u5e94\u7528\u4e2d\uff0c\u5e94\u7ed3\u5408\u5b9e\u9645\u60c5\u51b5\u9009\u62e9\u5408\u9002\u7684\u89e3\u51b3\u65b9\u6848\uff0c\u5e76\u6ce8\u610f\u5168\u9762\u8003\u8651\u6d6e\u70b9\u6570\u5728\u8fd0\u7b97\u548c\u4f7f\u7528\u4e2d\u53ef\u80fd\u9047\u5230\u7684\u5176\u4ed6\u95ee\u9898\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>\u95ee\u98981\uff1aPython\u4e2d\u5982\u4f55\u5904\u7406\u5e26\u6709\u4e0d\u786e\u5b9a\u5c3e\u6570\u7684\u8ba1\u7b97\u6216\u6d6e\u70b9\u6570\u95ee\u9898\uff1f<\/strong><\/p>\n<p>\u56de\u7b541\uff1aPython\u63d0\u4f9b\u4e86\u4e00\u4e9b\u65b9\u6cd5\u6765\u5904\u7406\u4e0d\u786e\u5b9a\u5c3e\u6570\u95ee\u9898\u3002\u9996\u5148\uff0c\u53ef\u4ee5\u4f7f\u7528\u56db\u820d\u4e94\u5165\u51fd\u6570round()\u6765\u5c06\u6d6e\u70b9\u6570\u56db\u820d\u4e94\u5165\u5230\u6307\u5b9a\u7684\u5c0f\u6570\u4f4d\u6570\u3002\u4f8b\u5982\uff0c\u8981\u5c06\u4e00\u4e2a\u6d6e\u70b9\u6570\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528round(number, 2)\u3002\u5176\u6b21\uff0c\u53ef\u4ee5\u4f7f\u7528math\u6a21\u5757\u4e2d\u7684\u51fd\u6570\u6765\u6267\u884c\u66f4\u590d\u6742\u7684\u820d\u5165\u64cd\u4f5c\uff0c\u5982\u5411\u4e0a\u53d6\u6574\uff08math.ceil()\uff09\u548c\u5411\u4e0b\u53d6\u6574\uff08math.floor()\uff09\u3002\u6700\u540e\uff0c\u5982\u679c\u9700\u8981\u8fdb\u884c\u6570\u503c\u6bd4\u8f83\uff0c\u5e94\u8be5\u4f7f\u7528math\u6a21\u5757\u4e2d\u7684isclose()\u51fd\u6570\uff0c\u800c\u4e0d\u662f\u76f4\u63a5\u4f7f\u7528\u7b49\u53f7\u8fdb\u884c\u6bd4\u8f83\uff0c\u56e0\u4e3a\u6d6e\u70b9\u6570\u8ba1\u7b97\u5b58\u5728\u7cbe\u5ea6\u95ee\u9898\u3002<\/p>\n<p><strong>\u95ee\u98982\uff1aPython\u4e2d\u5982\u4f55\u5904\u7406\u4e0d\u786e\u5b9a\u5c3e\u6570\u95ee\u9898\uff0c\u4ee5\u907f\u514d\u7cbe\u5ea6\u635f\u5931\uff1f<\/strong><\/p>\n<p>\u56de\u7b542\uff1a\u5f53\u8fdb\u884c\u6d6e\u70b9\u6570\u8ba1\u7b97\u65f6\uff0cPython\u53ef\u80fd\u4f1a\u5bfc\u81f4\u7cbe\u5ea6\u635f\u5931\uff0c\u56e0\u4e3a\u6d6e\u70b9\u6570\u7684\u8868\u793a\u65b9\u5f0f\u662f\u8fd1\u4f3c\u7684\u3002\u4e3a\u4e86\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u53ef\u4ee5\u4f7f\u7528Decimal\u6a21\u5757\uff0c\u5b83\u63d0\u4f9b\u4e86\u66f4\u9ad8\u7684\u7cbe\u5ea6\u3002\u53ef\u4ee5\u4f7f\u7528Decimal\u7c7b\u6765\u8868\u793a\u6d6e\u70b9\u6570\uff0c\u5e76\u4f7f\u7528\u76f8\u5173\u7684\u65b9\u6cd5\u6267\u884c\u52a0\u6cd5\u3001\u51cf\u6cd5\u3001\u4e58\u6cd5\u548c\u9664\u6cd5\u7b49\u64cd\u4f5c\u3002\u540c\u65f6\uff0cDecimal\u7c7b\u8fd8\u63d0\u4f9b\u4e86\u65b9\u6cd5\u6765\u8bbe\u7f6e\u8f93\u51fa\u7cbe\u5ea6\u4ee5\u53ca\u63a7\u5236\u820d\u5165\u884c\u4e3a\uff0c\u4ee5\u786e\u4fdd\u8ba1\u7b97\u7ed3\u679c\u7684\u51c6\u786e\u6027\u3002<\/p>\n<p><strong>\u95ee\u98983\uff1a\u5982\u4f55\u5728Python\u4e2d\u8fdb\u884c\u8d27\u5e01\u8ba1\u7b97\uff0c\u4ee5\u907f\u514d\u4e0d\u786e\u5b9a\u5c3e\u6570\u95ee\u9898\uff1f<\/strong><\/p>\n<p>\u56de\u7b543\uff1a\u5728\u8fdb\u884c\u8d27\u5e01\u8ba1\u7b97\u65f6\uff0c\u5c24\u5176\u9700\u8981\u6ce8\u610f\u4e0d\u786e\u5b9a\u5c3e\u6570\u95ee\u9898\uff0c\u4ee5\u907f\u514d\u4ea7\u751f\u9519\u8bef\u7684\u8ba1\u7b97\u7ed3\u679c\u3002\u4e3a\u4e86\u5904\u7406\u8fd9\u79cd\u60c5\u51b5\uff0c\u53ef\u4ee5\u4f7f\u7528Python\u7684decimal\u6a21\u5757\u3002\u9996\u5148\uff0c\u4f7f\u7528Decimal\u7c7b\u6765\u8868\u793a\u8d27\u5e01\u91d1\u989d\uff0c\u907f\u514d\u4f7f\u7528\u6d6e\u70b9\u6570\u3002\u5176\u6b21\uff0c\u4f7f\u7528quantize()\u65b9\u6cd5\u6765\u5c06\u8ba1\u7b97\u7ed3\u679c\u820d\u5165\u5230\u6307\u5b9a\u7684\u5c0f\u6570\u4f4d\u6570\uff0c\u4ee5\u4fdd\u6301\u7cbe\u5ea6\u3002\u8fd8\u53ef\u4ee5\u4f7f\u7528decimal\u6a21\u5757\u4e2d\u7684\u5176\u5b83\u51fd\u6570\u6765\u6267\u884c\u52a0\u6cd5\u3001\u51cf\u6cd5\u3001\u4e58\u6cd5\u548c\u9664\u6cd5\u7b49\u8ba1\u7b97\u64cd\u4f5c\uff0c\u5e76\u6b63\u786e\u5904\u7406\u4e0d\u786e\u5b9a\u5c3e\u6570\u95ee\u9898\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Python\u89e3\u51b3\u4e0d\u786e\u5b9a\u5c3e\u6570\u7684\u5e38\u7528\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528decimal\u6a21\u5757\u8fdb\u884c\u7cbe\u786e\u5c0f\u6570\u8ba1\u7b97\u3001\u4f7f\u7528\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u6765\u63a7\u5236\u8f93\u51fa\u7cbe\u5ea6 [&hellip;]","protected":false},"author":3,"featured_media":176220,"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\/176219"}],"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=176219"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/176219\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/176220"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=176219"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=176219"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=176219"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}