{"id":1139489,"date":"2025-01-08T22:10:43","date_gmt":"2025-01-08T14:10:43","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1139489.html"},"modified":"2025-01-08T22:10:46","modified_gmt":"2025-01-08T14:10:46","slug":"python%e5%a6%82%e4%bd%95%e6%af%94%e8%be%83%e4%b8%a4%e4%b8%aa%e6%b5%ae%e7%82%b9%e6%95%b0%e6%98%af%e5%90%a6%e7%9b%b8%e7%ad%89","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1139489.html","title":{"rendered":"python\u5982\u4f55\u6bd4\u8f83\u4e24\u4e2a\u6d6e\u70b9\u6570\u662f\u5426\u76f8\u7b49"},"content":{"rendered":"

\"python\u5982\u4f55\u6bd4\u8f83\u4e24\u4e2a\u6d6e\u70b9\u6570\u662f\u5426\u76f8\u7b49\"<\/p>\n

Python\u5982\u4f55\u6bd4\u8f83\u4e24\u4e2a\u6d6e\u70b9\u6570\u662f\u5426\u76f8\u7b49\uff1a\u4f7f\u7528\u8bef\u5dee\u8303\u56f4\u3001\u4f7f\u7528math.isclose()\u51fd\u6570\u3001\u4f7f\u7528numpy.allclose()\u51fd\u6570\u3001\u76f4\u63a5\u6bd4\u8f83\u3001\u5c06\u6d6e\u70b9\u6570\u8f6c\u6362\u4e3a\u6574\u6570\u3002<\/strong> \u5176\u4e2d\uff0c\u4f7f\u7528\u8bef\u5dee\u8303\u56f4<\/strong>\u7684\u65b9\u6cd5\u662f\u6700\u5e38\u89c1\u548c\u63a8\u8350\u7684\uff0c\u56e0\u4e3a\u6d6e\u70b9\u6570\u5728\u8ba1\u7b97\u673a\u4e2d\u5b58\u50a8\u65f6\u53ef\u80fd\u4f1a\u51fa\u73b0\u7cbe\u5ea6\u635f\u5931\uff0c\u76f4\u63a5\u6bd4\u8f83\u4e24\u4e2a\u6d6e\u70b9\u6570\u662f\u5426\u76f8\u7b49\u5e38\u5e38\u4f1a\u5bfc\u81f4\u610f\u60f3\u4e0d\u5230\u7684\u7ed3\u679c\u3002\u4f7f\u7528\u8bef\u5dee\u8303\u56f4\u8fdb\u884c\u6bd4\u8f83\u53ef\u4ee5\u6709\u6548\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\u3002<\/p>\n<\/p>\n

\u4e3a\u4e86\u8be6\u7ec6\u89e3\u91ca\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e2a\u5f88\u5c0f\u7684\u503c\uff08\u5982epsilon\uff09\u4f5c\u4e3a\u8bef\u5dee\u8303\u56f4\uff0c\u6765\u5224\u65ad\u4e24\u4e2a\u6d6e\u70b9\u6570\u662f\u5426\u76f8\u7b49\u3002\u6bd4\u5982\u5728Python\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u8fd9\u6837\u5b9e\u73b0\uff1a<\/p>\n<\/p>\n

epsilon = 1e-10<\/p>\n
if abs(a - b) < epsilon:<\/p>\n
    print("a and b are equal")<\/p>\n
else:<\/p>\n
    print("a and b are not equal")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5f88\u5c0f\u7684\u503cepsilon\uff081e-10\uff09\uff0c\u5e76\u901a\u8fc7\u8ba1\u7b97\u4e24\u4e2a\u6d6e\u70b9\u6570a\u548cb\u7684\u5dee\u7684\u7edd\u5bf9\u503c\u662f\u5426\u5c0f\u4e8eepsilon\u6765\u5224\u65ad\u5b83\u4eec\u662f\u5426\u76f8\u7b49\u3002\u8fd9\u6837\u7684\u65b9\u6cd5\u53ef\u4ee5\u6709\u6548\u5730\u5904\u7406\u6d6e\u70b9\u6570\u7cbe\u5ea6\u95ee\u9898\u3002<\/p>\n<\/p>\n
\u4e00\u3001\u4f7f\u7528\u8bef\u5dee\u8303\u56f4<\/h3>\n<\/p>\n
1.1 \u5b9a\u4e49\u8bef\u5dee\u8303\u56f4<\/h4>\n<\/p>\n
\u4f7f\u7528\u8bef\u5dee\u8303\u56f4\u662f\u6bd4\u8f83\u4e24\u4e2a\u6d6e\u70b9\u6570\u662f\u5426\u76f8\u7b49\u7684\u5e38\u89c1\u65b9\u6cd5\u3002\u5728\u8ba1\u7b97\u673a\u4e2d\uff0c\u6d6e\u70b9\u6570\u7684\u8868\u793a\u5b58\u5728\u4e00\u5b9a\u7684\u8bef\u5dee\uff0c\u56e0\u6b64\u76f4\u63a5\u6bd4\u8f83\u4e24\u4e2a\u6d6e\u70b9\u6570\u662f\u5426\u76f8\u7b49\u5f80\u5f80\u4e0d\u53ef\u9760\u3002\u4e3a\u4e86\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9a\u4e49\u4e00\u4e2a\u5f88\u5c0f\u7684\u8bef\u5dee\u8303\u56f4epsilon\uff0c\u5f53\u4e24\u4e2a\u6d6e\u70b9\u6570\u7684\u5dee\u7684\u7edd\u5bf9\u503c\u5c0f\u4e8e\u8fd9\u4e2a\u8bef\u5dee\u8303\u56f4\u65f6\uff0c\u6211\u4eec\u8ba4\u4e3a\u5b83\u4eec\u662f\u76f8\u7b49\u7684\u3002<\/p>\n<\/p>\n
\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
epsilon = 1e-10<\/p>\n
a = 0.123456789<\/p>\n
b = 0.123456788<\/p>\n
if abs(a - b) < epsilon:<\/p>\n
    print("a and b are equal")<\/p>\n
else:<\/p>\n
    print("a and b are not equal")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0ca\u548cb\u7684\u503c\u975e\u5e38\u63a5\u8fd1\uff0c\u4f46\u7531\u4e8e\u6d6e\u70b9\u6570\u8868\u793a\u7684\u8bef\u5dee\uff0c\u5b83\u4eec\u5e76\u4e0d\u5b8c\u5168\u76f8\u7b49\u3002\u901a\u8fc7\u4f7f\u7528\u8bef\u5dee\u8303\u56f4epsilon\uff0c\u6211\u4eec\u53ef\u4ee5\u5224\u65ad\u5b83\u4eec\u5728\u4e00\u5b9a\u7684\u7cbe\u5ea6\u8303\u56f4\u5185\u662f\u76f8\u7b49\u7684\u3002<\/p>\n<\/p>\n
1.2 \u9009\u62e9\u5408\u9002\u7684epsilon\u503c<\/h4>\n<\/p>\n
\u9009\u62e9\u5408\u9002\u7684epsilon\u503c\u662f\u4f7f\u7528\u8bef\u5dee\u8303\u56f4\u6bd4\u8f83\u6d6e\u70b9\u6570\u7684\u5173\u952e\u3002\u901a\u5e38\uff0cepsilon\u7684\u503c\u5e94\u5f53\u8db3\u591f\u5c0f\uff0c\u4ee5\u786e\u4fdd\u6bd4\u8f83\u7684\u7cbe\u5ea6\uff0c\u4f46\u4e5f\u4e0d\u5e94\u8be5\u592a\u5c0f\uff0c\u4ee5\u907f\u514d\u8bef\u5dee\u8303\u56f4\u8fc7\u4e8e\u4e25\u683c\u3002<\/p>\n<\/p>\n
\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u9009\u62e9epsilon\u503c\u65f6\u9700\u8981\u8003\u8651\u5177\u4f53\u7684\u573a\u666f\u548c\u9700\u6c42\u3002\u4f8b\u5982\uff0c\u5728\u79d1\u5b66\u8ba1\u7b97\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u66f4\u9ad8\u7684\u7cbe\u5ea6\uff0c\u56e0\u6b64epsilon\u503c\u5e94\u5f53\u8bbe\u5f97\u66f4\u5c0f\uff1b\u800c\u5728\u4e00\u4e9b\u65e5\u5e38\u5e94\u7528\u4e2d\uff0c\u8f83\u5927\u7684epsilon\u503c\u53ef\u80fd\u5df2\u7ecf\u8db3\u591f\u4e86\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528math.isclose()\u51fd\u6570<\/h3>\n<\/p>\n
2.1 \u57fa\u672c\u7528\u6cd5<\/h4>\n<\/p>\n
Python\u7684\u6807\u51c6\u5e93math\u6a21\u5757\u63d0\u4f9b\u4e86\u4e00\u4e2a\u540d\u4e3aisclose()\u7684\u51fd\u6570\uff0c\u53ef\u4ee5\u7528\u4e8e\u6bd4\u8f83\u4e24\u4e2a\u6d6e\u70b9\u6570\u662f\u5426\u5728\u4e00\u5b9a\u7684\u8bef\u5dee\u8303\u56f4\u5185\u76f8\u7b49\u3002\u8fd9\u4e2a\u51fd\u6570\u53ef\u4ee5\u8ba9\u6211\u4eec\u66f4\u65b9\u4fbf\u5730\u8fdb\u884c\u6d6e\u70b9\u6570\u6bd4\u8f83\uff0c\u800c\u4e0d\u9700\u8981\u624b\u52a8\u5b9a\u4e49\u548c\u8ba1\u7b97\u8bef\u5dee\u8303\u56f4\u3002<\/p>\n<\/p>\n
\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
import math<\/p>\n
a = 0.123456789<\/p>\n
b = 0.123456788<\/p>\n
if math.isclose(a, b, rel_tol=1e-9):<\/p>\n
    print("a and b are equal")<\/p>\n
else:<\/p>\n
    print("a and b are not equal")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u4e86math.isclose()\u51fd\u6570\u6765\u6bd4\u8f83a\u548cb\u662f\u5426\u76f8\u7b49\uff0c\u5e76\u8bbe\u5b9a\u4e86\u76f8\u5bf9\u8bef\u5dee\u8303\u56f4rel_tol\u4e3a1e-9\u3002math.isclose()\u51fd\u6570\u8fd8\u53ef\u4ee5\u63a5\u53d7\u4e00\u4e2a\u7edd\u5bf9\u8bef\u5dee\u8303\u56f4abs_tol\u53c2\u6570\uff0c\u4ee5\u8fdb\u4e00\u6b65\u63d0\u9ad8\u6bd4\u8f83\u7684\u7075\u6d3b\u6027\u3002<\/p>\n<\/p>\n
2.2 \u53c2\u6570\u89e3\u91ca<\/h4>\n<\/p>\n
math.isclose()\u51fd\u6570\u6709\u4e24\u4e2a\u4e3b\u8981\u53c2\u6570\uff1arel_tol\u548cabs_tol\u3002rel_tol\u8868\u793a\u76f8\u5bf9\u8bef\u5dee\u8303\u56f4\uff0c\u800cabs_tol\u8868\u793a\u7edd\u5bf9\u8bef\u5dee\u8303\u56f4\u3002\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u7684\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u53c2\u6570\u503c\uff0c\u4ee5\u786e\u4fdd\u6bd4\u8f83\u7684\u7cbe\u5ea6\u3002<\/p>\n<\/p>\n
    \n
  • \n
    rel_tol<\/strong>\uff1a\u76f8\u5bf9\u8bef\u5dee\u8303\u56f4\uff0c\u8868\u793a\u4e24\u4e2a\u6d6e\u70b9\u6570\u7684\u5dee\u5360\u5176\u4e2d\u4e00\u4e2a\u6570\u503c\u7684\u6bd4\u4f8b\u3002\u901a\u5e38\u7528\u4e8e\u6bd4\u8f83\u6570\u503c\u8f83\u5927\u7684\u6d6e\u70b9\u6570\u3002<\/p>\n<\/p>\n<\/li>\n
  • \n
    abs_tol<\/strong>\uff1a\u7edd\u5bf9\u8bef\u5dee\u8303\u56f4\uff0c\u8868\u793a\u4e24\u4e2a\u6d6e\u70b9\u6570\u7684\u5dee\u7684\u7edd\u5bf9\u503c\u3002\u901a\u5e38\u7528\u4e8e\u6bd4\u8f83\u6570\u503c\u8f83\u5c0f\u7684\u6d6e\u70b9\u6570\u3002<\/p>\n<\/p>\n<\/li>\n<\/ul>\n
    \u4f7f\u7528math.isclose()\u51fd\u6570\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u7684\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u53c2\u6570\u503c\uff0c\u4ee5\u786e\u4fdd\u6bd4\u8f83\u7684\u7cbe\u5ea6\u3002<\/p>\n<\/p>\n
    \u4e09\u3001\u4f7f\u7528numpy.allclose()\u51fd\u6570<\/h3>\n<\/p>\n
    3.1 \u57fa\u672c\u7528\u6cd5<\/h4>\n<\/p>\n
    \u5982\u679c\u4f60\u4f7f\u7528NumPy\u5e93\u8fdb\u884c\u79d1\u5b66\u8ba1\u7b97\uff0cNumPy\u63d0\u4f9b\u4e86\u4e00\u4e2a\u540d\u4e3aallclose()\u7684\u51fd\u6570\uff0c\u53ef\u4ee5\u7528\u4e8e\u6bd4\u8f83\u4e24\u4e2a\u6570\u7ec4\u4e2d\u7684\u6d6e\u70b9\u6570\u662f\u5426\u5728\u4e00\u5b9a\u7684\u8bef\u5dee\u8303\u56f4\u5185\u76f8\u7b49\u3002\u8fd9\u4e2a\u51fd\u6570\u53ef\u4ee5\u8ba9\u6211\u4eec\u66f4\u65b9\u4fbf\u5730\u8fdb\u884c\u6570\u7ec4\u6bd4\u8f83\uff0c\u800c\u4e0d\u9700\u8981\u624b\u52a8\u5b9a\u4e49\u548c\u8ba1\u7b97\u8bef\u5dee\u8303\u56f4\u3002<\/p>\n<\/p>\n
    \u4f8b\u5982\uff1a<\/p>\n<\/p>\n
    import numpy as np<\/p>\n
    a = np.array([0.123456789, 0.987654321])<\/p>\n
    b = np.array([0.123456788, 0.987654322])<\/p>\n
    if np.allclose(a, b, rtol=1e-9):<\/p>\n
        print("a and b are equal")<\/p>\n
    else:<\/p>\n
        print("a and b are not equal")<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u4e86numpy.allclose()\u51fd\u6570\u6765\u6bd4\u8f83\u6570\u7ec4a\u548cb\u4e2d\u7684\u6d6e\u70b9\u6570\u662f\u5426\u76f8\u7b49\uff0c\u5e76\u8bbe\u5b9a\u4e86\u76f8\u5bf9\u8bef\u5dee\u8303\u56f4rtol\u4e3a1e-9\u3002numpy.allclose()\u51fd\u6570\u8fd8\u53ef\u4ee5\u63a5\u53d7\u4e00\u4e2a\u7edd\u5bf9\u8bef\u5dee\u8303\u56f4atol\u53c2\u6570\uff0c\u4ee5\u8fdb\u4e00\u6b65\u63d0\u9ad8\u6bd4\u8f83\u7684\u7075\u6d3b\u6027\u3002<\/p>\n<\/p>\n
    3.2 \u53c2\u6570\u89e3\u91ca<\/h4>\n<\/p>\n
    numpy.allclose()\u51fd\u6570\u6709\u4e24\u4e2a\u4e3b\u8981\u53c2\u6570\uff1artol\u548catol\u3002rtol\u8868\u793a\u76f8\u5bf9\u8bef\u5dee\u8303\u56f4\uff0c\u800catol\u8868\u793a\u7edd\u5bf9\u8bef\u5dee\u8303\u56f4\u3002\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u7684\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u53c2\u6570\u503c\uff0c\u4ee5\u786e\u4fdd\u6bd4\u8f83\u7684\u7cbe\u5ea6\u3002<\/p>\n<\/p>\n
      \n
    • \n
      rtol<\/strong>\uff1a\u76f8\u5bf9\u8bef\u5dee\u8303\u56f4\uff0c\u8868\u793a\u4e24\u4e2a\u6d6e\u70b9\u6570\u7684\u5dee\u5360\u5176\u4e2d\u4e00\u4e2a\u6570\u503c\u7684\u6bd4\u4f8b\u3002\u901a\u5e38\u7528\u4e8e\u6bd4\u8f83\u6570\u503c\u8f83\u5927\u7684\u6d6e\u70b9\u6570\u3002<\/p>\n<\/p>\n<\/li>\n
    • \n
      atol<\/strong>\uff1a\u7edd\u5bf9\u8bef\u5dee\u8303\u56f4\uff0c\u8868\u793a\u4e24\u4e2a\u6d6e\u70b9\u6570\u7684\u5dee\u7684\u7edd\u5bf9\u503c\u3002\u901a\u5e38\u7528\u4e8e\u6bd4\u8f83\u6570\u503c\u8f83\u5c0f\u7684\u6d6e\u70b9\u6570\u3002<\/p>\n<\/p>\n<\/li>\n<\/ul>\n
      \u4f7f\u7528numpy.allclose()\u51fd\u6570\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u7684\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u53c2\u6570\u503c\uff0c\u4ee5\u786e\u4fdd\u6bd4\u8f83\u7684\u7cbe\u5ea6\u3002<\/p>\n<\/p>\n
      \u56db\u3001\u76f4\u63a5\u6bd4\u8f83<\/h3>\n<\/p>\n
      4.1 \u9002\u7528\u573a\u666f<\/h4>\n<\/p>\n
      \u5728\u67d0\u4e9b\u7279\u5b9a\u573a\u666f\u4e0b\uff0c\u76f4\u63a5\u6bd4\u8f83\u4e24\u4e2a\u6d6e\u70b9\u6570\u662f\u5426\u76f8\u7b49\u53ef\u80fd\u662f\u5408\u9002\u7684\u3002\u4f8b\u5982\uff0c\u5f53\u4e24\u4e2a\u6d6e\u70b9\u6570\u90fd\u662f\u901a\u8fc7\u76f8\u540c\u7684\u8ba1\u7b97\u8fc7\u7a0b\u5f97\u5230\u7684\uff0c\u5e76\u4e14\u6211\u4eec\u53ef\u4ee5\u786e\u4fdd\u5b83\u4eec\u7684\u503c\u662f\u7cbe\u786e\u7684\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u76f4\u63a5\u6bd4\u8f83\u4e24\u4e2a\u6d6e\u70b9\u6570\u662f\u5426\u76f8\u7b49\u662f\u53ef\u884c\u7684\u3002<\/p>\n<\/p>\n
      \u4f8b\u5982\uff1a<\/p>\n<\/p>\n
      a = 0.5<\/p>\n
      b = 0.5<\/p>\n
      if a == b:<\/p>\n
          print("a and b are equal")<\/p>\n
      else:<\/p>\n
          print("a and b are not equal")<\/p>\n
      <\/code><\/pre>\n<\/p>\n
      \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0ca\u548cb\u7684\u503c\u90fd\u662f0.5\uff0c\u6211\u4eec\u53ef\u4ee5\u786e\u4fdd\u5b83\u4eec\u662f\u7cbe\u786e\u7684\uff0c\u56e0\u6b64\u76f4\u63a5\u6bd4\u8f83\u5b83\u4eec\u662f\u5426\u76f8\u7b49\u662f\u53ef\u884c\u7684\u3002<\/p>\n<\/p>\n
      4.2 \u5c40\u9650\u6027<\/h4>\n<\/p>\n
      \u7136\u800c\uff0c\u76f4\u63a5\u6bd4\u8f83\u6d6e\u70b9\u6570\u662f\u5426\u76f8\u7b49\u5b58\u5728\u4e00\u5b9a\u7684\u5c40\u9650\u6027\u3002\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u6d6e\u70b9\u6570\u5728\u8ba1\u7b97\u673a\u4e2d\u5b58\u50a8\u65f6\u4f1a\u51fa\u73b0\u7cbe\u5ea6\u635f\u5931\uff0c\u5bfc\u81f4\u76f4\u63a5\u6bd4\u8f83\u4e24\u4e2a\u6d6e\u70b9\u6570\u662f\u5426\u76f8\u7b49\u5f80\u5f80\u4e0d\u53ef\u9760\u3002\u56e0\u6b64\uff0c\u9664\u975e\u6211\u4eec\u53ef\u4ee5\u786e\u4fdd\u6d6e\u70b9\u6570\u7684\u503c\u662f\u7cbe\u786e\u7684\uff0c\u5426\u5219\u4e0d\u5efa\u8bae\u76f4\u63a5\u6bd4\u8f83\u6d6e\u70b9\u6570\u662f\u5426\u76f8\u7b49\u3002<\/p>\n<\/p>\n
      \u4e94\u3001\u5c06\u6d6e\u70b9\u6570\u8f6c\u6362\u4e3a\u6574\u6570<\/h3>\n<\/p>\n
      5.1 \u57fa\u672c\u601d\u8def<\/h4>\n<\/p>\n
      \u5c06\u6d6e\u70b9\u6570\u8f6c\u6362\u4e3a\u6574\u6570\u8fdb\u884c\u6bd4\u8f83\u662f\u53e6\u4e00\u79cd\u89e3\u51b3\u6d6e\u70b9\u6570\u6bd4\u8f83\u95ee\u9898\u7684\u65b9\u6cd5\u3002\u901a\u8fc7\u5c06\u6d6e\u70b9\u6570\u4e58\u4ee5\u4e00\u4e2a\u5927\u6570\uff08\u598210\u7684\u5e42\uff09\uff0c\u7136\u540e\u5c06\u5176\u8f6c\u6362\u4e3a\u6574\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u907f\u514d\u6d6e\u70b9\u6570\u7cbe\u5ea6\u95ee\u9898\uff0c\u4ece\u800c\u8fdb\u884c\u51c6\u786e\u7684\u6bd4\u8f83\u3002<\/p>\n<\/p>\n
      \u4f8b\u5982\uff1a<\/p>\n<\/p>\n
      a = 0.123456789<\/p>\n
      b = 0.123456788<\/p>\n
      scale = 1000000000<\/p>\n
      if int(a * scale) == int(b * scale):<\/p>\n
          print("a and b are equal")<\/p>\n
      else:<\/p>\n
          print("a and b are not equal")<\/p>\n
      <\/code><\/pre>\n<\/p>\n
      \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u5c06a\u548cb\u5206\u522b\u4e58\u4ee5\u4e00\u4e2a\u5927\u6570scale\uff081000000000\uff09\uff0c\u7136\u540e\u5c06\u5b83\u4eec\u8f6c\u6362\u4e3a\u6574\u6570\u8fdb\u884c\u6bd4\u8f83\u3002\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u6d6e\u70b9\u6570\u7cbe\u5ea6\u95ee\u9898\uff0c\u4ece\u800c\u8fdb\u884c\u51c6\u786e\u7684\u6bd4\u8f83\u3002<\/p>\n<\/p>\n
      5.2 \u5c40\u9650\u6027<\/h4>\n<\/p>\n
      \u5c06\u6d6e\u70b9\u6570\u8f6c\u6362\u4e3a\u6574\u6570\u8fdb\u884c\u6bd4\u8f83\u7684\u65b9\u6cd5\u6709\u4e00\u5b9a\u7684\u5c40\u9650\u6027\u3002\u9996\u5148\uff0c\u8fd9\u79cd\u65b9\u6cd5\u4f9d\u8d56\u4e8e\u9009\u62e9\u5408\u9002\u7684scale\u503c\u3002\u5982\u679cscale\u503c\u9009\u62e9\u4e0d\u5f53\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6bd4\u8f83\u7ed3\u679c\u4e0d\u51c6\u786e\u3002\u5176\u6b21\uff0c\u8fd9\u79cd\u65b9\u6cd5\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6570\u503c\u6ea2\u51fa\u95ee\u9898\uff0c\u7279\u522b\u662f\u5728\u5904\u7406\u975e\u5e38\u5927\u7684\u6d6e\u70b9\u6570\u65f6\u3002\u56e0\u6b64\uff0c\u4f7f\u7528\u8fd9\u79cd\u65b9\u6cd5\u65f6\u9700\u8981\u8c28\u614e\u3002<\/p>\n<\/p>\n
      \u603b\u7ed3<\/h3>\n<\/p>\n
      \u6bd4\u8f83\u4e24\u4e2a\u6d6e\u70b9\u6570\u662f\u5426\u76f8\u7b49\u662f\u4e00\u4e2a\u5e38\u89c1\u4e14\u91cd\u8981\u7684\u95ee\u9898\u3002\u5728\u8ba1\u7b97\u673a\u4e2d\uff0c\u7531\u4e8e\u6d6e\u70b9\u6570\u7684\u8868\u793a\u5b58\u5728\u4e00\u5b9a\u7684\u8bef\u5dee\uff0c\u76f4\u63a5\u6bd4\u8f83\u4e24\u4e2a\u6d6e\u70b9\u6570\u662f\u5426\u76f8\u7b49\u5f80\u5f80\u4e0d\u53ef\u9760\u3002\u4e3a\u4e86\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u6211\u4eec\u53ef\u4ee5\u91c7\u7528\u4ee5\u4e0b\u51e0\u79cd\u65b9\u6cd5\uff1a<\/p>\n<\/p>\n
        \n
      1. \u4f7f\u7528\u8bef\u5dee\u8303\u56f4<\/strong>\uff1a\u5b9a\u4e49\u4e00\u4e2a\u5f88\u5c0f\u7684\u8bef\u5dee\u8303\u56f4epsilon\uff0c\u901a\u8fc7\u8ba1\u7b97\u4e24\u4e2a\u6d6e\u70b9\u6570\u7684\u5dee\u7684\u7edd\u5bf9\u503c\u662f\u5426\u5c0f\u4e8e\u8fd9\u4e2a\u8bef\u5dee\u8303\u56f4\u6765\u5224\u65ad\u5b83\u4eec\u662f\u5426\u76f8\u7b49\u3002<\/li>\n
      2. \u4f7f\u7528math.isclose()\u51fd\u6570<\/strong>\uff1aPython\u7684\u6807\u51c6\u5e93math\u6a21\u5757\u63d0\u4f9b\u4e86\u4e00\u4e2a\u540d\u4e3aisclose()\u7684\u51fd\u6570\uff0c\u53ef\u4ee5\u7528\u4e8e\u6bd4\u8f83\u4e24\u4e2a\u6d6e\u70b9\u6570\u662f\u5426\u5728\u4e00\u5b9a\u7684\u8bef\u5dee\u8303\u56f4\u5185\u76f8\u7b49\u3002<\/li>\n
      3. \u4f7f\u7528numpy.allclose()\u51fd\u6570<\/strong>\uff1a\u5982\u679c\u4f60\u4f7f\u7528NumPy\u5e93\u8fdb\u884c\u79d1\u5b66\u8ba1\u7b97\uff0cNumPy\u63d0\u4f9b\u4e86\u4e00\u4e2a\u540d\u4e3aallclose()\u7684\u51fd\u6570\uff0c\u53ef\u4ee5\u7528\u4e8e\u6bd4\u8f83\u4e24\u4e2a\u6570\u7ec4\u4e2d\u7684\u6d6e\u70b9\u6570\u662f\u5426\u5728\u4e00\u5b9a\u7684\u8bef\u5dee\u8303\u56f4\u5185\u76f8\u7b49\u3002<\/li>\n
      4. \u76f4\u63a5\u6bd4\u8f83<\/strong>\uff1a\u5728\u67d0\u4e9b\u7279\u5b9a\u573a\u666f\u4e0b\uff0c\u5f53\u6211\u4eec\u53ef\u4ee5\u786e\u4fdd\u6d6e\u70b9\u6570\u7684\u503c\u662f\u7cbe\u786e\u7684\u65f6\uff0c\u53ef\u4ee5\u76f4\u63a5\u6bd4\u8f83\u4e24\u4e2a\u6d6e\u70b9\u6570\u662f\u5426\u76f8\u7b49\u3002<\/li>\n
      5. \u5c06\u6d6e\u70b9\u6570\u8f6c\u6362\u4e3a\u6574\u6570<\/strong>\uff1a\u901a\u8fc7\u5c06\u6d6e\u70b9\u6570\u4e58\u4ee5\u4e00\u4e2a\u5927\u6570\uff0c\u7136\u540e\u5c06\u5176\u8f6c\u6362\u4e3a\u6574\u6570\u8fdb\u884c\u6bd4\u8f83\uff0c\u53ef\u4ee5\u907f\u514d\u6d6e\u70b9\u6570\u7cbe\u5ea6\u95ee\u9898\uff0c\u4ece\u800c\u8fdb\u884c\u51c6\u786e\u7684\u6bd4\u8f83\u3002<\/li>\n<\/ol>\n
        \u6bcf\u79cd\u65b9\u6cd5\u90fd\u6709\u5176\u9002\u7528\u573a\u666f\u548c\u5c40\u9650\u6027\uff0c\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u7684\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u8fdb\u884c\u6d6e\u70b9\u6570\u6bd4\u8f83\u3002<\/p>\n<\/p>\n
        \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
         \u5982\u4f55\u5728Python\u4e2d\u5b89\u5168\u5730\u6bd4\u8f83\u4e24\u4e2a\u6d6e\u70b9\u6570\uff1f<\/strong>
        \u5728Python\u4e2d\uff0c\u6d6e\u70b9\u6570\u7531\u4e8e\u7cbe\u5ea6\u95ee\u9898\u53ef\u80fd\u4f1a\u5bfc\u81f4\u76f4\u63a5\u6bd4\u8f83\u65f6\u51fa\u73b0\u610f\u5916\u7ed3\u679c\u3002\u4e3a\u4e86\u5b89\u5168\u6bd4\u8f83\u4e24\u4e2a\u6d6e\u70b9\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528math.isclose()<\/code>\u51fd\u6570\uff0c\u8be5\u51fd\u6570\u5141\u8bb8\u4f60\u8bbe\u5b9a\u4e00\u4e2a\u76f8\u5bf9\u6216\u7edd\u5bf9\u5bb9\u5dee\u3002\u4f8b\u5982\uff0cmath.isclose(a, b, rel_tol=1e-9)<\/code>\u53ef\u4ee5\u6709\u6548\u5730\u5224\u65ada<\/code>\u548cb<\/code>\u662f\u5426\u8db3\u591f\u63a5\u8fd1\uff0c\u4ece\u800c\u8ba4\u4e3a\u5b83\u4eec\u76f8\u7b49\u3002<\/p>\n
        \u6d6e\u70b9\u6570\u6bd4\u8f83\u65f6\u5e38\u89c1\u7684\u8bef\u533a\u662f\u4ec0\u4e48\uff1f<\/strong>
        \u8bb8\u591a\u7a0b\u5e8f\u5458\u5728\u6bd4\u8f83\u6d6e\u70b9\u6570\u65f6\u4f1a\u76f4\u63a5\u4f7f\u7528==<\/code>\u8fd0\u7b97\u7b26\uff0c\u8fd9\u53ef\u80fd\u5bfc\u81f4\u4e0d\u53ef\u9760\u7684\u7ed3\u679c\u3002\u6d6e\u70b9\u6570\u5728\u8ba1\u7b97\u8fc7\u7a0b\u4e2d\u53ef\u80fd\u4f1a\u5f15\u5165\u5fae\u5c0f\u7684\u8bef\u5dee\uff0c\u56e0\u6b64\u5373\u4f7f\u4e24\u4e2a\u6570\u5b57\u770b\u4f3c\u76f8\u7b49\uff0c\u5b9e\u9645\u4e0a\u5b83\u4eec\u7684\u503c\u53ef\u80fd\u7565\u6709\u4e0d\u540c\u3002\u4f7f\u7528\u5bb9\u5dee\u6bd4\u8f83\u7684\u65b9\u6cd5\u53ef\u4ee5\u907f\u514d\u8fd9\u4e00\u8bef\u533a\u3002<\/p>\n
        \u5982\u4f55\u81ea\u5b9a\u4e49\u6d6e\u70b9\u6570\u6bd4\u8f83\u7684\u5bb9\u5dee\uff1f<\/strong>
        \u5728Python\u4e2d\uff0c\u4f60\u53ef\u4ee5\u901a\u8fc7math.isclose()<\/code>\u51fd\u6570\u7684rel_tol<\/code>\u548cabs_tol<\/code>\u53c2\u6570\u6765\u81ea\u5b9a\u4e49\u5bb9\u5dee\u3002rel_tol<\/code>\u6307\u5b9a\u76f8\u5bf9\u5bb9\u5dee\uff0c\u9002\u7528\u4e8e\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u7684\u6bd4\u8f83\uff1b\u800cabs_tol<\/code>\u5219\u9002\u7528\u4e8e\u6bd4\u8f83\u63a5\u8fd1\u4e8e\u96f6\u7684\u6570\u503c\u3002\u901a\u8fc7\u5408\u7406\u8bbe\u7f6e\u8fd9\u4e24\u4e2a\u53c2\u6570\uff0c\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u9700\u6c42\u8c03\u6574\u6bd4\u8f83\u7684\u7075\u6d3b\u6027\u548c\u7cbe\u786e\u5ea6\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Python\u5982\u4f55\u6bd4\u8f83\u4e24\u4e2a\u6d6e\u70b9\u6570\u662f\u5426\u76f8\u7b49\uff1a\u4f7f\u7528\u8bef\u5dee\u8303\u56f4\u3001\u4f7f\u7528math.isclose()\u51fd\u6570\u3001\u4f7f\u7528numpy.a […]","protected":false},"author":3,"featured_media":1139497,"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\/1139489"}],"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=1139489"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1139489\/revisions"}],"predecessor-version":[{"id":1139501,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1139489\/revisions\/1139501"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1139497"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1139489"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1139489"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1139489"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}