{"id":1097429,"date":"2025-01-08T15:11:48","date_gmt":"2025-01-08T07:11:48","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1097429.html"},"modified":"2025-01-08T15:11:51","modified_gmt":"2025-01-08T07:11:51","slug":"python%e4%b8%ad%e5%a6%82%e4%bd%95%e5%8f%96%e6%95%b0%e7%9a%84%e6%ad%a3%e8%b4%9f%e7%ac%a6%e5%8f%b7-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1097429.html","title":{"rendered":"python\u4e2d\u5982\u4f55\u53d6\u6570\u7684\u6b63\u8d1f\u7b26\u53f7"},"content":{"rendered":"<p style=\"text-align:center;\" ><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/24212215\/e6af00aa-dc2c-4b9f-9222-ef2d34077d02.webp\" alt=\"python\u4e2d\u5982\u4f55\u53d6\u6570\u7684\u6b63\u8d1f\u7b26\u53f7\" \/><\/p>\n<p><p> \u5728Python\u4e2d\u53d6\u6570\u7684\u6b63\u8d1f\u7b26\u53f7\uff0c\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u6cd5\u6765\u5b9e\u73b0\u3002<strong>\u4f7f\u7528\u5185\u7f6e\u51fd\u6570<code>sign()<\/code>\u3001\u6bd4\u8f83\u8fd0\u7b97\u3001\u4e09\u5143\u8fd0\u7b97\u7b26\u3001NumPy\u5e93\u4e2d\u7684<code>sign()<\/code>\u51fd\u6570<\/strong>\u3002\u5176\u4e2d\uff0c\u4f7f\u7528NumPy\u5e93\u7684<code>sign()<\/code>\u51fd\u6570\u662f\u6700\u5e38\u89c1\u7684\u65b9\u6cd5\u4e4b\u4e00\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u6bcf\u79cd\u65b9\u6cd5\u53ca\u5176\u5177\u4f53\u5b9e\u73b0\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u4f7f\u7528\u5185\u7f6e\u51fd\u6570<code>sign()<\/code><\/h3>\n<\/p>\n<p><p>Python\u672c\u8eab\u6ca1\u6709\u5185\u7f6e\u7684<code>sign()<\/code>\u51fd\u6570\uff0c\u4f46\u6211\u4eec\u53ef\u4ee5\u81ea\u5b9a\u4e49\u4e00\u4e2a\u51fd\u6570\u6765\u5b9e\u73b0\u8fd9\u4e2a\u529f\u80fd\u3002\u8fd9\u4e2a\u51fd\u6570\u53ef\u4ee5\u901a\u8fc7\u5224\u65ad\u6570\u503c\u7684\u6b63\u8d1f\u6765\u8fd4\u56de\u76f8\u5e94\u7684\u7b26\u53f7\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">def sign(x):<\/p>\n<p>    if x &gt; 0:<\/p>\n<p>        return 1<\/p>\n<p>    elif x &lt; 0:<\/p>\n<p>        return -1<\/p>\n<p>    else:<\/p>\n<p>        return 0<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u4e2a\u81ea\u5b9a\u4e49\u7684<code>sign()<\/code>\u51fd\u6570\u53ef\u4ee5\u63a5\u53d7\u4e00\u4e2a\u6570\u503c\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u8fd4\u56de1\uff08\u6b63\u6570\uff09\u3001-1\uff08\u8d1f\u6570\uff09\u62160\uff08\u96f6\uff09\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">print(sign(10))  # \u8f93\u51fa: 1<\/p>\n<p>print(sign(-7))  # \u8f93\u51fa: -1<\/p>\n<p>print(sign(0))   # \u8f93\u51fa: 0<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e8c\u3001\u6bd4\u8f83\u8fd0\u7b97<\/h3>\n<\/p>\n<p><p>\u901a\u8fc7\u6bd4\u8f83\u8fd0\u7b97\uff0c\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u5224\u65ad\u4e00\u4e2a\u6570\u7684\u6b63\u8d1f\u7b26\u53f7\u3002\u53ef\u4ee5\u4f7f\u7528\u6761\u4ef6\u8868\u8fbe\u5f0f\u6216\u7b80\u5355\u7684if-else\u8bed\u53e5\u6765\u5b9e\u73b0\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\"># \u4f7f\u7528\u6761\u4ef6\u8868\u8fbe\u5f0f<\/p>\n<p>x = -5<\/p>\n<p>sign = 1 if x &gt; 0 else -1 if x &lt; 0 else 0<\/p>\n<p>print(sign)  # \u8f93\u51fa: -1<\/p>\n<h2><strong>\u4f7f\u7528if-else\u8bed\u53e5<\/strong><\/h2>\n<p>x = 8<\/p>\n<p>if x &gt; 0:<\/p>\n<p>    sign = 1<\/p>\n<p>elif x &lt; 0:<\/p>\n<p>    sign = -1<\/p>\n<p>else:<\/p>\n<p>    sign = 0<\/p>\n<p>print(sign)  # \u8f93\u51fa: 1<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e09\u3001\u4e09\u5143\u8fd0\u7b97\u7b26<\/h3>\n<\/p>\n<p><p>Python\u4e2d\u7684\u4e09\u5143\u8fd0\u7b97\u7b26\u662f\u4e00\u79cd\u7b80\u6d01\u7684\u6761\u4ef6\u8868\u8fbe\u5f0f\uff0c\u53ef\u4ee5\u5728\u4e00\u884c\u4ee3\u7801\u4e2d\u5b9e\u73b0\u5bf9\u6570\u503c\u6b63\u8d1f\u7b26\u53f7\u7684\u5224\u65ad\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">x = -3<\/p>\n<p>sign = (x &gt; 0) - (x &lt; 0)<\/p>\n<p>print(sign)  # \u8f93\u51fa: -1<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u8868\u8fbe\u5f0f<code>(x &gt; 0)<\/code>\u8fd4\u56de\u5e03\u5c14\u503c<code>True<\/code>\uff08\u5bf9\u5e94\u6574\u65701\uff09\u6216<code>False<\/code>\uff08\u5bf9\u5e94\u6574\u65700\uff09\uff0c\u8868\u8fbe\u5f0f<code>(x &lt; 0)<\/code>\u4e5f\u7c7b\u4f3c\u3002\u901a\u8fc7\u51cf\u6cd5\u8fd0\u7b97\uff0c\u53ef\u4ee5\u5f97\u5230\u6570\u503c\u7684\u6b63\u8d1f\u7b26\u53f7\u3002<\/p>\n<\/p>\n<p><h3>\u56db\u3001\u4f7f\u7528NumPy\u5e93\u4e2d\u7684<code>sign()<\/code>\u51fd\u6570<\/h3>\n<\/p>\n<p><p>NumPy\u662f\u4e00\u4e2a\u7528\u4e8e\u79d1\u5b66\u8ba1\u7b97\u7684\u6d41\u884cPython\u5e93\uff0c\u5b83\u63d0\u4f9b\u4e86\u8bb8\u591a\u5f3a\u5927\u7684\u6570\u5b66\u51fd\u6570\uff0c\u5305\u62ec<code>sign()<\/code>\u51fd\u6570\u3002\u4f7f\u7528NumPy\u5e93\u53ef\u4ee5\u66f4\u9ad8\u6548\u5730\u5904\u7406\u6570\u7ec4\u548c\u6570\u503c\u6570\u636e\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import numpy as np<\/p>\n<p>x = np.array([-10, 0, 5])<\/p>\n<p>signs = np.sign(x)<\/p>\n<p>print(signs)  # \u8f93\u51fa: [-1  0  1]<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u9996\u5148\u5bfc\u5165NumPy\u5e93\uff0c\u7136\u540e\u521b\u5efa\u4e00\u4e2a\u5305\u542b\u591a\u4e2a\u6570\u503c\u7684\u6570\u7ec4<code>x<\/code>\uff0c\u6700\u540e\u4f7f\u7528<code>np.sign()<\/code>\u51fd\u6570\u6765\u83b7\u53d6\u6bcf\u4e2a\u6570\u503c\u7684\u6b63\u8d1f\u7b26\u53f7\u3002<\/p>\n<\/p>\n<p><h3>\u4e94\u3001\u8be6\u7ec6\u63cf\u8ff0\u4f7f\u7528NumPy\u5e93\u7684\u4f18\u70b9<\/h3>\n<\/p>\n<p><p><strong>\u4f7f\u7528NumPy\u5e93\u7684<code>sign()<\/code>\u51fd\u6570\u7684\u4f18\u70b9\u4e3b\u8981\u5728\u4e8e\u5176\u9ad8\u6548\u6027\u548c\u7b80\u6d01\u6027\u3002<\/strong><\/p>\n<\/p>\n<ol>\n<li><strong>\u9ad8\u6548\u6027<\/strong>\uff1aNumPy\u5e93\u662f\u4e13\u95e8\u4e3a\u79d1\u5b66\u8ba1\u7b97\u8bbe\u8ba1\u7684\uff0c\u5e95\u5c42\u4f7f\u7528C\u8bed\u8a00\u5b9e\u73b0\uff0c\u6027\u80fd\u4f18\u8d8a\u3002\u5bf9\u4e8e\u5927\u89c4\u6a21\u6570\u636e\u7684\u5904\u7406\uff0cNumPy\u5e93\u7684\u6548\u7387\u8fdc\u9ad8\u4e8e\u7eafPython\u4ee3\u7801\u3002<\/li>\n<li><strong>\u7b80\u6d01\u6027<\/strong>\uff1a\u4f7f\u7528NumPy\u5e93\u53ef\u4ee5\u7528\u4e00\u884c\u4ee3\u7801\u5b9e\u73b0\u5bf9\u6570\u7ec4\u4e2d\u6240\u6709\u5143\u7d20\u6b63\u8d1f\u7b26\u53f7\u7684\u5224\u65ad\uff0c\u4ee3\u7801\u7b80\u6d01\u4e14\u6613\u4e8e\u7ef4\u62a4\u3002<\/li>\n<li><strong>\u517c\u5bb9\u6027<\/strong>\uff1aNumPy\u5e93\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u51fd\u6570\u548c\u64cd\u4f5c\uff0c\u80fd\u591f\u4e0e\u5176\u4ed6\u79d1\u5b66\u8ba1\u7b97\u5e93\uff08\u5982SciPy\u3001Pandas\uff09\u65e0\u7f1d\u96c6\u6210\uff0c\u65b9\u4fbf\u8fdb\u884c\u590d\u6742\u7684\u6570\u636e\u5904\u7406\u548c\u5206\u6790\u3002<\/li>\n<\/ol>\n<p><p>\u4f8b\u5982\uff0c\u5728\u5904\u7406\u5927\u91cf\u6570\u636e\u65f6\uff0c\u4f7f\u7528NumPy\u5e93\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u4ee3\u7801\u7684\u6267\u884c\u901f\u5ea6\u548c\u6548\u7387\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import numpy as np<\/p>\n<h2><strong>\u521b\u5efa\u4e00\u4e2a\u5305\u542b100\u4e07\u4e2a\u968f\u673a\u6570\u7684\u6570\u7ec4<\/strong><\/h2>\n<p>large_array = np.random.randn(1000000)<\/p>\n<h2><strong>\u4f7f\u7528NumPy\u7684sign\u51fd\u6570\u83b7\u53d6\u6bcf\u4e2a\u6570\u503c\u7684\u6b63\u8d1f\u7b26\u53f7<\/strong><\/h2>\n<p>signs = np.sign(large_array)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u5305\u542b100\u4e07\u4e2a\u968f\u673a\u6570\u7684\u6570\u7ec4\uff0c\u5e76\u4f7f\u7528NumPy\u7684<code>sign()<\/code>\u51fd\u6570\u9ad8\u6548\u5730\u83b7\u53d6\u6bcf\u4e2a\u6570\u503c\u7684\u6b63\u8d1f\u7b26\u53f7\u3002\u8fd9\u79cd\u65b9\u6cd5\u4e0d\u4ec5\u4ee3\u7801\u7b80\u6d01\uff0c\u8fd8\u80fd\u663e\u8457\u63d0\u9ad8\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\u7684\u6548\u7387\u3002<\/p>\n<\/p>\n<p><h3>\u516d\u3001\u603b\u7ed3<\/h3>\n<\/p>\n<p><p>\u5728Python\u4e2d\u53d6\u6570\u7684\u6b63\u8d1f\u7b26\u53f7\uff0c\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u6cd5\u6765\u5b9e\u73b0\uff0c\u5305\u62ec\u81ea\u5b9a\u4e49\u51fd\u6570\u3001\u6bd4\u8f83\u8fd0\u7b97\u3001\u4e09\u5143\u8fd0\u7b97\u7b26\u548c\u4f7f\u7528NumPy\u5e93\u4e2d\u7684<code>sign()<\/code>\u51fd\u6570\u3002\u4e0d\u540c\u7684\u65b9\u6cd5\u5404\u6709\u4f18\u7f3a\u70b9\uff0c\u9009\u62e9\u54ea\u79cd\u65b9\u6cd5\u53d6\u51b3\u4e8e\u5177\u4f53\u7684\u5e94\u7528\u573a\u666f\u548c\u9700\u6c42\u3002\u5bf9\u4e8e\u5927\u89c4\u6a21\u6570\u636e\u5904\u7406\uff0c\u63a8\u8350\u4f7f\u7528NumPy\u5e93\u7684<code>sign()<\/code>\u51fd\u6570\uff0c\u56e0\u4e3a\u5b83\u5177\u6709\u9ad8\u6548\u6027\u548c\u7b80\u6d01\u6027\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p> <strong>\u5982\u4f55\u5728Python\u4e2d\u5224\u65ad\u4e00\u4e2a\u6570\u7684\u7b26\u53f7\uff1f<\/strong><br \/>\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u7b80\u5355\u7684\u6761\u4ef6\u8bed\u53e5\u6765\u5224\u65ad\u4e00\u4e2a\u6570\u662f\u6b63\u6570\u8fd8\u662f\u8d1f\u6570\u3002\u4f7f\u7528if\u8bed\u53e5\u53ef\u4ee5\u8f7b\u677e\u5b9e\u73b0\uff0c\u4f8b\u5982\uff1a  <\/p>\n<pre><code class=\"language-python\">number = -10\nif number &gt; 0:\n    print(&quot;\u6b63\u6570&quot;)\nelif number &lt; 0:\n    print(&quot;\u8d1f\u6570&quot;)\nelse:\n    print(&quot;\u96f6&quot;)\n<\/code><\/pre>\n<p>\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u6709\u6548\u5730\u5e2e\u52a9\u4f60\u8bc6\u522b\u6570\u7684\u7b26\u53f7\u3002<\/p>\n<p><strong>\u5728Python\u4e2d\u662f\u5426\u6709\u5185\u7f6e\u7684\u51fd\u6570\u53ef\u4ee5\u83b7\u53d6\u6570\u7684\u7b26\u53f7\uff1f<\/strong><br \/>\u867d\u7136Python\u6ca1\u6709\u4e13\u95e8\u7684\u5185\u7f6e\u51fd\u6570\u6765\u76f4\u63a5\u83b7\u53d6\u6570\u7684\u7b26\u53f7\uff0c\u4f46\u53ef\u4ee5\u5229\u7528numpy\u5e93\u7684sign\u51fd\u6570\u6765\u5b9e\u73b0\u3002\u4f7f\u7528\u65b9\u6cd5\u5982\u4e0b\uff1a  <\/p>\n<pre><code class=\"language-python\">import numpy as np\nnumber = -5\nsign = np.sign(number)\nprint(sign)  # \u8f93\u51fa -1\n<\/code><\/pre>\n<p>\u8fd9\u4e2a\u51fd\u6570\u8fd4\u56de1\u8868\u793a\u6b63\u6570\uff0c-1\u8868\u793a\u8d1f\u6570\uff0c0\u8868\u793a\u96f6\uff0c\u65b9\u4fbf\u5feb\u6377\u3002<\/p>\n<p><strong>\u5982\u4f55\u5728Python\u4e2d\u5c06\u6570\u7684\u7b26\u53f7\u63d0\u53d6\u4e3a\u72ec\u7acb\u7684\u53d8\u91cf\uff1f<\/strong><br \/>\u63d0\u53d6\u6570\u7684\u7b26\u53f7\u5e76\u5c06\u5176\u5b58\u50a8\u4e3a\u72ec\u7acb\u53d8\u91cf\u53ef\u4ee5\u901a\u8fc7\u7b80\u5355\u7684\u6570\u5b66\u8fd0\u7b97\u6216\u6761\u4ef6\u8868\u8fbe\u5f0f\u5b9e\u73b0\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a  <\/p>\n<pre><code class=\"language-python\">number = 7\nsign = 1 if number &gt; 0 else -1 if number &lt; 0 else 0\nprint(sign)  # \u8f93\u51fa 1\n<\/code><\/pre>\n<p>\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u5728\u4e0d\u4f7f\u7528\u590d\u6742\u6761\u4ef6\u7684\u60c5\u51b5\u4e0b\uff0c\u8f7b\u677e\u83b7\u53d6\u6570\u7684\u7b26\u53f7\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\u53d6\u6570\u7684\u6b63\u8d1f\u7b26\u53f7\uff0c\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u6cd5\u6765\u5b9e\u73b0\u3002\u4f7f\u7528\u5185\u7f6e\u51fd\u6570sign()\u3001\u6bd4\u8f83\u8fd0\u7b97\u3001\u4e09\u5143\u8fd0\u7b97\u7b26\u3001Num [&hellip;]","protected":false},"author":3,"featured_media":1097437,"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\/1097429"}],"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=1097429"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1097429\/revisions"}],"predecessor-version":[{"id":1097440,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1097429\/revisions\/1097440"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1097437"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1097429"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1097429"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1097429"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}