{"id":1034860,"date":"2024-12-31T11:53:48","date_gmt":"2024-12-31T03:53:48","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1034860.html"},"modified":"2024-12-31T11:53:50","modified_gmt":"2024-12-31T03:53:50","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8python%e7%a9%ba%e7%9a%84%e6%95%b0%e7%bb%84%e9%95%bf%e5%ba%a6","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1034860.html","title":{"rendered":"\u5982\u4f55\u5728python\u7a7a\u7684\u6570\u7ec4\u957f\u5ea6"},"content":{"rendered":"<p style=\"text-align:center;\" ><img decoding=\"async\" src=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2024\/12\/4de5b4bd-3412-4b03-97fb-76c51a40e33f.webp?x-oss-process=image\/auto-orient,1\/format,webp\" alt=\"\u5982\u4f55\u5728python\u7a7a\u7684\u6570\u7ec4\u957f\u5ea6\" \/><\/p>\n<p><p> <strong>\u5728Python\u4e2d\uff0c\u83b7\u53d6\u7a7a\u6570\u7ec4\u7684\u957f\u5ea6\u53ef\u4ee5\u4f7f\u7528len()\u51fd\u6570\u3001\u68c0\u67e5\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u3001\u4f7f\u7528\u6570\u7ec4\u7684\u65b9\u6cd5<\/strong>\u3002\u4ee5\u4e0b\u662f\u5bf9\u5176\u4e2d\u4e00\u79cd\u65b9\u6cd5\u7684\u8be6\u7ec6\u63cf\u8ff0\uff1a<\/p>\n<\/p>\n<p><p>\u5728Python\u4e2d\uff0c\u83b7\u53d6\u4e00\u4e2a\u7a7a\u6570\u7ec4\u7684\u957f\u5ea6\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u5185\u7f6e\u7684<code>len()<\/code>\u51fd\u6570\u8fdb\u884c\u3002<code>len()<\/code>\u51fd\u6570\u53ef\u4ee5\u8fd4\u56de\u4efb\u4f55\u96c6\u5408\u7c7b\u578b\uff08\u5305\u62ec\u5217\u8868\u3001\u5143\u7ec4\u3001\u96c6\u5408\u3001\u5b57\u5178\u7b49\uff09\u7684\u5143\u7d20\u6570\u91cf\u3002\u5bf9\u4e8e\u4e00\u4e2a\u7a7a\u6570\u7ec4\uff08\u5217\u8868\uff09\uff0c\u8fd9\u4e2a\u51fd\u6570\u5c06\u8fd4\u56de0\u3002\u4e3e\u4f8b\u6765\u8bf4\uff0c\u5982\u679c\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u7a7a\u7684\u6570\u7ec4<code>arr<\/code>\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u8c03\u7528<code>len(arr)<\/code>\u6765\u83b7\u5f97\u5176\u957f\u5ea6\u3002\u5177\u4f53\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\"># \u521b\u5efa\u4e00\u4e2a\u7a7a\u7684\u6570\u7ec4<\/p>\n<p>arr = []<\/p>\n<h2><strong>\u4f7f\u7528 len() \u51fd\u6570\u83b7\u53d6\u6570\u7ec4\u7684\u957f\u5ea6<\/strong><\/h2>\n<p>length = len(arr)<\/p>\n<h2><strong>\u8f93\u51fa\u6570\u7ec4\u7684\u957f\u5ea6<\/strong><\/h2>\n<p>print(&quot;\u7a7a\u6570\u7ec4\u7684\u957f\u5ea6\u662f:&quot;, length)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u4ee5\u4e0a\u4ee3\u7801\u4e2d\uff0c<code>arr<\/code>\u662f\u4e00\u4e2a\u7a7a\u6570\u7ec4\uff0c<code>len(arr)<\/code>\u8fd4\u56de\u8be5\u6570\u7ec4\u7684\u957f\u5ea6\uff0c\u53730\u3002<\/p>\n<\/p>\n<p><p>\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u8ba8\u8bba\u5982\u4f55\u5728Python\u4e2d\u5904\u7406\u7a7a\u6570\u7ec4\u7684\u957f\u5ea6\u4ee5\u53ca\u76f8\u5173\u7684\u51e0\u79cd\u65b9\u6cd5\u548c\u6ce8\u610f\u4e8b\u9879\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u4f7f\u7528len()\u51fd\u6570\u83b7\u53d6\u7a7a\u6570\u7ec4\u957f\u5ea6<\/h3>\n<\/p>\n<p><p><code>len()<\/code>\u51fd\u6570\u662fPython\u7684\u5185\u7f6e\u51fd\u6570\uff0c\u53ef\u4ee5\u7528\u4e8e\u83b7\u53d6\u4efb\u4f55\u5e8f\u5217\uff08\u5982\u5b57\u7b26\u4e32\u3001\u5217\u8868\u3001\u5143\u7ec4\uff09\u7684\u957f\u5ea6\u3002\u5bf9\u4e8e\u7a7a\u6570\u7ec4\uff0c<code>len()<\/code>\u51fd\u6570\u8fd4\u56de0\u3002<\/p>\n<\/p>\n<p><h4>\u793a\u4f8b\u4ee3\u7801\uff1a<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\"># \u521b\u5efa\u4e00\u4e2a\u7a7a\u7684\u6570\u7ec4<\/p>\n<p>arr = []<\/p>\n<h2><strong>\u4f7f\u7528 len() \u51fd\u6570\u83b7\u53d6\u6570\u7ec4\u7684\u957f\u5ea6<\/strong><\/h2>\n<p>length = len(arr)<\/p>\n<h2><strong>\u8f93\u51fa\u6570\u7ec4\u7684\u957f\u5ea6<\/strong><\/h2>\n<p>print(&quot;\u7a7a\u6570\u7ec4\u7684\u957f\u5ea6\u662f:&quot;, length)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c<code>arr<\/code>\u662f\u4e00\u4e2a\u7a7a\u6570\u7ec4\uff0c<code>len(arr)<\/code>\u8fd4\u56de0\uff0c\u8868\u793a\u6570\u7ec4\u7684\u957f\u5ea6\u4e3a0\u3002<\/p>\n<\/p>\n<p><h3>\u4e8c\u3001\u68c0\u67e5\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a<\/h3>\n<\/p>\n<p><p>\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u68c0\u67e5\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\uff0c\u5e76\u6839\u636e\u68c0\u67e5\u7ed3\u679c\u6267\u884c\u4e0d\u540c\u7684\u64cd\u4f5c\u3002\u53ef\u4ee5\u901a\u8fc7\u6bd4\u8f83\u6570\u7ec4\u957f\u5ea6\u662f\u5426\u4e3a0\u6765\u5b9e\u73b0\u8fd9\u4e00\u70b9\u3002<\/p>\n<\/p>\n<p><h4>\u793a\u4f8b\u4ee3\u7801\uff1a<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\"># \u521b\u5efa\u4e00\u4e2a\u7a7a\u7684\u6570\u7ec4<\/p>\n<p>arr = []<\/p>\n<h2><strong>\u68c0\u67e5\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a<\/strong><\/h2>\n<p>if len(arr) == 0:<\/p>\n<p>    print(&quot;\u6570\u7ec4\u662f\u7a7a\u7684&quot;)<\/p>\n<p>else:<\/p>\n<p>    print(&quot;\u6570\u7ec4\u4e0d\u662f\u7a7a\u7684&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u901a\u8fc7\u5224\u65ad<code>len(arr) == 0<\/code>\u6765\u68c0\u67e5\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u3002\u5982\u679c\u6570\u7ec4\u957f\u5ea6\u4e3a0\uff0c\u5219\u6570\u7ec4\u662f\u7a7a\u7684\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001\u4f7f\u7528\u6570\u7ec4\u7684\u65b9\u6cd5<\/h3>\n<\/p>\n<p><p>Python\u7684\u5217\u8868\u5bf9\u8c61\u63d0\u4f9b\u4e86\u4e00\u4e9b\u65b9\u6cd5\uff0c\u53ef\u4ee5\u65b9\u4fbf\u5730\u64cd\u4f5c\u6570\u7ec4\u3002\u5bf9\u4e8e\u7a7a\u6570\u7ec4\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u8fd9\u4e9b\u65b9\u6cd5\u6765\u786e\u8ba4\u6570\u7ec4\u7684\u72b6\u6001\u3002<\/p>\n<\/p>\n<p><h4>\u793a\u4f8b\u4ee3\u7801\uff1a<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\"># \u521b\u5efa\u4e00\u4e2a\u7a7a\u7684\u6570\u7ec4<\/p>\n<p>arr = []<\/p>\n<h2><strong>\u4f7f\u7528\u5217\u8868\u7684 append() \u65b9\u6cd5\u6dfb\u52a0\u5143\u7d20<\/strong><\/h2>\n<p>arr.append(1)<\/p>\n<h2><strong>\u4f7f\u7528 len() \u51fd\u6570\u83b7\u53d6\u6570\u7ec4\u7684\u957f\u5ea6<\/strong><\/h2>\n<p>length = len(arr)<\/p>\n<h2><strong>\u8f93\u51fa\u6570\u7ec4\u7684\u957f\u5ea6<\/strong><\/h2>\n<p>print(&quot;\u6570\u7ec4\u7684\u957f\u5ea6\u662f:&quot;, length)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u867d\u7136\u521d\u59cb\u6570\u7ec4<code>arr<\/code>\u662f\u7a7a\u7684\uff0c\u4f46\u901a\u8fc7<code>arr.append(1)<\/code>\u65b9\u6cd5\u5411\u6570\u7ec4\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u5143\u7d20\uff0c\u6570\u7ec4\u957f\u5ea6\u53d8\u4e3a1\u3002<\/p>\n<\/p>\n<p><h3>\u56db\u3001\u5176\u4ed6\u96c6\u5408\u7c7b\u578b\u7684\u7a7a\u68c0\u67e5<\/h3>\n<\/p>\n<p><p>\u9664\u4e86\u5217\u8868\uff0cPython\u8fd8\u652f\u6301\u5176\u4ed6\u96c6\u5408\u7c7b\u578b\uff0c\u5982\u5143\u7ec4\u3001\u96c6\u5408\u548c\u5b57\u5178\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528<code>len()<\/code>\u51fd\u6570\u6765\u68c0\u67e5\u8fd9\u4e9b\u96c6\u5408\u7c7b\u578b\u662f\u5426\u4e3a\u7a7a\u3002<\/p>\n<\/p>\n<p><h4>\u793a\u4f8b\u4ee3\u7801\uff1a<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\"># \u7a7a\u5143\u7ec4<\/p>\n<p>empty_tuple = ()<\/p>\n<p>print(&quot;\u7a7a\u5143\u7ec4\u7684\u957f\u5ea6\u662f:&quot;, len(empty_tuple))<\/p>\n<h2><strong>\u7a7a\u96c6\u5408<\/strong><\/h2>\n<p>empty_set = set()<\/p>\n<p>print(&quot;\u7a7a\u96c6\u5408\u7684\u957f\u5ea6\u662f:&quot;, len(empty_set))<\/p>\n<h2><strong>\u7a7a\u5b57\u5178<\/strong><\/h2>\n<p>empty_dict = {}<\/p>\n<p>print(&quot;\u7a7a\u5b57\u5178\u7684\u957f\u5ea6\u662f:&quot;, len(empty_dict))<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u901a\u8fc7<code>len()<\/code>\u51fd\u6570\u5206\u522b\u68c0\u67e5\u4e86\u7a7a\u5143\u7ec4\u3001\u7a7a\u96c6\u5408\u548c\u7a7a\u5b57\u5178\u7684\u957f\u5ea6\uff0c\u5b83\u4eec\u7684\u957f\u5ea6\u90fd\u662f0\u3002<\/p>\n<\/p>\n<p><h3>\u4e94\u3001\u5904\u7406\u7a7a\u6570\u7ec4\u7684\u6ce8\u610f\u4e8b\u9879<\/h3>\n<\/p>\n<p><p>\u5728\u5904\u7406\u7a7a\u6570\u7ec4\u65f6\uff0c\u6709\u4e00\u4e9b\u6ce8\u610f\u4e8b\u9879\u9700\u8981\u7262\u8bb0\uff1a<\/p>\n<\/p>\n<ol>\n<li>\n<p><strong>\u907f\u514d\u7d22\u5f15\u9519\u8bef<\/strong>\uff1a\u8bbf\u95ee\u7a7a\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u4f1a\u5bfc\u81f4\u7d22\u5f15\u9519\u8bef\u3002\u56e0\u6b64\uff0c\u5728\u8bbf\u95ee\u6570\u7ec4\u5143\u7d20\u524d\uff0c\u5e94\u8be5\u5148\u68c0\u67e5\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u3002<\/p>\n<\/p>\n<\/li>\n<li>\n<p><strong>\u521d\u59cb\u5316\u6570\u7ec4<\/strong>\uff1a\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u786e\u4fdd\u6570\u7ec4\u88ab\u6b63\u786e\u521d\u59cb\u5316\u975e\u5e38\u91cd\u8981\u3002\u5982\u679c\u6570\u7ec4\u672a\u88ab\u521d\u59cb\u5316\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4ee3\u7801\u8fd0\u884c\u65f6\u51fa\u9519\u3002<\/p>\n<\/p>\n<\/li>\n<li>\n<p><strong>\u6570\u7ec4\u7684\u7c7b\u578b<\/strong>\uff1a\u5728\u5904\u7406\u6570\u7ec4\u65f6\uff0c\u4e86\u89e3\u6570\u7ec4\u7684\u7c7b\u578b\uff08\u5217\u8868\u3001\u5143\u7ec4\u3001\u96c6\u5408\u7b49\uff09\u5bf9\u4e8e\u786e\u4fdd\u4ee3\u7801\u7684\u6b63\u786e\u6027\u975e\u5e38\u91cd\u8981\u3002<\/p>\n<\/p>\n<\/li>\n<\/ol>\n<p><h3>\u516d\u3001\u7a7a\u6570\u7ec4\u7684\u5b9e\u9645\u5e94\u7528<\/h3>\n<\/p>\n<p><p>\u7a7a\u6570\u7ec4\u5728\u5b9e\u9645\u7f16\u7a0b\u4e2d\u6709\u5f88\u591a\u5e94\u7528\u573a\u666f\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u7528\u4e8e\u6536\u96c6\u8f93\u5165\u6570\u636e\u3001\u5b58\u50a8\u4e34\u65f6\u8ba1\u7b97\u7ed3\u679c\u3001\u5b9e\u73b0\u7279\u5b9a\u7b97\u6cd5\u7b49\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528\u7a7a\u6570\u7ec4\u6765\u6536\u96c6\u7528\u6237\u8f93\u5165\u7684\u6570\u636e\uff1a<\/p>\n<\/p>\n<p><h4>\u793a\u4f8b\u4ee3\u7801\uff1a<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\"># \u521b\u5efa\u4e00\u4e2a\u7a7a\u7684\u6570\u7ec4\u7528\u4e8e\u5b58\u50a8\u7528\u6237\u8f93\u5165\u7684\u6570\u636e<\/p>\n<p>user_data = []<\/p>\n<h2><strong>\u6536\u96c6\u7528\u6237\u8f93\u5165\u7684\u6570\u636e<\/strong><\/h2>\n<p>while True:<\/p>\n<p>    data = input(&quot;\u8bf7\u8f93\u5165\u6570\u636e\uff08\u8f93\u5165&#39;q&#39;\u9000\u51fa\uff09\uff1a&quot;)<\/p>\n<p>    if data.lower() == &#39;q&#39;:<\/p>\n<p>        break<\/p>\n<p>    user_data.append(data)<\/p>\n<h2><strong>\u8f93\u51fa\u6536\u96c6\u5230\u7684\u6570\u636e<\/strong><\/h2>\n<p>print(&quot;\u6536\u96c6\u5230\u7684\u6570\u636e\u662f:&quot;, user_data)<\/p>\n<p>print(&quot;\u6570\u636e\u7684\u957f\u5ea6\u662f:&quot;, len(user_data))<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u901a\u8fc7\u4e00\u4e2a\u5faa\u73af\u6765\u6536\u96c6\u7528\u6237\u8f93\u5165\u7684\u6570\u636e\uff0c\u5e76\u5c06\u6570\u636e\u5b58\u50a8\u5728\u7a7a\u6570\u7ec4<code>user_data<\/code>\u4e2d\u3002\u7528\u6237\u53ef\u4ee5\u901a\u8fc7\u8f93\u5165&#39;q&#39;\u6765\u9000\u51fa\u5faa\u73af\uff0c\u6700\u7ec8\u8f93\u51fa\u6536\u96c6\u5230\u7684\u6570\u636e\u53ca\u5176\u957f\u5ea6\u3002<\/p>\n<\/p>\n<p><h3>\u4e03\u3001\u4f7f\u7528NumPy\u5904\u7406\u7a7a\u6570\u7ec4<\/h3>\n<\/p>\n<p><p>NumPy\u662f\u4e00\u4e2a\u5f3a\u5927\u7684\u6570\u503c\u8ba1\u7b97\u5e93\uff0c\u5b83\u63d0\u4f9b\u4e86\u591a\u79cd\u6570\u7ec4\u64cd\u4f5c\u65b9\u6cd5\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528NumPy\u521b\u5efa\u548c\u5904\u7406\u7a7a\u6570\u7ec4\u3002<\/p>\n<\/p>\n<p><h4>\u793a\u4f8b\u4ee3\u7801\uff1a<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">import numpy as np<\/p>\n<h2><strong>\u521b\u5efa\u4e00\u4e2a\u7a7a\u7684NumPy\u6570\u7ec4<\/strong><\/h2>\n<p>empty_array = np.array([])<\/p>\n<h2><strong>\u83b7\u53d6NumPy\u6570\u7ec4\u7684\u957f\u5ea6<\/strong><\/h2>\n<p>length = empty_array.size<\/p>\n<h2><strong>\u8f93\u51faNumPy\u6570\u7ec4\u7684\u957f\u5ea6<\/strong><\/h2>\n<p>print(&quot;NumPy\u7a7a\u6570\u7ec4\u7684\u957f\u5ea6\u662f:&quot;, length)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u4f7f\u7528<code>np.array([])<\/code>\u521b\u5efa\u4e86\u4e00\u4e2a\u7a7a\u7684NumPy\u6570\u7ec4\uff0c\u5e76\u901a\u8fc7<code>empty_array.size<\/code>\u83b7\u53d6\u6570\u7ec4\u7684\u957f\u5ea6\u3002<\/p>\n<\/p>\n<p><h3>\u516b\u3001\u603b\u7ed3<\/h3>\n<\/p>\n<p><p>\u5728Python\u4e2d\uff0c\u83b7\u53d6\u7a7a\u6570\u7ec4\u7684\u957f\u5ea6\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528<code>len()<\/code>\u51fd\u6570\u6765\u5b9e\u73b0\uff0c\u8fd4\u56de\u503c\u4e3a0\u3002\u6b64\u5916\uff0c\u53ef\u4ee5\u901a\u8fc7\u68c0\u67e5\u6570\u7ec4\u957f\u5ea6\u662f\u5426\u4e3a0\u6765\u786e\u8ba4\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u3002\u4e86\u89e3\u5982\u4f55\u5904\u7406\u548c\u68c0\u67e5\u7a7a\u6570\u7ec4\u5728\u7f16\u7a0b\u4e2d\u975e\u5e38\u91cd\u8981\uff0c\u6709\u52a9\u4e8e\u7f16\u5199\u5065\u58ee\u7684\u4ee3\u7801\u3002\u901a\u8fc7\u672c\u6587\u6240\u8ff0\u7684\u5404\u79cd\u65b9\u6cd5\u548c\u6ce8\u610f\u4e8b\u9879\uff0c\u5e0c\u671b\u80fd\u591f\u5e2e\u52a9\u8bfb\u8005\u66f4\u597d\u5730\u7406\u89e3\u548c\u5904\u7406\u7a7a\u6570\u7ec4\u7684\u957f\u5ea6\u95ee\u9898\u3002<\/p>\n<\/p>\n<p><h3>\u4e5d\u3001\u8fdb\u9636\uff1a\u5229\u7528Python\u5e93\u5904\u7406\u7a7a\u6570\u7ec4<\/h3>\n<\/p>\n<p><p>\u9664\u4e86NumPy\uff0cPython\u8fd8\u6709\u5176\u4ed6\u5e93\u53ef\u4ee5\u5e2e\u52a9\u5904\u7406\u6570\u7ec4\u548c\u96c6\u5408\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u5e93\u53ca\u5176\u5904\u7406\u7a7a\u6570\u7ec4\u7684\u65b9\u6cd5\u3002<\/p>\n<\/p>\n<p><h4>1\u3001Pandas<\/h4>\n<\/p>\n<p><p>Pandas\u662f\u4e00\u4e2a\u6570\u636e\u5904\u7406\u548c\u5206\u6790\u5e93\uff0c\u5e7f\u6cdb\u7528\u4e8e\u6570\u636e\u79d1\u5b66\u548c\u6570\u636e\u5206\u6790\u3002Pandas\u7684Series\u548cDataFrame\u5bf9\u8c61\u53ef\u4ee5\u7528\u4e8e\u5904\u7406\u7a7a\u6570\u7ec4\u3002<\/p>\n<\/p>\n<p><h4>\u793a\u4f8b\u4ee3\u7801\uff1a<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">import pandas as pd<\/p>\n<h2><strong>\u521b\u5efa\u4e00\u4e2a\u7a7a\u7684DataFrame<\/strong><\/h2>\n<p>empty_df = pd.DataFrame()<\/p>\n<h2><strong>\u83b7\u53d6DataFrame\u7684\u5f62\u72b6<\/strong><\/h2>\n<p>shape = empty_df.shape<\/p>\n<h2><strong>\u8f93\u51faDataFrame\u7684\u5f62\u72b6<\/strong><\/h2>\n<p>print(&quot;\u7a7aDataFrame\u7684\u5f62\u72b6\u662f:&quot;, shape)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u521b\u5efa\u4e86\u4e00\u4e2a\u7a7a\u7684DataFrame\u5bf9\u8c61\uff0c\u5e76\u901a\u8fc7<code>empty_df.shape<\/code>\u83b7\u53d6\u5176\u5f62\u72b6\u3002<\/p>\n<\/p>\n<p><h4>2\u3001SciPy<\/h4>\n<\/p>\n<p><p>SciPy\u662f\u4e00\u4e2a\u7528\u4e8e\u79d1\u5b66\u548c\u5de5\u7a0b\u8ba1\u7b97\u7684\u5e93\uff0c\u63d0\u4f9b\u4e86\u8bb8\u591a\u9ad8\u7ea7\u6570\u5b66\u51fd\u6570\u3002SciPy\u7684\u7a00\u758f\u77e9\u9635\u6a21\u5757\u53ef\u4ee5\u5904\u7406\u7a7a\u7684\u7a00\u758f\u77e9\u9635\u3002<\/p>\n<\/p>\n<p><h4>\u793a\u4f8b\u4ee3\u7801\uff1a<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">from scipy.sparse import csr_matrix<\/p>\n<h2><strong>\u521b\u5efa\u4e00\u4e2a\u7a7a\u7684\u7a00\u758f\u77e9\u9635<\/strong><\/h2>\n<p>empty_sparse_matrix = csr_matrix((0, 0))<\/p>\n<h2><strong>\u83b7\u53d6\u7a00\u758f\u77e9\u9635\u7684\u5f62\u72b6<\/strong><\/h2>\n<p>shape = empty_sparse_matrix.shape<\/p>\n<h2><strong>\u8f93\u51fa\u7a00\u758f\u77e9\u9635\u7684\u5f62\u72b6<\/strong><\/h2>\n<p>print(&quot;\u7a7a\u7a00\u758f\u77e9\u9635\u7684\u5f62\u72b6\u662f:&quot;, shape)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u521b\u5efa\u4e86\u4e00\u4e2a\u7a7a\u7684\u7a00\u758f\u77e9\u9635\uff0c\u5e76\u901a\u8fc7<code>empty_sparse_matrix.shape<\/code>\u83b7\u53d6\u5176\u5f62\u72b6\u3002<\/p>\n<\/p>\n<p><h4>3\u3001TensorFlow<\/h4>\n<\/p>\n<p><p>TensorFlow\u662f\u4e00\u4e2a\u7528\u4e8e<a href=\"https:\/\/docs.pingcode.com\/ask\/59192.html\" target=\"_blank\">\u673a\u5668\u5b66\u4e60<\/a>\u548c\u6df1\u5ea6\u5b66\u4e60\u7684\u5f00\u6e90\u5e93\uff0c\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u5f20\u91cf\u64cd\u4f5c\u51fd\u6570\u3002\u53ef\u4ee5\u4f7f\u7528TensorFlow\u521b\u5efa\u548c\u5904\u7406\u7a7a\u7684\u5f20\u91cf\u3002<\/p>\n<\/p>\n<p><h4>\u793a\u4f8b\u4ee3\u7801\uff1a<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">import tensorflow as tf<\/p>\n<h2><strong>\u521b\u5efa\u4e00\u4e2a\u7a7a\u7684\u5f20\u91cf<\/strong><\/h2>\n<p>empty_tensor = tf.constant([])<\/p>\n<h2><strong>\u83b7\u53d6\u5f20\u91cf\u7684\u5f62\u72b6<\/strong><\/h2>\n<p>shape = empty_tensor.shape<\/p>\n<h2><strong>\u8f93\u51fa\u5f20\u91cf\u7684\u5f62\u72b6<\/strong><\/h2>\n<p>print(&quot;\u7a7a\u5f20\u91cf\u7684\u5f62\u72b6\u662f:&quot;, shape)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u4f7f\u7528<code>tf.constant([])<\/code>\u521b\u5efa\u4e86\u4e00\u4e2a\u7a7a\u7684\u5f20\u91cf\uff0c\u5e76\u901a\u8fc7<code>empty_tensor.shape<\/code>\u83b7\u53d6\u5176\u5f62\u72b6\u3002<\/p>\n<\/p>\n<p><h3>\u5341\u3001\u5b9e\u8df5\u4e2d\u7684\u5e38\u89c1\u95ee\u9898\u53ca\u89e3\u51b3\u65b9\u6848<\/h3>\n<\/p>\n<p><p>\u5728\u5904\u7406\u7a7a\u6570\u7ec4\u7684\u8fc7\u7a0b\u4e2d\uff0c\u53ef\u80fd\u4f1a\u9047\u5230\u4e00\u4e9b\u5e38\u89c1\u95ee\u9898\u3002\u4ee5\u4e0b\u662f\u51e0\u4e2a\u5e38\u89c1\u95ee\u9898\u53ca\u5176\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<\/p>\n<p><h4>1\u3001\u7d22\u5f15\u9519\u8bef<\/h4>\n<\/p>\n<p><p>\u5f53\u5c1d\u8bd5\u8bbf\u95ee\u7a7a\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u65f6\uff0c\u4f1a\u53d1\u751f\u7d22\u5f15\u9519\u8bef\u3002\u89e3\u51b3\u65b9\u6848\u662f\u5148\u68c0\u67e5\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\uff0c\u518d\u8bbf\u95ee\u5176\u5143\u7d20\u3002<\/p>\n<\/p>\n<p><h4>\u793a\u4f8b\u4ee3\u7801\uff1a<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\"># \u521b\u5efa\u4e00\u4e2a\u7a7a\u7684\u6570\u7ec4<\/p>\n<p>arr = []<\/p>\n<h2><strong>\u68c0\u67e5\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a<\/strong><\/h2>\n<p>if len(arr) == 0:<\/p>\n<p>    print(&quot;\u6570\u7ec4\u662f\u7a7a\u7684\uff0c\u65e0\u6cd5\u8bbf\u95ee\u5143\u7d20&quot;)<\/p>\n<p>else:<\/p>\n<p>    print(&quot;\u6570\u7ec4\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\u662f:&quot;, arr[0])<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2\u3001\u672a\u521d\u59cb\u5316\u7684\u6570\u7ec4<\/h4>\n<\/p>\n<p><p>\u5982\u679c\u6570\u7ec4\u672a\u88ab\u6b63\u786e\u521d\u59cb\u5316\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4ee3\u7801\u8fd0\u884c\u65f6\u51fa\u9519\u3002\u786e\u4fdd\u6570\u7ec4\u5728\u4f7f\u7528\u524d\u5df2\u88ab\u521d\u59cb\u5316\u3002<\/p>\n<\/p>\n<p><h4>\u793a\u4f8b\u4ee3\u7801\uff1a<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\"># \u521d\u59cb\u5316\u6570\u7ec4<\/p>\n<p>arr = []<\/p>\n<h2><strong>\u5411\u6570\u7ec4\u4e2d\u6dfb\u52a0\u5143\u7d20<\/strong><\/h2>\n<p>arr.append(1)<\/p>\n<h2><strong>\u8f93\u51fa\u6570\u7ec4\u7684\u957f\u5ea6<\/strong><\/h2>\n<p>print(&quot;\u6570\u7ec4\u7684\u957f\u5ea6\u662f:&quot;, len(arr))<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>3\u3001\u6570\u636e\u7c7b\u578b\u4e0d\u4e00\u81f4<\/h4>\n<\/p>\n<p><p>\u5728\u5904\u7406\u6570\u7ec4\u65f6\uff0c\u786e\u4fdd\u6570\u7ec4\u4e2d\u7684\u6570\u636e\u7c7b\u578b\u4e00\u81f4\uff0c\u4ee5\u907f\u514d\u7c7b\u578b\u9519\u8bef\u3002<\/p>\n<\/p>\n<p><h4>\u793a\u4f8b\u4ee3\u7801\uff1a<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\"># \u521b\u5efa\u4e00\u4e2a\u6570\u7ec4<\/p>\n<p>arr = [1, 2, 3]<\/p>\n<h2><strong>\u5411\u6570\u7ec4\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u5b57\u7b26\u4e32\u5143\u7d20\uff08\u53ef\u80fd\u5bfc\u81f4\u7c7b\u578b\u9519\u8bef\uff09<\/strong><\/h2>\n<p>arr.append(&quot;four&quot;)<\/p>\n<h2><strong>\u8f93\u51fa\u6570\u7ec4\u7684\u5185\u5bb9<\/strong><\/h2>\n<p>print(&quot;\u6570\u7ec4\u7684\u5185\u5bb9\u662f:&quot;, arr)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u5411\u6570\u7ec4\u4e2d\u6dfb\u52a0\u4e86\u4e00\u4e2a\u5b57\u7b26\u4e32\u5143\u7d20\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u7c7b\u578b\u9519\u8bef\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u786e\u4fdd\u6570\u7ec4\u4e2d\u7684\u6570\u636e\u7c7b\u578b\u4e00\u81f4\u975e\u5e38\u91cd\u8981\u3002<\/p>\n<\/p>\n<p><h3>\u603b\u7ed3<\/h3>\n<\/p>\n<p><p>\u672c\u6587\u8be6\u7ec6\u4ecb\u7ecd\u4e86\u5982\u4f55\u5728Python\u4e2d\u83b7\u53d6\u7a7a\u6570\u7ec4\u7684\u957f\u5ea6\uff0c\u5e76\u63a2\u8ba8\u4e86\u76f8\u5173\u7684\u591a\u79cd\u65b9\u6cd5\u548c\u6ce8\u610f\u4e8b\u9879\u3002\u901a\u8fc7\u4f7f\u7528<code>len()<\/code>\u51fd\u6570\u3001\u68c0\u67e5\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u3001\u5229\u7528\u6570\u7ec4\u7684\u65b9\u6cd5\u4ee5\u53ca\u4f7f\u7528\u9ad8\u7ea7\u5e93\uff08\u5982NumPy\u3001Pandas\u3001SciPy\u548cTensorFlow\uff09\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u5904\u7406\u548c\u68c0\u67e5\u7a7a\u6570\u7ec4\u3002\u5e0c\u671b\u672c\u6587\u5185\u5bb9\u5bf9\u8bfb\u8005\u5728\u5b9e\u9645\u7f16\u7a0b\u4e2d\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p> <strong>\u5982\u4f55\u5728Python\u4e2d\u521b\u5efa\u4e00\u4e2a\u7a7a\u6570\u7ec4\u5e76\u68c0\u67e5\u5176\u957f\u5ea6\uff1f<\/strong><br \/>\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u5217\u8868\u6765\u521b\u5efa\u4e00\u4e2a\u7a7a\u6570\u7ec4\uff0c\u65b9\u6cd5\u662f\u7b80\u5355\u5730\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u7684\u5217\u8868\uff0c\u4f8b\u5982\uff1a<code>empty_array = []<\/code>\u3002\u8981\u68c0\u67e5\u8fd9\u4e2a\u7a7a\u6570\u7ec4\u7684\u957f\u5ea6\uff0c\u53ef\u4ee5\u4f7f\u7528\u5185\u7f6e\u7684<code>len()<\/code>\u51fd\u6570\uff0c\u50cf\u8fd9\u6837\uff1a<code>length = len(empty_array)<\/code>\u3002\u6b64\u65f6\uff0c<code>length<\/code>\u5c06\u8fd4\u56de0\uff0c\u56e0\u4e3a\u6570\u7ec4\u4e2d\u6ca1\u6709\u4efb\u4f55\u5143\u7d20\u3002<\/p>\n<p><strong>\u7a7a\u6570\u7ec4\u5728Python\u4e2d\u80fd\u5b58\u50a8\u54ea\u4e9b\u7c7b\u578b\u7684\u6570\u636e\uff1f<\/strong><br \/>\u867d\u7136\u7a7a\u6570\u7ec4\u5728\u521d\u59cb\u5316\u65f6\u6ca1\u6709\u5143\u7d20\uff0c\u4f46\u53ef\u4ee5\u5728\u4e4b\u540e\u7684\u64cd\u4f5c\u4e2d\u5b58\u50a8\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u636e\uff0c\u5305\u62ec\u6574\u6570\u3001\u5b57\u7b26\u4e32\u3001\u6d6e\u70b9\u6570\u3001\u5e03\u5c14\u503c\u7b49\u3002\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u901a\u8fc7<code>empty_array.append(5)<\/code>\u5c06\u6574\u6570\u6dfb\u52a0\u5230\u6570\u7ec4\u4e2d\uff0c\u6216\u8005\u901a\u8fc7<code>empty_array.append(&quot;Hello&quot;)<\/code>\u6dfb\u52a0\u5b57\u7b26\u4e32\u3002Python\u7684\u52a8\u6001\u7c7b\u578b\u7279\u6027\u4f7f\u5f97\u6570\u7ec4\u53ef\u4ee5\u7075\u6d3b\u5730\u5b58\u50a8\u5404\u79cd\u6570\u636e\u7c7b\u578b\u3002<\/p>\n<p><strong>\u5982\u4f55\u5728Python\u4e2d\u52a8\u6001\u5730\u6dfb\u52a0\u5143\u7d20\u5230\u7a7a\u6570\u7ec4\u4e2d\uff1f<\/strong><br \/>\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528<code>append()<\/code>\u65b9\u6cd5\u52a8\u6001\u5730\u5c06\u5143\u7d20\u6dfb\u52a0\u5230\u7a7a\u6570\u7ec4\u4e2d\u3002\u4f8b\u5982\uff0c\u9996\u5148\u521b\u5efa\u4e00\u4e2a\u7a7a\u6570\u7ec4<code>empty_array = []<\/code>\uff0c\u7136\u540e\u4f7f\u7528<code>empty_array.append(1)<\/code>\u5c06\u6570\u5b571\u6dfb\u52a0\u5230\u6570\u7ec4\u4e2d\u3002\u53ef\u4ee5\u91cd\u590d\u8c03\u7528<code>append()<\/code>\u65b9\u6cd5\u6765\u6dfb\u52a0\u66f4\u591a\u7684\u5143\u7d20\uff0c\u65e0\u8bba\u662f\u6570\u5b57\u3001\u5b57\u7b26\u4e32\u8fd8\u662f\u5176\u4ed6\u5bf9\u8c61\uff0c\u6570\u7ec4\u4f1a\u81ea\u52a8\u8c03\u6574\u5176\u957f\u5ea6\u4ee5\u9002\u5e94\u65b0\u6dfb\u52a0\u7684\u5143\u7d20\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0c\u83b7\u53d6\u7a7a\u6570\u7ec4\u7684\u957f\u5ea6\u53ef\u4ee5\u4f7f\u7528len()\u51fd\u6570\u3001\u68c0\u67e5\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u3001\u4f7f\u7528\u6570\u7ec4\u7684\u65b9\u6cd5\u3002\u4ee5\u4e0b\u662f\u5bf9\u5176\u4e2d\u4e00\u79cd\u65b9 [&hellip;]","protected":false},"author":3,"featured_media":1034875,"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\/1034860"}],"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=1034860"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1034860\/revisions"}],"predecessor-version":[{"id":1034878,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1034860\/revisions\/1034878"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1034875"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1034860"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1034860"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1034860"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}