{"id":1130444,"date":"2025-01-08T20:40:05","date_gmt":"2025-01-08T12:40:05","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1130444.html"},"modified":"2025-01-08T20:40:08","modified_gmt":"2025-01-08T12:40:08","slug":"python%e4%b8%ad%e5%a6%82%e4%bd%95%e5%ae%9a%e4%b9%89%e4%b8%80%e4%b8%aa%e7%a9%ba%e7%9a%84%e5%8f%98%e9%87%8f","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1130444.html","title":{"rendered":"python\u4e2d\u5982\u4f55\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u7684\u53d8\u91cf"},"content":{"rendered":"<p style=\"text-align:center;\" ><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/25100531\/b7fff5c7-c529-4ba9-abd7-32ed1acd649c.webp\" alt=\"python\u4e2d\u5982\u4f55\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u7684\u53d8\u91cf\" \/><\/p>\n<p><p> <strong>\u5728Python\u4e2d\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u7684\u53d8\u91cf\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u5b8c\u6210\uff0c\u5305\u62ec\u4f7f\u7528<code>None<\/code>\u3001\u7a7a\u5b57\u7b26\u4e32<code>&quot;&quot;<\/code>\u3001\u7a7a\u5217\u8868<code>[]<\/code>\u3001\u7a7a\u5b57\u5178<code>{}<\/code>\u7b49\u3002\u8fd9\u4e9b\u65b9\u6cd5\u5404\u6709\u5176\u9002\u7528\u573a\u666f\uff0c\u5177\u4f53\u9009\u62e9\u5e94\u6839\u636e\u53d8\u91cf\u7684\u9884\u671f\u7528\u9014\u800c\u5b9a\u3002<\/strong> \u5728\u5b9e\u9645\u7f16\u7a0b\u4e2d\uff0c\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u662f\u5c06\u53d8\u91cf\u521d\u59cb\u5316\u4e3a<code>None<\/code>\uff0c\u8fd9\u8868\u793a\u53d8\u91cf\u76ee\u524d\u6ca1\u6709\u4efb\u4f55\u503c\u3002<\/p>\n<\/p>\n<p><p>\u4e0b\u9762\u6211\u4eec\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u4e0d\u540c\u7684\u65b9\u6cd5\u53ca\u5176\u9002\u7528\u573a\u666f\uff1a<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u4f7f\u7528None<\/h3>\n<\/p>\n<p><p><code>None<\/code>\u662fPython\u4e2d\u7684\u4e00\u4e2a\u7279\u6b8a\u5e38\u91cf\uff0c\u8868\u793a\u201c\u6ca1\u6709\u503c\u201d\u6216\u8005\u201c\u7a7a\u503c\u201d\u3002\u5b83\u5e38\u7528\u4e8e\u521d\u59cb\u5316\u53d8\u91cf\uff0c\u8868\u793a\u8be5\u53d8\u91cf\u76ee\u524d\u8fd8\u6ca1\u6709\u88ab\u8d4b\u503c\u3002<\/p>\n<\/p>\n<p><h4>\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">my_var = None<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>\u9002\u7528\u573a\u666f\uff1a<\/h4>\n<\/p>\n<ol>\n<li><strong>\u521d\u59cb\u5316\u53d8\u91cf<\/strong>\uff1a\u5728\u7a0b\u5e8f\u5f00\u59cb\u65f6\uff0c\u4f7f\u7528<code>None<\/code>\u521d\u59cb\u5316\u53d8\u91cf\uff0c\u907f\u514d\u672a\u5b9a\u4e49\u53d8\u91cf\u7684\u9519\u8bef\u3002<\/li>\n<li><strong>\u9ed8\u8ba4\u53c2\u6570<\/strong>\uff1a\u5728\u51fd\u6570\u5b9a\u4e49\u4e2d\uff0c\u4f7f\u7528<code>None<\/code>\u4f5c\u4e3a\u9ed8\u8ba4\u53c2\u6570\u503c\uff0c\u8868\u793a\u53c2\u6570\u53ef\u9009\u3002<\/li>\n<li><strong>\u6761\u4ef6\u5224\u65ad<\/strong>\uff1a\u5728\u9700\u8981\u68c0\u67e5\u53d8\u91cf\u662f\u5426\u88ab\u8d4b\u503c\u7684\u5730\u65b9\uff0c\u901a\u8fc7\u5224\u65ad\u662f\u5426\u4e3a<code>None<\/code>\u6765\u51b3\u5b9a\u4e0b\u4e00\u6b65\u64cd\u4f5c\u3002<\/li>\n<\/ol>\n<p><p><strong>\u8be6\u7ec6\u63cf\u8ff0\uff1a<\/strong><\/p>\n<p>\u4f7f\u7528<code>None<\/code>\u521d\u59cb\u5316\u53d8\u91cf\u7684\u4e00\u4e2a\u5178\u578b\u573a\u666f\u662f\u6761\u4ef6\u5224\u65ad\u3002\u4f8b\u5982\uff0c\u5728\u7f16\u5199\u4e00\u4e2a\u51fd\u6570\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528<code>None<\/code>\u4f5c\u4e3a\u9ed8\u8ba4\u53c2\u6570\u503c\uff0c\u7136\u540e\u5728\u51fd\u6570\u5185\u90e8\u68c0\u67e5\u53c2\u6570\u662f\u5426\u4e3a<code>None<\/code>\uff0c\u4ece\u800c\u51b3\u5b9a\u662f\u5426\u8fdb\u884c\u7279\u5b9a\u64cd\u4f5c\u3002\u8fd9\u4e0d\u4ec5\u4f7f\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\uff0c\u8fd8\u63d0\u5347\u4e86\u7a0b\u5e8f\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">def process_data(data=None):<\/p>\n<p>    if data is None:<\/p>\n<p>        data = get_default_data()<\/p>\n<p>    # \u7ee7\u7eed\u5904\u7406\u6570\u636e<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e8c\u3001\u4f7f\u7528\u7a7a\u5b57\u7b26\u4e32<code>&quot;&quot;<\/code><\/h3>\n<\/p>\n<p><p>\u7a7a\u5b57\u7b26\u4e32\u662f\u4e00\u4e2a\u957f\u5ea6\u4e3a\u96f6\u7684\u5b57\u7b26\u4e32\uff0c\u901a\u5e38\u7528\u4e8e\u8868\u793a\u6587\u672c\u6570\u636e\u7684\u521d\u59cb\u72b6\u6001\u3002<\/p>\n<\/p>\n<p><h4>\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">my_string = &quot;&quot;<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>\u9002\u7528\u573a\u666f\uff1a<\/h4>\n<\/p>\n<ol>\n<li><strong>\u6587\u672c\u5904\u7406<\/strong>\uff1a\u5728\u9700\u8981\u5904\u7406\u5927\u91cf\u5b57\u7b26\u4e32\u7684\u7a0b\u5e8f\u4e2d\uff0c\u4f7f\u7528\u7a7a\u5b57\u7b26\u4e32\u521d\u59cb\u5316\u53d8\u91cf\u3002<\/li>\n<li><strong>\u62fc\u63a5\u5b57\u7b26\u4e32<\/strong>\uff1a\u5728\u5faa\u73af\u4e2d\u62fc\u63a5\u5b57\u7b26\u4e32\u65f6\uff0c\u4f7f\u7528\u7a7a\u5b57\u7b26\u4e32\u4f5c\u4e3a\u521d\u59cb\u503c\u3002<\/li>\n<\/ol>\n<p><h3>\u4e09\u3001\u4f7f\u7528\u7a7a\u5217\u8868<code>[]<\/code><\/h3>\n<\/p>\n<p><p>\u7a7a\u5217\u8868\u662f\u4e00\u79cd\u957f\u5ea6\u4e3a\u96f6\u7684\u5217\u8868\uff0c\u9002\u7528\u4e8e\u521d\u59cb\u5316\u9700\u8981\u5b58\u50a8\u591a\u4e2a\u5143\u7d20\u7684\u53d8\u91cf\u3002<\/p>\n<\/p>\n<p><h4>\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">my_list = []<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>\u9002\u7528\u573a\u666f\uff1a<\/h4>\n<\/p>\n<ol>\n<li><strong>\u52a8\u6001\u6570\u7ec4<\/strong>\uff1a\u5728\u9700\u8981\u52a8\u6001\u589e\u52a0\u5143\u7d20\u7684\u573a\u666f\u4e2d\u4f7f\u7528\u7a7a\u5217\u8868\u521d\u59cb\u5316\u53d8\u91cf\u3002<\/li>\n<li><strong>\u6536\u96c6\u6570\u636e<\/strong>\uff1a\u5728\u5faa\u73af\u4e2d\u6536\u96c6\u6570\u636e\u5e76\u5b58\u50a8\u5728\u5217\u8868\u4e2d\u3002<\/li>\n<\/ol>\n<p><h3>\u56db\u3001\u4f7f\u7528\u7a7a\u5b57\u5178<code>{}<\/code><\/h3>\n<\/p>\n<p><p>\u7a7a\u5b57\u5178\u662f\u4e00\u79cd\u957f\u5ea6\u4e3a\u96f6\u7684\u5b57\u5178\uff0c\u9002\u7528\u4e8e\u521d\u59cb\u5316\u9700\u8981\u5b58\u50a8\u952e\u503c\u5bf9\u7684\u53d8\u91cf\u3002<\/p>\n<\/p>\n<p><h4>\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">my_dict = {}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>\u9002\u7528\u573a\u666f\uff1a<\/h4>\n<\/p>\n<ol>\n<li><strong>\u6620\u5c04\u5173\u7cfb<\/strong>\uff1a\u5728\u9700\u8981\u5b58\u50a8\u952e\u503c\u5bf9\u7684\u573a\u666f\u4e2d\u4f7f\u7528\u7a7a\u5b57\u5178\u521d\u59cb\u5316\u53d8\u91cf\u3002<\/li>\n<li><strong>\u7edf\u8ba1\u6570\u636e<\/strong>\uff1a\u5728\u5faa\u73af\u4e2d\u7edf\u8ba1\u6570\u636e\u5e76\u5b58\u50a8\u5728\u5b57\u5178\u4e2d\u3002<\/li>\n<\/ol>\n<p><h3>\u4e94\u3001\u4f7f\u7528\u7a7a\u96c6\u5408<code>set()<\/code><\/h3>\n<\/p>\n<p><p>\u7a7a\u96c6\u5408\u662f\u4e00\u79cd\u957f\u5ea6\u4e3a\u96f6\u7684\u96c6\u5408\uff0c\u9002\u7528\u4e8e\u521d\u59cb\u5316\u9700\u8981\u5b58\u50a8\u552f\u4e00\u5143\u7d20\u7684\u53d8\u91cf\u3002<\/p>\n<\/p>\n<p><h4>\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">my_set = set()<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>\u9002\u7528\u573a\u666f\uff1a<\/h4>\n<\/p>\n<ol>\n<li><strong>\u552f\u4e00\u5143\u7d20\u96c6\u5408<\/strong>\uff1a\u5728\u9700\u8981\u5b58\u50a8\u552f\u4e00\u5143\u7d20\u7684\u573a\u666f\u4e2d\u4f7f\u7528\u7a7a\u96c6\u5408\u521d\u59cb\u5316\u53d8\u91cf\u3002<\/li>\n<li><strong>\u96c6\u5408\u8fd0\u7b97<\/strong>\uff1a\u5728\u9700\u8981\u8fdb\u884c\u96c6\u5408\u8fd0\u7b97\u7684\u573a\u666f\u4e2d\u4f7f\u7528\u7a7a\u96c6\u5408\u3002<\/li>\n<\/ol>\n<p><h3>\u516d\u3001\u4f7f\u7528\u7a7a\u5143\u7ec4<code>()<\/code><\/h3>\n<\/p>\n<p><p>\u7a7a\u5143\u7ec4\u662f\u4e00\u79cd\u957f\u5ea6\u4e3a\u96f6\u7684\u5143\u7ec4\uff0c\u9002\u7528\u4e8e\u521d\u59cb\u5316\u9700\u8981\u5b58\u50a8\u4e0d\u53ef\u53d8\u5143\u7d20\u7684\u53d8\u91cf\u3002<\/p>\n<\/p>\n<p><h4>\u793a\u4f8b\uff1a<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">my_tuple = ()<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>\u9002\u7528\u573a\u666f\uff1a<\/h4>\n<\/p>\n<ol>\n<li><strong>\u4e0d\u53ef\u53d8\u96c6\u5408<\/strong>\uff1a\u5728\u9700\u8981\u5b58\u50a8\u4e0d\u53ef\u53d8\u5143\u7d20\u7684\u573a\u666f\u4e2d\u4f7f\u7528\u7a7a\u5143\u7ec4\u521d\u59cb\u5316\u53d8\u91cf\u3002<\/li>\n<li><strong>\u56fa\u5b9a\u7ed3\u6784<\/strong>\uff1a\u5728\u9700\u8981\u5b58\u50a8\u56fa\u5b9a\u7ed3\u6784\u7684\u6570\u636e\u7684\u573a\u666f\u4e2d\u4f7f\u7528\u7a7a\u5143\u7ec4\u3002<\/li>\n<\/ol>\n<p><h3>\u603b\u7ed3<\/h3>\n<\/p>\n<p><p>\u5728Python\u4e2d\uff0c\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u7684\u53d8\u91cf\u6709\u591a\u79cd\u65b9\u6cd5\uff0c\u6bcf\u79cd\u65b9\u6cd5\u90fd\u6709\u5176\u9002\u7528\u7684\u573a\u666f\u548c\u4f18\u7f3a\u70b9\u3002<strong>\u4f7f\u7528<code>None<\/code>\u3001\u7a7a\u5b57\u7b26\u4e32<code>&quot;&quot;<\/code>\u3001\u7a7a\u5217\u8868<code>[]<\/code>\u3001\u7a7a\u5b57\u5178<code>{}<\/code>\u7b49\u65b9\u6cd5\u521d\u59cb\u5316\u53d8\u91cf\uff0c\u53ef\u4ee5\u5e2e\u52a9\u7a0b\u5e8f\u5458\u66f4\u597d\u5730\u7ba1\u7406\u548c\u4f7f\u7528\u53d8\u91cf\uff0c\u907f\u514d\u672a\u5b9a\u4e49\u53d8\u91cf\u7684\u9519\u8bef\uff0c\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/strong> \u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u521d\u59cb\u5316\u53d8\u91cf\uff0c\u4e0d\u4ec5\u53ef\u4ee5\u63d0\u9ad8\u7a0b\u5e8f\u7684\u6027\u80fd\uff0c\u8fd8\u53ef\u4ee5\u51cf\u5c11\u6f5c\u5728\u7684\u9519\u8bef\uff0c\u4f7f\u4ee3\u7801\u66f4\u52a0\u5065\u58ee\u548c\u53ef\u9760\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\u53d8\u91cf\uff1f<\/strong><br \/>\u5728Python\u4e2d\uff0c\u521b\u5efa\u4e00\u4e2a\u7a7a\u53d8\u91cf\u53ef\u4ee5\u901a\u8fc7\u8d4b\u503c\u7ed9<code>None<\/code>\u5b9e\u73b0\u3002<code>None<\/code>\u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u5e38\u91cf\uff0c\u8868\u793a\u53d8\u91cf\u4e0d\u6307\u5411\u4efb\u4f55\u5bf9\u8c61\u6216\u503c\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a  <\/p>\n<pre><code class=\"language-python\">empty_variable = None\n<\/code><\/pre>\n<p><strong>\u7a7a\u53d8\u91cf\u5728Python\u4e2d\u6709\u4ec0\u4e48\u5b9e\u9645\u5e94\u7528\uff1f<\/strong><br \/>\u7a7a\u53d8\u91cf\u901a\u5e38\u7528\u4e8e\u5360\u4f4d\u7b26\uff0c\u8868\u793a\u67d0\u4e2a\u503c\u5c1a\u672a\u786e\u5b9a\u6216\u9700\u8981\u5728\u540e\u7eed\u4ee3\u7801\u4e2d\u8fdb\u884c\u8d4b\u503c\u3002\u5728\u6761\u4ef6\u5224\u65ad\u6216\u5faa\u73af\u4e2d\uff0c\u4f7f\u7528\u7a7a\u53d8\u91cf\u53ef\u4ee5\u5e2e\u52a9\u8fdb\u884c\u903b\u8f91\u63a7\u5236\uff0c\u786e\u4fdd\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n<p><strong>\u5982\u4f55\u68c0\u67e5\u4e00\u4e2a\u53d8\u91cf\u662f\u5426\u4e3a\u7a7a\uff1f<\/strong><br \/>\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528<code>is<\/code>\u64cd\u4f5c\u7b26\u6765\u68c0\u67e5\u53d8\u91cf\u662f\u5426\u4e3a<code>None<\/code>\uff0c\u793a\u4f8b\u5982\u4e0b\uff1a  <\/p>\n<pre><code class=\"language-python\">if empty_variable is None:\n    print(&quot;\u53d8\u91cf\u662f\u7a7a\u7684&quot;)\n<\/code><\/pre>\n<p>\u6b64\u5916\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528\u5e03\u5c14\u503c\u8fdb\u884c\u68c0\u67e5\uff0c<code>if not empty_variable:<\/code> \u4e5f\u80fd\u5224\u65ad\u53d8\u91cf\u662f\u5426\u4e3a\u7a7a\u6216\u672a\u8d4b\u503c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u7684\u53d8\u91cf\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u5b8c\u6210\uff0c\u5305\u62ec\u4f7f\u7528None\u3001\u7a7a\u5b57\u7b26\u4e32&quot;&quot;\u3001\u7a7a\u5217 [&hellip;]","protected":false},"author":3,"featured_media":1130459,"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\/1130444"}],"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=1130444"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1130444\/revisions"}],"predecessor-version":[{"id":1130464,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1130444\/revisions\/1130464"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1130459"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1130444"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1130444"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1130444"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}