{"id":1084693,"date":"2025-01-08T13:09:33","date_gmt":"2025-01-08T05:09:33","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1084693.html"},"modified":"2025-01-08T13:09:35","modified_gmt":"2025-01-08T05:09:35","slug":"python%e5%a6%82%e4%bd%95%e5%ae%9a%e4%b9%89%e4%b8%80%e4%b8%aa%e7%a9%ba%e5%8f%98%e9%87%8f-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1084693.html","title":{"rendered":"python\u5982\u4f55\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u53d8\u91cf"},"content":{"rendered":"<p style=\"text-align:center;\" ><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/24194935\/c447cfe7-3295-45a9-84f5-51030b5d98f3.webp\" alt=\"python\u5982\u4f55\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u53d8\u91cf\" \/><\/p>\n<p><p> \u5728Python\u4e2d\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u53d8\u91cf\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c<strong>\u53ef\u4ee5\u4f7f\u7528None\u3001\u7a7a\u5b57\u7b26\u4e32\u3001\u7a7a\u5217\u8868\u3001\u7a7a\u5b57\u5178\u3001\u7a7a\u96c6\u5408\u3001\u7a7a\u5143\u7ec4<\/strong>\u7b49\u65b9\u6cd5\u6765\u5b9e\u73b0\u3002\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u662f\u4f7f\u7528None\u6765\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u53d8\u91cf\u3002<strong>None\u8868\u793a\u4e00\u4e2a\u7a7a\u503c\u6216\u672a\u5b9a\u4e49\u7684\u503c<\/strong>\uff0c\u5728Python\u4e2d\u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u5bf9\u8c61\u3002\u5728\u5b9e\u9645\u4f7f\u7528\u4e2d\uff0c\u9009\u62e9\u54ea\u79cd\u65b9\u6cd5\u53d6\u51b3\u4e8e\u5177\u4f53\u7684\u9700\u6c42\u548c\u53d8\u91cf\u7684\u7c7b\u578b\u3002\u4e0b\u9762\u6211\u4eec\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u65b9\u6cd5\u53ca\u5176\u4f7f\u7528\u573a\u666f\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u4f7f\u7528None\u5b9a\u4e49\u7a7a\u53d8\u91cf<\/h3>\n<\/p>\n<p><p>\u5728Python\u4e2d\uff0c\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u662f\u4f7f\u7528None\u6765\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u53d8\u91cf\u3002None\u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u5bf9\u8c61\uff0c\u8868\u793a\u6ca1\u6709\u503c\u6216\u672a\u5b9a\u4e49\u7684\u503c\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">empty_var = None<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u660e\u786e\u8868\u793a\u53d8\u91cf\u5f53\u524d\u6ca1\u6709\u503c\u7684\u60c5\u51b5\u3002\u4f8b\u5982\uff0c\u5728\u51fd\u6570\u4e2d\u53ef\u4ee5\u4f7f\u7528None\u6765\u521d\u59cb\u5316\u4e00\u4e2a\u53d8\u91cf\uff0c\u7136\u540e\u6839\u636e\u6761\u4ef6\u6765\u8d4b\u503c\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><p>\u4f7f\u7528None\u5b9a\u4e49\u7a7a\u53d8\u91cf\u7684\u4f18\u70b9\u662f\u8bed\u4e49\u660e\u786e\uff0c\u6613\u4e8e\u7406\u89e3\uff0c\u5e76\u4e14\u53ef\u4ee5\u7528\u4e8e\u4efb\u4f55\u7c7b\u578b\u7684\u53d8\u91cf\u3002<\/p>\n<\/p>\n<p><h3>\u4e8c\u3001\u4f7f\u7528\u7a7a\u5b57\u7b26\u4e32\u5b9a\u4e49\u7a7a\u53d8\u91cf<\/h3>\n<\/p>\n<p><p>\u5982\u679c\u53d8\u91cf\u7684\u9884\u671f\u7c7b\u578b\u662f\u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u4f7f\u7528\u7a7a\u5b57\u7b26\u4e32\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u53d8\u91cf\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">empty_str = &quot;&quot;<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u5b58\u50a8\u5b57\u7b26\u4e32\u6570\u636e\u7684\u53d8\u91cf\u3002\u4f8b\u5982\uff0c\u5728\u5904\u7406\u7528\u6237\u8f93\u5165\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u7a7a\u5b57\u7b26\u4e32\u521d\u59cb\u5316\u53d8\u91cf\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">user_input = &quot;&quot;<\/p>\n<p>if not user_input:<\/p>\n<p>    user_input = input(&quot;\u8bf7\u8f93\u5165\u5185\u5bb9\uff1a&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u4f7f\u7528\u7a7a\u5b57\u7b26\u4e32\u5b9a\u4e49\u7a7a\u53d8\u91cf\u7684\u4f18\u70b9\u662f\u53d8\u91cf\u7c7b\u578b\u660e\u786e\uff0c\u9002\u5408\u7528\u4e8e\u5b57\u7b26\u4e32\u64cd\u4f5c\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001\u4f7f\u7528\u7a7a\u5217\u8868\u5b9a\u4e49\u7a7a\u53d8\u91cf<\/h3>\n<\/p>\n<p><p>\u5982\u679c\u53d8\u91cf\u7684\u9884\u671f\u7c7b\u578b\u662f\u5217\u8868\uff0c\u53ef\u4ee5\u4f7f\u7528\u7a7a\u5217\u8868\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u53d8\u91cf\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">empty_list = []<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u5b58\u50a8\u591a\u4e2a\u5143\u7d20\u7684\u53d8\u91cf\uff0c\u4f8b\u5982\u5728\u6570\u636e\u6536\u96c6\u548c\u5904\u7406\u8fc7\u7a0b\u4e2d\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">data_list = []<\/p>\n<p>for i in range(10):<\/p>\n<p>    data_list.append(i)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u4f7f\u7528\u7a7a\u5217\u8868\u5b9a\u4e49\u7a7a\u53d8\u91cf\u7684\u4f18\u70b9\u662f\u53ef\u4ee5\u65b9\u4fbf\u5730\u8fdb\u884c\u5217\u8868\u64cd\u4f5c\uff0c\u5982\u6dfb\u52a0\u3001\u5220\u9664\u548c\u8fed\u4ee3\u5143\u7d20\u3002<\/p>\n<\/p>\n<p><h3>\u56db\u3001\u4f7f\u7528\u7a7a\u5b57\u5178\u5b9a\u4e49\u7a7a\u53d8\u91cf<\/h3>\n<\/p>\n<p><p>\u5982\u679c\u53d8\u91cf\u7684\u9884\u671f\u7c7b\u578b\u662f\u5b57\u5178\uff0c\u53ef\u4ee5\u4f7f\u7528\u7a7a\u5b57\u5178\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u53d8\u91cf\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">empty_dict = {}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u5b58\u50a8\u952e\u503c\u5bf9\u7684\u53d8\u91cf\uff0c\u4f8b\u5982\u5728\u5904\u7406\u914d\u7f6e\u4fe1\u606f\u6216\u6570\u636e\u6620\u5c04\u65f6\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">config = {}<\/p>\n<p>config[&quot;timeout&quot;] = 30<\/p>\n<p>config[&quot;retry&quot;] = 5<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u4f7f\u7528\u7a7a\u5b57\u5178\u5b9a\u4e49\u7a7a\u53d8\u91cf\u7684\u4f18\u70b9\u662f\u53ef\u4ee5\u65b9\u4fbf\u5730\u8fdb\u884c\u952e\u503c\u5bf9\u64cd\u4f5c\uff0c\u5982\u6dfb\u52a0\u3001\u5220\u9664\u548c\u67e5\u627e\u952e\u503c\u3002<\/p>\n<\/p>\n<p><h3>\u4e94\u3001\u4f7f\u7528\u7a7a\u96c6\u5408\u5b9a\u4e49\u7a7a\u53d8\u91cf<\/h3>\n<\/p>\n<p><p>\u5982\u679c\u53d8\u91cf\u7684\u9884\u671f\u7c7b\u578b\u662f\u96c6\u5408\uff0c\u53ef\u4ee5\u4f7f\u7528\u7a7a\u96c6\u5408\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u53d8\u91cf\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">empty_set = set()<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u5b58\u50a8\u552f\u4e00\u5143\u7d20\u7684\u53d8\u91cf\uff0c\u4f8b\u5982\u5728\u5904\u7406\u96c6\u5408\u64cd\u4f5c\u548c\u53bb\u91cd\u65f6\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">unique_items = set()<\/p>\n<p>for item in items:<\/p>\n<p>    unique_items.add(item)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u4f7f\u7528\u7a7a\u96c6\u5408\u5b9a\u4e49\u7a7a\u53d8\u91cf\u7684\u4f18\u70b9\u662f\u53ef\u4ee5\u65b9\u4fbf\u5730\u8fdb\u884c\u96c6\u5408\u64cd\u4f5c\uff0c\u5982\u6dfb\u52a0\u3001\u5220\u9664\u548c\u96c6\u5408\u8fd0\u7b97\u3002<\/p>\n<\/p>\n<p><h3>\u516d\u3001\u4f7f\u7528\u7a7a\u5143\u7ec4\u5b9a\u4e49\u7a7a\u53d8\u91cf<\/h3>\n<\/p>\n<p><p>\u5982\u679c\u53d8\u91cf\u7684\u9884\u671f\u7c7b\u578b\u662f\u5143\u7ec4\uff0c\u53ef\u4ee5\u4f7f\u7528\u7a7a\u5143\u7ec4\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u53d8\u91cf\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">empty_tuple = ()<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u5b58\u50a8\u4e0d\u53ef\u53d8\u5e8f\u5217\u7684\u53d8\u91cf\uff0c\u4f8b\u5982\u5728\u51fd\u6570\u8fd4\u56de\u591a\u4e2a\u503c\u65f6\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">def get_coordinates():<\/p>\n<p>    return ()<\/p>\n<p>coordinates = get_coordinates()<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u4f7f\u7528\u7a7a\u5143\u7ec4\u5b9a\u4e49\u7a7a\u53d8\u91cf\u7684\u4f18\u70b9\u662f\u5143\u7ec4\u4e0d\u53ef\u53d8\uff0c\u9002\u5408\u7528\u4e8e\u9700\u8981\u4e0d\u53ef\u53d8\u5e8f\u5217\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n<p><h3>\u4e03\u3001\u603b\u7ed3<\/h3>\n<\/p>\n<p><p>\u5728Python\u4e2d\u5b9a\u4e49\u7a7a\u53d8\u91cf\u7684\u65b9\u6cd5\u591a\u79cd\u591a\u6837\uff0c\u9009\u62e9\u9002\u5408\u7684\u65b9\u6cd5\u53d6\u51b3\u4e8e\u5177\u4f53\u7684\u9700\u6c42\u548c\u53d8\u91cf\u7684\u7c7b\u578b\u3002<strong>\u4f7f\u7528None\u3001\u7a7a\u5b57\u7b26\u4e32\u3001\u7a7a\u5217\u8868\u3001\u7a7a\u5b57\u5178\u3001\u7a7a\u96c6\u5408\u548c\u7a7a\u5143\u7ec4<\/strong>\u90fd\u662f\u5e38\u89c1\u7684\u65b9\u6cd5\u3002\u6bcf\u79cd\u65b9\u6cd5\u6709\u5176\u7279\u5b9a\u7684\u5e94\u7528\u573a\u666f\u548c\u4f18\u70b9\uff0c\u5408\u7406\u9009\u62e9\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n<\/p>\n<p><p>\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u5efa\u8bae\u6839\u636e\u53d8\u91cf\u7684\u9884\u671f\u7c7b\u578b\u548c\u4f7f\u7528\u573a\u666f\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c\u5982\u679c\u53d8\u91cf\u7c7b\u578b\u4e0d\u786e\u5b9a\uff0c\u53ef\u4ee5\u4f7f\u7528None\uff1b\u5982\u679c\u53d8\u91cf\u7c7b\u578b\u660e\u786e\uff0c\u53ef\u4ee5\u4f7f\u7528\u5bf9\u5e94\u7684\u7a7a\u503c\uff08\u5982\u7a7a\u5b57\u7b26\u4e32\u3001\u7a7a\u5217\u8868\u7b49\uff09\u3002\u8fd9\u6837\u53ef\u4ee5\u4f7f\u4ee3\u7801\u66f4\u52a0\u6e05\u6670\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u9519\u8bef\u548c\u6df7\u6dc6\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\u672a\u521d\u59cb\u5316\u7684\u53d8\u91cf\uff1f<\/strong><br \/>\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u7b80\u5355\u5730\u8d4b\u503c\u4e3a<code>None<\/code>\u6765\u521b\u5efa\u4e00\u4e2a\u672a\u521d\u59cb\u5316\u7684\u53d8\u91cf\u3002\u4f8b\u5982\uff0c\u4f7f\u7528<code>my_variable = None<\/code>\u3002\u8fd9\u6837\u505a\u53ef\u4ee5\u6e05\u695a\u5730\u8868\u660e\u8be5\u53d8\u91cf\u5c1a\u672a\u88ab\u8d4b\u4e88\u6709\u6548\u503c\uff0c\u4f46\u5b83\u4ecd\u7136\u5b58\u5728\u4e8e\u547d\u540d\u7a7a\u95f4\u4e2d\u3002<\/p>\n<p><strong>\u5728Python\u4e2d\uff0c\u7a7a\u5217\u8868\u548c\u7a7a\u5b57\u5178\u7684\u5b9a\u4e49\u65b9\u5f0f\u662f\u4ec0\u4e48\uff1f<\/strong><br \/>\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528<code>[]<\/code>\u6765\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u5217\u8868\uff0c\u4f8b\u5982<code>my_list = []<\/code>\uff0c\u800c\u4f7f\u7528<code>{}<\/code>\u6765\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u5b57\u5178\uff0c\u5982<code>my_dict = {}<\/code>\u3002\u8fd9\u4e24\u79cd\u6570\u636e\u7ed3\u6784\u90fd\u662f\u975e\u5e38\u5e38\u7528\u7684\uff0c\u53ef\u4ee5\u5728\u540e\u7eed\u7684\u4ee3\u7801\u4e2d\u9010\u6b65\u6dfb\u52a0\u5143\u7d20\u3002<\/p>\n<p><strong>\u4e3a\u4f55\u8981\u4f7f\u7528\u7a7a\u53d8\u91cf\uff0c\u7a7a\u5217\u8868\u6216\u7a7a\u5b57\u5178\uff1f<\/strong><br \/>\u4f7f\u7528\u7a7a\u53d8\u91cf\u3001\u7a7a\u5217\u8868\u6216\u7a7a\u5b57\u5178\u53ef\u4ee5\u5e2e\u52a9\u5f00\u53d1\u8005\u5728\u4ee3\u7801\u4e2d\u4fdd\u6301\u7075\u6d3b\u6027\u3002\u5b83\u4eec\u5141\u8bb8\u5728\u9700\u8981\u65f6\u52a8\u6001\u5730\u586b\u5145\u6570\u636e\uff0c\u4f7f\u5f97\u4ee3\u7801\u66f4\u5177\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002\u4f8b\u5982\uff0c\u5728\u51fd\u6570\u5185\u90e8\u5148\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u5217\u8868\uff0c\u7136\u540e\u6839\u636e\u7279\u5b9a\u6761\u4ef6\u6dfb\u52a0\u5143\u7d20\uff0c\u53ef\u4ee5\u66f4\u6e05\u6670\u5730\u8868\u8fbe\u4ee3\u7801\u7684\u610f\u56fe\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\u5b9a\u4e49\u4e00\u4e2a\u7a7a\u53d8\u91cf\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u53ef\u4ee5\u4f7f\u7528None\u3001\u7a7a\u5b57\u7b26\u4e32\u3001\u7a7a\u5217\u8868\u3001\u7a7a\u5b57\u5178\u3001\u7a7a\u96c6\u5408\u3001\u7a7a\u5143\u7ec4\u7b49\u65b9\u6cd5\u6765 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