{"id":952992,"date":"2024-12-27T01:38:30","date_gmt":"2024-12-26T17:38:30","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/952992.html"},"modified":"2024-12-27T01:38:33","modified_gmt":"2024-12-26T17:38:33","slug":"python-%e5%a6%82%e4%bd%95%e5%88%a4%e6%96%ad%e4%b8%ba%e7%a9%ba","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/952992.html","title":{"rendered":"python \u5982\u4f55\u5224\u65ad\u4e3a\u7a7a"},"content":{"rendered":"<p style=\"text-align:center;\" ><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/25090648\/62c173dc-ccc9-4234-88a7-d2008c48d810.webp\" alt=\"python \u5982\u4f55\u5224\u65ad\u4e3a\u7a7a\" \/><\/p>\n<p><p> <strong>\u5728Python\u4e2d\u5224\u65ad\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u4e3a\u7a7a\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u6cd5\uff1a\u4f7f\u7528<code>not<\/code>\u5173\u952e\u5b57\u3001<code>len()<\/code>\u51fd\u6570\u3001\u4ee5\u53ca\u76f4\u63a5\u6bd4\u8f83<code>==<\/code>\u6216<code>is<\/code>\u3002<\/strong>\u5176\u4e2d\uff0c\u4f7f\u7528<code>not<\/code>\u5173\u952e\u5b57\u662f\u6700\u5e38\u89c1\u4e14\u76f4\u89c2\u7684\u65b9\u6cd5\u3002<code>not<\/code>\u53ef\u4ee5\u7528\u4e8e\u5224\u65ad\u5bf9\u8c61\u7684\u5e03\u5c14\u503c\uff0c\u5982\u679c\u5bf9\u8c61\u5728\u5e03\u5c14\u4e0a\u4e0b\u6587\u4e2d\u4e3a<code>False<\/code>\uff0c\u5219\u8868\u793a\u4e3a\u7a7a\u3002\u6b64\u5916\uff0c\u4f7f\u7528<code>len()<\/code>\u51fd\u6570\u5224\u65ad\u5bf9\u8c61\u7684\u957f\u5ea6\u662f\u5426\u4e3a0\u4e5f\u662f\u5e38\u89c1\u7684\u65b9\u5f0f\uff0c\u9002\u7528\u4e8e\u5b57\u7b26\u4e32\u3001\u5217\u8868\u3001\u5b57\u5178\u7b49\u53ef\u8fed\u4ee3\u5bf9\u8c61\u3002\u901a\u8fc7\u76f4\u63a5\u6bd4\u8f83<code>==<\/code>\u6216\u4f7f\u7528<code>is<\/code>\u5173\u952e\u5b57\u5224\u65ad\u5bf9\u8c61\u4e0e<code>None<\/code>\u7684\u5173\u7cfb\uff0c\u4e5f\u662f\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u4e3a\u7a7a\u7684\u6709\u6548\u624b\u6bb5\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u65b9\u6cd5\u53ca\u5176\u5728\u4e0d\u540c\u573a\u666f\u4e0b\u7684\u5e94\u7528\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u4f7f\u7528<code>not<\/code>\u5173\u952e\u5b57<\/h3>\n<\/p>\n<p><p>\u5728Python\u4e2d\uff0c\u7a7a\u5b57\u7b26\u4e32\u3001\u7a7a\u5217\u8868\u3001\u7a7a\u5b57\u5178\u3001\u7a7a\u96c6\u5408\u7b49\u5728\u5e03\u5c14\u4e0a\u4e0b\u6587\u4e2d\u90fd\u88ab\u89c6\u4e3a<code>False<\/code>\uff0c\u56e0\u6b64\u53ef\u4ee5\u4f7f\u7528<code>not<\/code>\u5173\u952e\u5b57\u6765\u5224\u65ad\u8fd9\u4e9b\u5bf9\u8c61\u662f\u5426\u4e3a\u7a7a\u3002<\/p>\n<\/p>\n<p><h4>1. \u7a7a\u5b57\u7b26\u4e32<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">my_string = &quot;&quot;<\/p>\n<p>if not my_string:<\/p>\n<p>    print(&quot;The string is empty.&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2. \u7a7a\u5217\u8868<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">my_list = []<\/p>\n<p>if not my_list:<\/p>\n<p>    print(&quot;The list is empty.&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>3. \u7a7a\u5b57\u5178<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">my_dict = {}<\/p>\n<p>if not my_dict:<\/p>\n<p>    print(&quot;The dictionary is empty.&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u4f7f\u7528<code>not<\/code>\u5173\u952e\u5b57\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u4e3a\u7a7a\u662f\u4e00\u79cd\u7b80\u6d01\u4e14\u76f4\u89c2\u7684\u65b9\u6cd5\uff0c\u9002\u7528\u4e8e\u5927\u591a\u6570\u5bf9\u8c61\u7c7b\u578b\u3002<\/p>\n<\/p>\n<p><h3>\u4e8c\u3001\u4f7f\u7528<code>len()<\/code>\u51fd\u6570<\/h3>\n<\/p>\n<p><p><code>len()<\/code>\u51fd\u6570\u53ef\u4ee5\u8fd4\u56de\u5bf9\u8c61\u7684\u957f\u5ea6\uff0c\u5bf9\u4e8e\u53ef\u8fed\u4ee3\u5bf9\u8c61\uff08\u5982\u5b57\u7b26\u4e32\u3001\u5217\u8868\u3001\u5b57\u5178\u7b49\uff09\uff0c\u5982\u679c\u957f\u5ea6\u4e3a0\uff0c\u5219\u8868\u793a\u5bf9\u8c61\u4e3a\u7a7a\u3002<\/p>\n<\/p>\n<p><h4>1. \u7a7a\u5b57\u7b26\u4e32<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">my_string = &quot;&quot;<\/p>\n<p>if len(my_string) == 0:<\/p>\n<p>    print(&quot;The string is empty.&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2. \u7a7a\u5217\u8868<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">my_list = []<\/p>\n<p>if len(my_list) == 0:<\/p>\n<p>    print(&quot;The list is empty.&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>3. \u7a7a\u5b57\u5178<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">my_dict = {}<\/p>\n<p>if len(my_dict) == 0:<\/p>\n<p>    print(&quot;The dictionary is empty.&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u4f7f\u7528<code>len()<\/code>\u51fd\u6570\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u4e3a\u7a7a\uff0c\u53ef\u4ee5\u66f4\u7cbe\u786e\u5730\u63a7\u5236\u6761\u4ef6\u5224\u65ad\uff0c\u5c24\u5176\u662f\u5728\u9700\u8981\u5bf9\u957f\u5ea6\u8fdb\u884c\u5176\u4ed6\u5224\u65ad\u65f6\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001\u76f4\u63a5\u6bd4\u8f83<code>==<\/code>\u6216\u4f7f\u7528<code>is<\/code><\/h3>\n<\/p>\n<p><p>\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u76f4\u63a5\u6bd4\u8f83\u5bf9\u8c61\u4e0e\u7279\u5b9a\u7684\u7a7a\u503c\uff08\u5982\u7a7a\u5b57\u7b26\u4e32<code>&quot;&quot;<\/code>\u3001\u7a7a\u5217\u8868<code>[]<\/code>\u3001\u7a7a\u5b57\u5178<code>{}<\/code>\u7b49\uff09\u4e5f\u53ef\u4ee5\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u4e3a\u7a7a\u3002\u6b64\u5916\uff0c\u5bf9\u4e8e\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u4e3a<code>None<\/code>\uff0c\u4f7f\u7528<code>is<\/code>\u5173\u952e\u5b57\u662f\u6700\u4f73\u5b9e\u8df5\u3002<\/p>\n<\/p>\n<p><h4>1. \u7a7a\u5b57\u7b26\u4e32<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">my_string = &quot;&quot;<\/p>\n<p>if my_string == &quot;&quot;:<\/p>\n<p>    print(&quot;The string is empty.&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2. \u7a7a\u5217\u8868<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">my_list = []<\/p>\n<p>if my_list == []:<\/p>\n<p>    print(&quot;The list is empty.&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>3. \u5224\u65ad\u662f\u5426\u4e3a<code>None<\/code><\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">my_variable = None<\/p>\n<p>if my_variable is None:<\/p>\n<p>    print(&quot;The variable is None.&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u76f4\u63a5\u6bd4\u8f83\u5bf9\u8c61\u4e0e\u7279\u5b9a\u7a7a\u503c\u662f\u4e00\u79cd\u76f4\u63a5\u4e14\u660e\u786e\u7684\u65b9\u6cd5\uff0c\u5c24\u5176\u662f\u5728\u53ea\u5173\u5fc3\u7279\u5b9a\u7c7b\u578b\u5bf9\u8c61\u65f6\u975e\u5e38\u65b9\u4fbf\u3002<\/p>\n<\/p>\n<p><h3>\u56db\u3001\u7efc\u5408\u4f7f\u7528\u573a\u666f<\/h3>\n<\/p>\n<p><p>\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u7efc\u5408\u4f7f\u7528\u4e0a\u8ff0\u65b9\u6cd5\u6765\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u4e3a\u7a7a\u3002\u4f8b\u5982\uff0c\u5728\u5904\u7406\u7528\u6237\u8f93\u5165\u65f6\uff0c\u53ef\u80fd\u9700\u8981\u5224\u65ad\u8f93\u5165\u7684\u5b57\u7b26\u4e32\u662f\u5426\u4e3a\u7a7a\u767d\uff0c\u6216\u5728\u5904\u7406API\u8fd4\u56de\u7684\u6570\u636e\u65f6\uff0c\u5224\u65ad\u8fd4\u56de\u7684\u6570\u636e\u7ed3\u6784\u662f\u5426\u4e3a\u7a7a\u3002<\/p>\n<\/p>\n<p><h4>1. \u5904\u7406\u7528\u6237\u8f93\u5165<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">user_input = input(&quot;Enter something: &quot;).strip()<\/p>\n<p>if not user_input:<\/p>\n<p>    print(&quot;You entered an empty string.&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2. \u5904\u7406API\u8fd4\u56de\u7684\u6570\u636e<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">api_response = {}<\/p>\n<p>if not api_response:<\/p>\n<p>    print(&quot;API returned an empty response.&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u901a\u8fc7\u7075\u6d3b\u4f7f\u7528\u4e0d\u540c\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6709\u6548\u5224\u65ad\u5404\u79cd\u5bf9\u8c61\u662f\u5426\u4e3a\u7a7a\uff0c\u5e76\u505a\u51fa\u76f8\u5e94\u7684\u5904\u7406\u3002\u65e0\u8bba\u662f\u7b80\u5355\u7684\u6761\u4ef6\u5224\u65ad\uff0c\u8fd8\u662f\u590d\u6742\u7684\u6570\u636e\u5904\u7406\uff0c\u8fd9\u4e9b\u65b9\u6cd5\u90fd\u80fd\u63d0\u4f9b\u5f3a\u5927\u7684\u652f\u6301\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p> <strong>\u5982\u4f55\u5728Python\u4e2d\u68c0\u6d4b\u4e00\u4e2a\u53d8\u91cf\u662f\u5426\u4e3a\u7a7a\uff1f<\/strong><br \/>\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u79cd\u65b9\u6cd5\u6765\u5224\u65ad\u4e00\u4e2a\u53d8\u91cf\u662f\u5426\u4e3a\u7a7a\u3002\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u662f\u76f4\u63a5\u4f7f\u7528if\u8bed\u53e5\u3002\u4f8b\u5982\uff0c\u7a7a\u5b57\u7b26\u4e32\u3001\u7a7a\u5217\u8868\u3001\u7a7a\u5b57\u5178\u548cNone\u90fd\u4f1a\u88ab\u89c6\u4e3aFalse\uff0c\u56e0\u6b64\u4f60\u53ef\u4ee5\u76f4\u63a5\u8fd9\u6837\u5199\uff1a<code>if not variable:<\/code>\u3002\u8fd9\u79cd\u65b9\u5f0f\u53ef\u4ee5\u6709\u6548\u5730\u68c0\u67e5\u53d8\u91cf\u662f\u5426\u4e3aNone\u3001\u7a7a\u5b57\u7b26\u4e32\u6216\u7a7a\u96c6\u5408\u3002<\/p>\n<p><strong>\u6709\u54ea\u4e9b\u5e38\u89c1\u7684\u7a7a\u503c\u7c7b\u578b\uff0c\u5982\u4f55\u5206\u522b\u5224\u65ad\uff1f<\/strong><br \/>\u5728Python\u4e2d\uff0c\u5e38\u89c1\u7684\u7a7a\u503c\u7c7b\u578b\u5305\u62ecNone\u3001\u7a7a\u5b57\u7b26\u4e32\uff08&quot;&quot;\uff09\u3001\u7a7a\u5217\u8868\uff08[]\uff09\u3001\u7a7a\u5b57\u5178\uff08{}\uff09\u548c\u7a7a\u5143\u7ec4\uff08()\uff09\u3002\u53ef\u4ee5\u4f7f\u7528<code>is<\/code>\u5173\u952e\u5b57\u5224\u65adNone\uff0c\u4f8b\u5982<code>if variable is None:<\/code>\u3002\u5bf9\u4e8e\u5176\u4ed6\u7c7b\u578b\uff0c\u53ef\u4ee5\u4f7f\u7528<code>len()<\/code>\u51fd\u6570\uff0c\u4f8b\u5982<code>if len(variable) == 0:<\/code>\u6765\u5224\u65ad\u5b83\u4eec\u662f\u5426\u4e3a\u7a7a\u3002<\/p>\n<p><strong>\u5982\u4f55\u5904\u7406\u53ef\u80fd\u4e3a\u7a7a\u7684\u7528\u6237\u8f93\u5165\uff1f<\/strong><br \/>\u5728\u5904\u7406\u7528\u6237\u8f93\u5165\u65f6\uff0c\u786e\u4fdd\u8f93\u5165\u7684\u6709\u6548\u6027\u975e\u5e38\u91cd\u8981\u3002\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528<code>strip()<\/code>\u65b9\u6cd5\u53bb\u9664\u5b57\u7b26\u4e32\u4e24\u7aef\u7684\u7a7a\u767d\uff0c\u7136\u540e\u68c0\u67e5\u5176\u957f\u5ea6\u6765\u5224\u65ad\u8f93\u5165\u662f\u5426\u4e3a\u7a7a\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a  <\/p>\n<pre><code class=\"language-python\">user_input = input(&quot;\u8bf7\u8f93\u5165\u5185\u5bb9: &quot;).strip()\nif not user_input:\n    print(&quot;\u8f93\u5165\u4e0d\u80fd\u4e3a\u7a7a&quot;)\nelse:\n    print(&quot;\u60a8\u8f93\u5165\u7684\u5185\u5bb9\u662f:&quot;, user_input)\n<\/code><\/pre>\n<p>\u8fd9\u79cd\u65b9\u6cd5\u4e0d\u4ec5\u53ef\u4ee5\u5224\u65ad\u7528\u6237\u662f\u5426\u8f93\u5165\u4e86\u5185\u5bb9\uff0c\u8fd8\u80fd\u5904\u7406\u8f93\u5165\u4e2d\u7684\u591a\u4f59\u7a7a\u683c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\u5224\u65ad\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u4e3a\u7a7a\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u6cd5\uff1a\u4f7f\u7528not\u5173\u952e\u5b57\u3001len()\u51fd\u6570\u3001\u4ee5\u53ca\u76f4\u63a5\u6bd4\u8f83==\u6216is [&hellip;]","protected":false},"author":3,"featured_media":952999,"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\/952992"}],"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=952992"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/952992\/revisions"}],"predecessor-version":[{"id":953000,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/952992\/revisions\/953000"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/952999"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=952992"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=952992"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=952992"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}