{"id":1111676,"date":"2025-01-08T17:31:31","date_gmt":"2025-01-08T09:31:31","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1111676.html"},"modified":"2025-01-08T17:31:33","modified_gmt":"2025-01-08T09:31:33","slug":"python3%e4%b8%ad%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8has_key","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1111676.html","title":{"rendered":"python3\u4e2d\u5982\u4f55\u4f7f\u7528has_key"},"content":{"rendered":"<p style=\"text-align:center;\" ><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/25074033\/d492448e-5ebf-4341-b4e5-eb2bd6c7626c.webp\" alt=\"python3\u4e2d\u5982\u4f55\u4f7f\u7528has_key\" \/><\/p>\n<p><p> <strong>\u5728Python3\u4e2d\u4f7f\u7528has_key\u65b9\u6cd5\u7684\u66ff\u4ee3\u65b9\u6cd5\u662f\u4f7f\u7528&#39;in&#39;\u5173\u952e\u5b57\u3002Python3\u4e2dhas_key\u65b9\u6cd5\u5df2\u7ecf\u88ab\u5f03\u7528\u4e86\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528&#39;in&#39;\u5173\u952e\u5b57\u6765\u68c0\u67e5\u5b57\u5178\u4e2d\u662f\u5426\u5b58\u5728\u7279\u5b9a\u7684\u952e\u3002<\/strong><\/p>\n<\/p>\n<p><p>\u5728Python3\u4e2d\uff0c\u68c0\u67e5\u5b57\u5178\u662f\u5426\u5305\u542b\u67d0\u4e2a\u952e\u7684\u5e38\u89c1\u65b9\u6cd5\u662f\u4f7f\u7528&#39;in&#39;\u5173\u952e\u5b57\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u6709\u4e00\u4e2a\u5b57\u5178<code>my_dict<\/code>\uff0c\u5e76\u4e14\u4f60\u60f3\u68c0\u67e5\u952e<code>key<\/code>\u662f\u5426\u5728\u5b57\u5178\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u5f0f\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">if key in my_dict:<\/p>\n<p>    # \u952e\u5b58\u5728<\/p>\n<p>else:<\/p>\n<p>    # \u952e\u4e0d\u5b58\u5728<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u79cd\u65b9\u6cd5\u4e0d\u4ec5\u7b80\u6d01\uff0c\u800c\u4e14\u7b26\u5408Python3\u7684\u89c4\u8303\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u8ba8\u8bba\u5982\u4f55\u5728Python3\u4e2d\u4f7f\u7528\u5b57\u5178\uff0c\u5982\u4f55\u68c0\u67e5\u952e\u7684\u5b58\u5728\uff0c\u4ee5\u53ca\u4e00\u4e9b\u9ad8\u7ea7\u4f7f\u7528\u6280\u5de7\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u5b57\u5178\u7684\u57fa\u672c\u4f7f\u7528<\/h3>\n<\/p>\n<p><p>\u5b57\u5178\u662fPython\u4e2d\u975e\u5e38\u91cd\u8981\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u4ee5\u952e\u503c\u5bf9\u7684\u5f62\u5f0f\u5b58\u50a8\u6570\u636e\u3002\u5b57\u5178\u7684\u952e\u5fc5\u987b\u662f\u552f\u4e00\u7684\uff0c\u901a\u5e38\u662f\u4e0d\u53ef\u53d8\u7684\u7c7b\u578b\uff0c\u5982\u5b57\u7b26\u4e32\u3001\u6574\u6570\u3001\u5143\u7ec4\u7b49\u3002<\/p>\n<\/p>\n<p><h4>1. \u521b\u5efa\u5b57\u5178<\/h4>\n<\/p>\n<p><p>\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u521b\u5efa\u5b57\u5178\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\"># \u4f7f\u7528\u82b1\u62ec\u53f7<\/p>\n<p>my_dict = {&#39;name&#39;: &#39;Alice&#39;, &#39;age&#39;: 25, &#39;city&#39;: &#39;New York&#39;}<\/p>\n<h2><strong>\u4f7f\u7528dict()\u51fd\u6570<\/strong><\/h2>\n<p>my_dict = dict(name=&#39;Alice&#39;, age=25, city=&#39;New York&#39;)<\/p>\n<h2><strong>\u4f7f\u7528\u952e\u503c\u5bf9\u5217\u8868<\/strong><\/h2>\n<p>my_dict = dict([(&#39;name&#39;, &#39;Alice&#39;), (&#39;age&#39;, 25), (&#39;city&#39;, &#39;New York&#39;)])<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2. \u8bbf\u95ee\u5b57\u5178\u5143\u7d20<\/h4>\n<\/p>\n<p><p>\u53ef\u4ee5\u901a\u8fc7\u952e\u6765\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">name = my_dict[&#39;name&#39;]<\/p>\n<p>age = my_dict[&#39;age&#39;]<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e8c\u3001\u68c0\u67e5\u952e\u7684\u5b58\u5728<\/h3>\n<\/p>\n<p><p>\u6b63\u5982\u524d\u9762\u63d0\u5230\u7684\uff0cPython3\u4e2d\u4f7f\u7528&#39;in&#39;\u5173\u952e\u5b57\u6765\u68c0\u67e5\u5b57\u5178\u4e2d\u662f\u5426\u5b58\u5728\u67d0\u4e2a\u952e\u3002<\/p>\n<\/p>\n<p><h4>1. \u4f7f\u7528&#39;in&#39;\u5173\u952e\u5b57<\/h4>\n<\/p>\n<p><pre><code class=\"language-python\">if &#39;name&#39; in my_dict:<\/p>\n<p>    print(&quot;Name exists in dictionary&quot;)<\/p>\n<p>else:<\/p>\n<p>    print(&quot;Name does not exist in dictionary&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2. \u4f7f\u7528get()\u65b9\u6cd5<\/h4>\n<\/p>\n<p><p>\u53e6\u4e00\u4e2a\u5e38\u89c1\u7684\u65b9\u6cd5\u662f\u4f7f\u7528<code>get()<\/code>\u65b9\u6cd5\uff0c\u5b83\u5728\u952e\u4e0d\u5b58\u5728\u65f6\u4e0d\u4f1a\u629b\u51fa\u5f02\u5e38\uff0c\u800c\u662f\u8fd4\u56de\u4e00\u4e2a\u9ed8\u8ba4\u503c\uff08\u9ed8\u8ba4\u4e3a<code>None<\/code>\uff09\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">name = my_dict.get(&#39;name&#39;, &#39;Unknown&#39;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e09\u3001\u5b57\u5178\u7684\u9ad8\u7ea7\u64cd\u4f5c<\/h3>\n<\/p>\n<p><p>\u9664\u4e86\u57fa\u672c\u7684\u521b\u5efa\u548c\u8bbf\u95ee\u64cd\u4f5c\uff0c\u5b57\u5178\u8fd8\u6709\u8bb8\u591a\u9ad8\u7ea7\u64cd\u4f5c\u548c\u7528\u6cd5\u3002<\/p>\n<\/p>\n<p><h4>1. \u66f4\u65b0\u5b57\u5178<\/h4>\n<\/p>\n<p><p>\u53ef\u4ee5\u4f7f\u7528<code>update()<\/code>\u65b9\u6cd5\u6765\u66f4\u65b0\u5b57\u5178\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">my_dict.update({&#39;age&#39;: 26, &#39;city&#39;: &#39;San Francisco&#39;})<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2. \u5220\u9664\u5143\u7d20<\/h4>\n<\/p>\n<p><p>\u53ef\u4ee5\u4f7f\u7528<code>del<\/code>\u5173\u952e\u5b57\u6216<code>pop()<\/code>\u65b9\u6cd5\u6765\u5220\u9664\u5b57\u5178\u4e2d\u7684\u5143\u7d20\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">del my_dict[&#39;age&#39;]<\/p>\n<h2><strong>\u4f7f\u7528pop()\u65b9\u6cd5\u5220\u9664\u5e76\u8fd4\u56de\u503c<\/strong><\/h2>\n<p>city = my_dict.pop(&#39;city&#39;, &#39;Unknown&#39;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>3. \u904d\u5386\u5b57\u5178<\/h4>\n<\/p>\n<p><p>\u53ef\u4ee5\u4f7f\u7528<code>items()<\/code>\u65b9\u6cd5\u6765\u904d\u5386\u5b57\u5178\u4e2d\u7684\u952e\u503c\u5bf9\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">for key, value in my_dict.items():<\/p>\n<p>    print(f&quot;{key}: {value}&quot;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>4. \u5b57\u5178\u63a8\u5bfc\u5f0f<\/h4>\n<\/p>\n<p><p>\u5b57\u5178\u63a8\u5bfc\u5f0f\u662f\u4e00\u79cd\u7b80\u6d01\u7684\u521b\u5efa\u5b57\u5178\u7684\u65b9\u6cd5\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">squares = {x: x*x for x in range(6)}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u56db\u3001\u5b57\u5178\u7684\u5b9e\u9645\u5e94\u7528\u573a\u666f<\/h3>\n<\/p>\n<p><p>\u5b57\u5178\u5728\u5b9e\u9645\u7f16\u7a0b\u4e2d\u6709\u5f88\u591a\u5e94\u7528\u573a\u666f\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u89c1\u7684\u5e94\u7528\u573a\u666f\u548c\u793a\u4f8b\u4ee3\u7801\u3002<\/p>\n<\/p>\n<p><h4>1. \u8ba1\u6570\u5668<\/h4>\n<\/p>\n<p><p>\u5b57\u5178\u53ef\u4ee5\u7528\u6765\u7edf\u8ba1\u5143\u7d20\u7684\u51fa\u73b0\u6b21\u6570\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">from collections import defaultdict<\/p>\n<p>counter = defaultdict(int)<\/p>\n<p>words = [&#39;apple&#39;, &#39;banana&#39;, &#39;apple&#39;, &#39;orange&#39;, &#39;banana&#39;, &#39;apple&#39;]<\/p>\n<p>for word in words:<\/p>\n<p>    counter[word] += 1<\/p>\n<p>print(counter)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2. \u5206\u7ec4\u6570\u636e<\/h4>\n<\/p>\n<p><p>\u5b57\u5178\u53ef\u4ee5\u7528\u6765\u5206\u7ec4\u6570\u636e\uff0c\u4f8b\u5982\u6839\u636e\u67d0\u4e2a\u5c5e\u6027\u5bf9\u6570\u636e\u8fdb\u884c\u5206\u7ec4\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">data = [<\/p>\n<p>    {&#39;name&#39;: &#39;Alice&#39;, &#39;age&#39;: 25, &#39;city&#39;: &#39;New York&#39;},<\/p>\n<p>    {&#39;name&#39;: &#39;Bob&#39;, &#39;age&#39;: 30, &#39;city&#39;: &#39;San Francisco&#39;},<\/p>\n<p>    {&#39;name&#39;: &#39;Charlie&#39;, &#39;age&#39;: 25, &#39;city&#39;: &#39;New York&#39;},<\/p>\n<p>]<\/p>\n<p>grouped_data = defaultdict(list)<\/p>\n<p>for item in data:<\/p>\n<p>    grouped_data[item[&#39;city&#39;]].append(item)<\/p>\n<p>print(grouped_data)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>3. \u914d\u7f6e\u7ba1\u7406<\/h4>\n<\/p>\n<p><p>\u5b57\u5178\u5e38\u7528\u4e8e\u5b58\u50a8\u548c\u7ba1\u7406\u914d\u7f6e\u9879\uff0c\u4f8b\u5982\u8bfb\u53d6\u914d\u7f6e\u6587\u4ef6\u5e76\u5c06\u5176\u8f6c\u6362\u4e3a\u5b57\u5178\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import json<\/p>\n<p>config_json = &#39;&#39;&#39;<\/p>\n<p>{<\/p>\n<p>    &quot;database&quot;: {<\/p>\n<p>        &quot;host&quot;: &quot;localhost&quot;,<\/p>\n<p>        &quot;port&quot;: 3306<\/p>\n<p>    },<\/p>\n<p>    &quot;api_keys&quot;: {<\/p>\n<p>        &quot;service1&quot;: &quot;key1&quot;,<\/p>\n<p>        &quot;service2&quot;: &quot;key2&quot;<\/p>\n<p>    }<\/p>\n<p>}<\/p>\n<p>&#39;&#39;&#39;<\/p>\n<p>config = json.loads(config_json)<\/p>\n<p>print(config[&#39;database&#39;][&#39;host&#39;])<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e94\u3001\u5b57\u5178\u7684\u6027\u80fd\u4f18\u5316<\/h3>\n<\/p>\n<p><p>\u4f7f\u7528\u5b57\u5178\u65f6\uff0c\u4e86\u89e3\u5176\u6027\u80fd\u7279\u6027\u548c\u4f18\u5316\u65b9\u6cd5\u4e5f\u662f\u5f88\u91cd\u8981\u7684\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u6027\u80fd\u4f18\u5316\u7684\u6280\u5de7\u3002<\/p>\n<\/p>\n<p><h4>1. \u907f\u514d\u91cd\u590d\u8ba1\u7b97<\/h4>\n<\/p>\n<p><p>\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u901a\u8fc7\u7f13\u5b58\u8ba1\u7b97\u7ed3\u679c\u6765\u63d0\u9ad8\u6027\u80fd\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">cache = {}<\/p>\n<p>def expensive_computation(x):<\/p>\n<p>    if x in cache:<\/p>\n<p>        return cache[x]<\/p>\n<p>    result = x * x  # \u5047\u8bbe\u8fd9\u662f\u4e00\u4e2a\u6602\u8d35\u7684\u8ba1\u7b97<\/p>\n<p>    cache[x] = result<\/p>\n<p>    return result<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2. \u4f7f\u7528defaultdict<\/h4>\n<\/p>\n<p><p><code>defaultdict<\/code>\u53ef\u4ee5\u7b80\u5316\u5b57\u5178\u7684\u521d\u59cb\u5316\u8fc7\u7a0b\uff0c\u907f\u514d\u952e\u4e0d\u5b58\u5728\u7684\u9519\u8bef\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">from collections import defaultdict<\/p>\n<p>count = defaultdict(int)<\/p>\n<p>count[&#39;apple&#39;] += 1<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>3. \u4f7f\u7528Counter<\/h4>\n<\/p>\n<p><p><code>Counter<\/code>\u662f\u4e00\u4e2a\u4e13\u95e8\u7528\u4e8e\u8ba1\u6570\u7684\u5b57\u5178\uff0c\u53ef\u4ee5\u7b80\u5316\u8ba1\u6570\u64cd\u4f5c\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">from collections import Counter<\/p>\n<p>words = [&#39;apple&#39;, &#39;banana&#39;, &#39;apple&#39;, &#39;orange&#39;, &#39;banana&#39;, &#39;apple&#39;]<\/p>\n<p>counter = Counter(words)<\/p>\n<p>print(counter)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u516d\u3001\u5b57\u5178\u7684\u5e38\u89c1\u95ee\u9898\u548c\u89e3\u51b3\u65b9\u6848<\/h3>\n<\/p>\n<p><p>\u5728\u4f7f\u7528\u5b57\u5178\u65f6\uff0c\u53ef\u80fd\u4f1a\u9047\u5230\u4e00\u4e9b\u5e38\u89c1\u7684\u95ee\u9898\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u89c1\u95ee\u9898\u53ca\u5176\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<\/p>\n<p><h4>1. \u952e\u4e0d\u5b58\u5728<\/h4>\n<\/p>\n<p><p>\u5f53\u5c1d\u8bd5\u8bbf\u95ee\u4e0d\u5b58\u5728\u7684\u952e\u65f6\uff0c\u4f1a\u629b\u51faKeyError\u5f02\u5e38\u3002\u53ef\u4ee5\u4f7f\u7528<code>get()<\/code>\u65b9\u6cd5\u6765\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">value = my_dict.get(&#39;nonexistent_key&#39;, &#39;default_value&#39;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2. \u5b57\u5178\u7684\u6df1\u62f7\u8d1d<\/h4>\n<\/p>\n<p><p>\u5728\u9700\u8981\u4fee\u6539\u5b57\u5178\u526f\u672c\u800c\u4e0d\u5f71\u54cd\u539f\u5b57\u5178\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u6df1\u62f7\u8d1d\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import copy<\/p>\n<p>original_dict = {&#39;a&#39;: 1, &#39;b&#39;: {&#39;c&#39;: 2}}<\/p>\n<p>copied_dict = copy.deepcopy(original_dict)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>3. \u5b57\u5178\u6392\u5e8f<\/h4>\n<\/p>\n<p><p>\u5b57\u5178\u672c\u8eab\u662f\u65e0\u5e8f\u7684\uff0c\u5982\u679c\u9700\u8981\u6309\u952e\u6216\u503c\u6392\u5e8f\uff0c\u53ef\u4ee5\u4f7f\u7528<code>sorted()<\/code>\u51fd\u6570\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">sorted_dict = dict(sorted(my_dict.items()))<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e03\u3001\u603b\u7ed3<\/h3>\n<\/p>\n<p><p>Python3\u4e2d\u4f7f\u7528\u5b57\u5178\u8fdb\u884c\u6570\u636e\u5b58\u50a8\u548c\u64cd\u4f5c\u662f\u975e\u5e38\u5e38\u89c1\u7684\u4efb\u52a1\u3002\u867d\u7136<code>has_key<\/code>\u65b9\u6cd5\u5728Python3\u4e2d\u5df2\u7ecf\u88ab\u5f03\u7528\uff0c\u4f46\u4f7f\u7528&#39;in&#39;\u5173\u952e\u5b57\u6216<code>get()<\/code>\u65b9\u6cd5\u53ef\u4ee5\u8f7b\u677e\u66ff\u4ee3\u5176\u529f\u80fd\u3002\u672c\u6587\u8be6\u7ec6\u4ecb\u7ecd\u4e86\u5b57\u5178\u7684\u57fa\u672c\u4f7f\u7528\u3001\u952e\u5b58\u5728\u68c0\u67e5\u3001\u9ad8\u7ea7\u64cd\u4f5c\u3001\u5b9e\u9645\u5e94\u7528\u573a\u666f\u3001\u6027\u80fd\u4f18\u5316\u4ee5\u53ca\u5e38\u89c1\u95ee\u9898\u89e3\u51b3\u65b9\u6848\u3002\u5e0c\u671b\u901a\u8fc7\u672c\u6587\u7684\u4ecb\u7ecd\uff0c\u80fd\u591f\u5e2e\u52a9\u4f60\u66f4\u597d\u5730\u7406\u89e3\u548c\u4f7f\u7528Python3\u4e2d\u7684\u5b57\u5178\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p> <strong>\u5728Python 3\u4e2d\uff0chas_key()\u51fd\u6570\u662f\u5426\u4ecd\u7136\u53ef\u7528\uff1f<\/strong><br \/>\u5728Python 3\u4e2d\uff0chas_key()\u51fd\u6570\u5df2\u7ecf\u88ab\u79fb\u9664\u3002\u53d6\u800c\u4ee3\u4e4b\u7684\u662f\u4f7f\u7528<code>in<\/code>\u5173\u952e\u5b57\u6765\u68c0\u67e5\u5b57\u5178\u4e2d\u662f\u5426\u5b58\u5728\u67d0\u4e2a\u952e\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528<code>if key in my_dict:<\/code>\u7684\u65b9\u5f0f\u6765\u5224\u65ad\u5b57\u5178\u4e2d\u662f\u5426\u5305\u542b\u7279\u5b9a\u7684\u952e\u3002<\/p>\n<p><strong>\u4f7f\u7528in\u5173\u952e\u5b57\u68c0\u67e5\u952e\u5b58\u5728\u6027\u548c\u4f7f\u7528has_key()\u7684\u6548\u679c\u6709\u4ec0\u4e48\u4e0d\u540c\uff1f<\/strong><br \/>\u4f7f\u7528<code>in<\/code>\u5173\u952e\u5b57\u68c0\u67e5\u5b57\u5178\u4e2d\u952e\u7684\u5b58\u5728\u6027\u662f\u66f4\u4e3a\u7b80\u6d01\u548c\u73b0\u4ee3\u7684\u505a\u6cd5\u3002\u5728\u8bed\u4e49\u4e0a\uff0c\u4e24\u8005\u90fd\u662f\u7528\u6765\u5224\u65ad\u5b57\u5178\u4e2d\u662f\u5426\u5305\u542b\u67d0\u4e2a\u7279\u5b9a\u7684\u952e\u3002\u4f7f\u7528<code>in<\/code>\u7684\u65b9\u5f0f\u66f4\u7b26\u5408Python\u7684\u8bbe\u8ba1\u54f2\u5b66\uff0c\u4f7f\u5f97\u4ee3\u7801\u66f4\u52a0\u6e05\u6670\u6613\u61c2\u3002<\/p>\n<p><strong>\u5982\u679c\u6211\u60f3\u67e5\u770b\u5b57\u5178\u4e2d\u6240\u6709\u952e\u7684\u5b58\u5728\u6027\uff0c\u5e94\u8be5\u5982\u4f55\u64cd\u4f5c\uff1f<\/strong><br \/>\u53ef\u4ee5\u4f7f\u7528\u5b57\u5178\u7684<code>keys()<\/code>\u65b9\u6cd5\u6765\u83b7\u53d6\u6240\u6709\u952e\u7684\u5217\u8868\u3002\u901a\u8fc7\u904d\u5386\u8fd9\u4e9b\u952e\uff0c\u53ef\u4ee5\u68c0\u67e5\u6bcf\u4e2a\u952e\u7684\u5b58\u5728\u6027\u3002\u4f8b\u5982\uff0c<code>for key in my_dict.keys():<\/code>\u53ef\u4ee5\u5e2e\u52a9\u4f60\u904d\u5386\u6240\u6709\u7684\u952e\uff0c\u5e76\u8fdb\u884c\u76f8\u5e94\u7684\u903b\u8f91\u5904\u7406\u3002<\/p>\n<p><strong>\u5728Python\u4e2d\uff0c\u4f7f\u7528in\u5173\u952e\u5b57\u65f6\u6709\u54ea\u4e9b\u6700\u4f73\u5b9e\u8df5\uff1f<\/strong><br \/>\u5728\u4f7f\u7528<code>in<\/code>\u5173\u952e\u5b57\u65f6\uff0c\u786e\u4fdd\u5b57\u5178\u5df2\u88ab\u521d\u59cb\u5316\u5e76\u4e14\u4e0d\u4e3a\u7a7a\u662f\u5f88\u91cd\u8981\u7684\u3002\u6b64\u5916\uff0c\u4f7f\u7528<code>in<\/code>\u65f6\u8981\u6ce8\u610f\u533a\u5206\u5927\u5c0f\u5199\uff0c\u56e0\u4e3aPython\u4e2d\u7684\u5b57\u7b26\u4e32\u662f\u533a\u5206\u5927\u5c0f\u5199\u7684\u3002\u6700\u540e\uff0c\u5c3d\u91cf\u5c06\u68c0\u67e5\u64cd\u4f5c\u653e\u5728\u6761\u4ef6\u8bed\u53e5\u4e2d\uff0c\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python3\u4e2d\u4f7f\u7528has_key\u65b9\u6cd5\u7684\u66ff\u4ee3\u65b9\u6cd5\u662f\u4f7f\u7528&#39;in&#39;\u5173\u952e\u5b57\u3002Python3\u4e2dhas [&hellip;]","protected":false},"author":3,"featured_media":1111685,"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\/1111676"}],"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=1111676"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1111676\/revisions"}],"predecessor-version":[{"id":1111686,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1111676\/revisions\/1111686"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1111685"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1111676"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1111676"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1111676"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}