{"id":2941,"date":"2024-11-25T00:18:38","date_gmt":"2024-11-24T16:18:38","guid":{"rendered":"http:\/\/viplao.com\/?p=2941"},"modified":"2024-11-25T00:18:40","modified_gmt":"2024-11-24T16:18:40","slug":"python%e5%9f%ba%e7%a1%80%e6%8a%80%e8%83%bd-python%e4%b8%ad20%e4%b8%aa%e4%b8%8d%e4%b8%ba%e4%ba%ba%e7%9f%a5%e7%9a%84%e9%ab%98%e7%ba%a7%e7%89%b9%e6%80%a7","status":"publish","type":"post","link":"http:\/\/viplao.com\/index.php\/2024\/11\/25\/python%e5%9f%ba%e7%a1%80%e6%8a%80%e8%83%bd-python%e4%b8%ad20%e4%b8%aa%e4%b8%8d%e4%b8%ba%e4%ba%ba%e7%9f%a5%e7%9a%84%e9%ab%98%e7%ba%a7%e7%89%b9%e6%80%a7\/","title":{"rendered":"PYTHON\u57fa\u7840\u6280\u80fd \u2013\u00a0Python\u4e2d20\u4e2a\u4e0d\u4e3a\u4eba\u77e5\u7684\u9ad8\u7ea7\u7279\u6027"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_71 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" 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title=\"\u7279\u602714\uff1aos.path\u7684\u9ad8\u7ea7\u8def\u5f84\u5904\u7406\">\u7279\u602714\uff1aos.path\u7684\u9ad8\u7ea7\u8def\u5f84\u5904\u7406<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"http:\/\/viplao.com\/index.php\/2024\/11\/25\/python%e5%9f%ba%e7%a1%80%e6%8a%80%e8%83%bd-python%e4%b8%ad20%e4%b8%aa%e4%b8%8d%e4%b8%ba%e4%ba%ba%e7%9f%a5%e7%9a%84%e9%ab%98%e7%ba%a7%e7%89%b9%e6%80%a7\/#%E7%89%B9%E6%80%A715%EF%BC%9Adatetime%E6%A8%A1%E5%9D%97%E7%9A%84%E9%AB%98%E7%BA%A7%E6%97%A5%E6%9C%9F%E6%93%8D%E4%BD%9C\" title=\"\u7279\u602715\uff1adatetime\u6a21\u5757\u7684\u9ad8\u7ea7\u65e5\u671f\u64cd\u4f5c\">\u7279\u602715\uff1adatetime\u6a21\u5757\u7684\u9ad8\u7ea7\u65e5\u671f\u64cd\u4f5c<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%BC%95%E8%A8%80\"><\/span><strong>\u5f15\u8a00<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Python\uff0c\u4ee5\u5176\u7b80\u6d01\u660e\u4e86\u7684\u8bed\u6cd5\u548c\u5f3a\u5927\u7684\u5e93\u652f\u6301\uff0c\u6210\u4e3a\u521d\u5b66\u8005\u4e0e\u4e13\u5bb6\u90fd\u7231\u4e0d\u91ca\u624b\u7684\u8bed\u8a00\u3002\u4f46\u9690\u85cf\u5728\u5b83\u5e73\u6613\u8fd1\u4eba\u7684\u5916\u8868\u4e0b\uff0c\u662f\u4e00\u7cfb\u5217\u9ad8\u7ea7\u7279\u6027\uff0c\u7b49\u5f85\u7740\u63a2\u7d22\u8005\u7684\u53d1\u73b0\u3002\u672c\u6587\u5c06\u5e26\u4f60\u9886\u7565Python\u768420\u4e2a\u4e0d\u4e3a\u4eba\u77e5\u7684\u9ad8\u7ea7\u7279\u6027\uff0c\u8ba9\u4f60\u7684\u4ee3\u7801\u66f4\u52a0\u9ad8\u6548\u3001\u4f18\u96c5\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%89%B9%E6%80%A71%EF%BC%9A%E7%94%9F%E6%88%90%E5%99%A8%E8%A1%A8%E8%BE%BE%E5%BC%8F\"><\/span><strong>\u7279\u60271\uff1a\u751f\u6210\u5668\u8868\u8fbe\u5f0f<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u751f\u6210\u5668\u8868\u8fbe\u5f0f\u662f\u5217\u8868\u63a8\u5bfc\u5f0f\u7684\u5185\u5b58\u53cb\u597d\u7248\u3002\u5b83\u5728\u5904\u7406\u5927\u91cf\u6570\u636e\u65f6\u5c24\u4e3a\u6709\u7528\uff0c\u56e0\u4e3a\u5b83\u5ef6\u8fdf\u8ba1\u7b97\uff0c\u4e00\u6b21\u53ea\u4ea7\u751f\u4e00\u4e2a\u7ed3\u679c\u3002\u6bd4\u5982\uff0c<code>gen = (x**2 for x in range(10))<\/code>\uff0c\u8fd9\u4e0d\u4f1a\u7acb\u5373\u8ba1\u7b97\u51fa\u6240\u6709\u5e73\u65b9\u503c\uff0c\u800c\u662f\u5728\u6bcf\u6b21\u8fed\u4ee3\u65f6\u6309\u9700\u751f\u6210\u3002<\/p>\n\n\n\n<p><strong>\u5b9e\u6218\u5c0f\u6280\u5de7\uff1a<\/strong> \u4f7f\u7528\u751f\u6210\u5668\u8868\u8fbe\u5f0f\u53ef\u4ee5\u51cf\u5c11\u5185\u5b58\u5360\u7528\uff0c\u5c24\u5176\u662f\u5728\u5faa\u73af\u4e2d\u5904\u7406\u5927\u6587\u4ef6\u6216\u5927\u6570\u636e\u96c6\u65f6\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%89%B9%E6%80%A72%EF%BC%9A%E5%88%97%E8%A1%A8%E8%A7%A3%E6%9E%90%E5%A2%9E%E5%BC%BA%E8%B5%8B%E5%80%BC\"><\/span><strong>\u7279\u60272\uff1a\u5217\u8868\u89e3\u6790\u589e\u5f3a\u8d4b\u503c<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u53ef\u80fd\u4f60\u6ca1\u6ce8\u610f\u5230\uff0c\u5217\u8868\u89e3\u6790\u4e0d\u4ec5\u80fd\u521b\u5efa\u65b0\u5217\u8868\uff0c\u8fd8\u80fd\u4e0e\u73b0\u6709\u5217\u8868\u7ed3\u5408\uff0c\u8fdb\u884c\u539f\u5730\u4fee\u6539\u3002\u4f8b\u5982\uff0c<code>[x*2 for x in lst] += [10]<\/code>\uff0c\u8fd9\u91cc\u5148\u521b\u5efa\u4e86\u4e00\u4e2a\u7531lst\u5143\u7d20\u4e24\u500d\u7ec4\u6210\u7684\u4e34\u65f6\u5217\u8868\uff0c\u7136\u540e\u5c06\u6570\u5b5710\u6dfb\u52a0\u5230lst\u672b\u5c3e\uff0c\u5b9e\u73b0\u4e86\u4e00\u6b21\u6027\u6269\u5c55\u5e76\u4fee\u6539\u5217\u8868\u7684\u64cd\u4f5c\u3002<\/p>\n\n\n\n<p><strong>\u6ce8\u610f\u70b9\uff1a<\/strong> \u8fd9\u79cd\u5199\u6cd5\u867d\u7136\u7b80\u6d01\uff0c\u4f46\u5728\u5904\u7406\u5927\u578b\u5217\u8868\u65f6\u9700\u8c28\u614e\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u5185\u5b58\u5f00\u9500\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u6df1\u5165\u4e86\u89e3\u5b57\u5178\u4e0e\u96c6\u5408\u7684\u9ad8\u7ea7\u7279\u6027\uff0c\u4ee5\u53ca\u5982\u4f55\u5229\u7528\u5b83\u4eec\u6765\u63d0\u5347\u4ee3\u7801\u6548\u7387\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%89%B9%E6%80%A73%EF%BC%9A%E5%AD%97%E5%85%B8%E6%8E%A8%E5%AF%BC%E5%BC%8F%E4%B8%8E%E5%90%88%E5%B9%B6\"><\/span><strong>\u7279\u60273\uff1a\u5b57\u5178\u63a8\u5bfc\u5f0f\u4e0e\u5408\u5e76<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u5b57\u5178\u63a8\u5bfc\u5f0f\u662f\u5feb\u901f\u6784\u5efa\u65b0\u5b57\u5178\u7684\u795e\u5668\u3002\u6bd4\u5982\uff0c<code>{k: v*2 for k, v in my_dict.items()}<\/code>\u5c06\u6bcf\u4e2a\u503c\u7ffb\u500d\u3002\u800cPython 3.5+\u5f15\u5165\u4e86\u5b57\u5178\u5408\u5e76\u7684\u65b0\u8bed\u6cd5\uff0c<code>{**d1, **d2}<\/code>\uff0c\u76f4\u63a5\u5408\u5e76\u4e24\u4e2a\u5b57\u5178\uff0c\u89e3\u51b3\u4e86\u4f20\u7edf<code>.update()<\/code>\u7684\u7e41\u7410\u3002<\/p>\n\n\n\n<p><strong>\u5b9e\u6218\u6848\u4f8b\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>d1&nbsp;=&nbsp;{'a':&nbsp;1,&nbsp;'b':&nbsp;2}<br>d2&nbsp;=&nbsp;{'b':&nbsp;3,&nbsp;'c':&nbsp;4}<br>merged&nbsp;=&nbsp;{**d1,&nbsp;**d2}&nbsp;&nbsp;<em>#&nbsp;\u7ed3\u679c:&nbsp;{'a':&nbsp;1,&nbsp;'b':&nbsp;3,&nbsp;'c':&nbsp;4}<\/em><\/code><\/pre>\n\n\n\n<p>\u6b64\u6280\u5de7\u5728\u914d\u7f6e\u5408\u5e76\u6216\u5904\u7406API\u8fd4\u56de\u7684\u5d4c\u5957\u5b57\u5178\u65f6\u7279\u522b\u6709\u7528\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%89%B9%E6%80%A74%EF%BC%9A%E9%9B%86%E5%90%88%E6%93%8D%E4%BD%9C%E7%9A%84%E9%AB%98%E6%95%88%E6%80%A7\"><\/span><strong>\u7279\u60274\uff1a\u96c6\u5408\u64cd\u4f5c\u7684\u9ad8\u6548\u6027<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u96c6\u5408\uff08set\uff09\u63d0\u4f9b\u4e86\u72ec\u7279\u7684\u6570\u5b66\u96c6\u5408\u8fd0\u7b97\uff0c\u5982\u4ea4\u96c6(<code>&amp;<\/code>)\u3001\u5e76\u96c6(<code>|<\/code>)\u3001\u5dee\u96c6(<code>-<\/code>)\u3001\u5bf9\u79f0\u5dee\u96c6(<code>^<\/code>)\u3002<code>symmetric_difference()<\/code>\u65b9\u6cd5\u662f\u627e\u51fa\u4e24\u4e2a\u96c6\u5408\u4e2d\u72ec\u6709\u7684\u5143\u7d20\uff0c\u975e\u5e38\u9002\u7528\u4e8e\u53bb\u91cd\u5408\u5e76\u4e24\u4e2a\u5217\u8868\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>set1&nbsp;=&nbsp;{1,&nbsp;2,&nbsp;3}<br>set2&nbsp;=&nbsp;{2,&nbsp;3,&nbsp;4}<br>unique_elements&nbsp;=&nbsp;set1.symmetric_difference(set2)&nbsp;&nbsp;<em>#&nbsp;\u7ed3\u679c:&nbsp;{1,&nbsp;4}<\/em><\/code><\/pre>\n\n\n\n<p>\u96c6\u5408\u64cd\u4f5c\u56e0\u5176\u5e95\u5c42C\u5b9e\u73b0\uff0c\u901a\u5e38\u6bd4\u7b49\u4ef7\u7684\u5217\u8868\u64cd\u4f5c\u66f4\u5feb\uff0c\u9002\u5408\u4e8e\u5927\u6570\u636e\u91cf\u7684\u53bb\u91cd\u548c\u6bd4\u8f83\u64cd\u4f5c\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u63a5\u4e0b\u6765\uff0c\u6df1\u5165\u51fd\u6570\u7684\u4e16\u754c\uff0c\u63a2\u7d22\u88c5\u9970\u5668\u3001\u504f\u51fd\u6570\u548c\u95ed\u5305\u7684\u9ad8\u7ea7\u7528\u6cd5\uff0c\u8fd9\u4e9b\u662fPython\u7f16\u7a0b\u4e2d\u7684\u7cbe\u9ad3\u6240\u5728\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%89%B9%E6%80%A75%EF%BC%9A%E8%A3%85%E9%A5%B0%E5%99%A8%E7%9A%84%E6%B7%B1%E5%B1%82%E7%90%86%E8%A7%A3\"><\/span><strong>\u7279\u60275\uff1a\u88c5\u9970\u5668\u7684\u6df1\u5c42\u7406\u89e3<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u88c5\u9970\u5668\u662fPython\u4e2d\u4e00\u79cd\u6539\u53d8\u51fd\u6570\u6216\u7c7b\u884c\u4e3a\u7684\u9ad8\u7ea7\u7279\u6027\u3002\u901a\u8fc7\u5b9a\u4e49\u4e00\u4e2a\u63a5\u53d7\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u7684\u51fd\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u51fd\u6570\u6765\u6269\u5c55\u539f\u51fd\u6570\u7684\u529f\u80fd\u3002\u4f8b\u5982\uff0c\u4e00\u4e2a\u7b80\u5355\u7684\u65e5\u5fd7\u88c5\u9970\u5668\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>def&nbsp;log_decorator(func):<br>&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;wrapper(*args,&nbsp;**kwargs):<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;print(f\"Calling&nbsp;{func.__name__}\")<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;func(*args,&nbsp;**kwargs)<br>&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;wrapper<br><br>@log_decorator<br>def&nbsp;greet(name):<br>&nbsp;&nbsp;&nbsp;&nbsp;print(f\"Hello,&nbsp;{name}\")<br><br>greet(\"World\")&nbsp;&nbsp;<em>#&nbsp;\u8f93\u51fa:&nbsp;Calling&nbsp;greet&nbsp;Hello,&nbsp;World<\/em><\/code><\/pre>\n\n\n\n<p>\u88c5\u9970\u5668\u7684\u5f3a\u5927\u5728\u4e8e\u5176\u7075\u6d3b\u6027\u548c\u4e0d\u4fee\u6539\u539f\u51fd\u6570\u4ee3\u7801\u5373\u53ef\u589e\u52a0\u529f\u80fd\u7684\u80fd\u529b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%89%B9%E6%80%A76%EF%BC%9A%E5%81%8F%E5%87%BD%E6%95%B0%E7%9A%84%E5%BA%94%E7%94%A8\"><\/span><strong>\u7279\u60276\uff1a\u504f\u51fd\u6570\u7684\u5e94\u7528<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><code>functools.partial<\/code>\u5141\u8bb8\u4f60\u201c\u51bb\u7ed3\u201d\u90e8\u5206\u51fd\u6570\u53c2\u6570\uff0c\u521b\u5efa\u65b0\u7684\u51fd\u6570\u3002\u8fd9\u5bf9\u4e8e\u56fa\u5b9a\u67d0\u4e9b\u53c2\u6570\u503c\uff0c\u7b80\u5316\u63a5\u53e3\u6216\u9002\u5e94\u7279\u5b9a\u573a\u666f\u975e\u5e38\u6709\u7528\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from&nbsp;functools&nbsp;import&nbsp;partial<br><br>def&nbsp;power(base,&nbsp;exponent):<br>&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;base&nbsp;**&nbsp;exponent<br><br>square&nbsp;=&nbsp;partial(power,&nbsp;exponent=2)<br>print(square(5))&nbsp;&nbsp;<em>#&nbsp;\u7ed3\u679c:&nbsp;25<\/em><\/code><\/pre>\n\n\n\n<p>\u901a\u8fc7\u504f\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u521b\u5efa\u7279\u5b9a\u7528\u9014\u7684\u51fd\u6570\uff0c\u63d0\u9ad8\u4ee3\u7801\u7684\u590d\u7528\u6027\u548c\u53ef\u8bfb\u6027\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%89%B9%E6%80%A77%EF%BC%9A%E9%97%AD%E5%8C%85%E7%9A%84%E5%86%85%E9%83%A8%E6%9C%BA%E5%88%B6\"><\/span><strong>\u7279\u60277\uff1a\u95ed\u5305\u7684\u5185\u90e8\u673a\u5236<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u95ed\u5305\u662f\u6307\u80fd\u591f\u8bbf\u95ee\u5916\u90e8\u51fd\u6570\u4f5c\u7528\u57df\u53d8\u91cf\u7684\u5185\u90e8\u51fd\u6570\u3002\u5b83\u4fdd\u5b58\u4e86\u5916\u90e8\u4f5c\u7528\u57df\u7684\u72b6\u6001\uff0c\u5373\u4f7f\u5916\u90e8\u51fd\u6570\u5df2\u7ecf\u6267\u884c\u5b8c\u6bd5\u3002\u95ed\u5305\u5e38\u7528\u4e8e\u521b\u5efa\u5e26\u72b6\u6001\u7684\u51fd\u6570\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>def&nbsp;counter():<br>&nbsp;&nbsp;&nbsp;&nbsp;count&nbsp;=&nbsp;0<br>&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;increment():<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;nonlocal&nbsp;count<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;count&nbsp;+=&nbsp;1<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;count<br>&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;increment<br><br>my_counter&nbsp;=&nbsp;counter()<br>print(my_counter())&nbsp;&nbsp;<em>#&nbsp;\u8f93\u51fa:&nbsp;1<\/em><br>print(my_counter())&nbsp;&nbsp;<em>#&nbsp;\u8f93\u51fa:&nbsp;2<\/em><\/code><\/pre>\n\n\n\n<p>\u95ed\u5305\u5728\u5b9e\u73b0\u7f13\u5b58\u3001\u5355\u4f8b\u6a21\u5f0f\u548c\u5c01\u88c5\u5c40\u90e8\u72b6\u6001\u65f6\u975e\u5e38\u6709\u7528\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u4ee5\u4e0a\u7279\u6027\u63ed\u793a\u4e86Python\u51fd\u6570\u7684\u7075\u6d3b\u6027\u548c\u5f3a\u5927\uff0c\u4e0b\u4e00\u90e8\u5206\u6211\u4eec\u5c06\u63a2\u7d22\u8fed\u4ee3\u5668\u3001\u751f\u6210\u5668\u548c\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u7684\u5965\u79d8\uff0c\u8fdb\u4e00\u6b65\u6df1\u5316\u4f60\u7684Python\u9ad8\u7ea7\u6280\u80fd\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%89%B9%E6%80%A78%EF%BC%9A%E6%97%A0%E9%99%90%E5%BA%8F%E5%88%97%E7%9A%84%E7%94%9F%E6%88%90\"><\/span><strong>\u7279\u60278\uff1a\u65e0\u9650\u5e8f\u5217\u7684\u751f\u6210<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Python\u7684<code>itertools<\/code>\u6a21\u5757\u63d0\u4f9b\u4e86\u8bb8\u591a\u5f3a\u5927\u7684\u8fed\u4ee3\u5de5\u5177\uff0c\u5982<code>count()<\/code>\uff0c\u5b83\u53ef\u4ee5\u751f\u6210\u65e0\u9650\u7684\u8ba1\u6570\u5e8f\u5217\u3002\u8fd9\u5bf9\u4e8e\u6a21\u62df\u5faa\u73af\u6216\u751f\u6210\u8fde\u7eed\u6570\u5217\u7279\u522b\u6709\u7528\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from&nbsp;itertools&nbsp;import&nbsp;count<br><br>for&nbsp;i&nbsp;in&nbsp;count(start=1):<br>&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;i&nbsp;&gt;&nbsp;10:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break<br>&nbsp;&nbsp;&nbsp;&nbsp;print(i)<\/code><\/pre>\n\n\n\n<p>\u8fd9\u6bb5\u4ee3\u7801\u4f1a\u6253\u5370\u4ece1\u523010\u7684\u6570\u5b57\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u63a7\u5236\u65e0\u9650\u5e8f\u5217\u7684\u4f7f\u7528\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%89%B9%E6%80%A79%EF%BC%9A%E8%BF%AD%E4%BB%A3%E5%99%A8%E5%8D%8F%E8%AE%AE%E7%9A%84%E8%87%AA%E5%AE%9A%E4%B9%89\"><\/span><strong>\u7279\u60279\uff1a\u8fed\u4ee3\u5668\u534f\u8bae\u7684\u81ea\u5b9a\u4e49<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u4efb\u4f55\u5b9e\u73b0\u4e86<code>__iter__()<\/code>\u548c<code>__next__()<\/code>\u65b9\u6cd5\u7684\u5bf9\u8c61\u90fd\u662f\u8fed\u4ee3\u5668\u3002\u81ea\u5b9a\u4e49\u8fed\u4ee3\u903b\u8f91\u53ef\u4ee5\u8ba9\u4f60\u7684\u7c7b\u652f\u6301\u8fed\u4ee3\uff0c\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class&nbsp;CountDown:<br>&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;__init__(self,&nbsp;start):<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.current&nbsp;=&nbsp;start<br><br>&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;__iter__(self):<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;self<br><br>&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;__next__(self):<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;self.current&nbsp;&lt;=&nbsp;0:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;raise&nbsp;StopIteration<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.current&nbsp;-=&nbsp;1<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;self.current&nbsp;+&nbsp;1<br><br>for&nbsp;num&nbsp;in&nbsp;CountDown(5):<br>&nbsp;&nbsp;&nbsp;&nbsp;print(num)<\/code><\/pre>\n\n\n\n<p>\u8fd9\u6bb5\u4ee3\u7801\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5012\u8ba1\u65f6\u8fed\u4ee3\u5668\uff0c\u5c55\u793a\u4e86\u8fed\u4ee3\u5668\u7684\u57fa\u672c\u5b9e\u73b0\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%89%B9%E6%80%A710%EF%BC%9A%E7%94%9F%E6%88%90%E5%99%A8yield%E7%9A%84%E6%9A%82%E5%81%9C%E4%B8%8E%E6%81%A2%E5%A4%8D\"><\/span><strong>\u7279\u602710\uff1a\u751f\u6210\u5668yield\u7684\u6682\u505c\u4e0e\u6062\u590d<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u751f\u6210\u5668\u662f\u7279\u6b8a\u7684\u8fed\u4ee3\u5668\uff0c\u4f7f\u7528<code>yield<\/code>\u5173\u952e\u5b57\u6682\u505c\u51fd\u6570\u7684\u6267\u884c\uff0c\u5e76\u4fdd\u5b58\u5f53\u524d\u72b6\u6001\u3002\u5f53\u518d\u6b21\u8c03\u7528<code>next()<\/code>\u65f6\uff0c\u51fd\u6570\u4ece\u4e0a\u6b21\u505c\u6b62\u7684\u5730\u65b9\u7ee7\u7eed\u6267\u884c\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>def&nbsp;simple_generator():<br>&nbsp;&nbsp;&nbsp;&nbsp;yield&nbsp;1<br>&nbsp;&nbsp;&nbsp;&nbsp;yield&nbsp;2<br>&nbsp;&nbsp;&nbsp;&nbsp;yield&nbsp;3<br><br>gen&nbsp;=&nbsp;simple_generator()<br>print(next(gen))&nbsp;&nbsp;<em>#&nbsp;\u8f93\u51fa:&nbsp;1<\/em><br>print(next(gen))&nbsp;&nbsp;<em>#&nbsp;\u8f93\u51fa:&nbsp;2<\/em><\/code><\/pre>\n\n\n\n<p>\u751f\u6210\u5668\u5728\u5904\u7406\u5927\u6570\u636e\u6d41\u65f6\u7279\u522b\u6709\u7528\uff0c\u56e0\u4e3a\u5b83\u6309\u9700\u751f\u6210\u6570\u636e\uff0c\u8282\u7701\u5185\u5b58\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%89%B9%E6%80%A711%EF%BC%9A%E8%87%AA%E5%AE%9A%E4%B9%89with%E8%AF%AD%E5%8F%A5\"><\/span><strong>\u7279\u602711\uff1a\u81ea\u5b9a\u4e49with\u8bed\u53e5<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u901a\u8fc7\u5b9a\u4e49<code>__enter__()<\/code>\u548c<code>__exit__()<\/code>\u65b9\u6cd5\uff0c\u8ba9\u4ee3\u7801\u5757\u81ea\u52a8\u7ba1\u7406\u8d44\u6e90\uff0c\u5982\u6587\u4ef6\u64cd\u4f5c\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u6587\u4ef6\u64cd\u4f5c\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u793a\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class&nbsp;ManagedFile:<br>&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;__init__(self,&nbsp;name):<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.name&nbsp;=&nbsp;name<br><br>&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;__enter__(self):<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.file&nbsp;=&nbsp;open(self.name,&nbsp;'r')<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;self.file<br><br>&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;__exit__(self,&nbsp;exc_type,&nbsp;exc_val,&nbsp;exc_tb):<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.file.close()<br><br>with&nbsp;ManagedFile('example.txt')&nbsp;as&nbsp;f:<br>&nbsp;&nbsp;&nbsp;&nbsp;content&nbsp;=&nbsp;f.read()<\/code><\/pre>\n\n\n\n<p>\u4f7f\u7528<code>with<\/code>\u8bed\u53e5\uff0c\u53ef\u4ee5\u786e\u4fdd\u6587\u4ef6\u5728\u4f7f\u7528\u540e\u88ab\u6b63\u786e\u5173\u95ed\uff0c\u65e0\u9700\u624b\u52a8\u8c03\u7528<code>close()<\/code>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u901a\u8fc7\u4e0a\u8ff0\u5185\u5bb9\uff0c\u6211\u4eec\u63a2\u7d22\u4e86Python\u4e2d\u7684\u8fed\u4ee3\u5668\u3001\u751f\u6210\u5668\u4ee5\u53ca\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u7684\u9ad8\u7ea7\u5e94\u7528\uff0c\u8fd9\u4e9b\u7279\u6027\u6781\u5927\u63d0\u5347\u4e86\u4ee3\u7801\u7684\u4f18\u96c5\u6027\u548c\u6548\u7387\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u63ed\u5f00\u5143\u7f16\u7a0b\u7684\u9762\u7eb1\uff0c\u4e86\u89e3\u7c7b\u7684\u52a8\u6001\u521b\u5efa\u548c\u63cf\u8ff0\u7b26\u7684\u5965\u79d8\uff0c\u4ee5\u53ca\u5982\u4f55\u901a\u8fc7\u9ad8\u7ea7\u6a21\u5757\u8fdb\u4e00\u6b65\u63d0\u5347\u4f60\u7684\u7f16\u7a0b\u6280\u5de7\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%89%B9%E6%80%A712%EF%BC%9A%E7%B1%BB%E7%9A%84%E5%8A%A8%E6%80%81%E5%88%9B%E5%BB%BA\"><\/span><strong>\u7279\u602712\uff1a\u7c7b\u7684\u52a8\u6001\u521b\u5efa<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Python\u7684<code>type()<\/code>\u51fd\u6570\u4e0d\u4ec5\u7528\u4e8e\u7c7b\u578b\u67e5\u8be2\uff0c\u8fd8\u53ef\u4ee5\u7528\u6765\u52a8\u6001\u521b\u5efa\u7c7b\u3002\u8fd9\u79cd\u65b9\u5f0f\u5728\u9700\u8981\u6839\u636e\u8fd0\u884c\u65f6\u6761\u4ef6\u5b9a\u4e49\u7c7b\u65f6\u975e\u5e38\u6709\u7528\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>def&nbsp;make_class(name,&nbsp;bases,&nbsp;dict):<br>&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;type(name,&nbsp;bases,&nbsp;dict)<br><br>MyClass&nbsp;=&nbsp;make_class('MyClass',&nbsp;(object,),&nbsp;{'x':&nbsp;5})<br>instance&nbsp;=&nbsp;MyClass()<br>print(instance.x)&nbsp;&nbsp;<em>#&nbsp;\u8f93\u51fa:&nbsp;5<\/em><\/code><\/pre>\n\n\n\n<p>\u52a8\u6001\u521b\u5efa\u7c7b\u53ef\u4ee5\u8ba9\u4f60\u7684\u4ee3\u7801\u66f4\u52a0\u7075\u6d3b\uff0c\u9002\u5e94\u590d\u6742\u7684\u8bbe\u8ba1\u6a21\u5f0f\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%89%B9%E6%80%A713%EF%BC%9A%E6%8F%8F%E8%BF%B0%E7%AC%A6%E7%9A%84%E7%90%86%E8%A7%A3\"><\/span><strong>\u7279\u602713\uff1a\u63cf\u8ff0\u7b26\u7684\u7406\u89e3<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u63cf\u8ff0\u7b26\u662f\u5b9e\u73b0\u4e86\u7279\u5b9a\u534f\u8bae\u7684\u7c7b\uff0c\u901a\u8fc7\u91cd\u5199<code>__get__()<\/code>\u3001<code>__set__()<\/code>\u548c<code>__delete__()<\/code>\u65b9\u6cd5\u6765\u63a7\u5236\u5c5e\u6027\u8bbf\u95ee\u3002\u5b83\u4eec\u662f\u5b9e\u73b0\u79c1\u6709\u5c5e\u6027\u3001\u5c5e\u6027\u9a8c\u8bc1\u548c\u4ee3\u7406\u6a21\u5f0f\u7684\u57fa\u7840\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class&nbsp;DescriptorExample:<br>&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;__init__(self):<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self._value&nbsp;=&nbsp;None<br><br>&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;__get__(self,&nbsp;instance,&nbsp;owner):<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;self._value<br><br>&nbsp;&nbsp;&nbsp;&nbsp;def&nbsp;__set__(self,&nbsp;instance,&nbsp;value):<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;not&nbsp;isinstance(value,&nbsp;int):<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;raise&nbsp;ValueError(\"Value&nbsp;must&nbsp;be&nbsp;an&nbsp;integer\")<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self._value&nbsp;=&nbsp;value<br><br>class&nbsp;MyClass:<br>&nbsp;&nbsp;&nbsp;&nbsp;attr&nbsp;=&nbsp;DescriptorExample()<br><br>obj&nbsp;=&nbsp;MyClass()<br>obj.attr&nbsp;=&nbsp;10&nbsp;&nbsp;<em>#&nbsp;\u6b63\u786e<\/em><br>obj.attr&nbsp;=&nbsp;\"not&nbsp;a&nbsp;number\"&nbsp;&nbsp;<em>#&nbsp;ValueError<\/em><\/code><\/pre>\n\n\n\n<p>\u63cf\u8ff0\u7b26\u63d0\u4f9b\u4e86\u7ec6\u7c92\u5ea6\u7684\u5c5e\u6027\u8bbf\u95ee\u63a7\u5236\uff0c\u662fPython\u5bf9\u8c61\u6a21\u578b\u4e2d\u7684\u9ad8\u7ea7\u7279\u6027\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%89%B9%E6%80%A714%EF%BC%9Aospath%E7%9A%84%E9%AB%98%E7%BA%A7%E8%B7%AF%E5%BE%84%E5%A4%84%E7%90%86\"><\/span><strong>\u7279\u602714\uff1a<code>os.path<\/code>\u7684\u9ad8\u7ea7\u8def\u5f84\u5904\u7406<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><code>os.path<\/code>\u6a21\u5757\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u8def\u5f84\u64cd\u4f5c\u51fd\u6570\uff0c\u5982<code>join()<\/code>\u3001<code>splitext()<\/code>\u7b49\u3002\u5176\u4e2d\uff0c<code>normpath()<\/code>\u53ef\u4ee5\u6807\u51c6\u5316\u8def\u5f84\uff0c\u6d88\u9664\u591a\u4f59\u7684<code>.<\/code>\u3001<code>..<\/code>\u548c\u659c\u6760\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import&nbsp;os.path<br>path&nbsp;=&nbsp;\"\/path\/to\/..\/file.txt\"<br>normalized_path&nbsp;=&nbsp;os.path.normpath(path)<br>print(normalized_path)&nbsp;&nbsp;<em>#&nbsp;\u8f93\u51fa:&nbsp;\/path\/file.txt<\/em><\/code><\/pre>\n\n\n\n<p>\u8fd9\u5bf9\u4e8e\u5904\u7406\u7528\u6237\u8f93\u5165\u6216\u8de8\u5e73\u53f0\u7684\u6587\u4ef6\u8def\u5f84\u975e\u5e38\u6709\u7528\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%89%B9%E6%80%A715%EF%BC%9Adatetime%E6%A8%A1%E5%9D%97%E7%9A%84%E9%AB%98%E7%BA%A7%E6%97%A5%E6%9C%9F%E6%93%8D%E4%BD%9C\"><\/span><strong>\u7279\u602715\uff1a<code>datetime<\/code>\u6a21\u5757\u7684\u9ad8\u7ea7\u65e5\u671f\u64cd\u4f5c<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><code>datetime<\/code>\u6a21\u5757\u7684<code>timedelta<\/code>\u7c7b\u5141\u8bb8\u8fdb\u884c\u65e5\u671f\u548c\u65f6\u95f4\u7684\u52a0\u51cf\u64cd\u4f5c\uff0c\u800c<code>dateutil.relativedelta<\/code>\u63d0\u4f9b\u4e86\u66f4\u590d\u6742\u7684\u65e5\u671f\u95f4\u9694\u8ba1\u7b97\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>from&nbsp;datetime&nbsp;import&nbsp;datetime,&nbsp;timedelta<br>from&nbsp;dateutil.relativedelta&nbsp;import&nbsp;relativedelta<br><br>now&nbsp;=&nbsp;datetime.now()<br>tomorrow&nbsp;=&nbsp;now&nbsp;+&nbsp;timedelta(days=1)<br>next_month&nbsp;=&nbsp;now&nbsp;+&nbsp;relativedelta(months=1)<br>print(tomorrow)<br>print(next_month)<\/code><\/pre>\n\n\n\n<p>\u8fd9\u4e9b\u5de5\u5177\u5bf9\u4e8e\u65f6\u95f4\u76f8\u5173\u7684\u5e94\u7528\u81f3\u5173\u91cd\u8981\uff0c\u80fd\u591f\u8f7b\u677e\u5904\u7406\u590d\u6742\u7684\u65e5\u671f\u8ba1\u7b97\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u81f3\u6b64\uff0c\u6211\u4eec\u63a2\u8ba8\u4e86\u5143\u7f16\u7a0b\u3001\u9ad8\u7ea7\u6a21\u5757\u7684\u5b9e\u7528\u7279\u6027\uff0c\u4ee5\u53ca\u5982\u4f55\u5229\u7528\u5b83\u4eec\u6765\u589e\u5f3a\u7a0b\u5e8f\u7684\u529f\u80fd\u548c\u5065\u58ee\u6027\u3002\u6700\u540e\uff0c\u8ba9\u6211\u4eec\u805a\u7126\u4e8e\u5f02\u5e38\u5904\u7406\u7684\u9ad8\u7ea7\u6280\u5de7\u548c\u6027\u80fd\u4f18\u5316\u7684\u7b56\u7565\uff0c\u8fd9\u4e9b\u90fd\u662f\u7f16\u5199\u9ad8\u8d28\u91cfPython\u4ee3\u7801\u7684\u5173\u952e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f15\u8a00 Python\uff0c\u4ee5\u5176\u7b80\u6d01\u660e\u4e86\u7684\u8bed\u6cd5\u548c\u5f3a\u5927\u7684\u5e93\u652f\u6301\uff0c\u6210\u4e3a\u521d\u5b66\u8005\u4e0e\u4e13\u5bb6\u90fd\u7231\u4e0d\u91ca\u624b\u7684\u8bed\u8a00\u3002\u4f46\u9690\u85cf\u5728\u5b83\u5e73&hellip; <a href=\"http:\/\/viplao.com\/index.php\/2024\/11\/25\/python%e5%9f%ba%e7%a1%80%e6%8a%80%e8%83%bd-python%e4%b8%ad20%e4%b8%aa%e4%b8%8d%e4%b8%ba%e4%ba%ba%e7%9f%a5%e7%9a%84%e9%ab%98%e7%ba%a7%e7%89%b9%e6%80%a7\/\" class=\"more-link read-more\" rel=\"bookmark\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">PYTHON\u57fa\u7840\u6280\u80fd \u2013\u00a0Python\u4e2d20\u4e2a\u4e0d\u4e3a\u4eba\u77e5\u7684\u9ad8\u7ea7\u7279\u6027<\/span><i class=\"fa fa-arrow-right\"><\/i><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[28],"views":1014,"_links":{"self":[{"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/posts\/2941"}],"collection":[{"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/comments?post=2941"}],"version-history":[{"count":1,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/posts\/2941\/revisions"}],"predecessor-version":[{"id":2942,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/posts\/2941\/revisions\/2942"}],"wp:attachment":[{"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/media?parent=2941"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/categories?post=2941"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/tags?post=2941"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}