{"id":5456,"date":"2022-04-02T21:21:03","date_gmt":"2022-04-02T13:21:03","guid":{"rendered":"https:\/\/egonlin.com\/?p=5456"},"modified":"2022-04-02T21:21:03","modified_gmt":"2022-04-02T13:21:03","slug":"04-04-%e7%a8%8b%e5%ba%8f%e7%9a%84%e5%be%aa%e7%8e%af%e7%bb%93%e6%9e%84","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=5456","title":{"rendered":"04-04 \u7a0b\u5e8f\u7684\u5faa\u73af\u7ed3\u6784"},"content":{"rendered":"<h1>\u4e00\u3001\u6982\u8ff0<\/h1>\n<ul>\n<li>\u904d\u5386\u5faa\u73af<\/li>\n<li>\u65e0\u9650\u5faa\u73af<\/li>\n<li>\u5faa\u73af\u63a7\u5236\u4fdd\u7559\u5b57<\/li>\n<li>\u5faa\u73af\u7684\u9ad8\u7ea7\u7528\u6cd5<\/li>\n<\/ul>\n<h1>\u4e8c\u3001\u904d\u5386\u5faa\u73af<\/h1>\n<p>\u904d\u5386\u67d0\u4e2a\u7ed3\u6784\u5f62\u6210\u7684\u5faa\u73af\u8fd0\u884c\u65b9\u5f0f<\/p>\n<pre><code class=\"language-python\">for &lt;\u5faa\u73af\u53d8\u91cf&gt; in &lt;\u904d\u5386\u7ed3\u6784&gt;:\n    &lt;\u8bed\u53e5\u5757&gt;<\/code><\/pre>\n<ul>\n<li>\u4ece\u904d\u5386\u7ed3\u6784\u4e2d\u9010\u4e00\u63d0\u53d6\u5143\u7d20\uff0c\u653e\u5728\u5faa\u73af\u53d8\u91cf\u4e2d<\/li>\n<li>\u7531\u4fdd\u7559\u5b57<code>for<\/code>\u548c<code>in<\/code>\u7ec4\u6210\uff0c\u5b8c\u6574\u904d\u5386\u6240\u6709\u5143\u7d20\u540e\u7ed3\u675f<\/li>\n<li>\u6bcf\u6b21\u5faa\u73af\uff0c\u6240\u83b7\u5f97\u5143\u7d20\u653e\u5165\u5faa\u73af\u53d8\u91cf\uff0c\u5e76\u6267\u884c<\/li>\n<\/ul>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2022\/04\/\u7a0b\u5e8f\u7684\u5faa\u73af\u7ed3\u67841.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/04\/\u7a0b\u5e8f\u7684\u5faa\u73af\u7ed3\u67841.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<h1>\u4e09\u3001\u904d\u5386\u5faa\u73af\u7684\u5e94\u7528<\/h1>\n<h2>3.1 \u8ba1\u6570\u5faa\u73af(N\u6b21)<\/h2>\n<pre><code class=\"language-python\">fro i in range(N):\n    &lt;\u8bed\u53e5\u5757&gt;<\/code><\/pre>\n<ul>\n<li>\u904d\u5386\u7531<code>range()<\/code>\u51fd\u6570\u4ea7\u751f\u7684\u6570\u5b57\u5e8f\u5217\uff0c\u4ea7\u751f\u5faa\u73af<\/li>\n<\/ul>\n<pre><code class=\"language-python\">for i in range(5):\n    print(i)\n0\n1\n2\n3\n4\nfor i in range(5):\n    print(&#039;hello:&#039;, i)\nhello: 0\nhello: 1\nhello: 2\nhello: 3\nhello: 4<\/code><\/pre>\n<h2>3.2 \u8ba1\u6570\u5faa\u73af(\u7279\u5b9a\u6b21)<\/h2>\n<pre><code class=\"language-python\">fro i in range(M,N,K):\n    &lt;\u8bed\u53e5\u5757&gt;<\/code><\/pre>\n<ul>\n<li>\u904d\u5386\u7531<code>range()<\/code>\u51fd\u6570\u4ea7\u751f\u7684\u6570\u5b57\u5e8f\u5217\uff0c\u4ea7\u751f\u5faa\u73af<\/li>\n<\/ul>\n<pre><code class=\"language-python\">for i in range(1, 6):\n    print(i)\n1\n2\n3\n4\n5\nfor i in range(1, 6, 2):\n    print(&#039;hello:&#039;, i)\nhello: 1\nhello: 3\nhello: 5<\/code><\/pre>\n<h2>3.3 \u5b57\u7b26\u4e32\u904d\u5386\u5faa\u73af<\/h2>\n<pre><code class=\"language-python\">for c  in  s: \n    &lt;\u8bed\u53e5\u5757&gt;<\/code><\/pre>\n<ul>\n<li>s\u662f\u5b57\u7b26\u4e32\uff0c\u904d\u5386\u5b57\u7b26\u4e32\u6bcf\u4e2a\u5b57\u7b26\uff0c\u4ea7\u751f\u5faa\u73af<\/li>\n<\/ul>\n<pre><code class=\"language-python\">for c in &#039;python&#039;:\n    print(c, end=&#039;,&#039;)\np,y,t,h,o,n,<\/code><\/pre>\n<h2>3.4 \u5217\u8868\u904d\u5386\u5faa\u73af<\/h2>\n<pre><code class=\"language-python\">for item  in  ls:\n    &lt;\u8bed\u53e5\u5757&gt;<\/code><\/pre>\n<ul>\n<li>ls\u662f\u4e00\u4e2a\u5217\u8868\uff0c\u904d\u5386\u5176\u6bcf\u4e2a\u5143\u7d20\uff0c\u4ea7\u751f\u5faa\u73af<\/li>\n<\/ul>\n<pre><code class=\"language-python\">for item in [123, &quot;PY&quot;, 456]:\n    print(item, end=&quot;,&quot;)\n123,PY,456,<\/code><\/pre>\n<h2>3.5 \u6587\u4ef6\u904d\u5386\u5faa\u73af<\/h2>\n<pre><code class=\"language-python\">for line in  fi:\n    &lt;\u8bed\u53e5\u5757&gt;<\/code><\/pre>\n<ul>\n<li>fi\u662f\u4e00\u4e2a\u6587\u4ef6\u6807\u8bc6\u7b26\uff0c\u904d\u5386\u5176\u6bcf\u884c\uff0c\u4ea7\u751f\u5faa\u73af<\/li>\n<\/ul>\n<pre><code class=\"language-python\"># fi.txt\n\u4f18\u7f8e\u80dc\u4e8e\u4e11\u964b\n\u660e\u4e86\u80dc\u4e8e\u9690\u6666\n\u7b80\u6d01\u80dc\u4e8e\u590d\u6742\nfor line in fi:\n    print(line)\n\u4f18\u7f8e\u80dc\u4e8e\u4e11\u964b\n\u660e\u4e86\u80dc\u4e8e\u9690\u6666\n\u7b80\u6d01\u80dc\u4e8e\u590d\u6742<\/code><\/pre>\n<h1>\u56db\u3001\u65e0\u9650\u5faa\u73af<\/h1>\n<p>\u7531\u6761\u4ef6\u63a7\u5236\u7684\u5faa\u73af\u8fd0\u884c\u65b9\u5f0f<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2022\/04\/\u7a0b\u5e8f\u7684\u5faa\u73af\u7ed3\u67842.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/04\/\u7a0b\u5e8f\u7684\u5faa\u73af\u7ed3\u67842.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<ul>\n<li>\u53cd\u590d\u6267\u884c\u8bed\u53e5\u5757\uff0c\u76f4\u5230\u6761\u4ef6\u4e0d\u6ee1\u8db3\u65f6\u7ed3\u675f<\/li>\n<\/ul>\n<pre><code class=\"language-python\">a = 3\nwhile a &gt; 0:\n    a = a - 1\n    print(a)\n2\n1\n0\n# \u6b7b\u5faa\u73af\uff0c (CTRL + C \u9000\u51fa\u6267\u884c) \na = 3\nwhile a &gt; 0:\n    a = a + 1\n    print(a)<\/code><\/pre>\n<h1>\u4e94\u3001\u5faa\u73af\u63a7\u5236\u4fdd\u7559\u5b57<\/h1>\n<h2>5.1 break \u548c continue<\/h2>\n<ul>\n<li>break\u8df3\u51fa\u5e76\u7ed3\u675f\u5f53\u524d\u6574\u4e2a\u5faa\u73af\uff0c\u6267\u884c\u5faa\u73af\u540e\u7684\u8bed\u53e5<\/li>\n<li>continue\u7ed3\u675f\u5f53\u6b21\u5faa\u73af\uff0c\u7ee7\u7eed\u6267\u884c\u540e\u7eed\u6b21\u6570\u5faa\u73af<\/li>\n<li>break\u548ccontinue\u53ef\u4ee5\u4e0efor\u548cwhile\u5faa\u73af\u642d\u914d\u4f7f\u7528<\/li>\n<\/ul>\n<h3>5.1.1 for<\/h3>\n<pre><code class=\"language-python\">for c in &quot;PYTHON&quot;:\n    if c == &#039;T&#039;:\n        continue\n    print(c, end=&#039;,&#039;)\nP,Y,H,O,N,\nfor c in &quot;PYTHON&quot;:\n    if c == &#039;T&#039;:\n        break\n    print(c, end=&#039;,&#039;)\nP,Y,<\/code><\/pre>\n<h3>5.1.2 while<\/h3>\n<ul>\n<li>break\u4ec5\u8df3\u51fa\u5f53\u524d\u6700\u5185\u5c42\u5faa\u73af<\/li>\n<\/ul>\n<pre><code class=\"language-python\">s = &quot;PYTHON&quot;\nwhile s != &quot;&quot;:\n    for c in s:\n        print(c, end=&#039;,&#039;)\n    s = s[:-1]\nP,Y,T,H,O,N,P,Y,T,H,O,P,Y,T,H,P,Y,T,P,Y,P,\ns = &quot;PYTHON&quot;\nwhile s != &quot;&quot;:\n    for c in s:\n        if c == &#039;T&#039;:\n            break\n        print(c, end=&#039;,&#039;)\n    s = s[:-1]\nP,Y,P,Y,P,Y,P,Y,P,Y,P,<\/code><\/pre>\n<h1>\u516d\u3001\u5faa\u73af\u7684\u9ad8\u7ea7\u7528\u6cd5<\/h1>\n<h2>6.1 \u5faa\u73af\u7684\u6269\u5c55<\/h2>\n<p>\u5faa\u73af\u4e0eelse<\/p>\n<h3>6.1.1 for<\/h3>\n<pre><code class=\"language-python\">for &lt;\u53d8\u91cf&gt; in &lt;\u904d\u5386\u7ed3\u6784&gt;:\n    &lt;\u8bed\u53e5\u57571&gt;\nelse:\n    &lt;\u8bed\u53e5\u57572&gt;<\/code><\/pre>\n<h3>6.1.2 while<\/h3>\n<pre><code class=\"language-python\">while &lt;\u6761\u4ef6&gt;:\n    &lt;\u8bed\u53e5\u57571&gt;\nelse:\n    &lt;\u8bed\u53e5\u57572&gt;<\/code><\/pre>\n<ul>\n<li>\u5f53\u5faa\u73af\u6ca1\u6709\u88abbreak\u8bed\u53e5\u9000\u51fa\u65f6\uff0c\u6267\u884celse\u8bed\u53e5\u5757<\/li>\n<li>else\u8bed\u53e5\u5757\u4f5c\u4e3a&quot;\u6b63\u5e38&quot;\u5b8c\u6210\u5faa\u73af\u7684\u5956\u52b1<\/li>\n<li>\u8fd9\u91ccelse\u7684\u7528\u6cd5\u4e0e\u5f02\u5e38\u5904\u7406\u4e2delse\u7528\u6cd5\u76f8\u4f3c<\/li>\n<\/ul>\n<pre><code class=\"language-python\">for c in &quot;PYTHON&quot;:\n    if c == &quot;T&quot;:\n        continue\n    print(c, end=&quot;&quot;)\nelse:\n    print(&quot;\u6b63\u5e38\u9000\u51fa&quot;)\nPYHON\u6b63\u5e38\u9000\u51fa\nfor c in &quot;PYTHON&quot;:\n    if c == &quot;T&quot;:\n        break\n    print(c, end=&quot;&quot;)\nelse:\n    print(&quot;\u6b63\u5e38\u9000\u51fa&quot;)\nPY<\/code><\/pre>\n<h1>\u4e03\u3001\u5355\u5143\u5c0f\u7ed3<\/h1>\n<ul>\n<li><code>for\u2026in<\/code> \u904d\u5386\u5faa\u73af\uff1a\u8ba1\u6570\u3001\u5b57\u7b26\u4e32\u3001\u5217\u8868\u3001\u6587\u4ef6\u2026<\/li>\n<li><code>while<\/code>\u65e0\u9650\u5faa\u73af<\/li>\n<li><code>continue<\/code>\u548c<code>break<\/code>\u4fdd\u7559\u5b57\uff1a\u9000\u51fa\u5f53\u524d\u5faa\u73af\u5c42\u6b21<\/li>\n<li>\u5faa\u73afelse\u7684\u9ad8\u7ea7\u7528\u6cd5\uff1a\u4e0e<code>break<\/code>\u6709\u5173<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3001\u6982\u8ff0 \u904d\u5386\u5faa\u73af \u65e0\u9650\u5faa\u73af \u5faa\u73af\u63a7\u5236\u4fdd\u7559\u5b57 \u5faa\u73af\u7684\u9ad8\u7ea7\u7528\u6cd5 \u4e8c\u3001\u904d\u5386\u5faa\u73af \u904d\u5386\u67d0\u4e2a\u7ed3\u6784\u5f62\u6210\u7684\u5faa\u73af\u8fd0\u884c\u65b9\u5f0f f [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":5458,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[371,375],"tags":[],"_links":{"self":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/5456"}],"collection":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5456"}],"version-history":[{"count":0,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/5456\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/media\/5458"}],"wp:attachment":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5456"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5456"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5456"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}