{"id":18096,"date":"2023-02-22T17:25:20","date_gmt":"2023-02-22T09:25:20","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=18096"},"modified":"2023-07-30T22:57:58","modified_gmt":"2023-07-30T14:57:58","slug":"python-%e5%88%a9%e7%94%a8%e5%8f%af%e5%8f%98%e5%8f%82%e6%95%b0%e4%bc%a0%e5%85%a5list%e5%b9%b6%e6%89%93%e5%8d%b0%ef%bc%8c%e4%b8%8e%e7%9b%b4%e6%8e%a5%e7%94%a8for%e5%be%aa%e7%8e%af%e6%89%93%e5%8d%b0","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/18096.html","title":{"rendered":"python \u5229\u7528\u53ef\u53d8\u53c2\u6570\u4f20\u5165list\u5e76\u6253\u5370\uff0c\u4e0e\u76f4\u63a5\u7528for\u5faa\u73af\u6253\u5370\u6709\u4ec0\u4e48\u533a\u522b"},"content":{"rendered":"<blockquote class=\"wp-block-quote\">\n<p>python \u5229\u7528\u53ef\u53d8\u53c2\u6570\u4f20\u5165list\u5e76\u6253\u5370\uff0c\u4e0e\u76f4\u63a5\u7528for\u5faa\u73af\u6253\u5370\u7684\u533a\u522b\u662f\uff1a\u51fd\u6570\u5b9a\u4e49\u4e2d\u5c06\u53c2\u6570\u6536\u96c6\uff0c\u56e0\u6b64\u8c03\u7528\u51fd\u6570\u65f6\u5217\u8868a\u4f1a\u4ee5\u5143\u7ec4(a,)\u5f15\u7528\uff0c\u6253\u5370\u7684\u65f6\u5019\u5c31\u662f\u6253\u5370\u5143\u7ec4\u7684\u5143\u7d20\u5217\u8868a\uff0c\u4f60\u53ef\u4ee5\u5728\u51fd\u6570\u5b9a\u4e49\u4e2d\u8865\u6253\u5370n\uff0c\u4f1a\u53d1\u73b0n\u7b49\u4e8e1\u3002<\/p>\n<\/blockquote>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img fetchpriority=\"high\" alt=\"\" class=\"wp-image-18097\" decoding=\"async\" height=\"421\" sizes=\"(max-width: 680px) 100vw, 680px\" src=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/02\/\u6dfb\u52a0\u6807\u9898-17-14.png?x-oss-process=image\/auto-orient,1\/format,webp\" srcset=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/02\/\u6dfb\u52a0\u6807\u9898-17-14.png?x-oss-process=image\/auto-orient,1\/format,webp 680w, https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/02\/\u6dfb\u52a0\u6807\u9898-17-14-300x186.png 300w\" width=\"680\"\/><\/figure>\n<\/div>\n<h2 class=\"wp-block-heading\"><strong>\u4e00\u3001python \u5229\u7528\u53ef\u53d8\u53c2\u6570\u4f20\u5165list\u5e76\u6253\u5370\uff0c\u4e0e\u76f4\u63a5\u7528for\u5faa\u73af\u6253\u5370\u7684\u533a\u522b<\/strong><\/h2>\n<p>\u51fd\u6570\u5b9a\u4e49\u4e2d\u5c06\u53c2\u6570\u6536\u96c6\uff0c\u56e0\u6b64\u8c03\u7528\u51fd\u6570\u65f6\u5217\u8868a\u4f1a\u4ee5\u5143\u7ec4(a,)\u5f15\u7528\uff0c\u6253\u5370\u7684\u65f6\u5019\u5c31\u662f\u6253\u5370\u5143\u7ec4\u7684\u5143\u7d20\u5217\u8868a\uff0c\u4f60\u53ef\u4ee5\u5728\u51fd\u6570\u5b9a\u4e49\u4e2d\u8865\u6253\u5370n\uff0c\u4f1a\u53d1\u73b0n\u7b49\u4e8e1\u3002<\/p>\n<h3 class=\"wp-block-heading\"><strong>\u5728python\u7684List\u4e2d\u4f7f\u7528for\u5faa\u73af\u8bed\u53e5\u7684\u6280\u5de7<\/strong><\/h3>\n<h3 class=\"wp-block-heading\"><strong>1. <\/strong><strong>\u7b80\u5355\u66ff\u6362for\u5faa\u73af<\/strong><\/h3>\n<p>\u5b83\u7684\u4e3b\u8981\u8bed\u6cd5\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n<p>my_list=[ \u8868\u8fbe\u5f0f for \u5faa\u73af\u9879 in \u5faa\u73af\u4f53 (if \u6761\u4ef6) ]<\/p>\n<p>\u8fd9\u91cc\u8868\u8fbe\u5f0f\u53ef\u4ee5\u4e3a\u5faa\u73af\u9879\uff0c\u4e5f\u53ef\u4ee5\u4e3a\u5faa\u73af\u9879\u7684\u51fd\u6570\u6216\u8005\u65b9\u6cd5\uff0c\u4e0b\u9762\u6211\u4eec\u770b\u7ed9\u4f8b\u5b50\uff1a<\/p>\n<p>name = \u201cDonald Trump\u201d<\/p>\n<p>#list\u5185\u7684for\u5faa\u73af\u8bed\u6cd5,\u53ea\u4f7f\u7528\u4e00\u53e5\u4ee3\u7801<\/p>\n<p>my_list = [c for c in name]<\/p>\n<p>print(name)<\/p>\n<p>print(my_list)<\/p>\n<p>\u4f20\u7edf\u7684for \u5faa\u73af\u8bed\u6cd5\u662f\u8fd9\u4e48\u5199\u7684\uff1a<\/p>\n<p>name = \u201cDonald Trump\u201d<\/p>\n<p>#\u4f20\u7edffor\u5faa\u73af\u8bed\u6cd5,\u9700\u8981\u4f7f\u7528\u4e09\u53e5\u4ee3\u7801<\/p>\n<p>my_list=[]<\/p>\n<p>for c in name:<\/p>\n<p>\u00a0\u00a0\u00a0 my_list.append(c)<\/p>\n<p>print(name)\u00a0\u00a0<\/p>\n<p>print(my_list)<\/p>\n<p>\u5728\u8fd9\u91cc\u4f20\u7edf\u7684for\u5faa\u73af\u9700\u8981\u4f7f\u7528\u4e09\u53e5\u4ee3\u7801, \u800clist\u5185\u7684for\u5faa\u73af\u53ea\u4f7f\u7528\u4e86\u4e00\u53e5\u4ee3\u7801\u5b9e\u73b0\u4e86\u540c\u6837\u7684\u529f\u80fd\uff0c\u6211\u4eec\u518d\u770b\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<p>array = [[16, 3, 7],<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 [2, 24, 9],<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0[4, 1, 12]]<\/p>\n<p>#\u8868\u8fbe\u5f0f\u53ef\u4ee5\u4e3a\u5faa\u73af\u9879\u7684\u51fd\u6570<\/p>\n<p>row_min = [min(row) for row in array ]<\/p>\n<p>print(row_min)<\/p>\n<p>\u4e0a\u9762\u4ee3\u7801\u7684\u4f5c\u7528\u662f\u627e\u51fa\u4e8c\u7ef4\u6570\u7ec4array(\u5176\u5b9e\u662flist\u5185\u5d4clist)\u6bcf\u4e00\u884c\u7684\u6700\u5c0f\u503c\uff0c\u540c\u6837\u4e5f\u53ea\u4f7f\u7528\u4e86\u4e00\u53e5\u4ee3\u7801\u3002<\/p>\n<h3 class=\"wp-block-heading\"><strong>2.<\/strong><strong>\u5728list\u5185\u7684\u5faa\u73af\u4e2d\u4f7f\u7528if \u6761\u4ef6<\/strong><\/h3>\n<p>names_list = [\u201cWashington\u201d, \u201cTrump\u201d, \u201cObama\u201d, \u201cbush\u201d, \u201cClinton\u201d, \u201cReagan\u201d]<\/p>\n<p>l1 = [name for name in names_list if name.startswith(\u2018W\u2019)]<\/p>\n<p>l2 = [name for name in names_list if name.startswith(\u2018W\u2019) or len(name) &lt; 5]<\/p>\n<p>l3 = [name for name in names_list if len(name) &lt; 5 and name.islower()]<\/p>\n<p>print(l1, l2, l3)<\/p>\n<p>\u6211\u4eec\u53d1\u73b0\u5728list\u5faa\u73af\u4e2d\u4e5f\u53ef\u4ee5\u5f88\u65b9\u4fbf\u7684\u4f7f\u7528if\u6761\u4ef6 \u8fd9\u91cc\u6211\u4eec\u5728for\u5faa\u73af\u7684\u5c3e\u90e8\u4f7f\u7528\u4e86if\u6761\u4ef6\u8bed\u53e5\uff0c\u5982\u679c\u6362\u6210\u4f20\u7edf\u7684for\u5faa\u73af\u8bed\u6cd5\u53ef\u80fd\u53c8\u8981\u589e\u52a0\u8bb8\u591a\u884c\u4e1a\u4ee3\u7801\u4e86\u3002<\/p>\n<h3 class=\"wp-block-heading\"><strong>3. <\/strong><strong>\u4f7f\u7528\u66f4\u52a0\u590d\u6742\u7684\u8868\u8fbe\u5f0f<\/strong><\/h3>\n<p>names_list = [\u201cwashington\u201d, \u201ctrump\u201d, \u201cobama\u201d, \u201cbush\u201d, \u201cclinton\u201d, \u201creagan\u201d]<\/p>\n<p>#\u5c06\u4eba\u540d\u9996\u5b57\u6bcd\u5927\u5199<\/p>\n<p>new_names = [name.capitalize() for name in names_list]<\/p>\n<p>print(new_names)<\/p>\n<p>\u8fd9\u91cc\u6211\u4eeclist\u5185\u7684\u8868\u8fbe\u5f0f\u4f7f\u7528\u4e86\u5faa\u73af\u9879name\u7684\u65b9\u6cd5capitalize(), \u6211\u4eec\u518d\u770b\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<p>my_list=[ \u8868\u8fbe\u5f0f(if\u2026else \u6761\u4ef6) for \u5faa\u73af\u9879 in \u5faa\u73af\u4f53 ]<\/p>\n<p>names_list = [\u201cWashington\u201d, \u201cTrump\u201d, \u201cObama\u201d, \u201cbush\u201d, \u201cClinton\u201d, \u201cReagan\u201d]<\/p>\n<p>#\u5728\u8868\u8fbe\u5f0f\u4e2d\u4f7f\u7528if\u6761\u4ef6<\/p>\n<p>new_names = [name if name.startswith(\u2018T\u2019) else \u2018Not President\u2019 for name in names_list]<\/p>\n<p>print(new_names)<\/p>\n<p>\u4e4b\u524d\u6211\u4eec\u662f\u5728for\u5faa\u73af\u7684\u5c3e\u90e8\u6dfb\u52a0if \u6761\u4ef6\uff0c\u4e0d\u8fc7\u6211\u4eec\u4e5f\u53ef\u4ee5\u5728\u8868\u8fbe\u5f0f\u4e2d\u4f7f\u7528if\u6761\u4ef6\u8bed\u53e5\u3002\u8fd9\u91cc\u9700\u8981\u6307\u51fa\u7684\u662f\u8868\u8fbe\u5f0f\u5185\u7684if\u6761\u4ef6\u8bed\u53e5\u4e2d\u5fc5\u987b\u8981\u540c\u65f6\u4f7f\u7528else\u8bed\u53e5\uff0c\u8fd9\u548c\u4e4b\u524d\u5728for\u5faa\u73af\u5c3e\u90e8\u6dfb\u52a0if\u6761\u4ef6\u6709\u6240\u4e0d\u540c\uff0c\u8fd9\u662f\u56e0\u4e3a\u5728\u8868\u8fbe\u5f0f\u5185\u7684if\u8bed\u53e5\u5fc5\u987b\u9075\u5faa\u7ed9\u53d8\u91cf\u8d4b\u503c\u7684python\u8bed\u6cd5\u5982\uff1a<\/p>\n<p>a = 1<\/p>\n<p>b = 2 if a&gt;0 # \u8bed\u6cd5\u9519\u8bef<\/p>\n<p>b = 2 if a &gt; 0 else -1\u00a0<\/p>\n<p>4.\u4f7f\u7528\u5d4c\u5957for\u5faa\u73af\u8bed\u6cd5<\/p>\n<p>\u53ef\u4ee5\u5728list\u5185\u4f7f\u7528\u5d4c\u5957for\u5faa\u73af\u8bed\u6cd5\uff0c\u4e0b\u9762\u6211\u4eec\u770b\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<p>names_list = [\u201cTrump\u201d, \u201cObama\u201d,\u201dClinton\u201d]<\/p>\n<p>#\u53cc\u91cdfor\u5faa\u73af<\/p>\n<p>chars = [c for name in names_list for c in name]<\/p>\n<p>print(chars)<\/p>\n<p><strong>\u5ef6\u4f38\u9605\u8bfb\uff1a<\/strong><\/p>\n<h2 class=\"wp-block-heading\"><strong>\u4e8c\u3001java\u63a5\u53e3\u7684\u4fee\u9970\u7b26<\/strong><\/h2>\n<p>\uff081\uff09\u63a5\u53e3\u7528\u4e8e\u63cf\u8ff0\u7cfb\u7edf\u5bf9\u5916\u63d0\u4f9b\u7684\u6240\u6709\u670d\u52a1\uff0c\u56e0\u6b64\u63a5\u53e3\u4e2d\u7684\u6210\u5458\u5e38\u91cf\u548c\u65b9\u6cd5\u90fd\u5fc5\u987b\u662f\u516c\u5f00(public)\u7c7b\u578b\u7684\uff0c\u786e\u4fdd\u5916\u90e8\u4f7f\u7528\u8005\u80fd\u8bbf\u95ee\u5b83\u4eec\uff1b<\/p>\n<p>\uff082\uff09\u63a5\u53e3\u4ec5\u4ec5\u63cf\u8ff0\u7cfb\u7edf\u80fd\u505a\u4ec0\u4e48\uff0c\u4f46\u4e0d\u6307\u660e\u5982\u4f55\u53bb\u505a\uff0c\u6240\u4ee5\u63a5\u53e3\u4e2d\u7684\u65b9\u6cd5\u90fd\u662f\u62bd\u8c61(abstract)\u65b9\u6cd5\uff1b<\/p>\n<p>\uff083\uff09\u63a5\u53e3\u4e0d\u6d89\u53ca\u548c\u4efb\u4f55\u5177\u4f53\u5b9e\u4f8b\u76f8\u5173\u7684\u7ec6\u8282\uff0c\u56e0\u6b64\u63a5\u53e3\u6ca1\u6709\u6784\u9020\u65b9\u6cd5\uff0c\u4e0d\u80fd\u88ab\u5b9e\u4f8b\u5316,\u6ca1\u6709\u5b9e\u4f8b\u53d8\u91cf\uff0c\u53ea\u6709\u9759\u6001\uff08static\uff09\u53d8\u91cf\uff1b<\/p>\n<p>\uff084\uff09\u63a5\u53e3\u7684\u4e2d\u7684\u53d8\u91cf\u662f\u6240\u6709\u5b9e\u73b0\u7c7b\u5171\u6709\u7684\uff0c\u65e2\u7136\u5171\u6709\uff0c\u80af\u5b9a\u662f\u4e0d\u53d8\u7684\u4e1c\u897f\uff0c\u56e0\u4e3a\u53d8\u5316\u7684\u4e1c\u897f\u4e5f\u4e0d\u80fd\u591f\u7b97\u5171\u6709\u3002\u6240\u4ee5\u53d8\u91cf\u662f\u4e0d\u53ef\u53d8(final)\u7c7b\u578b\uff0c\u4e5f\u5c31\u662f\u5e38\u91cf\u4e86\u3002<\/p>\n<p>\uff085\uff09 \u63a5\u53e3\u4e2d\u4e0d\u53ef\u4ee5\u5b9a\u4e49\u53d8\u91cf\uff1f\u5982\u679c\u63a5\u53e3\u53ef\u4ee5\u5b9a\u4e49\u53d8\u91cf\uff0c\u4f46\u662f\u63a5\u53e3\u4e2d\u7684\u65b9\u6cd5\u53c8\u90fd\u662f\u62bd\u8c61\u7684\uff0c\u5728\u63a5\u53e3\u4e2d\u65e0\u6cd5\u901a\u8fc7\u884c\u4e3a\u6765\u4fee\u6539\u5c5e\u6027\u3002\u6709\u7684\u4eba\u4f1a\u8bf4\u4e86\uff0c\u6ca1\u6709\u5173\u7cfb\uff0c\u53ef\u4ee5\u901a\u8fc7 \u5b9e\u73b0\u63a5\u53e3\u7684\u5bf9\u8c61\u7684\u884c\u4e3a\u6765\u4fee\u6539\u63a5\u53e3\u4e2d\u7684\u5c5e\u6027\u3002\u8fd9\u5f53\u7136\u6ca1\u6709\u95ee\u9898\uff0c\u4f46\u662f\u8003\u8651\u8fd9\u6837\u7684\u60c5\u51b5\u3002\u5982\u679c\u63a5\u53e3 A \u4e2d\u6709\u4e00\u4e2apublic \u8bbf\u95ee\u6743\u9650\u7684\u9759\u6001\u53d8\u91cf a\u3002\u6309\u7167 Java \u7684\u8bed\u4e49\uff0c\u6211\u4eec\u53ef\u4ee5\u4e0d\u901a\u8fc7\u5b9e\u73b0\u63a5\u53e3\u7684\u5bf9\u8c61\u6765\u8bbf\u95ee\u53d8\u91cf a\uff0c\u901a\u8fc7 A.a = xxx; \u5c31\u53ef\u4ee5\u6539\u53d8\u63a5\u53e3\u4e2d\u7684\u53d8\u91cf a \u7684\u503c\u4e86\u3002\u6b63\u5982\u62bd\u8c61\u7c7b\u4e2d\u662f\u53ef\u4ee5\u8fd9\u6837\u505a\u7684\uff0c\u90a3\u4e48\u5b9e\u73b0\u63a5\u53e3 A \u7684\u6240\u6709\u5bf9\u8c61\u4e5f\u90fd\u4f1a\u81ea\u52a8\u62e5\u6709\u8fd9\u4e00\u6539\u53d8\u540e\u7684 a \u7684\u503c\u4e86\uff0c\u4e5f\u5c31\u662f\u8bf4\u4e00\u4e2a\u5730\u65b9\u6539\u53d8\u4e86 a\uff0c\u6240\u6709\u8fd9\u4e9b\u5bf9\u8c61\u4e2d a \u7684\u503c\u4e5f\u90fd\u8ddf\u7740\u53d8\u4e86\u3002\u8fd9\u548c\u62bd\u8c61\u7c7b\u6709\u4ec0\u4e48\u533a\u522b\u5462\uff0c\u600e\u4e48\u4f53\u73b0\u63a5\u53e3\u66f4\u9ad8\u7684\u62bd\u8c61\u7ea7\u522b\u5462\uff0c\u600e\u4e48\u4f53\u73b0\u63a5\u53e3\u63d0\u4f9b\u7684\u7edf\u4e00\u7684\u534f\u8bae\u5462\uff0c\u90a3\u8fd8\u8981\u63a5\u53e3\u8fd9\u79cd\u62bd\u8c61\u6765\u505a\u4ec0\u4e48\u5462\uff1f\u6240\u4ee5\u63a5\u53e3\u4e2d 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