{"id":1196,"date":"2020-06-14T12:23:57","date_gmt":"2020-06-14T04:23:57","guid":{"rendered":"http:\/\/www.tansoo.cn\/?p=1196"},"modified":"2020-06-26T23:10:10","modified_gmt":"2020-06-26T15:10:10","slug":"python%e5%ad%97%e5%85%b8%e6%8e%a8%e5%af%bc%e5%bc%8f%ef%bc%88dict-comprehensions%ef%bc%89","status":"publish","type":"post","link":"http:\/\/www.tansoo.cn\/?p=1196","title":{"rendered":"python\u5b57\u5178\u63a8\u5bfc\u5f0f\uff08dict comprehensions\uff09"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>\u5b57\u5178\u63a8\u5bfc\u5f0f\uff08dict comprehensions\uff09<\/strong><br \/>\u5b57\u5178\u63a8\u5bfc\u548c\u5217\u8868\u63a8\u5bfc\u7684\u4f7f\u7528\u65b9\u6cd5\u662f\u7c7b\u4f3c\u7684\u3002\u8fd9\u91cc\u6709\u4e2a\u6211\u6700\u8fd1\u53d1\u73b0\u7684\u4f8b\u5b50\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">mcase = {'a': 10, 'b': 34, 'A': 7, 'Z': 3}\n\nmcase_frequency = {\nk.lower(): mcase.get(k.lower(), 0) + mcase.get(k.upper(), 0)\nfor k in mcase.keys()\n}\n\n# mcase_frequency == {'a': 17, 'z': 3, 'b': 34}<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\u6211\u4eec\u628a\u540c\u4e00\u4e2a\u5b57\u6bcd\u4f46\u4e0d\u540c\u5927\u5c0f\u5199\u7684\u503c\u5408\u5e76\u8d77\u6765\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c31\u6211\u4e2a\u4eba\u6765\u8bf4\u6ca1\u6709\u5927\u91cf\u4f7f\u7528\u5b57\u5178\u63a8\u5bfc\u5f0f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f60\u8fd8\u53ef\u4ee5\u5feb\u901f\u5bf9\u6362\u4e00\u4e2a\u5b57\u5178\u7684\u952e\u548c\u503c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>{v: k for k, v in some_dict.items()}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b57\u5178\u63a8\u5bfc\u5f0f\uff08dict comprehensions\uff09\u5b57\u5178\u63a8\u5bfc\u548c\u5217\u8868\u63a8\u5bfc\u7684\u4f7f\u7528\u65b9\u6cd5\u662f\u7c7b\u4f3c\u7684\u3002\u8fd9\u91cc\u6709\u4e2a\u6211\u6700\u8fd1\u53d1\u73b0\u7684 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[70],"class_list":["post-1196","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-python"],"_links":{"self":[{"href":"http:\/\/www.tansoo.cn\/index.php?rest_route=\/wp\/v2\/posts\/1196","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.tansoo.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.tansoo.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.tansoo.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.tansoo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1196"}],"version-history":[{"count":2,"href":"http:\/\/www.tansoo.cn\/index.php?rest_route=\/wp\/v2\/posts\/1196\/revisions"}],"predecessor-version":[{"id":1198,"href":"http:\/\/www.tansoo.cn\/index.php?rest_route=\/wp\/v2\/posts\/1196\/revisions\/1198"}],"wp:attachment":[{"href":"http:\/\/www.tansoo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1196"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.tansoo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1196"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.tansoo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1196"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}