{"id":1691,"date":"2020-06-22T16:47:02","date_gmt":"2020-06-22T08:47:02","guid":{"rendered":"http:\/\/39.97.231.10\/?p=1691"},"modified":"2020-06-22T16:47:02","modified_gmt":"2020-06-22T08:47:02","slug":"python%e5%ad%97%e5%85%b8%e7%bb%93%e6%9e%84%e7%9a%84get%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"http:\/\/www.weijing.co\/?p=1691","title":{"rendered":"Python \u5b57\u5178\u7ed3\u6784\u7684 get() \u65b9\u6cd5"},"content":{"rendered":"<div>\nPython \u5b57\u5178\u5b9a\u4e49\u4e86\u4e00\u4e2a get() \u65b9\u6cd5\uff0c\u5b83\u6709\u4e24\u4e2a\u5165\u53c2\uff1a\u8981\u53d6\u5f97\u5176\u503c\u7684\u952e\u540d\uff0c\u4ee5\u53ca\u5982\u679c\u8be5\u952e\u4e0d\u5b58\u5728\u65f6\uff0c\u8fd4\u56de\u7684\u9ed8\u8ba4\u503c \u3002<br \/>\n\u56e0\u4e3a\u5982\u679c\u4f7f\u7528\u6570\u7ec4\u8bed\u6cd5 dict[key]\uff0c\u8bbf\u95ee\u5b57\u5178\u4e2d\u4e0d\u5b58\u5728\u7684\u952e\uff0c \u4f1a\u5bfc\u81f4 KeyError \u9519\u8bef\uff0c\u6240\u4ee5\u4f7f\u7528\u8be5\u8bed\u6cd5\uff0c\u5fc5\u987b\u5148\u7528 in \u8bed\u6cd5\u505a\u68c0\u67e5\u3002<\/p>\n<div>\n<pre>dict = {\\'evaporation\\': {\\'\u91ca\u4e49\\': \\'\u84b8\u53d1\\', \\'\u8bcd\u6027\\': \\'n\\'},\n        \\'carpenter\\': {\\'\u91ca\u4e49\\': \\'\u6728\u5320\\', \\'\u8bcd\u6027\\': \\'n\\'}}\nprint(str(dict[\\'carpenters\\']))\n<\/pre>\n<\/div>\n<p>\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<blockquote><p>KeyError: \\&#8217;carpenters\\&#8217;<\/p><\/blockquote>\n<p>\u53ef\u4ee5\u4f7f\u7528 get() \u65b9\u6cd5\uff0c\u8fd9\u6837\u5373\u4f7f\u8be5\u952e\u4e0d\u5b58\u5728\u5b57\u5178\u4e2d\uff0c\u4e5f\u53ef\u4ee5\u4e3a\u5176\u6307\u5b9a\u8fd4\u56de\u503c\u5566\uff1a<\/p>\n<div>\n<pre>print(str(dict.get(\\'carpenters\\',\\'\u672c\u8bcd\u5178\u672a\u6536\u5165\\')))\n<\/pre>\n<\/div>\n<p>\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<blockquote><p>\u672c\u8bcd\u5178\u672a\u6536\u5165<\/p><\/blockquote>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Python \u5b57\u5178\u5b9a\u4e49\u4e86\u4e00\u4e2a get() \u65b9\u6cd5\uff0c\u5b83\u6709\u4e24\u4e2a\u5165\u53c2\uff1a\u8981\u53d6\u5f97\u5176\u503c\u7684\u952e\u540d\uff0c\u4ee5\u53ca\u5982\u679c\u8be5\u952e\u4e0d\u5b58\u5728\u65f6\uff0c\u8fd4\u56de\u7684\u9ed8 &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"http:\/\/www.weijing.co\/?p=1691\"> <span class=\"screen-reader-text\">Python \u5b57\u5178\u7ed3\u6784\u7684 get() \u65b9\u6cd5<\/span> \u67e5\u770b\u5168\u6587 &raquo;<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":""},"categories":[106,126],"tags":[],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"mailpoet_newsletter_max":false,"woocommerce_thumbnail":false,"woocommerce_single":false,"woocommerce_gallery_thumbnail":false,"shop_catalog":false,"shop_single":false,"shop_thumbnail":false},"uagb_author_info":{"display_name":"weijing","author_link":"http:\/\/www.weijing.co\/?author=4"},"uagb_comment_info":0,"uagb_excerpt":"Python \u5b57\u5178\u5b9a\u4e49\u4e86\u4e00\u4e2a get() \u65b9\u6cd5\uff0c\u5b83\u6709\u4e24\u4e2a\u5165\u53c2\uff1a\u8981\u53d6\u5f97\u5176\u503c\u7684\u952e\u540d\uff0c\u4ee5\u53ca\u5982\u679c\u8be5\u952e\u4e0d\u5b58\u5728\u65f6\uff0c\u8fd4\u56de\u7684\u9ed8&hellip;","_links":{"self":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/1691"}],"collection":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1691"}],"version-history":[{"count":0,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/1691\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1691"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1691"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1691"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}