{"id":131884,"date":"2020-07-06T02:47:36","date_gmt":"2020-07-05T18:47:36","guid":{"rendered":"http:\/\/4563.org\/?p=131884"},"modified":"2020-07-06T02:47:36","modified_gmt":"2020-07-05T18:47:36","slug":"pymongo-%e9%94%99%e8%af%af%e5%a4%84%e7%90%86%ef%bc%9aindexerror-no-such-item-for-cursor-instance%e3%80%82","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=131884","title":{"rendered":"pymongo \u9519\u8bef\u5904\u7406\uff1aIndexError: no such item for Cursor instance\u3002"},"content":{"rendered":"<p>\u9519\u8bef\u4fe1\u606f <code>IndexError: no such item for Cursor instance<\/code> \uff0c\u600e\u4e48\u89e3\u51b3\u5462\uff1f<\/p>\n<h3><a href=\"https:\/\/www.studytime.xin\/article\/#\u4ea7\u751f\u539f\u56e0\" title=\"\u4ea7\u751f\u539f\u56e0\"><\/a>\u4ea7\u751f\u539f\u56e0<\/h3>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span>result = collection.find(&#123;<span>\"id\"<\/span>: <span>\"12345678\"<\/span>&#125;)<\/span><br><span><span>print<\/span> result[<span>0<\/span>][<span>'name'<\/span>]<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n<p>\u6253\u5370\u8f93\u51fa\u63d0\u793a<code>IndexError: no such item for Cursor instance<\/code>\uff0c\u5927\u610f\u4e3a\uff1a<code>Cursor\u5b9e\u4f8b\u6ca1\u6709\u5bf9\u5e94\u7684\u8282\u70b9<\/code>\uff0c\u8fd9\u6837\u7684\u95ee\u9898\u8be5\u600e\u6837\u89e3\u51b3\u5462\uff1f\u4f7f\u7528\u600e\u6837\u7684<code>if<\/code>\u5224\u5b9a\u53ef\u4ee5\u5224\u5b9a\u7ed3\u679c\u96c6\u662f\u6709\u6548\u5730\u5462\uff1f<\/p>\n<h3><a href=\"https:\/\/www.studytime.xin\/article\/#\u89e3\u51b3\u529e\u6cd5\" title=\"\u89e3\u51b3\u529e\u6cd5\"><\/a>\u89e3\u51b3\u529e\u6cd5<\/h3>\n<p><code>result.count()<\/code><\/p>\n<h3><a href=\"https:\/\/www.studytime.xin\/article\/#\u4ee3\u7801\u5b9e\u4f8b\" title=\"\u4ee3\u7801\u5b9e\u4f8b\"><\/a>\u4ee3\u7801\u5b9e\u4f8b<\/h3>\n<figure>\n<table>\n<tr>\n<td>\n<pre><span>1<\/span><br><span>2<\/span><br><span>3<\/span><br><\/pre>\n<\/td>\n<td>\n<pre><span>result = collection.find(&#123;<span>\"id\"<\/span>: <span>\"12345678\"<\/span>&#125;)<\/span><br><span><span>if<\/span> result <span>and<\/span> result.count():<\/span><br><span>    <span>print<\/span> result[<span>0<\/span>][<span>'name'<\/span>]<\/span><br><\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"<p>\u9519\u8bef\u4fe1\u606f IndexError: &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/131884"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=131884"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/131884\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=131884"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=131884"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=131884"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}