{"id":152,"date":"2021-07-01T15:58:25","date_gmt":"2021-07-01T07:58:25","guid":{"rendered":"https:\/\/www.fengjijiao.cn\/?p=152"},"modified":"2021-07-01T16:04:04","modified_gmt":"2021-07-01T08:04:04","slug":"python%e4%b8%ad-2%e4%bd%9c%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.fengjijiao.cn\/?p=152","title":{"rendered":"python numpy\u4e2d[...,2]\u4f5c\u7528"},"content":{"rendered":"\n

\u5728\u56fe\u50cf\u5904\u7406\u4e2d\u7ecf\u5e38\u770b\u5230nparr[…,2]\u7684\u64cd\u4f5c\uff0c\u4e0d\u592a\u7406\u89e3\u8be5\u529f\u80fd\uff0c\u901a\u8fc7\u4e0b\u5217\u6f14\u793a\u6765\u7406\u89e3nparr[…,2]\u7684\u7528\u9014\uff01<\/p>\n\n\n\n

>>> arr=[[[1,2,3,4],[4,5,6,7],[5,6,7,8]],[[1,2,3,4],[4,5,6,7],[5,6,7,8]],[[1,2,3,4],[4,5,6,7],[5,6,7,8]]]\n>>> import numpy as np\n>>> nparr=np.array(arr)\n>>> nparr[...,0:1]\narray([[[1],\n        [4],\n        [5]],\n\n       [[1],\n        [4],\n        [5]],\n\n       [[1],\n        [4],\n        [5]]])\n>>> nparr[...,0]\narray([[1, 4, 5],\n       [1, 4, 5],\n       [1, 4, 5]])\n>>> nparr[...,2]\narray([[3, 6, 7],\n       [3, 6, 7],\n       [3, 6, 7]])\n>>> nparr[...,0:2]\narray([[[1, 2],\n        [4, 5],\n        [5, 6]],\n\n       [[1, 2],\n        [4, 5],\n        [5, 6]],\n\n       [[1, 2],\n        [4, 5],\n        [5, 6]]])\n<\/code><\/pre>\n\n\n\n
\u901a\u8fc7\u4ee5\u4e0aIDLE\u4ee3\u7801\u8fd0\u884c\u7ed3\u679c\u53ef\u4ee5\u770b\u51fa\uff0c<\/p>\n\n\n\n
nparr[…,0]\u83b7\u53d6\u5230\u7684\u662f\u6700\u4f4e\u7ef4\u5ea6\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\u7ec4\u6210\u7684\u6570\u7ec4(\u6700\u4f4e\u7ef4\u5ea6\uff0c\u539f\u5148\u4e3a\u6570\u7ec4\uff0c\u540e\u6765\u4e3a\u5355\u4e2a\u5143\u7d20)\uff0c\u83b7\u53d6\u5230\u7684\u7ef4\u5ea6\u4e3a(3-1)[\u539f\u59cb\u6570\u7ec4\u7ef4\u5ea6\uff1a3\uff0c\u8981\u51cf\u53bb\u539f\u5148\u7684\u6700\u4f4e\u7ef4\u5ea6\uff0c\u76f8\u5f53\u4e8e\u539f\u6570\u7ec4\u964d\u4f4e\u4e00\u4e2a\u7ef4\u5ea6]\u3002<\/p>\n\n\n\n
nparr[…,0:1]\u83b7\u53d6\u5230\u7684\u662f\u6700\u4f4e\u7ef4\u5ea6\u7684\u5143\u7d20\u5e8f\u53f7\u8303\u56f4\u662f[0,1)\u7684\u5143\u7d20\u5145\u5f53\u6700\u4f4e\u7ef4\u5ea6\u7684\u6570\u7ec4(\u6700\u4f4e\u7ef4\u5ea6\uff0c\u539f\u5148\u662f\u6570\u7ec4\uff0c\u540e\u6765\u8fd8\u662f\u6570\u7ec4)\uff0c\u7ef4\u5ea6\u6570\u4e0d\u53d8\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5728\u56fe\u50cf\u5904\u7406\u4e2d\u7ecf\u5e38\u770b\u5230nparr[…,2]\u7684\u64cd\u4f5c\uff0c\u4e0d\u592a\u7406\u89e3\u8be5\u529f\u80fd\uff0c\u901a\u8fc7\u4e0b\u5217\u6f14\u793a\u6765\u7406\u89e3nparr[&# […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3],"tags":[4,5],"_links":{"self":[{"href":"https:\/\/www.fengjijiao.cn\/index.php?rest_route=\/wp\/v2\/posts\/152"}],"collection":[{"href":"https:\/\/www.fengjijiao.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fengjijiao.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fengjijiao.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fengjijiao.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=152"}],"version-history":[{"count":20,"href":"https:\/\/www.fengjijiao.cn\/index.php?rest_route=\/wp\/v2\/posts\/152\/revisions"}],"predecessor-version":[{"id":172,"href":"https:\/\/www.fengjijiao.cn\/index.php?rest_route=\/wp\/v2\/posts\/152\/revisions\/172"}],"wp:attachment":[{"href":"https:\/\/www.fengjijiao.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=152"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fengjijiao.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=152"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fengjijiao.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=152"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}