{"id":173084,"date":"2023-07-30T16:26:48","date_gmt":"2023-07-30T08:26:48","guid":{"rendered":"http:\/\/www.idc.net\/help\/173084\/"},"modified":"2023-07-30T16:26:48","modified_gmt":"2023-07-30T08:26:48","slug":"%e5%90%8e%e6%b5%aa%e4%ba%91python%e6%95%99%e7%a8%8b%ef%bc%9apython%e4%b8%adslice%e7%9a%84%e7%bc%ba%e7%9c%81%e5%80%bc%e6%98%af%e4%bb%80%e4%b9%88","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/173084\/","title":{"rendered":"\u540e\u6d6a\u4e91Python\u6559\u7a0b\uff1apython\u4e2dslice\u7684\u7f3a\u7701\u503c\u662f\u4ec0\u4e48"},"content":{"rendered":"

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\u6211\u4eec\u5728\u62ff\u5230\u4e00\u4e2a\u8f6f\u4ef6\u7684\u65f6\u5019\uff0c\u6253\u5f00\u5b83\u7684\u5c5e\u6027\u680f\u53ef\u4ee5\u770b\u5230\u5f88\u591a\u9ed8\u8ba4\u7684\u53c2\u6570\u3002\u5728\u8ba1\u7b97\u673a\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u628a\u8f6f\u4ef6\u7684\u4e00\u4e9b\u9ed8\u8ba4\u503c\u7406\u89e3\u4e3a\u7f3a\u7701\u3002\u540c\u6837\u7684\uff0c\u5728slice\u53c2\u6570\u4e2dstart\u548cstop<\/span>\u4e5f\u90fd\u6709\u5404\u81ea\u7684\u9ed8\u8ba4\u503c\u3002\u8fd9\u91ccslice\u53c2\u6570\u662f\u53d6\u533a\u95f4\u7684\uff0c\u4e0b\u9762\u5c31\u5177\u4f53\u7684start\u548cstop<\/span><\/span>\u5206\u522b\u8fdb\u884c\u4ee3\u7801\u5206\u6790\u3002<\/span><\/p>\n

1.\u53d6\u533a\u95f4<\/span><\/strong><\/p>\n

start\u548cstop\u90fd\u662f\u53ef\u4ee5\u7f3a\u7701\u7684\uff0c\u5728\u7f3a\u7701\u7684\u60c5\u51b5\u4e0b\uff0cPython\u7684\u884c\u4e3a\u662f\u5c3d\u53ef\u80fd\u53d6\u533a\u95f4\uff0c\u5177\u4f53\u6765\u8bf4\uff1a<\/span><\/span><\/p>\n

\u6309\u7167\u6269\u5145\u7d22\u5f15\u8303\u56f4\u7684\u89c2\u70b9\uff0c<\/span>start\u7684\u7f3a\u7701\u503c\u662f\u65e0\u7a77\u5c0f()\uff0cstop\u7684\u7f3a\u7701\u503c\u662f\u65e0\u7a77\u5927()\u3002<\/span><\/p>\n

 >>> a\n [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]\n >>> a[:5]\n [0, 1, 2, 3, 4]\n >>> a[5:]\n [5, 6, 7, 8, 9]\n >>> a[100:]\n []<\/pre>\n
2.step\u4e3a\u6b63\u6570<\/span><\/span><\/strong><\/p>\n
\u5f53<\/span>step\u4e3a\u6b63\u6570\u65f6\uff0c\u5207\u7247\u884c\u4e3a\u5f88\u5bb9\u6613\u7406\u89e3\uff0cstart\u548cstop\u7684\u622a\u65ad\u548c\u7f3a\u7701\u89c4\u5219\u4e5f\u4e0e\u7b80\u5355\u5207\u7247\u5b8c\u5168\u4e00\u81f4\uff1a<\/span><\/p>\n
 >>> a\n [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]\n >>> a[0:6:2]\n [0, 2, 4]\n >>> a[::2]\n [0, 2, 4, 6, 8]\n >>> a[:-2:2]\n [0, 2, 4, 6]\n >>> a[4::2]\n [4, 6, 8]<\/pre>\n
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3.step\u4e3a\u8d1f\u6570<\/span><\/span><\/strong><\/p>\n
\u5f53<\/span>step\u4e3a\u8d1f\u6570\u65f6\uff0c\u5207\u7247\u5c06\u5176\u89e3\u91ca\u4e3a\u4ecestart\u51fa\u53d1\u4ee5\u6b65\u957f|step|\u9006\u5e8f\u7d22\u5f15\u5e8f\u5217\uff0c\u6b64\u65f6\uff0cstart\u548cstop\u7684\u622a\u65ad\u4f9d\u7136\u9075\u5faa\u524d\u8ff0\u89c4\u5219\uff0c\u4f46\u7f3a\u7701\u53d1\u751f\u4e00\u70b9\u53d8\u5316\uff0c\u56e0\u4e3a\u6211\u4eec\u8bf4\u8fc7\uff0c\u5728\u7f3a\u7701\u7684\u60c5\u51b5\u4e0b\uff0cPython\u7684\u884c\u4e3a\u662f\u5c3d\u53ef\u80fd\u53d6\u533a\u95f4\uff0c\u6b64\u65f6\u8bbf\u95ee\u662f\u9006\u5e8f\u7684\uff0cstart\u5e94\u5c3d\u91cf\u53d6\u5927\uff0cstop\u5e94\u5c3d\u91cf\u53d6\u5c0f\uff0c\u624d\u80fd\u4fdd\u8bc1\u533a\u95f4\uff0c\u56e0\u6b64\uff1a<\/span><\/span><\/span><\/p>\n
\u6309\u7167\u6269\u5145\u7d22\u5f15\u8303\u56f4\u7684\u89c2\u70b9\uff0c<\/span>start\u7684\u7f3a\u7701\u503c\u662f\u65e0\u7a77\u5927()\uff0cstop\u7684\u7f3a\u7701\u503c\u662f\u65e0\u7a77\u5c0f()<\/span><\/span><\/p>\n
 >>> a\n [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]\n >>> a[5::-1]\n [5, 4, 3, 2, 1, 0]\n >>> a[:4:-2]\n [9, 7, 5]\n >>> a[::-1]\n [9, 8, 7, 6, 5, 4, 3, 2, 1, 0]<\/pre>\n
\u8bb0\u4f4f\u51e0\u70b9\uff1a<\/span><\/span><\/p>\n
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    \u5207\u7247\u7ed3\u679c\u662f\u901a\u8fc7<\/span> start\u3001stop \u5904\u7406\u540e\u7684\u503c\u51b3\u5b9a\u7684\uff0c\u4ece start \u5f00\u59cb\u6b62\u4e8e stop \u4e0d\u5305\u62ec stop\uff0c[start, stop)<\/span><\/span><\/span><\/p>\n<\/li>\n
  • \n
    \u5982\u679c<\/span> step > 0\uff0c\u4ece start \u4f4d\u7f6e\u5f80\u540e\uff0c\u6bcf step \u53d6\u4e00\u4e2a\u503c\uff0c\u5982\u679c start >= stop\uff0c\u7ed3\u679c\u4e3a\u7a7a<\/span><\/p>\n<\/li>\n
  • \n
    \u5982\u679c<\/span> step < 0\uff0c\u4ece start \u4f4d\u7f6e\u5f80\u524d\uff0c\u6bcf step \u53d6\u4e00\u4e2a\u503c\uff0c\u5982\u679c start <= stop\uff0c\u7ed3\u679c\u4e3a\u7a7a<\/span><\/p>\n<\/li>\n
  • \n
    start \u6216 stop \u4e3a\u8d1f\u6570\u65f6\uff0c\u5982\u679c\u7edd\u5bf9\u503c\u5728 length \u5185\uff0c\u90a3\u4e48\u548c length + start \u6216 stop \u7b49\u4ef7<\/span><\/p>\n<\/li>\n
  • \n
    start \u6216 stop \u4e3a\u8d1f\u6570\u65f6\uff0c\u5982\u679c\u7edd\u5bf9\u503c\u8d85\u8fc7 length \uff0c\u90a3\u4e48\u5c31\u8981\u6839\u636e\u5207\u7247\u65b9\u5411\u5c06 start \u6216 stop \u8f6c\u6362\u4e3a\u8fb9\u754c\u503c<\/span><\/p>\n<\/li>\n<\/ul>\n
    \u4ee5\u4e0a\u5c31\u662fpython\u4e2dslice\u53c2\u6570start\u548cstop<\/span>\u7f3a\u7701\u503c\u7684\u5206\u522b\u63a2\u8ba8\uff0c\u8981\u70b9\u662fslice\u53c2\u6570<\/span>\u662f\u53d6\u533a\u95f4\u7684\uff0c\u5728\u8fd9\u4e2a\u57fa\u7840\u4e0a\u6211\u4eec\u518d\u8ba8\u8bba\u4e0d\u540c\u6761\u4ef6\u4e0b\u53c2\u6570\u7684\u7f3a\u7701\u7ed3\u679c\u3002<\/span><\/p>\n
    \uff08\u63a8\u8350\u64cd\u4f5c\u7cfb\u7edf\uff1awindows7\u7cfb\u7edf\u3001Python 3.9.1\uff0cDELL G3\u7535\u8111\u3002\uff09<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"
    \u6211\u4eec\u5728\u62ff\u5230\u4e00\u4e2a\u8f6f\u4ef6\u7684\u65f6\u5019\uff0c\u6253\u5f00\u5b83\u7684\u5c5e\u6027\u680f\u53ef\u4ee5\u770b\u5230\u5f88\u591a\u9ed8\u8ba4\u7684\u53c2\u6570\u3002\u5728\u8ba1\u7b97\u673a\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u628a\u8f6f\u4ef6\u7684\u4e00\u4e9b\u9ed8\u8ba4\u503c\u7406\u89e3\u4e3a\u7f3a […]<\/p>\n","protected":false},"author":1,"featured_media":173085,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[182397],"tags":[],"class_list":["post-173084","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/173084","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=173084"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/173084\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media\/173085"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=173084"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=173084"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=173084"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}