{"id":4372,"date":"2023-07-11T15:30:48","date_gmt":"2023-07-11T15:30:48","guid":{"rendered":"https:\/\/statorials.org\/cn\/pandas-%e4%bb%8e-1-%e9%87%8d%e6%96%b0%e7%b4%a2%e5%bc%95\/"},"modified":"2023-07-11T15:30:48","modified_gmt":"2023-07-11T15:30:48","slug":"pandas-%e4%bb%8e-1-%e9%87%8d%e6%96%b0%e7%b4%a2%e5%bc%95","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/pandas-%e4%bb%8e-1-%e9%87%8d%e6%96%b0%e7%b4%a2%e5%bc%95\/","title":{"rendered":"Pandas\uff1a\u5982\u4f55\u91cd\u65b0\u7d22\u5f15\u4ece 1 \u5f00\u59cb\u7684\u884c"},"content":{"rendered":"

<\/p>\n

\n

\u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u57fa\u672c\u8bed\u6cd5\u4ece 1 \u800c\u4e0d\u662f 0 \u5f00\u59cb\u91cd\u65b0\u7d22\u5f15 pandas DataFrame \u7684\u884c\uff1a<\/span><\/p>\n

 import<\/span> pandas as<\/span> pd<\/span>\nimport<\/span> numpy as<\/span> np<\/span>\n<\/span><\/span>\ndf. index<\/span> = np. arange<\/span> (1, len<\/span> (df)+1)\n<\/strong><\/pre>\n
 NumPy arange()<\/strong>\u51fd\u6570\u521b\u5efa\u4e00\u4e2a\u4ece 1 \u5f00\u59cb\u7684\u6570\u7ec4\uff0c\u4ee5 1 \u4e3a\u589e\u91cf\u589e\u52a0\uff0c\u76f4\u5230\u6574\u4e2a DataFrame \u7684\u957f\u5ea6\u52a0 1\u3002<\/span><\/p>\n
\u7136\u540e\u5c06\u8be5\u6570\u7ec4\u7528\u4f5c DataFrame \u7684\u7d22\u5f15\u3002<\/span><\/p>\n
\u4ee5\u4e0b\u793a\u4f8b\u5c55\u793a\u4e86\u5982\u4f55\u5728\u5b9e\u8df5\u4e2d\u4f7f\u7528\u6b64\u8bed\u6cd5\u3002<\/span><\/p>\n
\u793a\u4f8b\uff1a\u4ece 1 \u5f00\u59cb\u91cd\u65b0\u7d22\u5f15 Pandas DataFrame \u7684\u884c<\/strong><\/span><\/h2>\n
\u5047\u8bbe\u6211\u4eec\u6709\u4ee5\u4e0b pandas DataFrame\uff0c\u5176\u4e2d\u5305\u542b\u6709\u5173\u5404\u79cd\u7bee\u7403\u8fd0\u52a8\u5458\u7684\u4fe1\u606f\uff1a<\/span><\/p>\n
 import<\/span> pandas as<\/span> pd\n\n#createDataFrame<\/span>\ndf = pd. DataFrame<\/span> ({' team<\/span> ': ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H'],\n                   ' points<\/span> ': [18, 22, 19, 14, 14, 11, 20, 28],\n                   ' assists<\/span> ': [5, 7, 7, 9, 12, 9, 9, 4],\n                   ' rebounds<\/span> ': [11, 8, 10, 6, 6, 5, 9, 12]})\n                   \n#view DataFrame\n<\/span>print<\/span> (df)\n\n  team points assists rebounds\n0 A 18 5 11\n1 B 22 7 8\n2 C 19 7 10\n3 D 14 9 6\n4 E 14 12 6\n5 F 11 9 5\n6 G 20 9 9\n7:28 4 12<\/strong><\/pre>\n
\u8bf7\u6ce8\u610f\uff0c\u7d22\u5f15\u5f53\u524d\u8303\u56f4\u4e3a 0 \u5230 7\u3002<\/span><\/span><\/p>\n
\u8981\u5c06\u7d22\u5f15\u4e2d\u7684\u503c\u91cd\u65b0\u7d22\u5f15\u5230\u4ece1\u5f00\u59cb\u7684\u5217\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\uff1a<\/span><\/p>\n
 import<\/span> numpy as<\/span> np\n<\/span>\n#reindex values in index to start from 1\n<\/span>df. index<\/span> = np. arange<\/span> (1, len<\/span> (df)+1)\n\n#view updated DataFrame<\/span>\nprint<\/span> (df)\n\n  team points assists rebounds\n1 A 18 5 11\n2 B 22 7 8\n3 C 19 7 10\n4 D 14 9 6\n5 E 14 12 6\n6 F 11 9 5\n7 G 20 9 9\n8:28 a.m. 4:12\n<\/strong><\/pre>\n
\u8bf7\u6ce8\u610f\uff0c\u7d22\u5f15\u503c\u73b0\u5728\u4ece 1 \u5f00\u59cb\u3002<\/span><\/p>\n
\u6ce8\u610f#1<\/strong> \uff1a\u4f7f\u7528len()<\/strong>\u51fd\u6570\u67e5\u627e DataFrame \u4e2d\u7684\u884c\u6570\u7684\u4f18\u70b9\u662f\uff0c\u5728\u521b\u5efa\u65b0\u6570\u7ec4\u4e4b\u524d\u6211\u4eec\u4e0d\u9700\u8981\u77e5\u9053 DataFrame \u4e2d\u6709\u591a\u5c11\u884c\u3002\u6307\u6570\u503c\u3002<\/span><\/p>\n
\u6ce8\u610f#2<\/strong> \uff1a\u60a8\u53ef\u4ee5\u5728\u6b64\u5904<\/a>\u627e\u5230 NumPy arange()<\/strong>\u51fd\u6570\u7684\u5b8c\u6574\u6587\u6863\u3002<\/span><\/p>\n
\u5176\u4ed6\u8d44\u6e90<\/strong><\/span><\/h2>\n
\u4ee5\u4e0b\u6559\u7a0b\u89e3\u91ca\u4e86\u5982\u4f55\u5728 pandas \u4e2d\u6267\u884c\u5176\u4ed6\u5e38\u89c1\u4efb\u52a1\uff1a<\/span><\/p>\n
\u5982\u4f55\u5220\u9664 Pandas \u4e2d\u7684\u7d22\u5f15\u540d\u79f0<\/a>
\u5982\u4f55\u5c55\u5e73 Pandas \u4e2d\u7684\u591a\u91cd\u7d22\u5f15<\/a>
\u5982\u4f55\u4ece Pandas \u7684\u7d22\u5f15\u4e2d\u83b7\u53d6\u552f\u4e00\u503c<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
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