{"id":976,"date":"2023-07-28T03:15:43","date_gmt":"2023-07-28T03:15:43","guid":{"rendered":"https:\/\/statorials.org\/cn\/pandas-%e5%90%88%e5%b9%b6%e5%a4%9a%e5%88%97\/"},"modified":"2023-07-28T03:15:43","modified_gmt":"2023-07-28T03:15:43","slug":"pandas-%e5%90%88%e5%b9%b6%e5%a4%9a%e5%88%97","status":"publish","type":"post","link":"https:\/\/statorials.org\/cn\/pandas-%e5%90%88%e5%b9%b6%e5%a4%9a%e5%88%97\/","title":{"rendered":"\u5982\u4f55\u8de8\u591a\u5217\u5408\u5e76 pandas dataframe"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">\u901a\u5e38\uff0c\u60a8\u53ef\u80fd\u5e0c\u671b\u8de8\u591a\u4e2a\u5217\u5408\u5e76\u4e24\u4e2a pandas DataFrame\u3002\u5e78\u8fd0\u7684\u662f\uff0c\u4f7f\u7528 pandas <a href=\"https:\/\/pandas.pydata.org\/docs\/reference\/api\/pandas.merge.html\" target=\"_blank\" rel=\"noopener noreferrer\">merge()<\/a>\u51fd\u6570\u53ef\u4ee5\u8f7b\u677e\u505a\u5230\u8fd9\u4e00\u70b9\uff0c\u8be5\u51fd\u6570\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>p.d. <span style=\"color: #3366ff;\">merge<\/span> (df1, df2, left_on=['col1','col2'], right_on = ['col1','col2'])<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u672c\u6559\u7a0b\u89e3\u91ca\u4e86\u5982\u4f55\u5728\u5b9e\u8df5\u4e2d\u4f7f\u7528\u6b64\u529f\u80fd\u3002<\/span><\/p>\n<h3><strong>\u793a\u4f8b 1\uff1a<span style=\"color: #000000;\">\u5408\u5e76<\/span>\u5177\u6709\u4e0d\u540c\u540d\u79f0\u7684\u591a\u4e2a\u5217<\/strong><\/h3>\n<p><span style=\"color: #000000;\">\u5047\u8bbe\u6211\u4eec\u6709\u4ee5\u4e0b\u4e24\u4e2a panda DataFrame\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #107d3f;\">import<\/span> pandas <span style=\"color: #107d3f;\">as<\/span> pd\n\n<span style=\"color: #008080;\">#create and view first DataFrame<\/span>\ndf1 = pd.DataFrame({'a1': [0, 0, 1, 1, 2],\n                   'b': [0, 0, 1, 1, 1],\n                   'c': [11, 8, 10, 6, 6]})\n\n<span style=\"color: #3366ff;\">print<\/span> (df1)\n\n   a1 bc\n0 0 0 11\n1 0 0 8\n2 1 1 10\n3 1 1 6\n4 2 1 6\n\n<span style=\"color: #008080;\">#create and view second DataFrame<\/span> \ndf2 = pd.DataFrame({'a2': [0, 1, 1, 1, 3],\n                   'b': [0, 0, 0, 1, 1],\n                   'd': [22, 24, 25, 33, 37]})\n\n<span style=\"color: #3366ff;\">print<\/span> (df2)\n\n   a2 comic\n0 0 0 22\n1 1 0 24\n2 1 0 25\n3 1 1 33\n4 3 1 37\n<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u4ee5\u4e0b\u4ee3\u7801\u663e\u793a\u4e86\u5982\u4f55\u4f7f\u7528\u4e24\u4e2a DataFrame \u4e2d\u7684\u591a\u4e2a\u5217\u6267\u884c\u5de6\u8fde\u63a5\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>p.d. <span style=\"color: #3366ff;\">merge<\/span> (df1, df2, how=' <span style=\"color: #008000;\">left<\/span> ', left_on=[' <span style=\"color: #008000;\">a1<\/span> ', ' <span style=\"color: #008000;\">b<\/span> '], right_on = [' <span style=\"color: #008000;\">a2<\/span> ', ' <span style=\"color: #008000;\">b<\/span> '])\n\n\n        a1 b c a2 d\n0 0 0 11 0.0 22.0\n1 0 0 8 0.0 22.0\n2 1 1 10 1.0 33.0\n3 1 1 6 1.0 33.0\n4 2 1 6 NaN NaN\n<\/strong><\/pre>\n<h3><strong>\u793a\u4f8b 2\uff1a<span style=\"color: #000000;\">\u5408\u5e76<\/span>\u591a\u4e2a\u540c\u540d\u5217<\/strong><\/h3>\n<p><span style=\"color: #000000;\">\u5047\u8bbe\u6211\u4eec\u6709\u4ee5\u4e0b\u4e24\u4e2a\u5177\u6709\u76f8\u540c\u5217\u540d\u7684 pandas DataFrame\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #107d3f;\">import<\/span> pandas <span style=\"color: #107d3f;\">as<\/span> pd\n\n<span style=\"color: #008080;\">#createDataFrames<\/span>\ndf1 = pd.DataFrame({'a': [0, 0, 1, 1, 2],\n                   'b': [0, 0, 1, 1, 1],\n                   'c': [11, 8, 10, 6, 6]})\n\ndf2 = pd.DataFrame({'a': [0, 1, 1, 1, 3],\n                   'b': [0, 0, 0, 1, 1],\n                   'd': [22, 24, 25, 33, 37]})\n<\/strong><\/pre>\n<p><span style=\"color: #000000;\">\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u4ee5\u7b80\u5316\u4f7f\u7528<strong>on = [&#8216;a&#8217;, &#8216;b&#8217;]<\/strong>\u56e0\u4e3a\u4e24\u4e2a DataFrame \u4e2d\u7684\u5217\u540d\u79f0\u76f8\u540c\uff1a<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>p.d. <span style=\"color: #3366ff;\">merge<\/span> (df1, df2, how=' <span style=\"color: #008000;\">left<\/span> ', on=[' <span style=\"color: #008000;\">a<\/span> ', ' <span style=\"color: #008000;\">b<\/span> '])\n\n\ta b c d\n0 0 0 11 22.0\n1 0 0 8 22.0\n2 1 1 10 33.0\n3 1 1 6 33.0\n4 2 1 6 NaN\n<\/strong><\/pre>\n<h3><span style=\"color: #000000;\"><strong>\u5176\u4ed6\u8d44\u6e90<\/strong><\/span><\/h3>\n<p>\u5982\u4f55\u5408\u5e76\u7d22\u5f15\u4e0a\u7684\u4e24\u4e2a Pandas DataFrame<br \/> <a href=\"https:\/\/statorials.org\/cn\/\u5806\u6808-pandas-\u6570\u636e\u6846\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u5982\u4f55\u5806\u53e0\u591a\u4e2a Pandas DataFrame<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u901a\u5e38\uff0c\u60a8\u53ef\u80fd\u5e0c\u671b\u8de8\u591a\u4e2a\u5217\u5408\u5e76\u4e24\u4e2a pandas DataFrame\u3002\u5e78\u8fd0\u7684\u662f\uff0c\u4f7f\u7528 pandas merge( [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-976","post","type-post","status-publish","format-standard","hentry","category-11"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - 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