{"id":485,"date":"2023-05-12T05:05:51","date_gmt":"2023-03-03T01:06:39","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/pandas-dataframe-%e7%9a%84-apply-%e7%a4%ba%e4%be%8b\/"},"modified":"2025-08-02T13:04:13","modified_gmt":"2025-08-02T05:04:13","slug":"pandas-dataframe-%e7%9a%84-apply-%e7%a4%ba%e4%be%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/pandas-dataframe-%e7%9a%84-apply-%e7%a4%ba%e4%be%8b\/","title":{"rendered":"\u638c\u63e1Pandas DataFrame apply()\u65b9\u6cd5\uff1a10\u4e2a\u5b9e\u7528\u793a\u4f8b\u8be6\u89e3"},"content":{"rendered":"<p>\u8fd9\u662f\u6587\u7ae0\u300aPandas DataFrame \u7684 apply() \u793a\u4f8b\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51711\u90e8\u5206\uff09\u3002<\/p>\n<p>Pandas DataFrame\u7684apply()\u51fd\u6570\u7528\u4e8e\u6cbfDataFrame\u7684\u8f74\u5e94\u7528\u51fd\u6570\u3002\u51fd\u6570\u7684\u8bed\u6cd5\u662f\uff1a<\/p>\n<pre class=\"post-pre\"><code>def apply(\r\n    self,\r\n    func,\r\n    axis=0,\r\n    broadcast=None,\r\n    raw=False,\r\n    reduce=None,\r\n    result_type=None,\r\n    args=(),\r\n    **kwds\r\n)\r\n<\/code><\/pre>\n<p>\u91cd\u8981\u7684\u53c2\u6570\u6709\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>func\uff1a\u8981\u5e94\u7528\u4e8eDataFrame\u7684\u6bcf\u4e00\u884c\u6216\u6bcf\u4e00\u5217\u7684\u51fd\u6570\u3002<\/li>\n<li>axis\uff1a\u5e94\u7528\u51fd\u6570\u7684\u8f74\u3002\u53ef\u80fd\u7684\u503c\u4e3a{0\u6216&#8217;index&#8217;\uff0c1\u6216&#8217;columns&#8217;}\uff0c\u9ed8\u8ba4\u4e3a0\u3002<\/li>\n<li>args\uff1a\u4f20\u9012\u7ed9\u51fd\u6570\u7684\u4f4d\u7f6e\u53c2\u6570\u3002\u5f53\u6211\u4eec\u9700\u8981\u5411\u51fd\u6570\u4f20\u9012\u989d\u5916\u53c2\u6570\u65f6\uff0c\u8fd9\u5f88\u6709\u7528\u3002<\/li>\n<li>kwargs\uff1a\u4f20\u9012\u7ed9\u51fd\u6570\u7684\u989d\u5916\u5173\u952e\u5b57\u53c2\u6570\u3002\u5f53\u6211\u4eec\u9700\u8981\u5411\u51fd\u6570\u4f20\u9012\u989d\u5916\u5173\u952e\u5b57\u53c2\u6570\u65f6\uff0c\u8fd9\u5f88\u6709\u7528\u3002<\/li>\n<\/ul>\n<h2>Pandas DataFrame apply() \u793a\u4f8b<\/h2>\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u770b\u5728DataFrame\u5bf9\u8c61\u4e0a\u4f7f\u7528apply()\u51fd\u6570\u7684\u4e00\u4e9b\u4f8b\u5b50\u3002<\/p>\n<h3>\u5c06\u51fd\u6570\u5e94\u7528\u4e8eDataFrame\u5143\u7d20<\/h3>\n<pre class=\"post-pre\"><code>import pandas as pd\r\n\r\ndf = pd.DataFrame({'A': [1, 2], 'B': [10, 20]})\r\n\r\n\r\ndef square(x):\r\n    return x * x\r\n\r\n\r\ndf1 = df.apply(square)\r\n\r\nprint(df)\r\nprint(df1)\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<pre class=\"post-pre\"><code>   A   B\r\n0  1  10\r\n1  2  20\r\n\r\n   A    B\r\n0  1  100\r\n1  4  400\r\n<\/code><\/pre>\n<p>\u8c03\u7528apply()\u51fd\u6570\u7684DataFrame\u4fdd\u6301\u4e0d\u53d8\u3002apply()\u51fd\u6570\u5728\u5c06\u51fd\u6570\u5e94\u7528\u4e8e\u5176\u5143\u7d20\u540e\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684DataFrame\u5bf9\u8c61\u3002<\/p>\n<h3>\u4f7f\u7528lambda\u51fd\u6570\u8fdb\u884capply\u64cd\u4f5c<\/h3>\n<p>\u5982\u679c\u60a8\u770b\u4e00\u4e0b\u4e0a\u9762\u7684\u793a\u4f8b\uff0c\u6211\u4eec\u7684square()\u51fd\u6570\u975e\u5e38\u7b80\u5355\u3002\u6211\u4eec\u53ef\u4ee5\u5c06\u5176\u8f7b\u677e\u8f6c\u6362\u4e3alambda\u51fd\u6570\u3002\u6211\u4eec\u53ef\u4ee5\u5728\u8c03\u7528apply()\u51fd\u6570\u65f6\u521b\u5efa\u4e00\u4e2alambda\u51fd\u6570\u3002<\/p>\n<pre class=\"post-pre\"><code>df1 = df.apply(lambda x: x * x)\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c\u5c06\u4e0e\u4e0a\u4e00\u4e2a\u793a\u4f8b\u76f8\u540c\u3002<\/p>\n<h3>\u6cbf\u7740\u8f74\u5e94\u7528\u51fd\u6570<\/h3>\n<p>\u6211\u4eec\u53ef\u4ee5\u6cbf\u7740\u8f74\u5e94\u7528\u4e00\u4e2a\u51fd\u6570\u3002\u4f46\u662f\uff0c\u5728\u6700\u540e\u4e00\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u5e76\u6ca1\u6709\u4f7f\u7528\u8f74\u3002\u8be5\u51fd\u6570\u88ab\u5e94\u7528\u4e8eDataFrame\u7684\u6240\u6709\u5143\u7d20\u3002\u5f53\u6211\u4eec\u5bf9DataFrame\u7684\u884c\u6216\u5217\u8c03\u7528\u805a\u5408\u51fd\u6570\u65f6\uff0c\u8f74\u7684\u4f7f\u7528\u53d8\u5f97\u660e\u786e\u8d77\u6765\u3002\u6bd4\u5982\u8bf4\uff0c\u6211\u4eec\u60f3\u8981\u83b7\u5f97\u6cbf\u7740\u5217\u6216\u7d22\u5f15\u7684\u5143\u7d20\u7684\u548c\u3002\u6839\u636e\u8f74\u53c2\u6570\u7684\u503c\uff0c\u8f93\u51fa\u5c06\u4f1a\u6709\u6240\u4e0d\u540c\u3002<\/p>\n<pre class=\"post-pre\"><code>import pandas as pd\r\nimport numpy as np\r\n\r\ndf = pd.DataFrame({'A': [1, 2], 'B': [10, 20]})\r\n\r\ndf1 = df.apply(np.sum, axis=0)\r\nprint(df1)\r\n\r\ndf1 = df.apply(np.sum, axis=1)\r\nprint(df1)\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code>A     3\r\nB    30\r\ndtype: int64\r\n\r\n0    11\r\n1    22\r\ndtype: int64\r\n<\/code><\/pre>\n<p>\u5728\u7b2c\u4e00\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u8ba1\u7b97\u7684\u662f\u5217\u4e0a\u5143\u7d20\u7684\u603b\u548c\u3002\u800c\u5728\u7b2c\u4e8c\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u8ba1\u7b97\u7684\u662f\u884c\u4e0a\u5143\u7d20\u7684\u603b\u548c\u3002<\/p>\n<h3>\u5e26\u6709\u53c2\u6570\u7684DataFrame apply()<\/h3>\n<p>\u5047\u8bbe\u6211\u4eec\u60f3\u8981\u5e94\u7528\u4e00\u4e2a\u53ef\u4ee5\u63a5\u53d7\u591a\u4e2a\u53c2\u6570\u7684\u51fd\u6570\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528&#8217;args&#8217;\u53c2\u6570\u6765\u4f20\u9012\u989d\u5916\u7684\u53c2\u6570\u3002<\/p>\n<pre class=\"post-pre\"><code>import pandas as pd\r\n\r\n\r\ndef sum(x, y, z):\r\n    return x + y + z\r\n\r\n\r\ndf = pd.DataFrame({'A': [1, 2], 'B': [10, 20]})\r\n\r\ndf1 = df.apply(sum, args=(1, 2))\r\nprint(df1)\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code>   A   B\r\n0  4  13\r\n1  5  23\r\n<\/code><\/pre>\n<h3>\u5e26\u6709\u4f4d\u7f6e\u53c2\u6570\u548c\u5173\u952e\u5b57\u53c2\u6570\u7684DataFrame apply()\u51fd\u6570<\/h3>\n<p>\u8ba9\u6211\u4eec\u770b\u4e00\u4e2a\u4f8b\u5b50\uff0c\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u5c06\u540c\u65f6\u4f7f\u7528&#8217;args&#8217;\u548c&#8217;kwargs&#8217;\u53c2\u6570\u5c06\u4f4d\u7f6e\u53c2\u6570\u548c\u5173\u952e\u5b57\u53c2\u6570\u4f20\u9012\u7ed9\u51fd\u6570\u3002<\/p>\n<pre class=\"post-pre\"><code>import pandas as pd\r\n\r\n\r\ndef sum(x, y, z, m):\r\n    return (x + y + z) * m\r\n\r\n\r\ndf = pd.DataFrame({'A': [1, 2], 'B': [10, 20]})\r\n\r\ndf1 = df.apply(sum, args=(1, 2), m=10)\r\nprint(df1)\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n<pre class=\"post-pre\"><code>    A    B\r\n0  40  130\r\n1  50  230\r\n<\/code><\/pre>\n<h2>DataFrame\u7684applymap()\u51fd\u6570<\/h2>\n<p>\u5982\u679c\u60a8\u60f3\u5bf9\u6bcf\u4e2a\u5143\u7d20\u9010\u4e2a\u5e94\u7528\u51fd\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528applymap()\u51fd\u6570\u3002\u8be5\u51fd\u6570\u4e0d\u9700\u8981\u989d\u5916\u7684\u53c2\u6570\u3002\u8be5\u51fd\u6570\u5c06\u5e94\u7528\u4e8e\u6bcf\u4e2a\u5143\u7d20\uff0c\u5e76\u4f7f\u7528\u8fd4\u56de\u503c\u521b\u5efa\u7ed3\u679cDataFrame\u5bf9\u8c61\u3002<\/p>\n<pre class=\"post-pre\"><code>import pandas as pd\r\nimport math\r\n\r\ndf = pd.DataFrame({'A': [1, 4], 'B': [100, 400]})\r\ndf1 = df.applymap(math.sqrt)\r\n\r\nprint(df)\r\nprint(df1)\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code>   A    B\r\n0  1  100\r\n1  4  400\r\n     A     B\r\n0  1.0  10.0\r\n1  2.0  20.0\r\n<\/code><\/pre>\n<p>\u8ba9\u6211\u4eec\u770b\u4e00\u4e2a\u4f7f\u7528applymap()\u51fd\u6570\u5c06\u6240\u6709\u5143\u7d20\u7684\u503c\u8f6c\u6362\u4e3a\u5927\u5199\u7684\u793a\u4f8b\u3002<\/p>\n<pre class=\"post-pre\"><code>import pandas as pd\r\n\r\ndf = pd.DataFrame({'Name': ['Pankaj', 'Meghna'], 'Role': ['ceo', 'cto']})\r\n\r\ndf1 = df.applymap(str.upper)\r\n\r\nprint(df)\r\nprint(df1)\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code>     Name Role\r\n0  Pankaj  ceo\r\n1  Meghna  cto\r\n\r\n     Name Role\r\n0  PANKAJ  CEO\r\n1  MEGHNA  CTO\r\n<\/code><\/pre>\n<h2>\u53c2\u8003\u8d44\u6599<\/h2>\n<ul class=\"post-ul\">\n<li>Python Pandas\u6a21\u5757\u6559\u7a0b<\/li>\n<li>Pandas apply() API\u6587\u6863<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u662f\u6587\u7ae0\u300aPandas DataFrame \u7684 apply() \u793a\u4f8b\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51711\u90e8\u5206\uff09\u3002 Pandas  [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1476,737,273,280,1477],"class_list":["post-485","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-apply","tag-dataframe","tag-pandas","tag-python"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u638c\u63e1Pandas DataFrame apply()\u65b9\u6cd5\uff1a10\u4e2a\u5b9e\u7528\u793a\u4f8b\u8be6\u89e3 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u672c\u6587\u8be6\u7ec6\u4ecb\u7ecdPandas DataFrame\u7684apply()\u65b9\u6cd5\uff0c\u901a\u8fc710\u4e2a\u5b9e\u7528\u793a\u4f8b\u5e2e\u52a9\u60a8\u638c\u63e1\u8fd9\u4e00\u5f3a\u5927\u7684\u6570\u636e\u5904\u7406\u5de5\u5177\u3002\u4ece\u57fa\u7840\u7528\u6cd5\u5230\u9ad8\u7ea7\u6280\u5de7\uff0c\u6db5\u76d6apply()\u51fd\u6570\u5728\u6570\u636e\u5206\u6790\u4e2d\u7684\u5404\u79cd\u5e94\u7528\u573a\u666f\uff0c\u662fPython\u6570\u636e\u5206\u6790\u5e08\u548c\u5f00\u53d1\u8005\u7684\u5fc5\u5907\u6559\u7a0b\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/pandas-dataframe-\u7684-apply-\u793a\u4f8b\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u638c\u63e1Pandas DataFrame apply()\u65b9\u6cd5\uff1a10\u4e2a\u5b9e\u7528\u793a\u4f8b\u8be6\u89e3\" \/>\n<meta property=\"og:description\" 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content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u79d1, \u96c5\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/pandas-dataframe-%e7%9a%84-apply-%e7%a4%ba%e4%be%8b\/\",\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/pandas-dataframe-%e7%9a%84-apply-%e7%a4%ba%e4%be%8b\/\",\"name\":\"\u638c\u63e1Pandas DataFrame apply()\u65b9\u6cd5\uff1a10\u4e2a\u5b9e\u7528\u793a\u4f8b\u8be6\u89e3 - Blog - Silicon 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