{"id":1132410,"date":"2025-01-08T20:56:57","date_gmt":"2025-01-08T12:56:57","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1132410.html"},"modified":"2025-01-08T20:57:00","modified_gmt":"2025-01-08T12:57:00","slug":"python%e5%a6%82%e4%bd%95%e5%8f%96%e7%9a%84csv%e6%9f%90%e8%a1%8c%e6%9f%90%e5%88%97%e7%9a%84%e5%80%bc","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1132410.html","title":{"rendered":"python\u5982\u4f55\u53d6\u7684csv\u67d0\u884c\u67d0\u5217\u7684\u503c"},"content":{"rendered":"<p style=\"text-align:center;\" ><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/25101958\/617a7c30-5feb-4438-a077-6b85ea3bfc50.webp\" alt=\"python\u5982\u4f55\u53d6\u7684csv\u67d0\u884c\u67d0\u5217\u7684\u503c\" \/><\/p>\n<p><p> <strong>\u5728Python\u4e2d\uff0c\u4f7f\u7528pandas\u5e93\u53ef\u4ee5\u65b9\u4fbf\u5730\u4eceCSV\u6587\u4ef6\u4e2d\u83b7\u53d6\u7279\u5b9a\u884c\u7279\u5b9a\u5217\u7684\u503c<\/strong>\u3001<strong>\u6253\u5f00CSV\u6587\u4ef6\u5e76\u8bfb\u53d6\u6570\u636e<\/strong>\u3001<strong>\u4f7f\u7528iloc\u6216loc\u65b9\u6cd5\u5b9a\u4f4d\u7279\u5b9a\u884c\u548c\u5217<\/strong>\u3002\u5176\u4e2d\uff0cpandas\u5e93\u662f\u5904\u7406CSV\u6587\u4ef6\u7684\u5e38\u7528\u5de5\u5177\u3002\u4e0b\u9762\u8be6\u7ec6\u63cf\u8ff0\u5982\u4f55\u4f7f\u7528pandas\u5e93\u6765\u5b8c\u6210\u8fd9\u4e00\u4efb\u52a1\u3002<\/p>\n<\/p>\n<h2><strong>\u4e00\u3001\u5b89\u88c5\u548c\u5bfc\u5165\u5fc5\u8981\u7684\u5e93<\/strong><\/h2>\n<p><p>\u5728\u4f7f\u7528pandas\u5e93\u4e4b\u524d\uff0c\u9700\u8981\u786e\u4fdd\u5176\u5df2\u5b89\u88c5\u3002\u5982\u679c\u5c1a\u672a\u5b89\u88c5\uff0c\u53ef\u4ee5\u4f7f\u7528pip\u8fdb\u884c\u5b89\u88c5\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-bash\">pip install pandas<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728Python\u811a\u672c\u4e2d\u5bfc\u5165\u6240\u9700\u7684\u5e93\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import pandas as pd<\/p>\n<p><\/code><\/pre>\n<\/p>\n<h2><strong>\u4e8c\u3001\u8bfb\u53d6CSV\u6587\u4ef6<\/strong><\/h2>\n<p><p>\u4f7f\u7528pandas\u5e93\u4e2d\u7684<code>read_csv<\/code>\u51fd\u6570\u8bfb\u53d6CSV\u6587\u4ef6\u3002\u5047\u8bbe\u6709\u4e00\u4e2a\u540d\u4e3a<code>data.csv<\/code>\u7684\u6587\u4ef6\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">df = pd.read_csv(&#39;data.csv&#39;)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u6b64\u51fd\u6570\u5c06CSV\u6587\u4ef6\u8bfb\u53d6\u4e3a\u4e00\u4e2aDataFrame\u5bf9\u8c61\uff0cDataFrame\u662fpandas\u5e93\u4e2d\u7684\u6838\u5fc3\u6570\u636e\u7ed3\u6784\uff0c\u7c7b\u4f3c\u4e8e\u7535\u5b50\u8868\u683c\u6216SQL\u8868\u3002<\/p>\n<\/p>\n<h2><strong>\u4e09\u3001\u5b9a\u4f4d\u7279\u5b9a\u884c\u548c\u5217<\/strong><\/h2>\n<p><h2>1\u3001\u4f7f\u7528iloc\u65b9\u6cd5<\/h2>\n<\/p>\n<p><p><code>iloc<\/code>\u65b9\u6cd5\u662f\u57fa\u4e8e\u6574\u6570\u4f4d\u7f6e\u8fdb\u884c\u5b9a\u4f4d\u7684\uff0c\u53ef\u4ee5\u7528\u6765\u83b7\u53d6\u7279\u5b9a\u884c\u548c\u5217\u7684\u503c\u3002\u4f8b\u5982\uff0c\u8981\u83b7\u53d6\u7b2c2\u884c\u7b2c3\u5217\u7684\u503c\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">value = df.iloc[1, 2]<\/p>\n<p>print(value)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728<code>iloc<\/code>\u65b9\u6cd5\u4e2d\uff0c\u884c\u548c\u5217\u7684\u7d22\u5f15\u90fd\u662f\u4ece0\u5f00\u59cb\u7684\uff0c\u56e0\u6b64<code>iloc[1, 2]<\/code>\u8868\u793a\u83b7\u53d6\u7b2c2\u884c\u7b2c3\u5217\u7684\u503c\u3002<\/p>\n<\/p>\n<p><h2>2\u3001\u4f7f\u7528loc\u65b9\u6cd5<\/h2>\n<\/p>\n<p><p><code>loc<\/code>\u65b9\u6cd5\u662f\u57fa\u4e8e\u6807\u7b7e\u8fdb\u884c\u5b9a\u4f4d\u7684\uff0c\u53ef\u4ee5\u7528\u6765\u83b7\u53d6\u7279\u5b9a\u884c\u548c\u5217\u7684\u503c\u3002\u5047\u8bbeCSV\u6587\u4ef6\u6709\u4ee5\u4e0b\u7ed3\u6784\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-csv\">index,name,age,city<\/p>\n<p>0,Alice,30,New York<\/p>\n<p>1,Bob,25,Los Angeles<\/p>\n<p>2,Charlie,35,Chicago<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8981\u83b7\u53d6\u7d22\u5f15\u4e3a1\u4e14\u5217\u540d\u4e3a<code>name<\/code>\u7684\u503c\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">value = df.loc[1, &#39;name&#39;]<\/p>\n<p>print(value)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728<code>loc<\/code>\u65b9\u6cd5\u4e2d\uff0c\u884c\u7d22\u5f15\u548c\u5217\u6807\u7b7e\u90fd\u76f4\u63a5\u4f7f\u7528DataFrame\u4e2d\u7684\u6807\u7b7e\u3002<\/p>\n<\/p>\n<h2><strong>\u56db\u3001\u5904\u7406\u7f3a\u5931\u503c<\/strong><\/h2>\n<p><p>\u5728\u5b9e\u9645\u64cd\u4f5c\u4e2d\uff0cCSV\u6587\u4ef6\u4e2d\u53ef\u80fd\u5305\u542b\u7f3a\u5931\u503c\uff0c\u9700\u8981\u5bf9\u5176\u8fdb\u884c\u5904\u7406\u3002pandas\u5e93\u63d0\u4f9b\u4e86\u591a\u79cd\u65b9\u6cd5\u6765\u5904\u7406\u7f3a\u5931\u503c\uff0c\u4f8b\u5982\u4f7f\u7528<code>fillna<\/code>\u51fd\u6570\u586b\u5145\u7f3a\u5931\u503c\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">df.fillna(0, inplace=True)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u5c06\u75280\u66ff\u6362\u6240\u6709\u7f3a\u5931\u503c\uff0c\u5e76\u5bf9\u539fDataFrame\u8fdb\u884c\u4fee\u6539\u3002<\/p>\n<\/p>\n<h2><strong>\u4e94\u3001\u5176\u4ed6\u5b9e\u7528\u6280\u5de7<\/strong><\/h2>\n<p><h2>1\u3001\u7b5b\u9009\u6570\u636e<\/h2>\n<\/p>\n<p><p>\u53ef\u4ee5\u4f7f\u7528\u6761\u4ef6\u7b5b\u9009\u6765\u83b7\u53d6\u7279\u5b9a\u6570\u636e\u3002\u4f8b\u5982\uff0c\u8981\u83b7\u53d6\u5e74\u9f84\u5927\u4e8e30\u7684\u6240\u6709\u884c\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">filtered_df = df[df[&#39;age&#39;] &gt; 30]<\/p>\n<p>print(filtered_df)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h2>2\u3001\u5bfc\u51fa\u6570\u636e<\/h2>\n<\/p>\n<p><p>\u5904\u7406\u5b8c\u6570\u636e\u540e\uff0c\u53ef\u4ee5\u5c06\u5176\u5bfc\u51fa\u5230\u65b0\u7684CSV\u6587\u4ef6\u4e2d\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">df.to_csv(&#39;output.csv&#39;, index=False)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8fd9\u5c06DataFrame\u5bf9\u8c61\u5bfc\u51fa\u4e3a\u540d\u4e3a<code>output.csv<\/code>\u7684\u6587\u4ef6\uff0c\u4e14\u4e0d\u5305\u542b\u884c\u7d22\u5f15\u3002<\/p>\n<\/p>\n<h2><strong>\u516d\u3001\u5177\u4f53\u793a\u4f8b<\/strong><\/h2>\n<p><p>\u5047\u8bbe\u6709\u4e00\u4e2a\u540d\u4e3a<code>sample.csv<\/code>\u7684\u6587\u4ef6\uff0c\u5185\u5bb9\u5982\u4e0b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-csv\">id,name,age,score<\/p>\n<p>1,John,22,85<\/p>\n<p>2,Jane,23,90<\/p>\n<p>3,Tom,24,75<\/p>\n<p>4,Alice,25,95<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8981\u83b7\u53d6\u7b2c3\u884c\u7b2c2\u5217\u7684\u503c\uff08\u5373<code>Tom<\/code>\u7684<code>name<\/code>\uff09\uff0c\u53ef\u4ee5\u6267\u884c\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import pandas as pd<\/p>\n<h2><strong>\u8bfb\u53d6CSV\u6587\u4ef6<\/strong><\/h2>\n<p>df = pd.read_csv(&#39;sample.csv&#39;)<\/p>\n<h2><strong>\u83b7\u53d6\u7279\u5b9a\u884c\u7279\u5b9a\u5217\u7684\u503c<\/strong><\/h2>\n<p>value = df.iloc[2, 1]<\/p>\n<p>print(value)  # \u8f93\u51fa: Tom<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u540c\u65f6\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528<code>loc<\/code>\u65b9\u6cd5\u83b7\u53d6\u7d22\u5f15\u4e3a2\u4e14\u5217\u540d\u4e3a<code>name<\/code>\u7684\u503c\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">value = df.loc[2, &#39;name&#39;]<\/p>\n<p>print(value)  # \u8f93\u51fa: Tom<\/p>\n<p><\/code><\/pre>\n<\/p>\n<h2><strong>\u4e03\u3001\u603b\u7ed3<\/strong><\/h2>\n<p><p>\u672c\u6587\u4ecb\u7ecd\u4e86\u5982\u4f55\u4f7f\u7528pandas\u5e93\u4eceCSV\u6587\u4ef6\u4e2d\u83b7\u53d6\u7279\u5b9a\u884c\u7279\u5b9a\u5217\u7684\u503c\u3002<strong>\u4f7f\u7528pandas\u5e93\u53ef\u4ee5\u65b9\u4fbf\u5730\u8bfb\u53d6\u548c\u5904\u7406CSV\u6587\u4ef6<\/strong>\u3001<strong>iloc\u65b9\u6cd5\u7528\u4e8e\u57fa\u4e8e\u6574\u6570\u4f4d\u7f6e\u5b9a\u4f4d<\/strong>\u3001<strong>loc\u65b9\u6cd5\u7528\u4e8e\u57fa\u4e8e\u6807\u7b7e\u5b9a\u4f4d<\/strong>\u3002\u6b64\u5916\uff0c\u8fd8\u4ecb\u7ecd\u4e86\u5982\u4f55\u5904\u7406\u7f3a\u5931\u503c\u3001\u7b5b\u9009\u6570\u636e\u548c\u5bfc\u51fa\u6570\u636e\u3002\u901a\u8fc7\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u53ef\u4ee5\u9ad8\u6548\u5730\u64cd\u4f5c\u548c\u5206\u6790CSV\u6587\u4ef6\u4e2d\u7684\u6570\u636e\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p> <strong>\u5982\u4f55\u5728Python\u4e2d\u8bfb\u53d6CSV\u6587\u4ef6\u7684\u7279\u5b9a\u884c\u548c\u5217\u7684\u503c\uff1f<\/strong><br \/>\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528<code>pandas<\/code>\u5e93\u6765\u65b9\u4fbf\u5730\u8bfb\u53d6CSV\u6587\u4ef6\u3002\u9996\u5148\uff0c\u786e\u4fdd\u4f60\u5df2\u7ecf\u5b89\u88c5\u4e86<code>pandas<\/code>\u5e93\u3002\u7136\u540e\uff0c\u4f7f\u7528<code>read_csv<\/code>\u51fd\u6570\u8bfb\u53d6CSV\u6587\u4ef6\uff0c\u5e76\u901a\u8fc7\u884c\u5217\u7d22\u5f15\u63d0\u53d6\u7279\u5b9a\u7684\u503c\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code class=\"language-python\">import pandas as pd\n\n# \u8bfb\u53d6CSV\u6587\u4ef6\ndata = pd.read_csv(&#39;your_file.csv&#39;)\n\n# \u63d0\u53d6\u7279\u5b9a\u884c\u548c\u5217\u7684\u503c\uff0c\u4f8b\u5982\u7b2c2\u884c\u7b2c3\u5217\nvalue = data.iloc[1, 2]\nprint(value)\n<\/code><\/pre>\n<p>\u8fd9\u79cd\u65b9\u6cd5\u80fd\u591f\u9ad8\u6548\u5730\u83b7\u53d6\u6240\u9700\u6570\u636e\uff0c\u540c\u65f6\u652f\u6301\u591a\u79cd\u6570\u636e\u683c\u5f0f\u3002<\/p>\n<p><strong>\u5728\u5904\u7406CSV\u6587\u4ef6\u65f6\uff0c\u5982\u4f55\u9ad8\u6548\u5730\u5b9a\u4f4d\u5230\u7279\u5b9a\u7684\u884c\u548c\u5217\uff1f<\/strong><br \/>\u5728\u4f7f\u7528<code>pandas<\/code>\u65f6\uff0c\u5229\u7528<code>iloc<\/code>\u548c<code>loc<\/code>\u65b9\u6cd5\u53ef\u4ee5\u975e\u5e38\u65b9\u4fbf\u5730\u5b9a\u4f4d\u5230\u7279\u5b9a\u7684\u884c\u548c\u5217\u3002<code>iloc<\/code>\u4f7f\u7528\u6574\u6570\u4f4d\u7f6e\u8fdb\u884c\u7d22\u5f15\uff0c\u800c<code>loc<\/code>\u6839\u636e\u6807\u7b7e\u8fdb\u884c\u7d22\u5f15\u3002\u4f8b\u5982\uff0c\u5982\u679c\u77e5\u9053\u7279\u5b9a\u884c\u7684\u6807\u7b7e\uff0c\u53ef\u4ee5\u4f7f\u7528<code>data.loc[&#39;row_label&#39;, &#39;column_label&#39;]<\/code>\u6765\u83b7\u53d6\u6570\u636e\u3002<\/p>\n<p><strong>\u5982\u4f55\u5904\u7406CSV\u6587\u4ef6\u4e2d\u7684\u7a7a\u503c\u4ee5\u786e\u4fdd\u6570\u636e\u7684\u5b8c\u6574\u6027\uff1f<\/strong><br \/>\u5728\u8bfb\u53d6CSV\u6587\u4ef6\u65f6\uff0c\u53ef\u80fd\u4f1a\u9047\u5230\u7a7a\u503c\u3002\u53ef\u4ee5\u4f7f\u7528<code>dropna()<\/code>\u65b9\u6cd5\u5220\u9664\u5305\u542b\u7a7a\u503c\u7684\u884c\u6216\u5217\uff0c\u6216\u8005\u4f7f\u7528<code>fillna()<\/code>\u65b9\u6cd5\u586b\u5145\u7a7a\u503c\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"language-python\"># \u5220\u9664\u7a7a\u503c\ncleaned_data = data.dropna()\n\n# \u586b\u5145\u7a7a\u503c\nfilled_data = data.fillna(0)  # \u5c06\u7a7a\u503c\u586b\u5145\u4e3a0\n<\/code><\/pre>\n<p>\u8fd9\u4e9b\u65b9\u6cd5\u80fd\u591f\u786e\u4fdd\u5728\u6570\u636e\u5206\u6790\u8fc7\u7a0b\u4e2d\uff0c\u6570\u636e\u7684\u5b8c\u6574\u6027\u548c\u51c6\u786e\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0c\u4f7f\u7528pandas\u5e93\u53ef\u4ee5\u65b9\u4fbf\u5730\u4eceCSV\u6587\u4ef6\u4e2d\u83b7\u53d6\u7279\u5b9a\u884c\u7279\u5b9a\u5217\u7684\u503c\u3001\u6253\u5f00CSV\u6587\u4ef6\u5e76\u8bfb\u53d6\u6570\u636e\u3001\u4f7f [&hellip;]","protected":false},"author":3,"featured_media":1132417,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1132410"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=1132410"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1132410\/revisions"}],"predecessor-version":[{"id":1132419,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1132410\/revisions\/1132419"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1132417"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1132410"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1132410"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1132410"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}