{"id":948396,"date":"2024-12-27T00:03:14","date_gmt":"2024-12-26T16:03:14","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/948396.html"},"modified":"2024-12-27T00:03:15","modified_gmt":"2024-12-26T16:03:15","slug":"python-%e5%a6%82%e4%bd%95%e8%af%bbcsv","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/948396.html","title":{"rendered":"python \u5982\u4f55\u8bfbcsv"},"content":{"rendered":"<p style=\"text-align:center;\" ><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/25083802\/f6f89ccc-6076-40bc-ab55-884c850be96f.webp\" alt=\"python \u5982\u4f55\u8bfbcsv\" \/><\/p>\n<p><p> <strong>\u5728Python\u4e2d\u8bfb\u53d6CSV\u6587\u4ef6\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u5e38\u7528\u7684\u5305\u62ec\u4f7f\u7528csv\u6a21\u5757\u3001pandas\u5e93\u3001numpy\u5e93\u7b49\u3002<\/strong>\u5176\u4e2d\uff0c<strong>\u4f7f\u7528pandas\u5e93<\/strong>\u662f\u6700\u4e3a\u4fbf\u6377\u548c\u9ad8\u6548\u7684\u65b9\u6cd5\uff0c\u56e0\u4e3a\u5b83\u4e0d\u4ec5\u53ef\u4ee5\u8f7b\u677e\u8bfb\u53d6CSV\u6587\u4ef6\uff0c\u8fd8\u80fd\u5bf9\u6570\u636e\u8fdb\u884c\u590d\u6742\u7684\u5206\u6790\u548c\u5904\u7406\u3002pandas\u5e93\u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u6570\u636e\u7ed3\u6784\u548c\u64cd\u4f5c\u5de5\u5177\uff0c\u9002\u7528\u4e8e\u5904\u7406\u6570\u503c\u8868\u683c\u6570\u636e\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u901a\u8fc7\u4e0d\u540c\u7684\u65b9\u6cd5\u8bfb\u53d6CSV\u6587\u4ef6\uff0c\u5e76\u5bf9\u6bcf\u79cd\u65b9\u6cd5\u7684\u4f18\u7f3a\u70b9\u8fdb\u884c\u5206\u6790\u3002<\/p>\n<\/p>\n<p><p>\u4e00\u3001\u4f7f\u7528CSV\u6a21\u5757\u8bfb\u53d6<\/p>\n<\/p>\n<p><p>Python\u5185\u7f6e\u7684csv\u6a21\u5757\u63d0\u4f9b\u4e86\u57fa\u7840\u7684CSV\u6587\u4ef6\u8bfb\u53d6\u529f\u80fd\uff0c\u9002\u5408\u5904\u7406\u7b80\u5355\u7684CSV\u6587\u4ef6\u3002<\/p>\n<\/p>\n<ol>\n<li><strong>\u57fa\u672c\u8bfb\u53d6<\/strong><\/li>\n<\/ol>\n<p><p>\u4f7f\u7528csv.reader\u53ef\u4ee5\u9010\u884c\u8bfb\u53d6CSV\u6587\u4ef6\u3002\u6bcf\u884c\u6570\u636e\u4f1a\u4f5c\u4e3a\u4e00\u4e2a\u5217\u8868\u8fd4\u56de\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import csv<\/p>\n<p>with open(&#39;data.csv&#39;, newline=&#39;&#39;) as csvfile:<\/p>\n<p>    csvreader = csv.reader(csvfile)<\/p>\n<p>    for row in csvreader:<\/p>\n<p>        print(row)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<ol start=\"2\">\n<li><strong>\u4f7f\u7528DictReader<\/strong><\/li>\n<\/ol>\n<p><p>DictReader\u5c06\u6bcf\u4e00\u884c\u6570\u636e\u8f6c\u6362\u4e3a\u4e00\u4e2a\u5b57\u5178\uff0c\u5b57\u5178\u7684\u952e\u662fCSV\u6587\u4ef6\u7684\u8868\u5934\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import csv<\/p>\n<p>with open(&#39;data.csv&#39;, newline=&#39;&#39;) as csvfile:<\/p>\n<p>    csvreader = csv.DictReader(csvfile)<\/p>\n<p>    for row in csvreader:<\/p>\n<p>        print(row)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p><strong>\u4f18\u70b9\uff1a<\/strong>  <\/p>\n<\/p>\n<ul>\n<li>\u5185\u7f6e\u6a21\u5757\uff0c\u65e0\u9700\u5b89\u88c5\u989d\u5916\u7684\u5e93\u3002<\/li>\n<li>\u80fd\u5904\u7406\u7b80\u5355\u7684CSV\u6587\u4ef6\u3002<\/li>\n<\/ul>\n<p><p><strong>\u7f3a\u70b9\uff1a<\/strong>  <\/p>\n<\/p>\n<ul>\n<li>\u529f\u80fd\u76f8\u5bf9\u7b80\u5355\uff0c\u4e0d\u652f\u6301\u590d\u6742\u7684\u6570\u636e\u64cd\u4f5c\u3002<\/li>\n<li>\u5904\u7406\u5927\u6570\u636e\u91cf\u65f6\u6548\u7387\u4e0d\u9ad8\u3002<\/li>\n<\/ul>\n<p><p>\u4e8c\u3001\u4f7f\u7528Pandas\u5e93\u8bfb\u53d6<\/p>\n<\/p>\n<p><p>Pandas\u662fPython\u4e2d\u7528\u4e8e\u6570\u636e\u5206\u6790\u548c\u5904\u7406\u7684\u5f3a\u5927\u5e93\uff0c\u80fd\u8f7b\u677e\u8bfb\u53d6\u548c\u5904\u7406CSV\u6587\u4ef6\u3002<\/p>\n<\/p>\n<ol>\n<li><strong>\u57fa\u672c\u8bfb\u53d6<\/strong><\/li>\n<\/ol>\n<p><p>\u4f7f\u7528pandas\u7684read_csv\u51fd\u6570\u53ef\u4ee5\u5feb\u901f\u8bfb\u53d6CSV\u6587\u4ef6\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import pandas as pd<\/p>\n<p>df = pd.read_csv(&#39;data.csv&#39;)<\/p>\n<p>print(df.head())<\/p>\n<p><\/code><\/pre>\n<\/p>\n<ol start=\"2\">\n<li><strong>\u6307\u5b9a\u5206\u9694\u7b26<\/strong><\/li>\n<\/ol>\n<p><p>\u5982\u679cCSV\u6587\u4ef6\u4f7f\u7528\u5176\u4ed6\u5b57\u7b26\u4f5c\u4e3a\u5206\u9694\u7b26\uff0c\u53ef\u4ee5\u901a\u8fc7delimiter\u53c2\u6570\u6307\u5b9a\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import pandas as pd<\/p>\n<p>df = pd.read_csv(&#39;data.csv&#39;, delimiter=&#39;;&#39;)<\/p>\n<p>print(df.head())<\/p>\n<p><\/code><\/pre>\n<\/p>\n<ol start=\"3\">\n<li><strong>\u5904\u7406\u7f3a\u5931\u6570\u636e<\/strong><\/li>\n<\/ol>\n<p><p>\u5728\u8bfb\u53d6\u65f6\u53ef\u4ee5\u76f4\u63a5\u5904\u7406\u7f3a\u5931\u6570\u636e\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import pandas as pd<\/p>\n<p>df = pd.read_csv(&#39;data.csv&#39;, na_values=[&#39;NA&#39;, &#39;N\/A&#39;])<\/p>\n<p>print(df.head())<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p><strong>\u4f18\u70b9\uff1a<\/strong>  <\/p>\n<\/p>\n<ul>\n<li>\u529f\u80fd\u5f3a\u5927\uff0c\u652f\u6301\u590d\u6742\u7684\u6570\u636e\u5206\u6790\u548c\u5904\u7406\u3002<\/li>\n<li>\u5904\u7406\u5927\u6570\u636e\u91cf\u65f6\u6548\u7387\u8f83\u9ad8\u3002<\/li>\n<li>\u63d0\u4f9b\u4e30\u5bcc\u7684\u53c2\u6570\u9009\u9879\uff0c\u7075\u6d3b\u6027\u9ad8\u3002<\/li>\n<\/ul>\n<p><p><strong>\u7f3a\u70b9\uff1a<\/strong>  <\/p>\n<\/p>\n<ul>\n<li>\u9700\u8981\u5b89\u88c5\u7b2c\u4e09\u65b9\u5e93\u3002<\/li>\n<li>\u5bf9\u4e8e\u975e\u5e38\u5927\u7684\u6570\u636e\u96c6\uff0c\u53ef\u80fd\u4f1a\u6d88\u8017\u8f83\u591a\u5185\u5b58\u3002<\/li>\n<\/ul>\n<p><p>\u4e09\u3001\u4f7f\u7528Numpy\u5e93\u8bfb\u53d6<\/p>\n<\/p>\n<p><p>Numpy\u662fPython\u4e2d\u7528\u4e8e\u6570\u503c\u8ba1\u7b97\u7684\u5e93\uff0c\u53ef\u4ee5\u7528\u4e8e\u8bfb\u53d6\u6570\u503c\u578bCSV\u6587\u4ef6\u3002<\/p>\n<\/p>\n<ol>\n<li><strong>\u57fa\u672c\u8bfb\u53d6<\/strong><\/li>\n<\/ol>\n<p><p>\u4f7f\u7528numpy\u7684genfromtxt\u51fd\u6570\u53ef\u4ee5\u8bfb\u53d6CSV\u6587\u4ef6\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import numpy as np<\/p>\n<p>data = np.genfromtxt(&#39;data.csv&#39;, delimiter=&#39;,&#39;, skip_header=1)<\/p>\n<p>print(data)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p><strong>\u4f18\u70b9\uff1a<\/strong>  <\/p>\n<\/p>\n<ul>\n<li>\u9002\u5408\u5904\u7406\u6570\u503c\u578b\u6570\u636e\u3002<\/li>\n<li>\u5728\u6570\u503c\u8fd0\u7b97\u65b9\u9762\u6027\u80fd\u4f18\u5f02\u3002<\/li>\n<\/ul>\n<p><p><strong>\u7f3a\u70b9\uff1a<\/strong>  <\/p>\n<\/p>\n<ul>\n<li>\u529f\u80fd\u4e0d\u5982pandas\u4e30\u5bcc\uff0c\u4e3b\u8981\u7528\u4e8e\u6570\u503c\u8ba1\u7b97\u3002<\/li>\n<li>\u5904\u7406\u6587\u672c\u6570\u636e\u65f6\u4e0d\u5982pandas\u65b9\u4fbf\u3002<\/li>\n<\/ul>\n<p><p>\u56db\u3001\u4f7f\u7528\u5176\u4ed6\u5e93<\/p>\n<\/p>\n<p><p>\u9664\u4e86\u4e0a\u8ff0\u65b9\u6cd5\uff0cPython\u4e2d\u8fd8\u6709\u5176\u4ed6\u5e93\u53ef\u4ee5\u7528\u4e8e\u8bfb\u53d6CSV\u6587\u4ef6\uff0c\u6bd4\u5982dask\u3001csvkit\u7b49\u3002<\/p>\n<\/p>\n<ol>\n<li><strong>\u4f7f\u7528Dask<\/strong><\/li>\n<\/ol>\n<p><p>Dask\u662f\u4e00\u4e2a\u5e76\u884c\u8ba1\u7b97\u5e93\uff0c\u9002\u5408\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import dask.dataframe as dd<\/p>\n<p>df = dd.read_csv(&#39;large_data.csv&#39;)<\/p>\n<p>print(df.head())<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p><strong>\u4f18\u70b9\uff1a<\/strong>  <\/p>\n<\/p>\n<ul>\n<li>\u9002\u5408\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\u3002<\/li>\n<li>\u652f\u6301\u5e76\u884c\u8ba1\u7b97\u3002<\/li>\n<\/ul>\n<p><p><strong>\u7f3a\u70b9\uff1a<\/strong>  <\/p>\n<\/p>\n<ul>\n<li>\u9700\u8981\u989d\u5916\u5b89\u88c5\u3002<\/li>\n<li>\u5b66\u4e60\u66f2\u7ebf\u8f83\u9661\u3002<\/li>\n<\/ul>\n<p><p>\u4e94\u3001\u603b\u7ed3\u4e0e\u5efa\u8bae<\/p>\n<\/p>\n<p><p>\u5728Python\u4e2d\u8bfb\u53d6CSV\u6587\u4ef6\u6709\u591a\u79cd\u65b9\u6cd5\uff0c\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u3002\u5bf9\u4e8e\u7b80\u5355\u7684CSV\u6587\u4ef6\uff0c\u4f7f\u7528\u5185\u7f6e\u7684csv\u6a21\u5757\u5373\u53ef\uff1b\u5bf9\u4e8e\u9700\u8981\u590d\u6742\u6570\u636e\u5206\u6790\u548c\u5904\u7406\u7684\u573a\u666f\uff0c\u63a8\u8350\u4f7f\u7528pandas\u5e93\uff1b\u5bf9\u4e8e\u6570\u503c\u8ba1\u7b97\uff0cnumpy\u662f\u4e00\u4e2a\u4e0d\u9519\u7684\u9009\u62e9\uff1b\u5982\u679c\u9700\u8981\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\uff0c\u53ef\u4ee5\u8003\u8651\u4f7f\u7528dask\u3002<\/p>\n<\/p>\n<p><p>\u603b\u7684\u6765\u8bf4\uff0c<strong>pandas\u5e93\u662f\u8bfb\u53d6\u548c\u5904\u7406CSV\u6587\u4ef6\u7684\u9996\u9009<\/strong>\uff0c\u56e0\u4e3a\u5176\u529f\u80fd\u5f3a\u5927\u4e14\u4f7f\u7528\u65b9\u4fbf\u3002\u800c\u5728\u5904\u7406\u7279\u5b9a\u7c7b\u578b\u7684\u6570\u636e\u6216\u7279\u6b8a\u9700\u6c42\u65f6\uff0c\u53ef\u4ee5\u7ed3\u5408\u5176\u4ed6\u65b9\u6cd5\u8fdb\u884c\u7075\u6d3b\u8fd0\u7528\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\uff1f<\/strong><br \/>\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u5185\u7f6e\u7684<code>csv<\/code>\u6a21\u5757\u6216<code>pandas<\/code>\u5e93\u6765\u8bfb\u53d6CSV\u6587\u4ef6\u3002\u4f7f\u7528<code>csv<\/code>\u6a21\u5757\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u6253\u5f00\u6587\u4ef6\u5e76\u4f7f\u7528<code>csv.reader<\/code>\u65b9\u6cd5\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9\uff1b\u4f7f\u7528<code>pandas<\/code>\u5219\u53ef\u4ee5\u901a\u8fc7<code>pd.read_csv<\/code>\u65b9\u6cd5\u7b80\u5316\u8fd9\u4e00\u8fc7\u7a0b\uff0c\u80fd\u591f\u66f4\u65b9\u4fbf\u5730\u8fdb\u884c\u6570\u636e\u5904\u7406\u548c\u5206\u6790\u3002<\/p>\n<p><strong>\u8bfb\u53d6CSV\u65f6\u5e38\u89c1\u7684\u7f16\u7801\u95ee\u9898\u5982\u4f55\u89e3\u51b3\uff1f<\/strong><br \/>\u5728\u8bfb\u53d6CSV\u6587\u4ef6\u65f6\uff0c\u6709\u65f6\u4f1a\u9047\u5230\u7f16\u7801\u95ee\u9898\uff0c\u6bd4\u5982UnicodeDecodeError\u3002\u8fd9\u901a\u5e38\u662f\u56e0\u4e3a\u6587\u4ef6\u7684\u7f16\u7801\u4e0e\u8bfb\u53d6\u65f6\u4f7f\u7528\u7684\u7f16\u7801\u4e0d\u5339\u914d\u3002\u53ef\u4ee5\u901a\u8fc7\u5728\u6253\u5f00\u6587\u4ef6\u65f6\u6307\u5b9a<code>encoding<\/code>\u53c2\u6570\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u4f8b\u5982<code>open(&#39;file.csv&#39;, encoding=&#39;utf-8&#39;)<\/code>\uff0c\u6216\u8005\u5728\u4f7f\u7528<code>pandas<\/code>\u65f6\uff0c\u76f4\u63a5\u5728<code>pd.read_csv<\/code>\u4e2d\u8bbe\u7f6e<code>encoding<\/code>\u53c2\u6570\u3002<\/p>\n<p><strong>\u5982\u4f55\u5904\u7406CSV\u6587\u4ef6\u4e2d\u7684\u7f3a\u5931\u503c\uff1f<\/strong><br \/>\u5728\u8bfb\u53d6CSV\u6587\u4ef6\u540e\uff0c\u6570\u636e\u4e2d\u53ef\u80fd\u4f1a\u51fa\u73b0\u7f3a\u5931\u503c\u3002\u4f7f\u7528<code>pandas<\/code>\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7<code>df.isnull()<\/code>\u65b9\u6cd5\u68c0\u67e5\u7f3a\u5931\u503c\uff0c\u5e76\u4f7f\u7528<code>df.fillna()<\/code>\u586b\u8865\u7f3a\u5931\u503c\u6216<code>df.dropna()<\/code>\u5220\u9664\u542b\u6709\u7f3a\u5931\u503c\u7684\u884c\u3002\u8fd9\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u5e2e\u52a9\u786e\u4fdd\u6570\u636e\u7684\u5b8c\u6574\u6027\uff0c\u4fbf\u4e8e\u540e\u7eed\u5206\u6790\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\u8bfb\u53d6CSV\u6587\u4ef6\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u5e38\u7528\u7684\u5305\u62ec\u4f7f\u7528csv\u6a21\u5757\u3001pandas\u5e93\u3001numpy\u5e93\u7b49\u3002\u5176\u4e2d\uff0c\u4f7f [&hellip;]","protected":false},"author":3,"featured_media":948402,"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\/948396"}],"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=948396"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/948396\/revisions"}],"predecessor-version":[{"id":948403,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/948396\/revisions\/948403"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/948402"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=948396"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=948396"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=948396"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}