{"id":1076418,"date":"2025-01-08T11:53:08","date_gmt":"2025-01-08T03:53:08","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1076418.html"},"modified":"2025-01-08T11:53:11","modified_gmt":"2025-01-08T03:53:11","slug":"python%e5%a6%82%e4%bd%95%e8%af%bb%e5%8f%96csv%e6%95%b0%e6%8d%ae%e6%96%87%e4%bb%b6-%e5%a4%a7%e5%b0%8f-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1076418.html","title":{"rendered":"python\u5982\u4f55\u8bfb\u53d6csv\u6570\u636e\u6587\u4ef6 \u5927\u5c0f"},"content":{"rendered":"<p style=\"text-align:center;\" ><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/24181012\/a880ca97-f9bb-40cd-bbf7-2b95910b802a.webp\" alt=\"python\u5982\u4f55\u8bfb\u53d6csv\u6570\u636e\u6587\u4ef6 \u5927\u5c0f\" \/><\/p>\n<p><p> <strong>Python\u8bfb\u53d6CSV\u6570\u636e\u6587\u4ef6\u7684\u5e38\u7528\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528pandas\u5e93\u3001csv\u6a21\u5757\u3001numpy\u5e93\u7b49\u3002<\/strong>\u5176\u4e2d\uff0c\u4f7f\u7528pandas\u5e93\u662f\u6700\u4fbf\u6377\u548c\u529f\u80fd\u6700\u5f3a\u5927\u7684\u65b9\u6cd5\uff0c\u56e0\u4e3a\u5b83\u4e0d\u4ec5\u53ef\u4ee5\u65b9\u4fbf\u5730\u8bfb\u53d6CSV\u6587\u4ef6\uff0c\u8fd8\u53ef\u4ee5\u8f7b\u677e\u5904\u7406\u548c\u5206\u6790\u6570\u636e\u3002<strong>\u901a\u8fc7\u8bfb\u53d6CSV\u6587\u4ef6\uff0c\u4f60\u53ef\u4ee5\u8f7b\u677e\u5730\u8fdb\u884c\u6570\u636e\u6e05\u6d17\u3001\u6570\u636e\u5206\u6790\u548c\u6570\u636e\u53ef\u89c6\u5316\u7b49\u4efb\u52a1\u3002<\/strong>\u672c\u6587\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u5e76\u63d0\u4f9b\u5b9e\u9645\u7684\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u4f7f\u7528pandas\u5e93\u8bfb\u53d6CSV\u6587\u4ef6<\/h3>\n<\/p>\n<p><p>pandas\u662f\u4e00\u4e2a\u529f\u80fd\u5f3a\u5927\u7684\u6570\u636e\u5904\u7406\u5e93\uff0c\u4e13\u4e3a\u6570\u636e\u5206\u6790\u548c\u6570\u636e\u64cd\u4f5c\u800c\u8bbe\u8ba1\u3002\u4f7f\u7528pandas\u8bfb\u53d6CSV\u6587\u4ef6\u53ea\u9700\u4e00\u884c\u4ee3\u7801\u3002<\/p>\n<\/p>\n<p><h4>\u5b89\u88c5pandas<\/h4>\n<\/p>\n<p><p>\u5728\u4f7f\u7528pandas\u4e4b\u524d\uff0c\u4f60\u9700\u8981\u5148\u5b89\u88c5\u5b83\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\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><h4>\u8bfb\u53d6CSV\u6587\u4ef6<\/h4>\n<\/p>\n<p><p>\u4f7f\u7528pandas\u8bfb\u53d6CSV\u6587\u4ef6\u975e\u5e38\u7b80\u5355\uff0c\u53ea\u9700\u4f7f\u7528<code>pandas.read_csv<\/code>\u51fd\u6570\u5373\u53ef\u3002\u793a\u4f8b\u5982\u4e0b\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;your_file.csv&#39;)<\/p>\n<h2><strong>\u6253\u5370\u524d\u4e94\u884c\u6570\u636e<\/strong><\/h2>\n<p>print(df.head())<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>\u5904\u7406\u7f3a\u5931\u503c<\/h4>\n<\/p>\n<p><p>\u5728\u8bfb\u53d6CSV\u6587\u4ef6\u65f6\uff0c\u4f60\u53ef\u80fd\u4f1a\u9047\u5230\u7f3a\u5931\u503c\uff08NaN\uff09\u3002pandas\u63d0\u4f9b\u4e86\u591a\u79cd\u65b9\u6cd5\u6765\u5904\u7406\u7f3a\u5931\u503c\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\"># \u586b\u5145\u7f3a\u5931\u503c<\/p>\n<p>df.fillna(0, inplace=True)<\/p>\n<h2><strong>\u5220\u9664\u5305\u542b\u7f3a\u5931\u503c\u7684\u884c<\/strong><\/h2>\n<p>df.dropna(inplace=True)<\/p>\n<h2><strong>\u5220\u9664\u5305\u542b\u7f3a\u5931\u503c\u7684\u5217<\/strong><\/h2>\n<p>df.dropna(axis=1, inplace=True)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e8c\u3001\u4f7f\u7528csv\u6a21\u5757\u8bfb\u53d6CSV\u6587\u4ef6<\/h3>\n<\/p>\n<p><p>Python\u5185\u7f6e\u7684csv\u6a21\u5757\u4e5f\u53ef\u4ee5\u7528\u6765\u8bfb\u53d6CSV\u6587\u4ef6\u3002\u867d\u7136\u4e0d\u5982pandas\u529f\u80fd\u5f3a\u5927\uff0c\u4f46\u5b83\u662f\u4e00\u4e2a\u8f7b\u91cf\u7ea7\u7684\u9009\u62e9\u3002<\/p>\n<\/p>\n<p><h4>\u8bfb\u53d6CSV\u6587\u4ef6<\/h4>\n<\/p>\n<p><p>\u4f7f\u7528csv\u6a21\u5757\u8bfb\u53d6CSV\u6587\u4ef6\u7684\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import csv<\/p>\n<p>with open(&#39;your_file.csv&#39;, newline=&#39;&#39;) as csvfile:<\/p>\n<p>    csvreader = csv.reader(csvfile, delimiter=&#39;,&#39;)<\/p>\n<p>    for row in csvreader:<\/p>\n<p>        print(row)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>\u8bfb\u53d6\u4e3a\u5b57\u5178<\/h4>\n<\/p>\n<p><p>csv\u6a21\u5757\u8fd8\u53ef\u4ee5\u5c06CSV\u6587\u4ef6\u8bfb\u53d6\u4e3a\u5b57\u5178\uff0c\u8fd9\u6837\u53ef\u4ee5\u65b9\u4fbf\u5730\u901a\u8fc7\u5217\u540d\u8bbf\u95ee\u6570\u636e\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import csv<\/p>\n<p>with open(&#39;your_file.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[&#39;column_name&#39;])<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e09\u3001\u4f7f\u7528numpy\u5e93\u8bfb\u53d6CSV\u6587\u4ef6<\/h3>\n<\/p>\n<p><p>numpy\u662f\u4e00\u4e2a\u7528\u4e8e\u79d1\u5b66\u8ba1\u7b97\u7684\u5e93\uff0c\u5b83\u4e5f\u53ef\u4ee5\u7528\u6765\u8bfb\u53d6CSV\u6587\u4ef6\uff0c\u7279\u522b\u9002\u7528\u4e8e\u6570\u503c\u6570\u636e\u7684\u5904\u7406\u3002<\/p>\n<\/p>\n<p><h4>\u5b89\u88c5numpy<\/h4>\n<\/p>\n<p><p>\u5728\u4f7f\u7528numpy\u4e4b\u524d\uff0c\u4f60\u9700\u8981\u5148\u5b89\u88c5\u5b83\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u8fdb\u884c\u5b89\u88c5\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-bash\">pip install numpy<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>\u8bfb\u53d6CSV\u6587\u4ef6<\/h4>\n<\/p>\n<p><p>\u4f7f\u7528numpy\u8bfb\u53d6CSV\u6587\u4ef6\u7684\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import numpy as np<\/p>\n<h2><strong>\u8bfb\u53d6CSV\u6587\u4ef6<\/strong><\/h2>\n<p>data = np.genfromtxt(&#39;your_file.csv&#39;, delimiter=&#39;,&#39;)<\/p>\n<h2><strong>\u6253\u5370\u6570\u636e<\/strong><\/h2>\n<p>print(data)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u56db\u3001\u5904\u7406\u5927\u578bCSV\u6587\u4ef6<\/h3>\n<\/p>\n<p><p>\u5f53CSV\u6587\u4ef6\u975e\u5e38\u5927\u65f6\uff0c\u8bfb\u53d6\u6574\u4e2a\u6587\u4ef6\u53ef\u80fd\u4f1a\u5360\u7528\u5927\u91cf\u5185\u5b58\u3002\u6b64\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u6cd5\uff1a<\/p>\n<\/p>\n<p><h4>\u5206\u5757\u8bfb\u53d6<\/h4>\n<\/p>\n<p><p>pandas\u63d0\u4f9b\u4e86\u5206\u5757\u8bfb\u53d6\u7684\u65b9\u6cd5\uff0c\u901a\u8fc7\u6307\u5b9a<code>chunksize<\/code>\u53c2\u6570\uff0c\u53ef\u4ee5\u5206\u5757\u8bfb\u53d6CSV\u6587\u4ef6\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import pandas as pd<\/p>\n<h2><strong>\u5206\u5757\u8bfb\u53d6CSV\u6587\u4ef6<\/strong><\/h2>\n<p>chunksize = 10000<\/p>\n<p>for chunk in pd.read_csv(&#39;your_file.csv&#39;, chunksize=chunksize):<\/p>\n<p>    # \u5904\u7406\u6bcf\u4e2a\u5757\u7684\u6570\u636e<\/p>\n<p>    print(chunk.head())<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>\u4f7f\u7528Dask\u5e93<\/h4>\n<\/p>\n<p><p>Dask\u662f\u4e00\u4e2a\u5e76\u884c\u8ba1\u7b97\u5e93\uff0c\u4e13\u4e3a\u5904\u7406\u5927\u6570\u636e\u800c\u8bbe\u8ba1\u3002\u5b83\u53ef\u4ee5\u5904\u7406\u8d85\u8fc7\u5185\u5b58\u5927\u5c0f\u7684\u6570\u636e\u96c6\u3002<\/p>\n<\/p>\n<p><h4>\u5b89\u88c5Dask<\/h4>\n<\/p>\n<p><p>\u5728\u4f7f\u7528Dask\u4e4b\u524d\uff0c\u4f60\u9700\u8981\u5148\u5b89\u88c5\u5b83\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u8fdb\u884c\u5b89\u88c5\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-bash\">pip install dask<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>\u8bfb\u53d6CSV\u6587\u4ef6<\/h4>\n<\/p>\n<p><p>\u4f7f\u7528Dask\u8bfb\u53d6CSV\u6587\u4ef6\u7684\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import dask.dataframe as dd<\/p>\n<h2><strong>\u8bfb\u53d6CSV\u6587\u4ef6<\/strong><\/h2>\n<p>df = dd.read_csv(&#39;your_file.csv&#39;)<\/p>\n<h2><strong>\u6253\u5370\u524d\u4e94\u884c\u6570\u636e<\/strong><\/h2>\n<p>print(df.head())<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e94\u3001\u603b\u7ed3<\/h3>\n<\/p>\n<p><p>Python\u63d0\u4f9b\u4e86\u591a\u79cd\u8bfb\u53d6CSV\u6587\u4ef6\u7684\u65b9\u6cd5\uff0c\u5305\u62ecpandas\u5e93\u3001csv\u6a21\u5757\u548cnumpy\u5e93\u7b49\u3002<strong>\u5176\u4e2d\uff0cpandas\u5e93\u662f\u6700\u4fbf\u6377\u548c\u529f\u80fd\u6700\u5f3a\u5927\u7684\u65b9\u6cd5\uff0c\u7279\u522b\u9002\u7528\u4e8e\u6570\u636e\u5206\u6790\u548c\u6570\u636e\u5904\u7406\u3002<\/strong>\u5bf9\u4e8e\u5927\u578bCSV\u6587\u4ef6\uff0c\u53ef\u4ee5\u4f7f\u7528pandas\u7684\u5206\u5757\u8bfb\u53d6\u529f\u80fd\u6216Dask\u5e93\u6765\u5904\u7406\u3002\u9009\u62e9\u9002\u5408\u4f60\u9700\u6c42\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u4f7f\u4f60\u7684\u6570\u636e\u5904\u7406\u5de5\u4f5c\u66f4\u52a0\u9ad8\u6548\u548c\u4fbf\u6377\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p> <strong>\u5982\u4f55\u4f7f\u7528Python\u8bfb\u53d6CSV\u6587\u4ef6\u5e76\u83b7\u53d6\u5176\u5927\u5c0f\uff1f<\/strong><br \/>\u8981\u8bfb\u53d6CSV\u6587\u4ef6\u5e76\u83b7\u53d6\u5176\u5927\u5c0f\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528Python\u7684\u5185\u7f6e<code>os<\/code>\u6a21\u5757\u6765\u83b7\u53d6\u6587\u4ef6\u7684\u5b57\u8282\u5927\u5c0f\uff0c\u5e76\u4f7f\u7528<code>pandas<\/code>\u5e93\u6216<code>csv<\/code>\u6a21\u5757\u6765\u8bfb\u53d6\u6570\u636e\u3002\u4f7f\u7528<code>os.path.getsize()<\/code>\u53ef\u4ee5\u8f7b\u677e\u83b7\u53d6\u6587\u4ef6\u5927\u5c0f\uff0c\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\u4ee3\u7801\uff1a  <\/p>\n<pre><code class=\"language-python\">import os\nimport pandas as pd\n\nfile_path = &#39;your_file.csv&#39;\nfile_size = os.path.getsize(file_path)\n\n# \u8bfb\u53d6CSV\u6587\u4ef6\ndata = pd.read_csv(file_path)\n\nprint(f&quot;\u6587\u4ef6\u5927\u5c0f: {file_size} \u5b57\u8282&quot;)\nprint(data.head())\n<\/code><\/pre>\n<p><strong>\u8bfb\u53d6CSV\u6587\u4ef6\u65f6\u9700\u8981\u6ce8\u610f\u54ea\u4e9b\u5e38\u89c1\u95ee\u9898\uff1f<\/strong><br \/>\u5728\u8bfb\u53d6CSV\u6587\u4ef6\u65f6\uff0c\u53ef\u80fd\u4f1a\u9047\u5230\u4e00\u4e9b\u95ee\u9898\uff0c\u4f8b\u5982\u6587\u4ef6\u8def\u5f84\u4e0d\u6b63\u786e\u3001\u7f16\u7801\u683c\u5f0f\u4e0d\u5339\u914d\u6216\u7f3a\u5931\u503c\u5904\u7406\u4e0d\u5f53\u3002\u786e\u4fdd\u6587\u4ef6\u8def\u5f84\u6b63\u786e\uff0c\u5e76\u6839\u636e\u9700\u8981\u6307\u5b9a<code>encoding<\/code>\u53c2\u6570\u3002\u5982\u679c\u6570\u636e\u4e2d\u5b58\u5728\u7f3a\u5931\u503c\uff0c\u4f7f\u7528<code>dropna()<\/code>\u6216<code>fillna()<\/code>\u65b9\u6cd5\u53ef\u4ee5\u5e2e\u52a9\u5904\u7406\u8fd9\u4e9b\u60c5\u51b5\u3002<\/p>\n<p><strong>\u5982\u4f55\u63d0\u9ad8\u8bfb\u53d6\u5927CSV\u6587\u4ef6\u7684\u6548\u7387\uff1f<\/strong><br \/>\u5904\u7406\u5927\u578bCSV\u6587\u4ef6\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528<code>chunksize<\/code>\u53c2\u6570\u6765\u5206\u5757\u8bfb\u53d6\u6570\u636e\uff0c\u8fd9\u6837\u53ef\u4ee5\u6709\u6548\u964d\u4f4e\u5185\u5b58\u5360\u7528\u3002\u6b64\u5916\uff0c\u8003\u8651\u4f7f\u7528<code>dask<\/code>\u5e93\uff0c\u5b83\u652f\u6301\u5904\u7406\u5927\u4e8e\u5185\u5b58\u7684\u6570\u636e\u96c6\uff0c\u53ef\u4ee5\u63d0\u4f9b\u66f4\u597d\u7684\u6027\u80fd\u548c\u7075\u6d3b\u6027\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a  <\/p>\n<pre><code class=\"language-python\">import dask.dataframe as dd\n\nfile_path = &#39;large_file.csv&#39;\ndata = dd.read_csv(file_path)\n\n# \u8fdb\u884c\u6570\u636e\u5206\u6790\u6216\u5904\u7406\nresult = data.compute()  # \u5c06Dask DataFrame\u8f6c\u6362\u4e3aPandas DataFrame\n<\/code><\/pre>\n<p>\u4f7f\u7528\u8fd9\u4e9b\u6280\u5de7\uff0c\u53ef\u4ee5\u66f4\u9ad8\u6548\u5730\u8bfb\u53d6CSV\u6587\u4ef6\u5e76\u8fdb\u884c\u5904\u7406\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Python\u8bfb\u53d6CSV\u6570\u636e\u6587\u4ef6\u7684\u5e38\u7528\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528pandas\u5e93\u3001csv\u6a21\u5757\u3001numpy\u5e93\u7b49\u3002\u5176\u4e2d\uff0c\u4f7f\u7528pand [&hellip;]","protected":false},"author":3,"featured_media":1076427,"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\/1076418"}],"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=1076418"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1076418\/revisions"}],"predecessor-version":[{"id":1076428,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1076418\/revisions\/1076428"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1076427"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1076418"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1076418"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1076418"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}