{"id":1145761,"date":"2025-01-08T23:11:01","date_gmt":"2025-01-08T15:11:01","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1145761.html"},"modified":"2025-01-08T23:11:03","modified_gmt":"2025-01-08T15:11:03","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8python%e8%af%bb%e5%8f%96%e6%96%87%e4%bb%b6%e7%9a%84%e4%b8%80%e9%83%a8%e5%88%86%e6%95%b0%e6%8d%ae","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1145761.html","title":{"rendered":"\u5982\u4f55\u4f7f\u7528Python\u8bfb\u53d6\u6587\u4ef6\u7684\u4e00\u90e8\u5206\u6570\u636e"},"content":{"rendered":"<p style=\"text-align:center;\" ><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/24182200\/79804f6c-c609-4afd-8483-22a94664b4bd.webp\" alt=\"\u5982\u4f55\u4f7f\u7528Python\u8bfb\u53d6\u6587\u4ef6\u7684\u4e00\u90e8\u5206\u6570\u636e\" \/><\/p>\n<p><p> <strong>\u8981\u4f7f\u7528Python\u8bfb\u53d6\u6587\u4ef6\u7684\u4e00\u90e8\u5206\u6570\u636e\uff0c\u4e3b\u8981\u6709\u4ee5\u4e0b\u51e0\u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528<code>readlines()<\/code>\u65b9\u6cd5\u3001\u5229\u7528<code>seek()<\/code>\u51fd\u6570\u3001\u4f7f\u7528<code>pandas<\/code>\u5e93\u3001\u4ee5\u53ca\u901a\u8fc7\u751f\u6210\u5668\u9010\u884c\u8bfb\u53d6\u3002<\/strong> \u6211\u4eec\u5c06\u5728\u672c\u6587\u4e2d\u8be6\u7ec6\u63a2\u8ba8\u8fd9\u51e0\u79cd\u65b9\u6cd5\u53ca\u5176\u9002\u7528\u573a\u666f\uff0c\u5e2e\u52a9\u4f60\u5728\u4e0d\u540c\u60c5\u51b5\u4e0b\u9009\u62e9\u6700\u5408\u9002\u7684\u65b9\u5f0f\u6765\u8bfb\u53d6\u6587\u4ef6\u7684\u4e00\u90e8\u5206\u6570\u636e\u3002\u9996\u5148\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd<code>readlines()<\/code>\u65b9\u6cd5\u7684\u4f7f\u7528\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u4f7f\u7528 <code>readlines()<\/code> \u65b9\u6cd5<\/h3>\n<\/p>\n<p><p>\u4f7f\u7528 <code>readlines()<\/code> \u65b9\u6cd5\u662f\u6700\u76f4\u89c2\u548c\u7b80\u5355\u7684\u65b9\u5f0f\u4e4b\u4e00\u3002\u6b64\u65b9\u6cd5\u4f1a\u5c06\u6587\u4ef6\u7684\u6240\u6709\u884c\u8bfb\u53d6\u5230\u4e00\u4e2a\u5217\u8868\u4e2d\uff0c\u7136\u540e\u53ef\u4ee5\u901a\u8fc7\u5207\u7247\u64cd\u4f5c\u6765\u83b7\u53d6\u6240\u9700\u7684\u90e8\u5206\u6570\u636e\u3002<\/p>\n<\/p>\n<p><h4>1. <code>readlines()<\/code> \u65b9\u6cd5\u4ecb\u7ecd<\/h4>\n<\/p>\n<p><p><code>readlines()<\/code> \u65b9\u6cd5\u4f1a\u8bfb\u53d6\u6587\u4ef6\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5e76\u5c06\u5b83\u4eec\u4f5c\u4e3a\u4e00\u4e2a\u5217\u8868\u8fd4\u56de\u3002\u6bcf\u4e00\u884c\u4f5c\u4e3a\u5217\u8868\u4e2d\u7684\u4e00\u4e2a\u5143\u7d20\uff0c\u5305\u542b\u6362\u884c\u7b26\u3002\u4f7f\u7528\u8fd9\u79cd\u65b9\u6cd5\u7684\u597d\u5904\u662f\u64cd\u4f5c\u7b80\u5355\uff0c\u5c24\u5176\u9002\u7528\u4e8e\u6587\u4ef6\u8f83\u5c0f\u7684\u60c5\u51b5\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">with open(&#39;example.txt&#39;, &#39;r&#39;) as file:<\/p>\n<p>    lines = file.readlines()<\/p>\n<p>    part_of_lines = lines[start_line:end_line]<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e8c\u3001\u5229\u7528 <code>seek()<\/code> \u51fd\u6570<\/h3>\n<\/p>\n<p><p>\u5728\u6587\u4ef6\u4e2d\u968f\u673a\u8bbf\u95ee\u6570\u636e\u65f6\uff0c<code>seek()<\/code> \u51fd\u6570\u975e\u5e38\u6709\u7528\u3002\u5b83\u5141\u8bb8\u6211\u4eec\u5728\u6587\u4ef6\u4e2d\u79fb\u52a8\u6307\u9488\u5230\u7279\u5b9a\u4f4d\u7f6e\uff0c\u4ee5\u4fbf\u4ece\u8be5\u4f4d\u7f6e\u5f00\u59cb\u8bfb\u53d6\u6570\u636e\u3002<\/p>\n<\/p>\n<p><h4>1. <code>seek()<\/code> \u51fd\u6570\u7684\u57fa\u672c\u7528\u6cd5<\/h4>\n<\/p>\n<p><p><code>seek()<\/code> \u51fd\u6570\u79fb\u52a8\u6587\u4ef6\u6307\u9488\u5230\u6307\u5b9a\u5b57\u8282\u4f4d\u7f6e\uff0c\u8fd9\u4f7f\u5f97\u6211\u4eec\u80fd\u591f\u4ece\u6587\u4ef6\u7684\u4efb\u610f\u4f4d\u7f6e\u5f00\u59cb\u8bfb\u53d6\u6570\u636e\u3002\u9002\u7528\u4e8e\u9700\u8981\u8bfb\u53d6\u7279\u5b9a\u4f4d\u7f6e\u6570\u636e\u7684\u60c5\u51b5\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">with open(&#39;example.txt&#39;, &#39;r&#39;) as file:<\/p>\n<p>    file.seek(100)  # \u79fb\u52a8\u6307\u9488\u5230\u6587\u4ef6\u7684\u7b2c100\u4e2a\u5b57\u8282<\/p>\n<p>    data = file.read(50)  # \u4ece\u5f53\u524d\u4f4d\u7f6e\u8bfb\u53d650\u4e2a\u5b57\u8282<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e09\u3001\u4f7f\u7528 <code>pandas<\/code> \u5e93<\/h3>\n<\/p>\n<p><p><code>pandas<\/code> \u662f\u4e00\u4e2a\u5f3a\u5927\u7684\u6570\u636e\u5206\u6790\u5e93\uff0c\u7279\u522b\u9002\u5408\u5904\u7406\u7ed3\u6784\u5316\u6570\u636e\u3002\u5b83\u53ef\u4ee5\u65b9\u4fbf\u5730\u8bfb\u53d6\u6587\u4ef6\u7684\u90e8\u5206\u6570\u636e\uff0c\u6bd4\u5982CSV\u6587\u4ef6\u7684\u90e8\u5206\u884c\u6216\u5217\u3002<\/p>\n<\/p>\n<p><h4>1. \u4f7f\u7528 <code>pandas<\/code> \u8bfb\u53d6\u90e8\u5206\u884c<\/h4>\n<\/p>\n<p><p>\u901a\u8fc7 <code>pandas<\/code> \u7684 <code>read_csv()<\/code> \u65b9\u6cd5\uff0c\u53ef\u4ee5\u6307\u5b9a\u8bfb\u53d6\u6587\u4ef6\u7684\u884c\u6570\u6216\u4ece\u7279\u5b9a\u884c\u5f00\u59cb\u8bfb\u53d6\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">import pandas as pd<\/p>\n<p>df = pd.read_csv(&#39;example.csv&#39;, skiprows=range(1, 100), nrows=50)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>2. \u4f7f\u7528 <code>pandas<\/code> \u8bfb\u53d6\u90e8\u5206\u5217<\/h4>\n<\/p>\n<p><p>\u540c\u6837\u7684\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u901a\u8fc7 <code>usecols<\/code> \u53c2\u6570\u6307\u5b9a\u9700\u8981\u8bfb\u53d6\u7684\u5217\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">df = pd.read_csv(&#39;example.csv&#39;, usecols=[&#39;column1&#39;, &#39;column2&#39;])<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u56db\u3001\u901a\u8fc7\u751f\u6210\u5668\u9010\u884c\u8bfb\u53d6<\/h3>\n<\/p>\n<p><p>\u751f\u6210\u5668\u662f\u4e00\u79cd\u9ad8\u6548\u7684\u5904\u7406\u5927\u6587\u4ef6\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u9010\u884c\u8bfb\u53d6\u6587\u4ef6\u800c\u4e0d\u4f1a\u4e00\u6b21\u6027\u5c06\u6587\u4ef6\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\u3002<\/p>\n<\/p>\n<p><h4>1. \u4f7f\u7528\u751f\u6210\u5668\u9010\u884c\u8bfb\u53d6\u6587\u4ef6<\/h4>\n<\/p>\n<p><p>\u901a\u8fc7\u751f\u6210\u5668\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u4e0d\u5360\u7528\u5927\u91cf\u5185\u5b58\u7684\u60c5\u51b5\u4e0b\u9010\u884c\u5904\u7406\u6587\u4ef6\u5185\u5bb9\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-python\">def read_file_by_line(file_name):<\/p>\n<p>    with open(file_name, &#39;r&#39;) as file:<\/p>\n<p>        for line in file:<\/p>\n<p>            yield line<\/p>\n<p>for line in read_file_by_line(&#39;example.txt&#39;):<\/p>\n<p>    print(line)<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e94\u3001\u603b\u7ed3<\/h3>\n<\/p>\n<p><p>\u901a\u8fc7\u4e0a\u8ff0\u51e0\u79cd\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u7075\u6d3b\u5730\u8bfb\u53d6\u6587\u4ef6\u7684\u4e00\u90e8\u5206\u6570\u636e\uff0c\u5177\u4f53\u9009\u62e9\u54ea\u79cd\u65b9\u6cd5\u53d6\u51b3\u4e8e\u6587\u4ef6\u7684\u5927\u5c0f\u3001\u6570\u636e\u7684\u7ed3\u6784\u4ee5\u53ca\u5177\u4f53\u7684\u9700\u6c42\u3002<strong><code>readlines()<\/code> \u65b9\u6cd5\u9002\u7528\u4e8e\u5c0f\u6587\u4ef6\uff0c<code>seek()<\/code> \u51fd\u6570\u9002\u7528\u4e8e\u9700\u8981\u968f\u673a\u8bbf\u95ee\u6587\u4ef6\u7684\u60c5\u51b5\uff0c<code>pandas<\/code> \u5e93\u9002\u5408\u5904\u7406\u7ed3\u6784\u5316\u6570\u636e\uff0c\u800c\u751f\u6210\u5668\u5219\u9002\u5408\u5904\u7406\u5927\u6587\u4ef6\u3002<\/strong><\/p>\n<\/p>\n<p><p>\u5728\u5b9e\u9645\u64cd\u4f5c\u4e2d\uff0c\u6211\u4eec\u5e94\u6839\u636e\u5177\u4f53\u60c5\u51b5\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\uff0c\u4ee5\u63d0\u9ad8\u6570\u636e\u5904\u7406\u7684\u6548\u7387\u548c\u7075\u6d3b\u6027\u3002\u5e0c\u671b\u901a\u8fc7\u672c\u6587\u7684\u8be6\u7ec6\u4ecb\u7ecd\uff0c\u80fd\u5e2e\u52a9\u4f60\u5728\u4e0d\u540c\u573a\u666f\u4e2d\u66f4\u597d\u5730\u4f7f\u7528Python\u8bfb\u53d6\u6587\u4ef6\u7684\u4e00\u90e8\u5206\u6570\u636e\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p> <strong>\u5982\u4f55\u5728Python\u4e2d\u6307\u5b9a\u8bfb\u53d6\u6587\u4ef6\u7684\u884c\u6570\uff1f<\/strong><br \/>\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u6587\u4ef6\u5bf9\u8c61\u7684<code>readlines()<\/code>\u65b9\u6cd5\u6765\u8bfb\u53d6\u6587\u4ef6\u7684\u7279\u5b9a\u884c\u6570\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u6253\u5f00\u6587\u4ef6\u5e76\u4f7f\u7528\u5207\u7247\u6280\u672f\u6765\u9009\u62e9\u6240\u9700\u7684\u884c\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a  <\/p>\n<pre><code class=\"language-python\">with open(&#39;example.txt&#39;, &#39;r&#39;) as file:\n    lines = file.readlines()[start:end]  # start\u548cend\u4e3a\u884c\u7684\u7d22\u5f15\n<\/code><\/pre>\n<p>\u8fd9\u79cd\u65b9\u5f0f\u80fd\u591f\u65b9\u4fbf\u5730\u63d0\u53d6\u51fa\u6587\u4ef6\u4e2d\u7684\u4e00\u90e8\u5206\u6570\u636e\u3002<\/p>\n<p><strong>\u5982\u679c\u6587\u4ef6\u975e\u5e38\u5927\uff0c\u5982\u4f55\u9ad8\u6548\u8bfb\u53d6\u90e8\u5206\u6570\u636e\uff1f<\/strong><br \/>\u5bf9\u4e8e\u5927\u6587\u4ef6\uff0c\u4f7f\u7528<code>readline()<\/code>\u65b9\u6cd5\u9010\u884c\u8bfb\u53d6\u4f1a\u66f4\u52a0\u9ad8\u6548\u3002\u901a\u8fc7\u4f7f\u7528\u5faa\u73af\u548c\u8ba1\u6570\u5668\uff0c\u53ef\u4ee5\u8bfb\u53d6\u6307\u5b9a\u8303\u56f4\u5185\u7684\u884c\u3002\u4f8b\u5982\uff1a  <\/p>\n<pre><code class=\"language-python\">with open(&#39;large_file.txt&#39;, &#39;r&#39;) as file:\n    for i in range(target_line_count):\n        line = file.readline()\n        # \u5904\u7406line\n<\/code><\/pre>\n<p>\u8fd9\u79cd\u65b9\u6cd5\u80fd\u591f\u5728\u5185\u5b58\u5360\u7528\u65b9\u9762\u66f4\u52a0\u8282\u7701\uff0c\u540c\u65f6\u4e5f\u80fd\u907f\u514d\u4e00\u6b21\u6027\u52a0\u8f7d\u6574\u4e2a\u6587\u4ef6\u3002<\/p>\n<p><strong>\u5982\u4f55\u8bfb\u53d6\u7279\u5b9a\u5b57\u8282\u8303\u56f4\u7684\u6570\u636e\uff1f<\/strong><br \/>\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528<code>seek()<\/code>\u548c<code>read()<\/code>\u65b9\u6cd5\u6765\u8bfb\u53d6\u6587\u4ef6\u7684\u7279\u5b9a\u5b57\u8282\u3002\u4f8b\u5982\uff1a  <\/p>\n<pre><code class=\"language-python\">with open(&#39;example.txt&#39;, &#39;rb&#39;) as file:\n    file.seek(start_byte)  # \u8df3\u8f6c\u5230\u6307\u5b9a\u5b57\u8282\u4f4d\u7f6e\n    data = file.read(byte_count)  # \u8bfb\u53d6\u6307\u5b9a\u5b57\u8282\u6570\n<\/code><\/pre>\n<p>\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u4e8c\u8fdb\u5236\u6587\u4ef6\u6216\u9700\u8981\u7cbe\u786e\u63a7\u5236\u8bfb\u53d6\u4f4d\u7f6e\u7684\u60c5\u51b5\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u8981\u4f7f\u7528Python\u8bfb\u53d6\u6587\u4ef6\u7684\u4e00\u90e8\u5206\u6570\u636e\uff0c\u4e3b\u8981\u6709\u4ee5\u4e0b\u51e0\u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528readlines()\u65b9\u6cd5\u3001\u5229\u7528seek()\u51fd [&hellip;]","protected":false},"author":3,"featured_media":1145772,"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\/1145761"}],"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=1145761"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1145761\/revisions"}],"predecessor-version":[{"id":1145775,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1145761\/revisions\/1145775"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1145772"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1145761"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1145761"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1145761"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}