{"id":8208,"date":"2024-03-14T07:42:19","date_gmt":"2024-03-14T07:42:19","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-read-a-file-in-chunks-in-python\/"},"modified":"2025-08-03T01:54:43","modified_gmt":"2025-08-03T01:54:43","slug":"how-to-read-a-file-in-chunks-in-python","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-read-a-file-in-chunks-in-python\/","title":{"rendered":"Python File Reading in Chunks: Complete Guide"},"content":{"rendered":"<p>You can chunk read a file in Python using the following methods:<\/p>\n<ol>\n<li>unlocked<\/li>\n<li>Get the size of something by reading it.<\/li>\n<li>Process or save the read data blocks in a loop.<\/li>\n<li>terminate()<\/li>\n<\/ol>\n<p>Here is an example code that demonstrates how to read a file in chunks and write the data to a new file:<\/p>\n<pre class=\"post-pre\"><code>chunk_size = <span class=\"hljs-number\">1024<\/span>  <span class=\"hljs-comment\"># \u6307\u5b9a\u6570\u636e\u5757\u7684\u5927\u5c0f<\/span>\r\n\r\n<span class=\"hljs-keyword\">with<\/span> <span class=\"hljs-built_in\">open<\/span>(<span class=\"hljs-string\">'input_file.txt'<\/span>, <span class=\"hljs-string\">'rb'<\/span>) <span class=\"hljs-keyword\">as<\/span> input_file, <span class=\"hljs-built_in\">open<\/span>(<span class=\"hljs-string\">'output_file.txt'<\/span>, <span class=\"hljs-string\">'wb'<\/span>) <span class=\"hljs-keyword\">as<\/span> output_file:\r\n    <span class=\"hljs-keyword\">while<\/span> <span class=\"hljs-literal\">True<\/span>:\r\n        data = input_file.read(chunk_size)  <span class=\"hljs-comment\"># \u8bfb\u53d6\u6570\u636e\u5757<\/span>\r\n        <span class=\"hljs-keyword\">if<\/span> <span class=\"hljs-keyword\">not<\/span> data:\r\n            <span class=\"hljs-keyword\">break<\/span>  <span class=\"hljs-comment\"># \u5982\u679c\u6ca1\u6709\u6570\u636e\u4e86\uff0c\u7ed3\u675f\u5faa\u73af<\/span>\r\n        output_file.write(data)  <span class=\"hljs-comment\"># \u5199\u5165\u6570\u636e\u5757\u5230\u8f93\u51fa\u6587\u4ef6<\/span>\r\n\r\n<span class=\"hljs-built_in\">print<\/span>(<span class=\"hljs-string\">\"\u6587\u4ef6\u5206\u5757\u8bfb\u53d6\u5b8c\u6210\"<\/span>)\r\n<\/code><\/pre>\n<p>In the code above, we open an input file input_file.txt and an output file output_file.txt. Then, within a loop, we use the read() method to read data chunks and write them to the output file. Finally, we close the file objects and print a message.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>You can chunk read a file in Python using the following methods: unlocked Get the size of something by reading it. Process or save the read data blocks in a loop. terminate() Here is an example code that demonstrates how to read a file in chunks and write the data to a new file: chunk_size [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[10894,10895,10896,10897,10893],"class_list":["post-8208","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-chunk-reading","tag-file-processing","tag-large-files","tag-memory-efficiency","tag-python-file-reading"],"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>Python File Reading in Chunks: Complete Guide - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to efficiently read large files in chunks using Python. Step-by-step tutorial with code examples for memory-efficient file processing.\" \/>\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\/blog\/how-to-read-a-file-in-chunks-in-python\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python File Reading in Chunks: Complete Guide\" \/>\n<meta property=\"og:description\" content=\"Learn how to efficiently read large files in chunks using Python. 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