{"id":9730,"date":"2021-06-18T16:49:50","date_gmt":"2021-06-18T11:19:50","guid":{"rendered":"https:\/\/pynative.com\/?p=9730"},"modified":"2021-07-03T12:04:53","modified_gmt":"2021-07-03T06:34:53","slug":"python-delete-lines-from-file","status":"publish","type":"post","link":"https:\/\/pynative.com\/python-delete-lines-from-file\/","title":{"rendered":"Delete Lines From a File in Python"},"content":{"rendered":"\n<p>This article lets you know how to delete specific lines from a file in Python. For example, you want to delete lines #5 and #12. <\/p>\n\n\n\n<p><strong>After reading this article, you&#8217;ll learn<\/strong>:<\/p>\n\n\n\n<ul><li>How to remove specific lines from a file by line numbers<\/li><li>How to delete lines that match or contain the given text\/string<\/li><li>How to delete the first and last line from a text file.<\/li><\/ul>\n\n\n\n<div class=\"wp-block-yoast-seo-table-of-contents yoast-table-of-contents\"><h2>Table of contents<\/h2><ul><li><a href=\"#h-delete-lines-from-a-file-by-line-numbers\" data-level=\"2\">Delete Lines from a File by Line Numbers<\/a><ul><li><a href=\"#h-using-seek-method\" data-level=\"3\">Using seek() method<\/a><\/li><\/ul><\/li><li><a href=\"#h-delete-first-and-last-line-of-a-file\" data-level=\"2\">Delete First and Last Line of a File<\/a><\/li><li><a href=\"#h-deleting-lines-matching-a-text-string\" data-level=\"2\">Deleting Lines Matching a text (string)<\/a><\/li><li><a href=\"#h-remove-lines-that-contains-a-specific-word\" data-level=\"2\">Remove Lines that Contains a Specific Word<\/a><\/li><li><a href=\"#h-remove-lines-starting-with-specific-word-string\" data-level=\"2\">Remove Lines Starting with Specific Word\/String<\/a><\/li><li><a href=\"#h-delete-specific-text-from-a-text-file\" data-level=\"2\">Delete Specific Text from a Text File<\/a><\/li><li><a href=\"#h-delete-all-lines-from-a-file\" data-level=\"2\">Delete all Lines From a File<\/a><\/li><\/ul><\/div>\n\n\n\n<h2 class=\"stepsh wp-block-heading\" id=\"h-delete-lines-from-a-file-by-line-numbers\">Delete Lines from a File by Line Numbers<\/h2>\n\n\n\n<p>Please follow the below steps to delete specific lines from a text file by line number: &#8211;<\/p>\n\n\n\n<ol><li><a href=\"https:\/\/pynative.com\/python-file-open\/\">Open file<\/a> in a read mode<\/li><li><a href=\"https:\/\/pynative.com\/python-read-file\/\">Read a file<\/a>. Read all contents from a file into a list using a <code>readlines()<\/code> method. here each element of a list is a line from the file<\/li><li>Close a file<\/li><li>Again, open the same file in write mode.<\/li><li>Iterate all lines from a <a href=\"https:\/\/pynative.com\/python-lists\/\">list<\/a> using a <a href=\"https:\/\/pynative.com\/python-for-loop\/\">for loop<\/a> and <a href=\"https:\/\/docs.python.org\/3\/library\/functions.html#enumerate\" target=\"_blank\" rel=\"noreferrer noopener\">enumerate()<\/a> function. The <code>enumerate()<\/code> function adds a counter to an iterable (such as list, string) and returns it in enumerate object. We used the enumerate object with a for loop to access the line number<\/li><li>Use the <a href=\"https:\/\/pynative.com\/python-control-flow-statements\/#h-if-statement-in-python\">if condition<\/a> in each iteration of a loop to check the line number. If it matches the line number to delete, then don&#8217;t write that line into the file.<\/li><li>Close a file<\/li><\/ol>\n\n\n\n<p><strong>Example<\/strong>:<\/p>\n\n\n\n<p>The following code shows&nbsp;<strong>how to delete lines from a text file by line number&nbsp;<\/strong>in Python. See the attached file used in the example and an image to show the file\u2019s content for reference.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"450\" height=\"257\" src=\"https:\/\/pynative.com\/wp-content\/uploads\/2021\/06\/sample_text_file-1.png\" alt=\"Sample text file\" class=\"wp-image-9615\" srcset=\"https:\/\/pynative.com\/wp-content\/uploads\/2021\/06\/sample_text_file-1.png 450w, https:\/\/pynative.com\/wp-content\/uploads\/2021\/06\/sample_text_file-1-300x171.png 300w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><figcaption>text file<\/figcaption><\/figure><\/div>\n\n\n\n<p>In this example, we are&nbsp;<strong>deleting lines 5 and 8. <\/strong><\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code1\"  id=\"norun\" class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-comment\"># list to store file lines<\/span>\nlines = &#91;]\n<span class=\"hljs-comment\"># read file<\/span>\n<span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">r\"E:\\demos\\files\\sample.txt\"<\/span>, <span class=\"hljs-string\">'r'<\/span>) <span class=\"hljs-keyword\">as<\/span> fp:\n    <span class=\"hljs-comment\"># read an store all lines into list<\/span>\n    lines = fp.readlines()\n\n<span class=\"hljs-comment\"># Write file<\/span>\n<span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">r\"E:\\demos\\files\\sample.txt\"<\/span>, <span class=\"hljs-string\">'w'<\/span>) <span class=\"hljs-keyword\">as<\/span> fp:\n    <span class=\"hljs-comment\"># iterate each line<\/span>\n    <span class=\"hljs-keyword\">for<\/span> number, line <span class=\"hljs-keyword\">in<\/span> enumerate(lines):\n        <span class=\"hljs-comment\"># delete line 5 and 8. or pass any Nth line you want to remove<\/span>\n        <span class=\"hljs-comment\"># note list index starts from 0<\/span>\n        <span class=\"hljs-keyword\">if<\/span> number <span class=\"hljs-keyword\">not<\/span> <span class=\"hljs-keyword\">in<\/span> &#91;<span class=\"hljs-number\">4<\/span>, <span class=\"hljs-number\">7<\/span>]:\n            fp.write(line)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><button class=\"hljs-copy-button\" onclick=\"copy_code('code1', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><\/div>\n\n\n<p>Our code deleted two lines. Here is a current data of a file<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">First line\nSecond line\nThird line\nFourth line\nSixth line\nSeventh line<\/pre>\n\n\n\n<p><strong>Note<\/strong>:<\/p>\n\n\n\n<p>The <code>enumerate()<\/code> function adds a counter to an iterable (such as list, string) and returns it in <code>enumerate<\/code> object.  We used the <code>enumerate<\/code> object with a <code>for<\/code> loop to access the line number. The <code>enumerate()<\/code> doesn\u2019t load the entire list in memory, so this is an efficient solution.<\/p>\n\n\n\n<p class=\"has-background\" style=\"background-color:#f4e0a8\"><strong>Note<\/strong>: Don&#8217;t use <code>del<\/code> keywords to delete lines from a list and write the same list to file. Because when you delete a line from the list, the item&#8217;s index gets changed. So you will no longer be able to delete the correct line.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-using-seek-method\">Using seek() method<\/h3>\n\n\n\n<p>The same can be accomplished using the <a href=\"https:\/\/pynative.com\/python-file-seek\/\">seek()<\/a> method by changing the pointer position so we<strong> don&#8217;t need to open a file twice<\/strong>. <\/p>\n\n\n\n<ul><li>Open file in the<a href=\"https:\/\/pynative.com\/python-read-file\/#h-reading-and-writing-to-the-same-file\"> <strong>read and write mode<\/strong><\/a> (<code>r+<\/code>)<\/li><li>Read all lines from a file into the list<\/li><li>Move the file <strong>pointer to the start<\/strong> of a file using <code>seek()<\/code> method<\/li><li>Truncate the file using the <code>truncate()<\/code> method<\/li><li>Iterate list using loop and <code>enumerate()<\/code> function<\/li><li>In each iteration write the current line to file. Skip those line numbers which you want to remove<\/li><\/ul>\n\n\n\n<p><strong>Example<\/strong>:<\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code2\"  id=\"norun\" class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">r\"E:\\demos\\files\\sample.txt\"<\/span>, <span class=\"hljs-string\">'r+'<\/span>) <span class=\"hljs-keyword\">as<\/span> fp:\n    <span class=\"hljs-comment\"># read an store all lines into list<\/span>\n    lines = fp.readlines()\n    <span class=\"hljs-comment\"># move file pointer to the beginning of a file<\/span>\n    fp.seek(<span class=\"hljs-number\">0<\/span>)\n    <span class=\"hljs-comment\"># truncate the file<\/span>\n    fp.truncate()\n\n    <span class=\"hljs-comment\"># start writing lines<\/span>\n    <span class=\"hljs-comment\"># iterate line and line number<\/span>\n    <span class=\"hljs-keyword\">for<\/span> number, line <span class=\"hljs-keyword\">in<\/span> enumerate(lines):\n        <span class=\"hljs-comment\"># delete line number 5 and 8<\/span>\n        <span class=\"hljs-comment\"># note: list index start from 0<\/span>\n        <span class=\"hljs-keyword\">if<\/span> number <span class=\"hljs-keyword\">not<\/span> <span class=\"hljs-keyword\">in<\/span> &#91;<span class=\"hljs-number\">4<\/span>, <span class=\"hljs-number\">7<\/span>]:\n            fp.write(line)\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><button class=\"hljs-copy-button\" onclick=\"copy_code('code2', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-delete-first-and-last-line-of-a-file\">Delete First and Last Line of a File<\/h2>\n\n\n\n<p>To selectively delete certain content from the file, we need to copy the file&#8217;s contents except for those lines we want to remove and write the remaining lines again to the same file.<\/p>\n\n\n\n<p><strong>Use the below steps to delete the first line from a file<\/strong>.<\/p>\n\n\n\n<ul><li>Open file in a read and write mode (<code>r+<\/code>)<\/li><li>Read all lines from a file<\/li><li>Move file pointer at the start of a file using the <code>seek()<\/code> method<\/li><li>Truncate the file<\/li><li>Write all lines from a file except the first line.<\/li><\/ul>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code3\"  id=\"norun\" class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">r\"E:\\demos\\files\\sample.txt\"<\/span>, <span class=\"hljs-string\">'r+'<\/span>) <span class=\"hljs-keyword\">as<\/span> fp:\n    <span class=\"hljs-comment\"># read an store all lines into list<\/span>\n    lines = fp.readlines()\n    <span class=\"hljs-comment\"># move file pointer to the beginning of a file<\/span>\n    fp.seek(<span class=\"hljs-number\">0<\/span>)\n    <span class=\"hljs-comment\"># truncate the file<\/span>\n    fp.truncate()\n\n    <span class=\"hljs-comment\"># start writing lines except the first line<\/span>\n    <span class=\"hljs-comment\"># lines&#91;1:] from line 2 to last line<\/span>\n    fp.writelines(lines&#91;<span class=\"hljs-number\">1<\/span>:])\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><button class=\"hljs-copy-button\" onclick=\"copy_code('code3', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><\/div>\n\n\n<p><strong>Output<\/strong><\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-1 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p>Before deleting the first line<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">First line\nSecond line\nThird line\nFourth line\nSixth line\nSeventh line<\/pre>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p>After deleting the first line<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Second line\nThird line\nFourth line\nSixth line\nSeventh line<\/pre>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-2 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p><strong>To delete the first N lines use list slicing<\/strong>.<\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code4\"  id=\"norun\" class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-comment\"># lines&#91;N:] to delete first 5 lines<\/span>\nfp.writelines(lines&#91;<span class=\"hljs-number\">4<\/span>:])<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><button class=\"hljs-copy-button\" onclick=\"copy_code('code4', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><\/div>\n\n\n<p>If you are reading a file and don&#8217;t want to read the first line use the below approach instead of deleting a line from a file.<\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code5\"  id=\"norun\" class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-comment\"># read from second line<\/span>\nlines = fp.readlines()&#91;<span class=\"hljs-number\">1<\/span>:]<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><button class=\"hljs-copy-button\" onclick=\"copy_code('code5', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><\/div><\/div>\n<\/div>\n\n\n\n<p>Use the below example to steps to delete the last line from a file<\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code6\"  id=\"norun\" class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">r\"E:\\demos\\files\\sample.txt\"<\/span>, <span class=\"hljs-string\">'r+'<\/span>) <span class=\"hljs-keyword\">as<\/span> fp:\n    <span class=\"hljs-comment\"># read an store all lines into list<\/span>\n    lines = fp.readlines()\n    <span class=\"hljs-comment\"># move file pointer to the beginning of a file<\/span>\n    fp.seek(<span class=\"hljs-number\">0<\/span>)\n    <span class=\"hljs-comment\"># truncate the file<\/span>\n    fp.truncate()\n\n    <span class=\"hljs-comment\"># start writing lines except the last line<\/span>\n    <span class=\"hljs-comment\"># lines&#91;:-1] from line 0 to the second last line<\/span>\n    fp.writelines(lines&#91;:<span class=\"hljs-number\">-1<\/span>])\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><button class=\"hljs-copy-button\" onclick=\"copy_code('code6', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><\/div>\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-3 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p><strong>To delete last N lines use list slicing<\/strong>.<\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code7\"  id=\"norun\" class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-comment\"># lines&#91;:-N] to delete last N lines<\/span>\nfp.writelines(lines&#91;:<span class=\"hljs-number\">-4<\/span>])<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><button class=\"hljs-copy-button\" onclick=\"copy_code('code7', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><\/div><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-deleting-lines-matching-a-text-string\">Deleting Lines Matching a text (string)<\/h2>\n\n\n\n<p>Assume files contain hundreds of line and you wanted to remove lines which match the given string\/text.  Let&#8217;s see how to remove lines that match the given text (exact match).<\/p>\n\n\n\n<p><strong>Steps<\/strong>:<\/p>\n\n\n\n<ul><li>Read file into a list<\/li><li>Open the same file in write mode<\/li><li>Iterate a list and write each line into a file except those lines that match the given string.<\/li><\/ul>\n\n\n\n<p><strong>Example 1<\/strong>: Delete lines that match the given text (exact match)<\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code8\"  id=\"norun\" class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">\"sample.txt\"<\/span>, <span class=\"hljs-string\">\"r\"<\/span>) <span class=\"hljs-keyword\">as<\/span> fp:\n    lines = fp.readlines()\n\n<span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">\"sample.txt\"<\/span>, <span class=\"hljs-string\">\"w\"<\/span>) <span class=\"hljs-keyword\">as<\/span> fp:\n    <span class=\"hljs-keyword\">for<\/span> line <span class=\"hljs-keyword\">in<\/span> lines:\n        <span class=\"hljs-keyword\">if<\/span> line.strip(<span class=\"hljs-string\">\"\\n\"<\/span>) != <span class=\"hljs-string\">\"text to delete\"<\/span>:\n            fp.write(line)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><button class=\"hljs-copy-button\" onclick=\"copy_code('code8', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><\/div>\n\n\n<p>Also, you can achieve it using the <strong>single loop<\/strong> so it will be much <strong>faster<\/strong>.<\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code9\"  id=\"norun\" class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-9\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-keyword\">import<\/span> os\n\n<span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">\"sample.txt\"<\/span>, <span class=\"hljs-string\">\"r\"<\/span>) <span class=\"hljs-keyword\">as<\/span> input:\n    <span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">\"temp.txt\"<\/span>, <span class=\"hljs-string\">\"w\"<\/span>) <span class=\"hljs-keyword\">as<\/span> output:\n        <span class=\"hljs-comment\"># iterate all lines from file<\/span>\n        <span class=\"hljs-keyword\">for<\/span> line <span class=\"hljs-keyword\">in<\/span> input:\n            <span class=\"hljs-comment\"># if text matches then don't write it<\/span>\n            <span class=\"hljs-keyword\">if<\/span> line.strip(<span class=\"hljs-string\">\"\\n\"<\/span>) != <span class=\"hljs-string\">\"text to delete\"<\/span>:\n                output.write(line)\n\n<span class=\"hljs-comment\"># replace file with original name<\/span>\nos.replace(<span class=\"hljs-string\">'temp.txt'<\/span>, <span class=\"hljs-string\">'sample.txt'<\/span>)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><button class=\"hljs-copy-button\" onclick=\"copy_code('code9', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-remove-lines-that-contains-a-specific-word\">Remove Lines that Contains a Specific Word<\/h2>\n\n\n\n<p>We may have to delete lines from a file that contains a particular keyword or tag in some cases. Let&#8217;s see the example to remove lines from file that contain a specific string anywhere in the line.<\/p>\n\n\n\n<p><strong>Example<\/strong>:<\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code10\"  id=\"norun\" class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-keyword\">import<\/span> os\n\n<span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">\"sample.txt\"<\/span>, <span class=\"hljs-string\">\"r\"<\/span>) <span class=\"hljs-keyword\">as<\/span> input:\n    <span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">\"temp.txt\"<\/span>, <span class=\"hljs-string\">\"w\"<\/span>) <span class=\"hljs-keyword\">as<\/span> output:\n        <span class=\"hljs-comment\"># iterate all lines from file<\/span>\n        <span class=\"hljs-keyword\">for<\/span> line <span class=\"hljs-keyword\">in<\/span> input:\n            <span class=\"hljs-comment\"># if substring contain in a line then don't write it<\/span>\n            <span class=\"hljs-keyword\">if<\/span> <span class=\"hljs-string\">\"word\"<\/span> <span class=\"hljs-keyword\">not<\/span> <span class=\"hljs-keyword\">in<\/span> line.strip(<span class=\"hljs-string\">\"\\n\"<\/span>):\n                output.write(line)\n\n<span class=\"hljs-comment\"># replace file with original name<\/span>\nos.replace(<span class=\"hljs-string\">'temp.txt'<\/span>, <span class=\"hljs-string\">'sample.txt'<\/span>)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><button class=\"hljs-copy-button\" onclick=\"copy_code('code10', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-remove-lines-starting-with-specific-word-string\">Remove Lines Starting with Specific Word\/String<\/h2>\n\n\n\n<p>Learn how to remove lines from a file starting with a specific word. In the following example, we will delete lines that begin with the word &#8216;<strong>time<\/strong>&#8216;.<\/p>\n\n\n\n<p><strong>Example<\/strong>:<\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code11\"  id=\"norun\" class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-11\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-keyword\">import<\/span> os\n\n<span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">\"sample.txt\"<\/span>, <span class=\"hljs-string\">\"r\"<\/span>) <span class=\"hljs-keyword\">as<\/span> input:\n    <span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">\"temp.txt\"<\/span>, <span class=\"hljs-string\">\"w\"<\/span>) <span class=\"hljs-keyword\">as<\/span> output:\n        <span class=\"hljs-comment\"># iterate all lines from file<\/span>\n        <span class=\"hljs-keyword\">for<\/span> line <span class=\"hljs-keyword\">in<\/span> input:\n            <span class=\"hljs-comment\"># if line starts with substring 'time' then don't write it in temp file<\/span>\n            <span class=\"hljs-keyword\">if<\/span> <span class=\"hljs-keyword\">not<\/span> line.strip(<span class=\"hljs-string\">\"\\n\"<\/span>).startswith(<span class=\"hljs-string\">'time'<\/span>):\n                output.write(line)\n\n<span class=\"hljs-comment\"># replace file with original name<\/span>\nos.replace(<span class=\"hljs-string\">'temp.txt'<\/span>, <span class=\"hljs-string\">'sample3.txt'<\/span>)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-11\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><button class=\"hljs-copy-button\" onclick=\"copy_code('code11', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-delete-specific-text-from-a-text-file\">Delete Specific Text from a Text File<\/h2>\n\n\n\n<p>It can also be the case that you wanted to delete a specific string from a file but not the line which contains it. Let&#8217;s see the example of the same<\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code12\"  id=\"norun\" class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-12\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-keyword\">import<\/span> os\n\noriginal_file = <span class=\"hljs-string\">\"sample3.txt\"<\/span>\ntemp_file = <span class=\"hljs-string\">\"temp.txt\"<\/span>\n\nstring_to_delete = &#91;<span class=\"hljs-string\">'Emma'<\/span>, <span class=\"hljs-string\">'Kelly'<\/span>]\n<span class=\"hljs-keyword\">with<\/span> open(original_file, <span class=\"hljs-string\">\"r\"<\/span>) <span class=\"hljs-keyword\">as<\/span> input:\n    <span class=\"hljs-keyword\">with<\/span> open(temp_file, <span class=\"hljs-string\">\"w\"<\/span>) <span class=\"hljs-keyword\">as<\/span> output:\n        <span class=\"hljs-keyword\">for<\/span> line <span class=\"hljs-keyword\">in<\/span> input:\n            <span class=\"hljs-keyword\">for<\/span> word <span class=\"hljs-keyword\">in<\/span> string_to_delete:\n                line = line.replace(word, <span class=\"hljs-string\">\"\"<\/span>)\n            output.write(line)\n\n<span class=\"hljs-comment\"># replace file with original name<\/span>\nos.replace(<span class=\"hljs-string\">'temp.txt'<\/span>, <span class=\"hljs-string\">'sample3.txt'<\/span>)\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><button class=\"hljs-copy-button\" onclick=\"copy_code('code12', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"h-delete-all-lines-from-a-file\">Delete all Lines From a File<\/h2>\n\n\n\n<p>To delete all the lines in a file and empty the file, we can use the truncate() method on the file object. The truncate() method removes all lines from a file and sets the file pointer to the beginning of the file.<\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code13\"  id=\"norun\" class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-13\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">\"sample3.txt\"<\/span>, <span class=\"hljs-string\">\"r\"<\/span>) <span class=\"hljs-keyword\">as<\/span> fp:\n    fp.truncate()<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-13\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre><button class=\"hljs-copy-button\" onclick=\"copy_code('code13', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><\/div>","protected":false},"excerpt":{"rendered":"<p>This article lets you know how to delete specific lines from a file in Python. For example, you want to delete lines #5 and #12. After reading this article, you&#8217;ll learn: How to remove specific lines from a file by line numbers How to delete lines that match or contain the given text\/string How to [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":9732,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[22,33],"tags":[34],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.6 (Yoast SEO v22.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Python Delete Lines From a File [4 Ways] &#8211; PYnative<\/title>\n<meta name=\"description\" content=\"Learn How to remove lines from a file by line numbers. 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Remove lines that match the specific text. 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