{"id":9554,"date":"2021-06-13T17:48:54","date_gmt":"2021-06-13T12:18:54","guid":{"rendered":"https:\/\/pynative.com\/?p=9554"},"modified":"2021-12-30T17:51:04","modified_gmt":"2021-12-30T12:21:04","slug":"python-write-file","status":"publish","type":"post","link":"https:\/\/pynative.com\/python-write-file\/","title":{"rendered":"Python Write to File"},"content":{"rendered":"\n<p>It is pretty standard that large chunks of data need to store in the Files. Python is widely used in data analytics and comes with some inbuilt functions to write data into files.<\/p>\n\n\n\n<p>We can open a file and do different operations on it, such as write new contents into it or modify a file for appending content at the end of a file.<\/p>\n\n\n\n<p><strong>After reading this tutorial, you&#8217;ll learn<\/strong>: \u2013<\/p>\n\n\n\n<ul><li>Writing into both text and binary files<\/li><li>The different modes for writing a file<\/li><li>Writing single or multiple lines in a file.<\/li><li>All methods for writing a file such as&nbsp;<code>write()<\/code> and <code>writeline()<\/code>.<\/li><li>Appending new contents at the end of an existing file<\/li><li>Open file for both reading and writing.<\/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-access-modes-for-writing-a-file\" data-level=\"2\">Access Modes for Writing a file<\/a><\/li><li><a href=\"#h-steps-for-writing-data-into-a-file-in-python\" data-level=\"2\">Steps for Writing Data into a File in Python<\/a><ul><li><a href=\"#h-example-write-to-a-text-file-in-python\" data-level=\"3\">Example: Write to a Text file in Python<\/a><\/li><li><a href=\"#h-writing-to-an-existing-file\" data-level=\"3\">Writing To An Existing File<\/a><\/li><\/ul><\/li><li><a href=\"#h-file-write-methods\" data-level=\"2\">File Write Methods<\/a><\/li><li><a href=\"#h-writelines-write-a-list-of-lines-to-a-file\" data-level=\"2\">writelines(): Write a list of lines to a file<\/a><\/li><li><a href=\"#h-with-statement-to-write-a-file\" data-level=\"2\">with Statement to Write a File<\/a><\/li><li><a href=\"#h-appending-new-content-to-an-existing-file\" data-level=\"2\">Appending New Content to an Existing File<\/a><\/li><li><a href=\"#h-append-and-read-on-the-same-file\" data-level=\"2\">Append and Read on the Same File<\/a><\/li><li><a href=\"#h-writing-to-a-binary-file\" data-level=\"2\">Writing to a Binary File<\/a><\/li><li><a href=\"#h-summary\" data-level=\"2\">Summary<\/a><\/li><\/ul><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-access-modes-for-writing-a-file\">Access Modes for Writing a file<\/h2>\n\n\n\n<p>Access mode specifying the<strong> purpose of opening a file<\/strong>.<\/p>\n\n\n\n<p>Whenever we need to write text into a file, we have to open the file in one of the specified access modes. We can open the file basically to read, write or append and sometimes to do multiple operations on a single file.<\/p>\n\n\n\n<p>To write the contents into a file, we have to open the file in write mode. <a href=\"https:\/\/pynative.com\/python-file-open\/\">Open a file<\/a> using the built-in function called <code>open()<\/code>. This function takes two parameters, namely filename, and access mode, and returns the file pointer.<\/p>\n\n\n\n<p>We can open a file for modifying or overwrite its contents by using any one of the modes described in the following table.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Access Mode<\/th><th>Description<\/th><\/tr><\/thead><tbody><tr><td><code>w<\/code><\/td><td>Open a file for writing. In the case of an existing file, it truncates the existing content and places the filehandle at the beginning of the file. A new file is created if the mentioned file doesn&#8217;t exist.<\/td><\/tr><tr><td><code>w+<\/code><\/td><td>Open a file for both reading and writing. In the case of the existing file, it will truncate the entire content and place the filehandle at the beginning of the file.<\/td><\/tr><tr><td><code>wb<\/code><\/td><td>Open a binary file for writing. The FileHandle is placed at the beginning of the file, and existing content will be truncated. A new file is created otherwise.<\/td><\/tr><tr><td><code>a<\/code><\/td><td>Opens a file for writing. The FileHandle will be placed at the end of the file. In the case of the existing file, the new content will be added after the existing content. A new file will be created otherwise.<\/td><\/tr><tr><td><code>a+<\/code><\/td><td>Open a file for appending as well as reading. The FileHandle is placed at the end of the file. In the case of the existing file, the new content will get added after the existing content. A new file is created otherwise.<\/td><\/tr><\/tbody><\/table><figcaption>Python file write modes<\/figcaption><\/figure>\n\n\n\n<h2 class=\"stepsh wp-block-heading\" id=\"h-steps-for-writing-data-into-a-file-in-python\">Steps for Writing Data into a File in Python<\/h2>\n\n\n\n<div class=\"wp-block-columns steps 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<div class=\"schema-how-to wp-block-yoast-how-to-block\"><p class=\"schema-how-to-description\">To write into a file, Please follow these steps:<\/p> <ol class=\"schema-how-to-steps\"><li class=\"schema-how-to-step\" id=\"how-to-step-1623071602523\"><strong class=\"schema-how-to-step-name\">Find the path of a file<\/strong> <p class=\"schema-how-to-step-text\">We can read a file using both relative path and absolute path. The path is the location of the file on the disk.<br\/>An <strong>absolute path<\/strong> contains the complete directory list required to locate the file.<br\/>A <strong>relative path<\/strong> contains the current directory and then the file name.<\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-1623072196137\"><strong class=\"schema-how-to-step-name\">Open file in write mode<\/strong> <p class=\"schema-how-to-step-text\">Pass file path and access mode <code>w<\/code> to the <code>open()<\/code> function. The access mode opens a file in write mode.<br\/>For example, <code>fp= open(r'File_Path', 'w')<\/code><\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-1623072253286\"><strong class=\"schema-how-to-step-name\">Write content into the file<\/strong> <p class=\"schema-how-to-step-text\">Once a file is opened in the <code>write<\/code> mode, write text or content into the file using the write() method.<br\/>For example, <code>fp.write('new text')<\/code>.<br\/>The <code>write()<\/code> method will add new text at the beginning of a file. For an existing file, this new content will replace the existing content. If the file is not already present a new file will be created, and content is written into it.<\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-1623073790009\"><strong class=\"schema-how-to-step-name\">Close file after completing the write operation<\/strong> <p class=\"schema-how-to-step-text\">We need to make sure that the file will be closed properly after completing the file operation. Use <code>fp.close()<\/code> to close a file.<\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-1623232271323\"><strong class=\"schema-how-to-step-name\">Append content at the end of the file<\/strong> <p class=\"schema-how-to-step-text\">Pass file path and access mode <code>a<\/code> to the <code>open()<\/code> function to open a file in append mode.<br\/>For example, <code>fp= open(r'File_Path', 'a')<\/code><br\/>Next, use the <code>write()<\/code> method to write content at the end of the file without deleting the existing content<\/p> <\/li><\/ol><\/div>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-example-write-to-a-text-file-in-python\">Example: Write to a Text file in Python<\/h3>\n\n\n\n<p>The following code shows how to write a string into a new file. In this example, we are writing a single line into a file.<\/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\">text = <span class=\"hljs-string\">\"This is new content\"<\/span>\n<span class=\"hljs-comment\"># writing new content to the file<\/span>\nfp = open(<span class=\"hljs-string\">\"write_demo.txt\"<\/span>, <span class=\"hljs-string\">'w'<\/span>)\nfp.write(text)\nprint(<span class=\"hljs-string\">'Done Writing'<\/span>)\nfp.close()\n\n<span class=\"hljs-comment\"># Open the file for reading the new contents<\/span>\nfp = open(<span class=\"hljs-string\">\"write_demo.txt\"<\/span>, <span class=\"hljs-string\">'r'<\/span>)\nprint(fp.read())\nfp.close()<\/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<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<pre class=\"wp-block-preformatted\">Done Writing\nThis is new content<\/pre>\n\n\n\n<p>In the above example, the write_demo.txt was not present, and therefore a new file is created with that name. here we used a relative path. The content is written at the beginning.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"349\" height=\"299\" src=\"https:\/\/pynative.com\/wp-content\/uploads\/2021\/06\/text_file_after_writing.png\" alt=\"File after writing a text in it\" class=\"wp-image-9597\" srcset=\"https:\/\/pynative.com\/wp-content\/uploads\/2021\/06\/text_file_after_writing.png 349w, https:\/\/pynative.com\/wp-content\/uploads\/2021\/06\/text_file_after_writing-300x257.png 300w\" sizes=\"(max-width: 349px) 100vw, 349px\" \/><figcaption>File after writing a text in it<\/figcaption><\/figure><\/div>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns notecolumn has-background is-layout-flex wp-container-core-columns-is-layout-3 wp-block-columns-is-layout-flex\" style=\"background-color:#c9e8f5\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p><strong>Note<\/strong>: A new file is created in the directory where this Python script is present. Use the absolute path If you want to create and write a file in some other directory.<\/p>\n\n\n\n<p>An absolute path contains the entire path to the file or directory that we need to access. It includes the complete directory list required to locate the file.<\/p>\n\n\n\n<p>For example, <code>E:\\PYnative\\files_demos\\write_demo.txt<\/code> is an absolute path to discover the write_demo.txt<\/p>\n\n\n\n<p><strong>Example<\/strong>:<\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code2\"  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\">fp = open(<span class=\"hljs-string\">r\"E:\\demos\\files\\write_demo.txt\"<\/span>, <span class=\"hljs-string\">'w'<\/span>)\nfp.write(<span class=\"hljs-string\">'This is new content'<\/span>)\nfp.close()\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><button class=\"hljs-run-button\" onclick=\"run_code('code2');\"><i class=\"far fa-play-circle\" aria-hidden=\"true\"><\/i> Run<\/button><\/div><\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-writing-to-an-existing-file\">Writing To An Existing File<\/h3>\n\n\n\n<p>In an already existing file, while opening the file in the write mode, the existing content will be overwritten. The filehandle will be placed at the beginning of the file.<\/p>\n\n\n\n<p>In the below example, we are <a href=\"https:\/\/pynative.com\/python-read-file\/\">reading a file<\/a> to view the old contents. Next, we are opening a file in the write mode to write the new content. We can see that the existing content has been overwritten with the new content.<\/p>\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\">file_path = <span class=\"hljs-string\">r\"E:\\demos\\files\\write_demo.txt\"<\/span>\nfp = open(file_path, <span class=\"hljs-string\">'r'<\/span>)\nprint(fp.read())\nfp.close()\n\n<span class=\"hljs-comment\"># overwriting existing content of a file<\/span>\nfp = open(file_path, <span class=\"hljs-string\">'w'<\/span>)\nfp.write(<span class=\"hljs-string\">\"This is overwritten content\"<\/span>)\nfp.close()\n\n<span class=\"hljs-comment\"># Read file<\/span>\nfp = open(file_path, <span class=\"hljs-string\">'r'<\/span>)\nprint(<span class=\"hljs-string\">\"Opening file again..\"<\/span>)\nprint(fp.read())\nfp.close()<\/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<pre class=\"wp-block-preformatted\">This is new content\nOpening file again..\nThis is overwritten content<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-file-write-methods\">File Write Methods<\/h2>\n\n\n\n<p>Python provides two different methods to write into a file. We don\u2019t have to import any module for that.. Below are the methods.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Method<\/th><th>Description<\/th><\/tr><\/thead><tbody><tr><td><code>write()<\/code><\/td><td>Use to write a string into a file. It only accepts a string as the argument. Else it will raise a <code>TypeError: write() argument must be str<\/code>.<\/td><\/tr><tr><td><code>writelines()<\/code><\/td><td>Use to write a list of strings into a file. It accepts both string and list as the argument.<\/td><\/tr><\/tbody><\/table><figcaption>file write methods<\/figcaption><\/figure>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<h2 class=\"wp-block-heading\" id=\"h-writelines-write-a-list-of-lines-to-a-file\"><code>writelines()<\/code>: Write a list of lines to a file<\/h2>\n\n\n\n<p>We can write multiple lines at once using the <code>writelines()<\/code> method. We can pass a <a href=\"https:\/\/pynative.com\/python-lists\/\">list<\/a> of strings that we want to add to the file to it. Use this method when you wanted to <a href=\"https:\/\/pynative.com\/python-write-list-to-file\/\">write a list into a file<\/a>.<\/p>\n\n\n<pre id=\"syntax\" 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\">lines = &#91;str1, str2, str3]\nfile_obj.writelines(lines)<\/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>\n\n\n<p>The above syntax explains that the list of strings will be added to the file accessed with the <code>file_obj<\/code>.<\/p>\n\n\n\n<p><strong>Example<\/strong>:<\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code4\"  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\">person_data = &#91;<span class=\"hljs-string\">'Name: Emma'<\/span>, <span class=\"hljs-string\">'\\nAddress: 221 Baker Street'<\/span>, <span class=\"hljs-string\">'\\nCity: London'<\/span>]\n<span class=\"hljs-comment\"># writing string and list of lines to a file<\/span>\nfp = open(<span class=\"hljs-string\">\"write_demo.txt\"<\/span>, <span class=\"hljs-string\">\"w\"<\/span>)\nfp.writelines(person_data)\nfp.close()\n\n<span class=\"hljs-comment\"># opening the file in read mode<\/span>\nfp = open(<span class=\"hljs-string\">\"write_demo.txt\"<\/span>, <span class=\"hljs-string\">\"r\"<\/span>)\nprint(fp.read())\nfp.close()<\/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('code4', 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-4 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<pre class=\"wp-block-preformatted\">Name: Emma\nAddress: 221 Baker Street\nCity: London<\/pre>\n\n\n\n<p>In the above example we have seen that a list of strings have been added to the file. We have added &#8216;\\n&#8217; at the start of each string to write each string on a newline.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"394\" height=\"283\" src=\"https:\/\/pynative.com\/wp-content\/uploads\/2021\/06\/text_file_after_writing_list.png\" alt=\"File after writing list into it\" class=\"wp-image-9598\" srcset=\"https:\/\/pynative.com\/wp-content\/uploads\/2021\/06\/text_file_after_writing_list.png 394w, https:\/\/pynative.com\/wp-content\/uploads\/2021\/06\/text_file_after_writing_list-300x215.png 300w\" sizes=\"(max-width: 394px) 100vw, 394px\" \/><figcaption>File after writing list into it<\/figcaption><\/figure><\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-with-statement-to-write-a-file\"><code>with<\/code> Statement to Write a File<\/h2>\n\n\n\n<p>We can open a file by using the <a href=\"https:\/\/www.python.org\/dev\/peps\/pep-0343\/\">with statement<\/a> along with <code>open()<\/code> function. The general syntax is as follows.<\/p>\n\n\n<pre id=\"syntax\" 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(__file__, accessmode) <span class=\"hljs-keyword\">as<\/span> f:<\/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>\n\n\n<p>The following are the main advantages of opening a file using &#8216;with&#8217; statement<\/p>\n\n\n\n<ul><li>The with statement simplifies exception handling by encapsulating common preparation and cleanup tasks.<\/li><li>This also ensures that a file is automatically closed after leaving the block.<\/li><li>As the file is closed automatically it ensures that all the resources that are tied up with the file are released. <\/li><\/ul>\n\n\n\n<p>Let us see with an example how we can use this to open a file for writing.<\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code5\"  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\">name = <span class=\"hljs-string\">\"Written using a context manager\"<\/span>\n<span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">\"Write_demo.txt\"<\/span>, <span class=\"hljs-string\">\"w\"<\/span>) <span class=\"hljs-keyword\">as<\/span> f:\n    f.write(name)\n\n<span class=\"hljs-comment\"># opening the file in read mode to access the file<\/span>\n<span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">\"Write_demo.txt\"<\/span>, <span class=\"hljs-string\">\"r\"<\/span>) <span class=\"hljs-keyword\">as<\/span> f:\n    print(f.read())<\/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('code5', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><\/div>\n\n\n<p><strong>Output<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Written using a context manager<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-appending-new-content-to-an-existing-file\">Appending New Content to an Existing File<\/h2>\n\n\n\n<p>With the <strong>access mode set to <code>a<\/code><\/strong>, the open function will place filehandle at the end of the file, and then we can add new text at the end of the existing file using the <code>write()<\/code> and <code>writelines()<\/code> functions.<\/p>\n\n\n\n<p>Now let us add some content to the already created &#8216;Write_demo.txt&#8217; .<\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code6\"  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\">name = <span class=\"hljs-string\">'\\nEmma'<\/span>\naddress = &#91;<span class=\"hljs-string\">'\\nAddress: 221 Baker Street'<\/span>, <span class=\"hljs-string\">'\\nCity: London'<\/span>, <span class=\"hljs-string\">'\\nCountry:United Kingdom'<\/span>]\n<span class=\"hljs-comment\"># append to file<\/span>\n<span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">\"Write_demo.txt\"<\/span>, <span class=\"hljs-string\">\"a\"<\/span>) <span class=\"hljs-keyword\">as<\/span> f:\n    f.write(name)\n    f.writelines(address)\n\n<span class=\"hljs-comment\"># opening the file in read mode to access the file<\/span>\n<span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">\"Write_demo.txt\"<\/span>, <span class=\"hljs-string\">\"r\"<\/span>) <span class=\"hljs-keyword\">as<\/span> f:\n    print(f.read())\n<\/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('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-5 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p><strong>Output<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Written using a context manager\nEmma\nAddress: 221 Baker Street\nCity: London\nCountry:United Kingdom<\/pre>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<div class=\"wp-block-image is-style-default\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"394\" height=\"320\" src=\"https:\/\/pynative.com\/wp-content\/uploads\/2021\/06\/file_after_appedning_text.png\" alt=\"File after appending text\" class=\"wp-image-9595\" srcset=\"https:\/\/pynative.com\/wp-content\/uploads\/2021\/06\/file_after_appedning_text.png 394w, https:\/\/pynative.com\/wp-content\/uploads\/2021\/06\/file_after_appedning_text-300x244.png 300w\" sizes=\"(max-width: 394px) 100vw, 394px\" \/><figcaption>File after appending text<\/figcaption><\/figure><\/div>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-append-and-read-on-the-same-file\">Append and Read on the Same File<\/h2>\n\n\n\n<p>In the above example, we have seen how our content got appended to the existing content in the end. We opened the file again to read the contents.  <\/p>\n\n\n\n<p>As you can see, we opened a file two times, one for appending and the second call for a reading.<\/p>\n\n\n\n<p>If we try to read without opening the file again we will get the <code>Unsupported operation exception<\/code> .<\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code7\"  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\">name2 = <span class=\"hljs-string\">\"Antony\\n\"<\/span>\naddress2 = &#91;<span class=\"hljs-string\">\"224 Baker Street\\n\"<\/span>, <span class=\"hljs-string\">\"London\\n\"<\/span>]\n\n<span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">\"Write_demo.txt\"<\/span>, <span class=\"hljs-string\">\"a\"<\/span>) <span class=\"hljs-keyword\">as<\/span> f:\n  f.write(name2)\n  f.writelines(address2)\n  print(f.read())<\/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('code7', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><\/div>\n\n\n<p><strong>Output<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">UnsupportedOperation: not readable<\/pre>\n\n\n\n<p class=\"has-background\" style=\"background-color:#c9e8f5\">It is possible to do both append and read operations together by using the access mode <code>a+<\/code>. where we can open a file and add the content and then read the modified file again. We can perform multiple operations on the same file by using the + sign and the access mode that we wish to perform.<\/p>\n\n\n\n<p><strong>Example: Append and Read<\/strong><\/p>\n\n\n\n<p>As mentioned above, the <code>write()<\/code> method moves the filehandle in the append mode at the end. If we try to read the file using the <code>read()<\/code> method, you&#8217;ll get an empty string. Use the <a href=\"https:\/\/pynative.com\/python-file-seek\/\">seek()<\/a> method on the <a href=\"https:\/\/pynative.com\/python-file-objects\/\">file object<\/a> and move the FileHandle to the beginning.<\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code8\"  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\">name = <span class=\"hljs-string\">'\\nAntony'<\/span>\naddress = &#91;<span class=\"hljs-string\">'\\nAddress: 221 Baker Street'<\/span>, <span class=\"hljs-string\">'\\nCity: London'<\/span>, <span class=\"hljs-string\">'\\nCountry:United Kingdom'<\/span>]\n<span class=\"hljs-comment\"># append to file<\/span>\n<span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">\"Write_demo.txt\"<\/span>, <span class=\"hljs-string\">\"a+\"<\/span>) <span class=\"hljs-keyword\">as<\/span> f:\n    f.write(name)\n    f.writelines(address)\n    <span class=\"hljs-comment\"># move file handle to the start<\/span>\n    f.seek(<span class=\"hljs-number\">0<\/span>)\n    print(f.read())<\/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('code8', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><\/div>\n\n\n<p><strong>Output<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Written using a context manager\nEmma\nAddress: 221 Baker Street\nCity: London\nCountry:United Kingdom\nAntony\nAddress: 221 Baker Street\nCity: London\nCountry:United Kingdom<\/pre>\n\n\n\n<p>If you want to perform both <strong>write and read<\/strong> then change the access mode to w+. It opens a file for both writings as well as reading. The file pointer will be placed at the beginning of the file. <strong>For an existing file, the content will be overwritten.<\/strong><\/p>\n\n\n\n<p><strong>Example<\/strong>:<\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code9\"  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-comment\"># Write and Read<\/span>\n<span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">\"Write_demo.txt\"<\/span>, <span class=\"hljs-string\">\"w+\"<\/span>) <span class=\"hljs-keyword\">as<\/span> f:\n    f.write(<span class=\"hljs-string\">'Kelly'<\/span>)\n    <span class=\"hljs-comment\"># move file handle to the start<\/span>\n    f.seek(<span class=\"hljs-number\">0<\/span>)\n    print(f.read())<\/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('code9', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><button class=\"hljs-run-button\" onclick=\"run_code('code9');\"><i class=\"far fa-play-circle\" aria-hidden=\"true\"><\/i> Run<\/button><\/div>\n\n\n<p><strong>Output<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Kelly<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-writing-to-a-binary-file\">Writing to a Binary File<\/h2>\n\n\n\n<p>The <code>open()<\/code> function, by default, opens a file in text mode. We can read the text file contents using the access mode as <code>r<\/code> and write new content in the text file using the access mode as <code>w<\/code>.<\/p>\n\n\n\n<p>To read or write content to a binary file, use the access mode &#8216;B&#8217;. For writing, it will be <code>wb<\/code>, and for reading, it will be <code>rb<\/code>.<\/p>\n\n\n\n<p>The <code>open()<\/code> function will check if the file already exists and if not, will create one. In the existing file, all the content will be deleted, and new content will be added.<\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code10\"  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\">file = open(<span class=\"hljs-string\">\"Writedemo.bin\"<\/span>, <span class=\"hljs-string\">\"wb\"<\/span>)\nfile.write(<span class=\"hljs-string\">\"This is a sample string stored in binary format\"<\/span>)\nfile.close()<\/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('code10', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><\/div>\n\n\n<p>The above code will create a binary file and the write the string passed in the <code>write()<\/code> method.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-summary\">Summary<\/h2>\n\n\n\n<p>In this article we have covered the basic methods for modifying a file. We also saw in detail the different access modes for performing the write operations. In addition to this we saw the different access modes for appending new content at the end of the file.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>It is pretty standard that large chunks of data need to store in the Files. Python is widely used in data analytics and comes with some inbuilt functions to write data into files. We can open a file and do different operations on it, such as write new contents into it or modify a file [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":9596,"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 Write to File &#8211; PYnative<\/title>\n<meta name=\"description\" content=\"Learn how to write to files in Python. 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