{"id":11121,"date":"2023-01-05T16:44:15","date_gmt":"2023-01-05T11:14:15","guid":{"rendered":"https:\/\/pynative.com\/?p=11121"},"modified":"2023-01-05T16:50:55","modified_gmt":"2023-01-05T11:20:55","slug":"python-save-dictionary-to-file","status":"publish","type":"post","link":"https:\/\/pynative.com\/python-save-dictionary-to-file\/","title":{"rendered":"Python Save Dictionary To File"},"content":{"rendered":"\n<p>In this lesson, you\u2019ll learn how to save a <a href=\"https:\/\/pynative.com\/python-dictionaries\/\">dictionary<\/a> to a file in Python. Also, we&#8217;ll see how to read the same dictionary from a file.<\/p>\n\n\n\n<p><strong>In this lesson, you\u2019ll learn how to<\/strong>:<\/p>\n\n\n\n<ul>\n<li>Use the pickle module to save the dictionary object to a file.<\/li>\n\n\n\n<li>Save the dictionary to a text file.<\/li>\n\n\n\n<li>Use the <code>dump()<\/code> method of a json module to write a dictionary in a json file.<\/li>\n\n\n\n<li>Write the dictionary to a CSV file.<\/li>\n<\/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-how-to-save-a-dictionary-to-file-in-python\" data-level=\"2\">How to save a dictionary to file in Python<\/a><ul><li><a href=\"#h-example-save-a-dictionary-to-file\" data-level=\"3\">Example: save a dictionary to file<\/a><\/li><li><a href=\"#h-read-dictionary-from-a-file\" data-level=\"3\">Read Dictionary from a File<\/a><\/li><\/ul><\/li><li><a href=\"#h-save-a-dictionary-to-a-text-file-using-the-json-module\" data-level=\"2\">Save a dictionary to a text file using the json module<\/a><\/li><li><a href=\"#h-save-the-dictionary-to-a-csv-file\" data-level=\"2\">Save the dictionary to a CSV file<\/a><\/li><\/ul><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-to-save-a-dictionary-to-file-in-python\">How to save a dictionary to file in Python<\/h2>\n\n\n\n<div class=\"schema-how-to wp-block-yoast-how-to-block\"><p class=\"schema-how-to-description\"><a href=\"https:\/\/pynative.com\/python-dictionaries\/\">Dictionaries<\/a> are ordered collections of unique values stored in (Key-Value) pairs. The below steps show how to use the pickle module to save the dictionary to a file. <\/p> <ol class=\"schema-how-to-steps\"><li class=\"schema-how-to-step\" id=\"how-to-step-1671521499256\"><strong class=\"schema-how-to-step-name\">Import pickle module<\/strong> <p class=\"schema-how-to-step-text\">The <a href=\"https:\/\/docs.python.org\/3\/library\/pickle.html\" target=\"_blank\" rel=\"noreferrer noopener\">pickle module<\/a> is used for <strong>serializing and de-serializing a Python object structure<\/strong>.<br\/><br\/>Pickling\u201d is the process whereby a Python object is converted into a byte stream, and \u201cunpickling\u201d is the inverse operation whereby a byte stream (from a binary file) is converted back into an original object.<br\/><br\/>We can save a dictionary object as a serialized byte sequence into a file using the pickle module. Also, we can read them from a file into a Python script by unpickling them.<\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-1671522230821\"><strong class=\"schema-how-to-step-name\">Open a file in write\/append binary mode.<\/strong> <p class=\"schema-how-to-step-text\">Whenever we write content into a file, we have to open the file in one of the specified access modes. <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, filename and access mode, and returns the file pointer.<br\/><br\/>To open a binary file for writing, use the <code><strong>wb<\/strong><\/code> access mode. After you open the <a href=\"https:\/\/pynative.com\/python-write-file\/\">file for writing<\/a>, the FileHandle is placed at the beginning of the file, and existing content will be truncated. A new file is created if the file doesn&#8217;t exist.<\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-1671523273882\"><strong class=\"schema-how-to-step-name\">Use the dump() method of the pickle module<\/strong> <p class=\"schema-how-to-step-text\">Now, we&#8217;ll use the <code><strong>dump()<\/strong><\/code> method to save the dictionary into a file. <br\/><br\/>The <code>dump()<\/code> method writes the pickled representation of the Python object to the open file. In our case, The dictionary object gets converted into a byte stream.<\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-1672915791005\"><strong class=\"schema-how-to-step-name\">Read a dictionary from the file.<\/strong> <p class=\"schema-how-to-step-text\">Use a pickle module&#8217;s <code><strong>load()<\/strong><\/code> method to read the same dictionary from a file.<\/p> <\/li><\/ol><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-example-save-a-dictionary-to-file\">Example: save a dictionary to file<\/h3>\n\n\n\n<p>Let&#8217;s see the below example of how you can use the <code>pickle<\/code> module to save a dictionary to a <code>person_data.pkl<\/code> 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\"><span class=\"hljs-keyword\">import<\/span> pickle\n\n<span class=\"hljs-comment\"># create a dictionary using {}<\/span>\nperson = {<span class=\"hljs-string\">\"name\"<\/span>: <span class=\"hljs-string\">\"Jessa\"<\/span>, <span class=\"hljs-string\">\"country\"<\/span>: <span class=\"hljs-string\">\"USA\"<\/span>, <span class=\"hljs-string\">\"telephone\"<\/span>: <span class=\"hljs-number\">1178<\/span>}\nprint(<span class=\"hljs-string\">'Person dictionary'<\/span>)\nprint(person)\n\n<span class=\"hljs-comment\"># save dictionary to person_data.pkl file<\/span>\n<span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">'person_data.pkl'<\/span>, <span class=\"hljs-string\">'wb'<\/span>) <span class=\"hljs-keyword\">as<\/span> fp:\n    pickle.dump(person, fp)\n    print(<span class=\"hljs-string\">'dictionary saved successfully to file'<\/span>)<\/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><strong>Output<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Person dictionary\n{'name': 'Jessa', 'country': 'USA', 'telephone': 1178}\ndictionary saved successfully to file<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-read-dictionary-from-a-file\">Read Dictionary from a File<\/h3>\n\n\n\n<p>Now read the same dictionary from a file using a pickle module&#8217;s <code>load()<\/code> method.<\/p>\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\">import<\/span> pickle\n\n<span class=\"hljs-comment\"># Read dictionary pkl file<\/span>\n<span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">'person_data.pkl'<\/span>, <span class=\"hljs-string\">'rb'<\/span>) <span class=\"hljs-keyword\">as<\/span> fp:\n    person = pickle.load(fp)\n    print(<span class=\"hljs-string\">'Person dictionary'<\/span>)\n    print(person)<\/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<p><strong>Output<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Person dictionary\n{'name': 'Jessa', 'country': 'USA', 'telephone': 1178}<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-save-a-dictionary-to-a-text-file-using-the-json-module\">Save a dictionary to a text file using the json module<\/h2>\n\n\n\n<p>We can use the <a href=\"https:\/\/pynative.com\/python\/json\/\">Python json<\/a> module to write dictionary objects as text data into the file. This module provides methods to encode and decode data in JSON and text formats.<\/p>\n\n\n\n<p>We will use the following two methods of a json module.<\/p>\n\n\n\n<ul>\n<li>The <a href=\"https:\/\/pynative.com\/python-json-dumps-and-dump-for-json-encoding\/\">dump()<\/a> method is used to write Python objects as JSON formatted data into a file.<\/li>\n\n\n\n<li>Using the <a href=\"https:\/\/pynative.com\/python-json-load-and-loads-to-parse-json\/\">load()<\/a> method, we can read JSON data from text, JSON, or a binary file to a dictionary object.<\/li>\n<\/ul>\n\n\n\n<p>Let&#8217;s see the below example of how you can use the json module to save a dictionary to a text file.<\/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\"><span class=\"hljs-keyword\">import<\/span> json\n\n<span class=\"hljs-comment\"># assume you have the following dictionary<\/span>\nperson = {<span class=\"hljs-string\">\"name\"<\/span>: <span class=\"hljs-string\">\"Jessa\"<\/span>, <span class=\"hljs-string\">\"country\"<\/span>: <span class=\"hljs-string\">\"USA\"<\/span>, <span class=\"hljs-string\">\"telephone\"<\/span>: <span class=\"hljs-number\">1178<\/span>}\nprint(<span class=\"hljs-string\">'Person dictionary'<\/span>)\nprint(person)\n\nprint(<span class=\"hljs-string\">\"Started writing dictionary to a file\"<\/span>)\n<span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">\"person.txt\"<\/span>, <span class=\"hljs-string\">\"w\"<\/span>) <span class=\"hljs-keyword\">as<\/span> fp:\n    json.dump(person, fp)  <span class=\"hljs-comment\"># encode dict into JSON<\/span>\nprint(<span class=\"hljs-string\">\"Done writing dict into .txt file\"<\/span>)<\/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<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><strong>Output<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Person dictionary\n{'name': 'Jessa', 'country': 'USA', 'telephone': 1178}\n\nStarted writing dictionary to a file\nDone writing dict into .txt file<\/pre>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"513\" height=\"95\" src=\"https:\/\/pynative.com\/wp-content\/uploads\/2023\/01\/person_text_file.jpg\" alt=\"Person text file\" class=\"wp-image-11126\" srcset=\"https:\/\/pynative.com\/wp-content\/uploads\/2023\/01\/person_text_file.jpg 513w, https:\/\/pynative.com\/wp-content\/uploads\/2023\/01\/person_text_file-300x56.jpg 300w\" sizes=\"(max-width: 513px) 100vw, 513px\" \/><figcaption class=\"wp-element-caption\">Person text file<\/figcaption><\/figure><\/div><\/div>\n<\/div>\n\n\n\n<p><strong>Note<\/strong>: You can also use the <code>dump()<\/code> method to write a dictionary in a json file. Only you need to change the file extension to json while writing it.<\/p>\n\n\n\n<p><strong>Read a dictionary from a text file.<\/strong><\/p>\n\n\n\n<p>Now, let&#8217;s see how to read the same dictionary from the file using the <code>load()<\/code> function.<\/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-keyword\">import<\/span> json\n\n<span class=\"hljs-comment\"># Open the file for reading<\/span>\n<span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">\"person.txt\"<\/span>, <span class=\"hljs-string\">\"r\"<\/span>) <span class=\"hljs-keyword\">as<\/span> fp:\n    <span class=\"hljs-comment\"># Load the dictionary from the file<\/span>\n    person_dict = json.load(fp)\n\n<span class=\"hljs-comment\"># Print the contents of the dictionary<\/span>\nprint(person_dict)<\/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><strong>Output<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">{'name': 'Jessa', 'country': 'USA', 'telephone': 1178}<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-save-the-dictionary-to-a-csv-file\">Save the dictionary to a CSV file<\/h2>\n\n\n\n<p>The <a href=\"https:\/\/docs.python.org\/3\/library\/csv.html\" target=\"_blank\" rel=\"noreferrer noopener\">Python csv library<\/a> provides functionality to read from and write to CSV files.<\/p>\n\n\n\n<ul>\n<li>Use the <code>csv.DictReader()<\/code> method to read CSV files into a dictionary.<\/li>\n\n\n\n<li>Use the <code>csv.DictWriter()<\/code> method to write a dictionary to a CSV file.<\/li>\n<\/ul>\n\n\n\n<p><strong>Example<\/strong>: Save the dictionary to a CSV 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-keyword\">import<\/span> csv\n\n<span class=\"hljs-comment\"># Dictionary to be saved<\/span>\nperson = {<span class=\"hljs-string\">\"name\"<\/span>: <span class=\"hljs-string\">\"Jessa\"<\/span>, <span class=\"hljs-string\">\"country\"<\/span>: <span class=\"hljs-string\">\"USA\"<\/span>, <span class=\"hljs-string\">\"telephone\"<\/span>: <span class=\"hljs-number\">1178<\/span>}\nprint(<span class=\"hljs-string\">'Person dictionary'<\/span>)\nprint(person)\n\n<span class=\"hljs-comment\"># Open a csv file for writing<\/span>\n<span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">\"person.csv\"<\/span>, <span class=\"hljs-string\">\"w\"<\/span>, newline=<span class=\"hljs-string\">\"\"<\/span>) <span class=\"hljs-keyword\">as<\/span> fp:\n    <span class=\"hljs-comment\"># Create a writer object<\/span>\n    writer = csv.DictWriter(fp, fieldnames=person.keys())\n\n    <span class=\"hljs-comment\"># Write the header row<\/span>\n    writer.writeheader()\n\n    <span class=\"hljs-comment\"># Write the data rows<\/span>\n    writer.writerow(person)\n    print(<span class=\"hljs-string\">'Done writing dict to a csv file'<\/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>\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>Output<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Person dictionary\n{'name': 'Jessa', 'country': 'USA', 'telephone': 1178}\n\nDone writing dict to a csv file<\/pre>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"450\" height=\"219\" src=\"https:\/\/pynative.com\/wp-content\/uploads\/2023\/01\/person_csv_file.jpg\" alt=\"Person csv file\" class=\"wp-image-11125\" srcset=\"https:\/\/pynative.com\/wp-content\/uploads\/2023\/01\/person_csv_file.jpg 450w, https:\/\/pynative.com\/wp-content\/uploads\/2023\/01\/person_csv_file-300x146.jpg 300w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><figcaption class=\"wp-element-caption\">Person csv file<\/figcaption><\/figure><\/div><\/div>\n<\/div>\n\n\n\n<p><strong>Example<\/strong>: Read a dictionary from a csv 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\">import<\/span> csv\n\n<span class=\"hljs-comment\"># Open the csv file for reading<\/span>\n<span class=\"hljs-keyword\">with<\/span> open(<span class=\"hljs-string\">\"person.csv\"<\/span>, <span class=\"hljs-string\">\"r\"<\/span>) <span class=\"hljs-keyword\">as<\/span> infile:\n    <span class=\"hljs-comment\"># Create a reader object<\/span>\n    reader = csv.DictReader(infile)\n\n    <span class=\"hljs-comment\"># Iterate through the rows<\/span>\n    <span class=\"hljs-keyword\">for<\/span> row <span class=\"hljs-keyword\">in<\/span> reader:\n        print(row)<\/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<p><strong>Output<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">OrderedDict([('name', 'Jessa'), ('country', 'USA'), ('telephone', '1178')])<\/pre>\n\n\n\n<p><strong>Note<\/strong>: This will read the contents of the <code>person.csv<\/code> file and create a dictionary for each row in the file. You can then iterate through the rows and access the values in the dictionary using the column names as keys.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this lesson, you\u2019ll learn how to save a dictionary to a file in Python. Also, we&#8217;ll see how to read the same dictionary from a file. In this lesson, you\u2019ll learn how to: How to save a dictionary to file in Python Example: save a dictionary to file Let&#8217;s see the below example of [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"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":[22,1],"tags":[32],"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 Save Dictionary To File [4 Ways] &#8211; PYnative<\/title>\n<meta name=\"description\" content=\"Learn to save a dictionary to a file in Python. 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