{"id":252,"date":"2024-08-31T08:48:46","date_gmt":"2024-08-31T08:48:46","guid":{"rendered":"https:\/\/techkubo.com\/python\/?p=252"},"modified":"2025-06-17T17:40:07","modified_gmt":"2025-06-17T17:40:07","slug":"file-input-and-output","status":"publish","type":"post","link":"https:\/\/techkubo.com\/python\/file-input-and-output\/","title":{"rendered":"Python File Input and Output"},"content":{"rendered":"\n

Reading and Writing to a File<\/h2>\n\n\n\n

Python allows you to read from and write to files using the built-in open()<\/code> function.<\/p>\n\n\n\n

Reading a File<\/b><\/p>\n\n\n\n

file = open("example.txt", "r")\ncontent = file.read()\nprint(content)\nfile.close()<\/pre><\/div>\n\n\n\n
Writing to a File<\/b><\/p>\n\n\n\n
file = open("example.txt", "w")\nfile.write("Hello, World!")\nfile.close()<\/pre><\/div>\n\n\n\n
    \n
  • Use \"r\"<\/code> mode to read a file and \"w\"<\/code> mode to write to a file. Be sure to close the file after performing operations to free up resources.<\/li>\n<\/ul>\n\n\n\n
    Appending to a File<\/h2>\n\n\n\n
    Appending allows you to add content to the end of a file without overwriting the existing data.<\/p>\n\n\n\n
    Example<\/b><\/p>\n\n\n\n
    file = open("example.txt", "a")\nfile.write("Appending some text.")\nfile.close()<\/pre><\/div>\n\n\n\n
      \n
    • The \"a\"<\/code> mode opens the file for appending. New content is added at the end of the file without altering existing content.<\/li>\n<\/ul>\n\n\n\n
      with<\/code> Context Manager<\/h2>\n\n\n\n
      The with<\/code> statement is used to simplify file handling. It automatically closes the file when the block of code is exited, even if an error occurs.<\/p>\n\n\n\n
      Example<\/strong><\/p>\n\n\n\n
      with open("example.txt", "r") as file:\n    content = file.read()\n    print(content)<\/pre><\/div>\n\n\n\n
        \n
      • The with<\/code> statement handles file closing automatically, ensuring that resources are properly freed.<\/li>\n<\/ul>\n\n\n\n
        Comma Separated Values (CSV) Files<\/h2>\n\n\n\n
        CSV (Comma-Separated Values) files are commonly used for storing tabular data. Python\u2019s csv<\/code> module makes it easy to work with CSV files.<\/p>\n\n\n\n
        Reading a CSV File<\/strong><\/p>\n\n\n\n
        import csv\n\nwith open("data.csv", "r") as file:\n    reader = csv.reader(file)\n    for row in reader:\n        print(row)<\/pre><\/div>\n\n\n\n
        <\/p>\n\n\n\n
        Writing to a CSV File<\/strong><\/p>\n\n\n\n
        import csv\n\nwith open("data.csv", "w", newline='') as file:\n    writer = csv.writer(file)\n    writer.writerow(["Name", "Age", "City"])\n    writer.writerow(["Tala", 22, "Manila"])<\/pre><\/div>\n\n\n\n
          \n
        • The csv.reader<\/code> reads CSV files row by row, and the csv.writer<\/code> writes rows to a CSV file. The newline=\u201d\u201d<\/code> argument prevents extra blank lines in the output file.<\/li>\n<\/ul>\n\n\n\n
          JavaScript Object Notation (JSON) Files<\/h2>\n\n\n\n
          JSON (JavaScript Object Notation) is a lightweight data format often used for data interchange between a server and a web application.<\/p>\n\n\n\n
          Reading a JSON File<\/strong><\/p>\n\n\n\n
          import json\n\nwith open("data.json", "r") as file:\n    data = json.load(file)\n    print(data)<\/pre><\/div>\n\n\n\n
          <\/p>\n\n\n\n
          Writing to a JSON File<\/strong><\/p>\n\n\n\n
          import json\n\ndata = {\n    "name": "Tala",\n    "age": 22,\n    "city": "Manila"\n}\n\nwith open("data.json", "w") as file:\n    json.dump(data, file)<\/pre><\/div>\n\n\n\n
            \n
          • The json.load()<\/code> function reads JSON data from a file, while json.dump()<\/code> writes data to a JSON file.<\/li>\n<\/ul>\n\n\n\n
            <\/p>\n","protected":false},"excerpt":{"rendered":"
            Reading and Writing to a File Python allows you to read from and write to files using the built-in open() […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-252","post","type-post","status-publish","format-standard","hentry","category-python"],"yoast_head":"\nPython File Input and Output - 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