{"id":26672,"date":"2022-04-02T20:20:07","date_gmt":"2022-04-02T14:50:07","guid":{"rendered":"https:\/\/python-programs.com\/?p=26672"},"modified":"2022-04-02T20:20:07","modified_gmt":"2022-04-02T14:50:07","slug":"how-to-change-case-of-all-characters-in-a-txt-file-in-python","status":"publish","type":"post","link":"https:\/\/python-programs.com\/how-to-change-case-of-all-characters-in-a-txt-file-in-python\/","title":{"rendered":"How to Change Case of All Characters in a .txt File in Python"},"content":{"rendered":"<p><strong>lower() Method:<\/strong><\/p>\n<p>The lower() method in python returns a string with all characters in lower case. Symbols and numbers are ignored by this method.<\/p>\n<p><strong>upper() Method:<\/strong><\/p>\n<p>The upper() method in python returns a string with all characters in the upper case. Symbols and numbers are ignored by this method.<\/p>\n<p>Let us take a samplefile.txt as an Example here which contains the following content.<\/p>\n<p><strong>samplefile.txt:<\/strong><\/p>\n<pre>Hello THIS is PYTHON-programs PLATform\r\nGOOd morning All<\/pre>\n<h3>Converting All Characters in a Text File to Uppercase<\/h3>\n<p><strong>Approach:<\/strong><\/p>\n<ul>\n<li>Open some random file in read-only mode by passing filename\/path, mode as arguments to it.<\/li>\n<li>Read the given file using the read() function and loop through each letter of the text file using the for loop<\/li>\n<li>Convert each letter of the given text file to uppercase using the upper() function and store it in a variable.<\/li>\n<li>Open some random new file in append mode using the open() function by passing file path, mode as arguments to it.<\/li>\n<li>Store it in another variable.<\/li>\n<li>Append the above converted uppercase character to the new file using the write() function.<\/li>\n<li>The Exit of the Program.<\/li>\n<\/ul>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Open some random file in read-only mode by passing filename\/path, mode as arguments to it. \r\ngvn_file = open('samplefile.txt', 'r')\r\n# Read the given file using read() function and loop through each letter of the text file\r\n# using the for loop\r\nfor k in gvn_file.read():\r\n    # Convert each letter of the given text file to uppercase using the upper() function\r\n    # and store it in a variable.\r\n    res = k.upper()\r\n    # Open some random new file in append mode using the open() function by passing file path, \r\n    # mode as arguments to it. \r\n    # Store it in another variable.\r\n    output_file = open('output_file', 'a')\r\n    # Append the above converted uppercase character to the new file using the write() function\r\n    output_file.write(res)<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>HELLO THIS IS PYTHON-PROGRAMS PLATFORM\r\nGOOD MORNING ALL<\/pre>\n<h3>Converting All Characters in a Text File to Lowercase<\/h3>\n<p><strong>Approach:<\/strong><\/p>\n<ul>\n<li>Open some random file in read-only mode by passing filename\/path, mode as arguments to it.<\/li>\n<li>Read the given file using the read() function and loop through each letter of the text file using the for loop<\/li>\n<li>Convert each letter of the given text file to lowercase using the lower() function and store it in a variable.<\/li>\n<li>Open some random new file in append mode using the open() function by passing file path, mode as arguments to it.<\/li>\n<li>Store it in another variable.<\/li>\n<li>Append the above converted lowercase character to the new file using the write() function.<\/li>\n<li>The Exit of the Program.<\/li>\n<\/ul>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Open some random file in read-only mode by passing filename\/path, mode as arguments to it. \r\ngvn_file = open('samplefile.txt', 'r')\r\n# Read the given file using read() function and loop through each letter of the text file\r\n# using the for loop\r\nfor k in gvn_file.read():\r\n    # Convert each letter of the given text file to lowercase using the lower() function\r\n    # and store it in a variable.\r\n    res = k.lower()\r\n    # Open some random new file in append mode using the open() function by by passing file path, \r\n    # mode as arguments to it. \r\n    # Store it in another variable.\r\n    output_file = open('output_file', 'a')\r\n    # Append the above converted lowercase character to the new file using the write() function\r\n    output_file.write(res)<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>hello this is python-programs platform\r\ngood morning all<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>lower() Method: The lower() method in python returns a string with all characters in lower case. Symbols and numbers are ignored by this method. upper() Method: The upper() method in python returns a string with all characters in the upper case. Symbols and numbers are ignored by this method. Let us take a samplefile.txt as &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/how-to-change-case-of-all-characters-in-a-txt-file-in-python\/\"> <span class=\"screen-reader-text\">How to Change Case of All Characters in a .txt File in Python<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true},"categories":[5],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Change Case of All Characters in a .txt File in Python - Python Programs<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/python-programs.com\/how-to-change-case-of-all-characters-in-a-txt-file-in-python\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Change Case of All Characters in a .txt File in Python - Python Programs\" \/>\n<meta property=\"og:description\" content=\"lower() Method: The lower() method in python returns a string with all characters in lower case. Symbols and numbers are ignored by this method. upper() Method: The upper() method in python returns a string with all characters in the upper case. Symbols and numbers are ignored by this method. 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