{"id":66,"date":"2025-10-21T04:26:07","date_gmt":"2025-10-21T04:26:07","guid":{"rendered":"https:\/\/codetypingpro.com\/?p=66"},"modified":"2025-12-17T07:47:22","modified_gmt":"2025-12-17T07:47:22","slug":"lesson-11-file-handling-in-python","status":"publish","type":"post","link":"https:\/\/codetypingpro.com\/?p=66","title":{"rendered":"Lesson 11: File Handling in Python"},"content":{"rendered":"\n

\ud83c\udfaf Lesson Objective<\/strong><\/h3>\n\n\n\n

To learn how to create, read, write, and manage files<\/strong> in Python using built-in file handling methods.<\/p>\n\n\n\n

\n\n\n\n

\ud83e\udde9 1. What Is File Handling?<\/strong><\/h2>\n\n\n\n

File handling allows Python programs to store and retrieve data from files<\/strong>.
Common file types: Text files (.txt)<\/strong>, CSV files (.csv)<\/strong>, JSON files (.json)<\/strong>, etc.<\/p>\n\n\n\n

\n\n\n\n

\u2699\ufe0f 2. Opening a File<\/strong><\/h2>\n\n\n\n

Use the open()<\/code> function to open a file.<\/p>\n\n\n\n

file = open(\"example.txt\", \"w\")  # w \u2192 write mode\n<\/code><\/pre>\n\n\n\n
File Modes<\/h3>\n\n\n\n
Mode<\/th>Description<\/th><\/tr><\/thead>
r<\/code><\/td>Read (default)<\/td><\/tr>
w<\/code><\/td>Write (creates new or overwrites)<\/td><\/tr>
a<\/code><\/td>Append<\/td><\/tr>
x<\/code><\/td>Create (fails if file exists)<\/td><\/tr>
r+<\/code><\/td>Read and write<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n\n\n\n
\u270f\ufe0f 3. Writing to a File<\/strong><\/h2>\n\n\n\n
file = open(\"example.txt\", \"w\")\nfile.write(\"Hello, Python File Handling!\\n\")\nfile.write(\"This is a second line.\")\nfile.close()\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
\ud83d\udcd6 4. Reading from a File<\/strong><\/h2>\n\n\n\n
file = open(\"example.txt\", \"r\")\ncontent = file.read()\nprint(content)\nfile.close()\n<\/code><\/pre>\n\n\n\n
\u2705 Output:<\/strong><\/p>\n\n\n\n
Hello, Python File Handling!\nThis is a second line.\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
\ud83d\udd04 5. Reading Line by Line<\/strong><\/h3>\n\n\n\n
file = open(\"example.txt\", \"r\")\nfor line in file:\n    print(line.strip())\nfile.close()\n<\/code><\/pre>\n\n\n\n
Output:<\/strong><\/p>\n\n\n\n
Hello, Python File Handling!\nThis is a second line.\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
\u2795 6. Appending to a File<\/strong><\/h2>\n\n\n\n
file = open(\"example.txt\", \"a\")\nfile.write(\"\\nAdding a new line.\")\nfile.close()\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
\ud83d\udee1\ufe0f 7. Using with<\/code> Statement<\/strong><\/h2>\n\n\n\n
Automatically closes the file after operations.<\/p>\n\n\n\n
with open(\"example.txt\", \"r\") as file:\n    content = file.read()\n    print(content)\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
\ud83e\uddee 8. Other Useful File Methods<\/strong><\/h2>\n\n\n\n
Method<\/th>Description<\/th>Example<\/th><\/tr><\/thead>
read(size)<\/code><\/td>Reads size<\/code> characters<\/td>file.read(10)<\/code><\/td><\/tr>
readline()<\/code><\/td>Reads one line<\/td>file.readline()<\/code><\/td><\/tr>
readlines()<\/code><\/td>Reads all lines into a list<\/td>file.readlines()<\/code><\/td><\/tr>
tell()<\/code><\/td>Returns current cursor position<\/td>file.tell()<\/code><\/td><\/tr>
seek(offset)<\/code><\/td>Moves cursor to position<\/td>file.seek(0)<\/code><\/td><\/tr>
truncate()<\/code><\/td>Truncates file<\/td>file.truncate(10)<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\n\n\n\n
\ud83c\udf0d 9. Real-Life Example \u2013 Logging Messages<\/strong><\/h2>\n\n\n\n
with open(\"log.txt\", \"a\") as log_file:\n    log_file.write(\"User logged in at 10:00 AM\\n\")\n\nwith open(\"log.txt\", \"r\") as log_file:\n    logs = log_file.read()\n    print(logs)\n<\/code><\/pre>\n\n\n\n
Output:<\/strong><\/p>\n\n\n\n
User logged in at 10:00 AM\n<\/code><\/pre>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
\ud83c\udfaf Lesson Objective To learn how to create, read, write, and manage files in Python using built-in file handling methods. \ud83e\udde9 1. What Is File Handling? File handling allows Python programs to store and retrieve data from files.Common file types: Text files (.txt), CSV files (.csv), JSON files (.json), etc. \u2699\ufe0f 2. Opening a File […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,1],"tags":[],"class_list":["post-66","post","type-post","status-publish","format-standard","hentry","category-python-easy-course-outline","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/codetypingpro.com\/index.php?rest_route=\/wp\/v2\/posts\/66","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/codetypingpro.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/codetypingpro.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/codetypingpro.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/codetypingpro.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=66"}],"version-history":[{"count":1,"href":"https:\/\/codetypingpro.com\/index.php?rest_route=\/wp\/v2\/posts\/66\/revisions"}],"predecessor-version":[{"id":67,"href":"https:\/\/codetypingpro.com\/index.php?rest_route=\/wp\/v2\/posts\/66\/revisions\/67"}],"wp:attachment":[{"href":"https:\/\/codetypingpro.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=66"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/codetypingpro.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=66"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/codetypingpro.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=66"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}