Python File Handling From CSV to JSON 13
13 – File Handling ● Read Files ● Write Files ● CSV Files ● JSON Files
File Handling in Python
In Python, file handling is an essential aspect of data persistence and system administration. Python provides elegant, built-in abstractions to read from and write to files on your system.
1. File Handling Basics
Python abstracts physical files on a disk into file objects (also commonly referred to as streams or I/O objects). The standard built-in function open() acts as the primary gateway to instantiate these file objects.
Text vs. Binary Modes
When opening a file, you must specify the mode, which dictates how the file's data stream is processed:
Text Files: Opened in text mode (e.g., 'r' for reading, 'w' for writing). Text files read and write standard Python string (str) objects and automatically manage text encoding (decoding raw disk bytes into Unicode code points and vice-versa). Python's standard system streams (sys.stdin, sys.stdout, and sys.stderr) are initialized natively as text files.
Binary Files: Opened in binary mode (e.g., 'rb', 'wb'). These files read and write raw bytes-like objects (such as bytes or bytearray objects). They do not apply any text encoding or line-ending translations, making them suitable for non-text data like images or compressed archives.
The Importance of Explicit Closing
While Python's garbage collector will eventually reclaim memory and release external file resources when a file object becomes unreachable, this garbage collection is not guaranteed to occur immediately. To prevent resource exhaustion, memory leaks, and write-caching delays, programs should always explicitly close file objects using the .close() method as soon as they are no longer needed.
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