Working with Files

File Handling Concepts Table

SI	Section	Usage Scenario	Pros	Cons
1	with open() for file handling	Reading/writing files safely, ensuring proper closure	Automatically closes files Cleaner code Less prone to errors	Limited to scope of with block
2	File Modes ('r', 'w', 'a')	Choose based on whether you're reading, writing, or appending	Flexible modes Supports text and binary modes 'r+' allows read/write	'w' can overwrite data Wrong mode may raise error
3	Reading large files efficiently	Log files, datasets – when full file can’t be loaded into memory	Memory efficient Great for huge files	Slightly more logic needed
4	File Reading Techniques	Different ways of reading based on need (whole, lines, line by line)	Multiple options for use cases readlines() useful for processing all at once	read() and readlines() can be memory-heavy for big files
5	Context Managers	Safe file and resource handling using with	Auto resource management Prevents file leaks Readable and Pythonic	Can't use file object after exiting with block

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Code Sample

with open()

with open('example.txt', 'r') as file:
    data = file.read()
    print(data)

Read or write

Reading Large Files Efficiently (Line by Line)

File Reading Techniques

Context Manager