File I/O & Path Operations
Master file handling in Python. Learn to read, write, and manage files safely with modern pathlib.
Master file handling in Python. Learn to read, write, and manage files safely with modern pathlib. This hands-on tutorial focuses on practical implementation of file i/o & path operations concepts.
File I/O & Path Operations
Working with files is essential for real-world applications. Python makes file operations simple and safe.
Opening Files: The open() Function
The open() function creates a file object for reading or writing.
Syntax: open(filename, mode)
File Modes
| Mode | Description | Creates if Missing? |
|---|---|---|
| 'r' | Read (default) | ❌ Error if missing |
| 'w' | Write (overwrites) | ✅ Yes |
| 'a' | Append | ✅ Yes |
| 'r+' | Read + Write | ❌ Error if missing |
| 'rb' | Read binary | ❌ Error if missing |
| 'wb' | Write binary | ✅ Yes |
Reading Files
Writing Files
Context Managers: The with Statement 🔒
Always use with for file operations. It automatically closes the file, even if an error occurs.
Modern Path Handling: pathlib 🛤️
pathlib provides an object-oriented way to work with file paths.
Reading Line by Line (Memory Efficient) 📖
For large files, read line by line instead of loading everything into memory.
File Operations with pathlib
Working with CSV Files 📊
CSV (Comma-Separated Values) is a common data format.
Error Handling with Files ⚠️
Always handle potential file errors.
Coding Challenge: Log File Analyzer 📝
Create a function to analyze log files.
AI Mentor
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Quiz
Quiz
Question 1 of 5Which file mode overwrites existing content?
Key Takeaways
✅ Use with open() for automatic file closing.
✅ File modes: 'r' read, 'w' write, 'a' append.
✅ pathlib is the modern way to handle paths.
✅ Read large files line by line for memory efficiency.
✅ Always handle exceptions when working with files.
What's Next?
In the next lesson, we'll learn about Exception Handling - how to handle errors gracefully and create custom exceptions.
Keep coding! 🚀