Python Context Managers Explained - with Statement, __enter__, __exit__ & contextlib | Tutorial #25

Learn context managers in Python! 🔒 In this lesson, you will learn: ✅ The with statement for automatic resource management ✅ File handling with context managers ✅ Class-based context managers (__enter__ and __exit__) ✅ Timer context manager for measuring execution time ✅ Error handling in __exit__ (suppressing exceptions) ✅ The @contextmanager decorator from contextlib ✅ Generator-based context managers with yield ✅ Multiple nested context managers ✅ contextlib.suppress for silencing exceptions ✅ Mini Project: Resource Manager (database, logger, transactions) 🕐 Timestamps: 0:00 - Introduction 0:22 - Context Basics Explained 0:49 - Context Basics Demo 3:11 - Contextlib Decorators Explained 3:38 - Contextlib Decorators Demo 6:55 - Resource Manager Explained 7:22 - Resource Manager Demo 10:59 - Recap 11:34 - End 💻 Source Code: https://github.com/GoCelesteAI/python_context_managers 📚 Code from this lesson: # Class-based context manager class Timer: def __enter__(self): self.start = time.time() return self def __exit__(self, exc_type, exc_val, exc_tb): print(f"Elapsed: {time.time() - self.start:.4f}s") return False # Generator-based context manager @contextmanager def database(name): db = {"name": name, "connected": True} yield db db["connected"] = False 🔗 Previous: Lesson 24 - Iterators & Generators 🔗 Next: Lesson 26 - Regular Expressions #Python #PythonTutorial #LearnPython #Programming #ContextManagers #WithStatement #Contextlib #PythonBasics Tags Python, Python tutorial, Python for beginners, learn Python, context managers, with statement, __enter__, __exit__, contextlib, contextmanager decorator, suppress, resource management, Python basics, CelesteAI