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...
📚 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
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Tags
Python, Python tutorial, Python for beginners, learn Python, context managers, with statement, __enter__, __exit__, contextlib, contextmanager decorator, suppress,
resource management, Python basics, CelesteAI
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