contextlib.contextmanager()

Utility

Decorator to create context managers from generator functions using yield.

Signature

@contextmanager

Returns

generator

Example

from contextlib import contextmanager

@contextmanager
def timer():
    import time
    start = time.time()
    yield
    print(f'Elapsed: {time.time()-start:.2f}s')

About contextlib.contextmanager()

contextlib.contextmanager is a Python utility function with the signature @contextmanager. Decorator to create context managers from generator functions using yield. It returns a value of type generator.

Python provides a rich set of built-in functions and standard library modules that cover common programming tasks. Understanding these functions helps you write more idiomatic, efficient Python code. The contextlib.contextmanagerfunction is commonly used in data processing, web development, scripting, and automation tasks.

When working with contextlib.contextmanager(), consider edge cases like empty inputs, None values, and type mismatches. Python's duck typing means many built-in functions work with any object that implements the required protocol (e.g., __len__ for len(), __iter__ for iteration). This flexibility is a key strength of Python's design philosophy.

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