python contextlib

with block

1. File operations: Automatically closing files after use.

2. Thread and process locking: Acquiring and releasing locks.

3. Database connections: Connecting to and disconnecting from databases.

4. Temporary environments: Creating and cleaning up temporary environments.

5. Logging: Temporarily changing logging levels.

6. Timing operations: Measuring the execution time of a block of code.

How

Python with

• __enter__

• __exit__

from contextlib import contextmanager
import time

@contextmanager
deftimer(label):
 start = time.time()
try:
 yield
finally:
 end = time.time()
print(f'{label}: {end - start} seconds')

# Usage:
with timer('Model training'):
# Your code block here, e.g.:
# train your model

contextlib - Utilities for with-statement contexts - Python 3.9.5 documentation

Source code: Lib/contextlib.py Functions and classes provided: class contextlib. AbstractAsyncContextManager An abstract base class for classes that implement and . A default implementation for is provided which returns while is an abstract method which by default returns . See also the definition of Asynchronous Context Managers .

https://docs.python.org/3/library/contextlib.html