Context Manager and Contextlib in Python

About context managers

Python came out with a special new keyword several years ago in Python 2.5 that is known as the with statement. This new keyword allows a developer to create context managers. But wait! What’s a context manager? They are handy constructs that allow us to set something up and tear something down automatically. For example, we might want to open a file, write a bunch of stuff to it and then close it. This is probably the classic example of a context manager. In fact, Python creates one ...