How to implement guide with context managers in python 2.7 when using custom classes
I'm optimizing some code but Does anyone know how to I'm having trouble implementing a context manager for a custom class in Python 2.7... I followed the basic structure of defining `__enter__` and `__exit__` methods, but I encounter an unexpected behavior when trying to use it. My context manager is supposed to open a resource, perform some operations, and ensure the resource is cleaned up afterward. Here's the code I have: ```python class Resource: def __enter__(self): print('Acquiring resource') return self def __exit__(self, exc_type, exc_val, exc_tb): print('Releasing resource') def do_something(self): print('Doing something with the resource') with Resource() as res: res.do_something() raise ValueError('An behavior occurred') ``` When I run this, I expect to see 'Releasing resource' printed, even with the exception. However, it looks like the context manager is not handling the exception properly since I do not see the cleanup message. In fact, the program terminates with the ValueError and doesn't reach the `__exit__` method at all. I’ve also tried adding a `print` statement at the beginning of `__exit__`, but it never gets executed. What could be causing this scenario? Is there a specific requirement in Python 2.7 for context managers that I might be overlooking? Any insights would be greatly appreciated. How would you solve this? For reference, this is a production application. I'd really appreciate any guidance on this.