What are some use cases for try-finally in Python?

What are some use cases for try-finally in Python?

The try-finally block in Python is used to ensure that certain cleanup actions are taken, regardless of whether an error occurs. Common use cases include closing files, releasing resources, and handling network connections.

Can you give me an example of using try-finally with file handling?

Sure! Here's a simple example:

try:
    file = open('example.txt', 'r')
    data = file.read()
finally:
    file.close()  # This will always execute, even if an error occurs.

What happens if an exception occurs before the finally block?

If an exception occurs in the try block, the code in the finally block will still execute. This ensures that cleanup actions are performed.

Are there any performance implications of using try-finally?

Using try-finally can have a slight performance overhead due to the additional control flow, but it's generally negligible compared to the benefits of ensuring resource management.