What are context managers in Python and can you provide some examples?

What are context managers in Python and can you provide some examples?

Context managers in Python are used to manage resources efficiently. They ensure that resources are properly acquired and released. A common example is using the with statement to open a file.

Can you show me a code example of using a context manager to open a file?

Sure! Here's a simple example:

with open('file.txt', 'r') as file:
    data = file.read()
    print(data)

This automatically closes the file after the block is executed.

What happens if an error occurs while the file is open?

If an error occurs, the context manager ensures that the file is still closed properly, preventing resource leaks.

Are there any other use cases for context managers?

Yes, context managers can be used for database connections, threading locks, and more, helping to manage resources effectively.