What is the role of the else and finally blocks in exception handling, and how do they differ from the try and except blocks?

In Python, exception handling is done using the try, except, else, and finally blocks. Here's how they work:

1. try block: This is the block of code that is attempted (or "tried"). If there is an exception, or error, that occurs in this block of code, execution immediately moves to the except block.

2. except block: This block of code is executed if an exception occurs in the try block. You can specify different except blocks for different types of exceptions.

3. else block: This block of code is executed if no exceptions occur in the try block. It must follow all except blocks. It is useful for code that must be executed if the try block is successful.

4. finally block: This block of code is always executed, whether an exception occurred or not. It is typically used for cleanup actions, such as closing files or network connections.

The main difference between these blocks is when they are executed. The try and except blocks are only executed if an exception occurs, while the else block is only executed if no exceptions occur. The finally block is always executed, regardless of whether an exception occurs or not.