What is the difference between filter and map in Python?

What is the difference between filter and map in Python?

In Python, filter is used to filter elements from an iterable based on a function that returns True or False, while map applies a function to all items in an iterable and returns a new iterable.

Can you give me an example of how to use both?

Sure! For filter, you might use it like this: list(filter(lambda x: x > 5, [1, 2, 3, 6, 7])) which returns [6, 7]. For map, you could do: list(map(lambda x: x * 2, [1, 2, 3])) which returns [2, 4, 6].

When would I use one over the other?

Use filter when you want to select items based on a condition, and use map when you want to transform items in a collection.

Are there any performance differences between them?

Yes, filter can be more efficient when you only need to select items, while map is better for transforming data. However, the difference is often negligible for small datasets.