How do I use map, filter, and reduce in Python?

How do I use map, filter, and reduce in Python?

You can use map, filter, and reduce to process collections in Python. Would you like examples for each?

Yes, please provide examples for all three.

Sure! For map, you can use it to apply a function to all items in a list. For example: list(map(lambda x: x*2, [1, 2, 3])) returns [2, 4, 6].

For filter, it filters items based on a condition: list(filter(lambda x: x > 1, [1, 2, 3])) returns [2, 3].

And for reduce, you need to import it from functools: from functools import reduce. An example is reduce(lambda x, y: x + y, [1, 2, 3]) which returns 6.

Can you explain how each of these functions works internally?

Absolutely! map applies the function to each item and returns a map object, which can be converted to a list. filter checks each item against the condition and returns only those that match. reduce takes two items at a time, applies the function, and continues until one value remains.