What are some examples of functional programming in Python?

What are some examples of functional programming in Python?

Functional programming in Python includes using functions as first-class citizens, higher-order functions, and more. Examples include using map(), filter(), and reduce().

Can you explain how the map() function works?

Sure! The map() function applies a given function to all items in an iterable (like a list) and returns a map object (which can be converted to a list). For example, map(lambda x: x**2, [1, 2, 3]) will return [1, 4, 9].

What about filter()? How is it different from map()?

The filter() function is used to filter items out of an iterable based on a function that returns True or False. For instance, filter(lambda x: x > 2, [1, 2, 3, 4]) will return [3, 4], keeping only the items that satisfy the condition.

Can you give an example of using reduce()?

Certainly! The reduce() function from the functools module reduces an iterable to a single value by applying a binary function cumulatively. For example, reduce(lambda x, y: x + y, [1, 2, 3, 4]) will return 10, which is the sum of the list.