What are some examples of higher-order functions in Python?

What are some examples of higher-order functions in Python?

Higher-order functions are functions that can take other functions as arguments or return them as results. Examples include 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 the filter() function?

The filter() function creates a list of elements for which a function returns true. For instance, filter(lambda x: x > 0, [-1, 0, 1, 2]) will return [1, 2].

Can you give an example of reduce()?

Certainly! The reduce() function from the functools module applies a rolling computation to sequential pairs of values in a list. For example, reduce(lambda x, y: x + y, [1, 2, 3, 4]) will return 10, which is the sum of the list.