What are some examples of functional programming in Python?

What are some examples of functional programming in Python?

Functional programming in Python emphasizes the use of functions as first-class citizens. 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, returning 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 using reduce?

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