exercise_42.md

Exercise 42

Write a program which can map() and filter() to make a list whose elements are square of even number in [1,2,3,4,5,6,7,8,9,10].

Code

def even(x):
    return x % 2 == 0


def squer(x):
    return x * x

li = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
li = map(
    squer, filter(even, li)
)  # first filters number by even number and the apply map() on the resultant elements
print(list(li))

ChatGPT Explanation

The code defines two functions: even(x) and square(x). The even function takes a single argument x and returns True if x is even and False otherwise. The square function takes a single argument x and returns x squared.

Then it creates a list of numbers called li. It then uses the map() function to apply the square function to each element in the list. But before applying the square function, it applies the filter function to the list, which filters out all the elements that are not even.

So the final output will be the square of even numbers of the list.