Exercise 13: map() function

Python Map Exercises

Let’s check out some exercises that will help understand map() better.

Exercise 13-a

Write a map function that adds plus 5 to each item in the list.

map() function takes two arguments, first the function, then comma and second the name of the list to be used for the mapping function.

Hint 2

lambda x: x+5 will take x as input and return x+5 as output.

Solution

lst2 = list(map(lambda x: x+5, lst1))

Exercise 13-b

Write a map function that returns the squares of the items in the list.

Hint 1

map() function takes two arguments, first the function, then comma and second the name of the list to be used for the mapping function.

Hint 2

lambda x: x**2 will take x as input and return x**2 as output.

Solution

lst2 = list(map(lambda x: x**2, lst1))

Exercise 13-c

Write a map function that adds "Hello, " in front of each item in the list.

Hint 1

map() function takes two arguments, first the function, then comma and second the name of the list to be used for the mapping function.

Hint 2

lambda x: “Hello, ” + x will take x as input and return “Hello, x” as output.

Solution

lst2 = list(map(lambda x: "Hello, " + x, lst1))

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