Map and Lambda Function — HackerRank Problem Solution in Python3

Map and Lambda Function — HackerRank Problem Solution in Python3
Problem -

Let’s learn some new Python concepts! You have to generate a list of the first fibonacci numbers,

being the first number. Then, apply the map function and a lambda expression to cube each fibonacci number and print the list.

Concept

The map() function applies a function to every member of an iterable and returns the result. It takes two parameters: first, the function that is to be applied and secondly, the iterables.
Let's say you are given a list of names, and you have to print a list that contains the length of each name.

print (list(map(len, ['Tina', 'Raj', 'Tom'])))

[4, 3, 3]

Lambda is a single expression anonymous function often used as an inline function. In simple words, it is a function that has only one line in its body. It proves very handy in functional and GUI programming.

sum = lambda a, b, c: a + b + c
sum(1, 2, 3)
6

Note:

Lambda functions cannot use the return statement and can only have a single expression. Unlike def, which creates a function and assigns it a name, lambda creates a function and returns the function itself. Lambda can be used inside lists and dictionaries.

Input Format

One line of input: an integer

.

Constraints

Output Format

A list on a single line containing the cubes of the first

fibonacci numbers.

Sample Input

5

Sample Output

[0, 1, 1, 8, 27]

Solution -

cube = lambda x: x*x*x # complete the lambda function

def fibonacci(n):
def fibonaccii(n):
if n == 1 or n == 2:
return 1
elif n == 0:
return 0
else:
return(fibonaccii(n-1) + fibonaccii(n-2))
l = []

for i in range(n):
    ans = (fibonaccii(i))
    l.append(ans)


return l

# return a list of fibonacci numbers

if name == 'main':
n = int(input())
print(list(map(cube, fibonacci(n))))