Answer to Question #296013 in Python for Michael

Question

While taking a viva in class, the teacher decides to take the viva of two roll numbers at a time. For this she calls out the roll numbers from the list of roll numbers as: One roll number from the first n^th roll number and Second roll number from the n^th last roll number. For example if the numbers are: rollnum=[21, 24, 45, 6, 7, 23, 9, 11, 15, 18], and n=4, then :One roll number called for viva is 6 and second roll number called for viva is 9.

You need to write a python function which take a list A and n^th roll number as input and return first n^th roll number and Second roll number from the n^th last roll number as shown in example. If n^th roll number is not lies in the range of list, then function will return "n is not in range" in place of first roll number and empty string (“”) in place of second roll number.

 

Example-1

Example-2

Input:

[21, 24, 45, 6, 7, 23, 9, 11, 15, 18]

20

 

Output:

n is not in range

Input:

[21, 24, 45, 6, 7, 23, 9, 11, 15, 18]

5

 

Output:

7

23

Answer 1

def roll_nums(lst, n):
	if n > len(lst) or n < 1:
		return "n is not in range", ""
	else:
		return lst[n-1], lst[-n]


rollnum = [21, 24, 45, 6, 7, 23, 9, 11, 15, 18]
n=5
print(*roll_nums(rollnum, n),sep="\n")